一、日志工具类 Log.java
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public class L { private L() { /* 不可被实例化 */throw new UnsupportedOperationException("Cannot be instantiated!"); } // 是否需要打印bug，可以在application的onCreate函数里面初始化 public static boolean isDebug = true; private static final String TAG = "DefaultTag"; // 下面四个是默认tag的函数 public static void i(String msg) { if (isDebug) Log.i(TAG, msg); } public static void d(String msg) { if (isDebug) Log.d(TAG, msg); } public static void e(String msg) { if (isDebug) Log.e(TAG, msg); } public static void v(String msg) { if (isDebug) Log.v(TAG, msg); } // 下面是传入自定义tag的函数 public static void i(String tag, String msg) { if (isDebug) Log.i(tag, msg); } public static void d(String tag, String msg) { if (isDebug) Log.i(tag, msg); } public static void e(String tag, String msg) { if (isDebug) Log.i(tag, msg); } public static void v(String tag, String msg) { if (isDebug) Log.i(tag, msg); } } |
二、Toast统一管理类 Tost.java
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public class T { private T() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } public static boolean isShow = true; /** * 短时间显示Toast */ public static void showShort(Context context, CharSequence message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_SHORT).show(); } /** * 短时间显示Toast * @param message 要显示的字符串资源的id*/ public static void showShort(Context context, int message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_SHORT).show(); } /** * 长时间显示Toast */ public static void showLong(Context context, CharSequence message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_LONG).show(); } /** * 长时间显示Toast */ public static void showLong(Context context, int message) { if (isShow) Toast.makeText(context, message, Toast.LENGTH_LONG).show(); } /** * 自定义显示Toast时间 */ public static void show(Context context, CharSequence message, int duration) { if (isShow) Toast.makeText(context, message, duration).show(); } /** * 自定义显示Toast时间 */public static void show(Context context, int message, int duration) { if (isShow) Toast.makeText(context, message, duration).show(); } } |
三、SharedPreferences封装类 SPUtils.java 和 PreferencesUtils.java
1. SPUtils.java
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public class SPUtils { /** * 保存在手机里面的文件名 */public static final String FILE_NAME = "share_data"; /** * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法 * * @param context * @param key * @param object */public static void put(Context context, String key, Object object) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); if (object instanceof String) { editor.putString(key, (String) object); } else if (object instanceof Integer) { editor.putInt(key, (Integer) object); } else if (object instanceof Boolean) { editor.putBoolean(key, (Boolean) object); } else if (object instanceof Float) { editor.putFloat(key, (Float) object); } else if (object instanceof Long) { editor.putLong(key, (Long) object); } else{ editor.putString(key, object.toString()); } SharedPreferencesCompat.apply(editor); } /** * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值 * * @param context * @param key * @param defaultObject * @return */public static Object get(Context context, String key, Object defaultObject) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); if (defaultObject instanceof String) { return sp.getString(key, (String) defaultObject); } else if (defaultObject instanceof Integer) { return sp.getInt(key, (Integer) defaultObject); } else if (defaultObject instanceof Boolean) { return sp.getBoolean(key, (Boolean) defaultObject); } else if (defaultObject instanceof Float) { return sp.getFloat(key, (Float) defaultObject); } else if (defaultObject instanceof Long) { return sp.getLong(key, (Long) defaultObject); } return null; } /** * 移除某个key值已经对应的值 * @param context * @param key */public static void remove(Context context, String key) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.remove(key); SharedPreferencesCompat.apply(editor); } /** * 清除所有数据 * @param context */public static void clear(Context context) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.clear(); SharedPreferencesCompat.apply(editor); } /** * 查询某个key是否已经存在 * @param context * @param key * @return */public static boolean contains(Context context, String key) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.contains(key); } /** * 返回所有的键值对 * * @param context * @return */public static Map<String, ?> getAll(Context context) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.getAll(); } /** * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类 * * @author zhy * */private static class SharedPreferencesCompat { private static final Method sApplyMethod = findApplyMethod(); /** * 反射查找apply的方法 * * @return */@SuppressWarnings({ "unchecked", "rawtypes" }) private static Method findApplyMethod() { try{ Class clz = SharedPreferences.Editor.class; return clz.getMethod("apply"); } catch (NoSuchMethodException e) { } return null; } /** * 如果找到则使用apply执行，否则使用commit * * @param editor */public static void apply(SharedPreferences.Editor editor) { try{ if (sApplyMethod != null) { sApplyMethod.invoke(editor); return; } } catch (IllegalArgumentException e) { } catch (IllegalAccessException e) { } catch (InvocationTargetException e) { } editor.commit(); } } } |
对SharedPreference的使用做了建议的封装，对外公布出put，get，remove，clear等等方法；
注意一点，里面所有的commit操作使用了SharedPreferencesCompat.apply进行了替代，目的是尽可能的使用apply代替commit.
首先说下为什么，因为commit方法是同步的，并且我们很多时候的commit操作都是UI线程中，毕竟是IO操作，尽可能异步；
所以我们使用apply进行替代，apply异步的进行写入；
但是apply相当于commit来说是new API呢，为了更好的兼容，我们做了适配；
SharedPreferencesCompat也可以给大家创建兼容类提供了一定的参考
2. SPUtils.java
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public class PreferencesUtils {public static String PREFERENCE_NAME = "TrineaAndroidCommon";private PreferencesUtils() {throw new AssertionError();}/*** put string preferences* * @param context* @param key The name of the preference to modify* @param value The new value for the preference* @return True if the new values were successfully written to persistent storage.*/public static boolean putString(Context context, String key, String value) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);SharedPreferences.Editor editor = settings.edit();editor.putString(key, value);return editor.commit();}/*** get string preferences* * @param context* @param key The name of the preference to retrieve* @return The preference value if it exists, or null. Throws ClassCastException if there is a preference with this* name that is not a string* @see #getString(Context, String, String)*/public static String getString(Context context, String key) {return getString(context, key, null);}/*** get string preferences* * @param context* @param key The name of the preference to retrieve* @param defaultValue Value to return if this preference does not exist* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with* this name that is not a string*/public static String getString(Context context, String key, String defaultValue) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);return settings.getString(key, defaultValue);}/*** put int preferences* * @param context* @param key The name of the preference to modify* @param value The new value for the preference* @return True if the new values were successfully written to persistent storage.*/public static boolean putInt(Context context, String key, int value) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);SharedPreferences.Editor editor = settings.edit();editor.putInt(key, value);return editor.commit();}/*** get int preferences* * @param context* @param key The name of the preference to retrieve* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this* name that is not a int* @see #getInt(Context, String, int)*/public static int getInt(Context context, String key) {return getInt(context, key, -);}/*** get int preferences* * @param context* @param key The name of the preference to retrieve* @param defaultValue Value to return if this preference does not exist* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with* this name that is not a int*/public static int getInt(Context context, String key, int defaultValue) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);return settings.getInt(key, defaultValue);}/*** put long preferences* * @param context* @param key The name of the preference to modify* @param value The new value for the preference* @return True if the new values were successfully written to persistent storage.*/public static boolean putLong(Context context, String key, long value) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);SharedPreferences.Editor editor = settings.edit();editor.putLong(key, value);return editor.commit();}/*** get long preferences* * @param context* @param key The name of the preference to retrieve* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this* name that is not a long* @see #getLong(Context, String, long)*/public static long getLong(Context context, String key) {return getLong(context, key, -);}/*** get long preferences* * @param context* @param key The name of the preference to retrieve* @param defaultValue Value to return if this preference does not exist* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with* this name that is not a long*/public static long getLong(Context context, String key, long defaultValue) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);return settings.getLong(key, defaultValue);}/*** put float preferences* * @param context* @param key The name of the preference to modify* @param value The new value for the preference* @return True if the new values were successfully written to persistent storage.*/public static boolean putFloat(Context context, String key, float value) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);SharedPreferences.Editor editor = settings.edit();editor.putFloat(key, value);return editor.commit();}/*** get float preferences* * @param context* @param key The name of the preference to retrieve* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this* name that is not a float* @see #getFloat(Context, String, float)*/public static float getFloat(Context context, String key) {return getFloat(context, key, -);}/*** get float preferences* * @param context* @param key The name of the preference to retrieve* @param defaultValue Value to return if this preference does not exist* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with* this name that is not a float*/public static float getFloat(Context context, String key, float defaultValue) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);return settings.getFloat(key, defaultValue);}/*** put boolean preferences* * @param context* @param key The name of the preference to modify* @param value The new value for the preference* @return True if the new values were successfully written to persistent storage.*/public static boolean putBoolean(Context context, String key, boolean value) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);SharedPreferences.Editor editor = settings.edit();editor.putBoolean(key, value);return editor.commit();}/*** get boolean preferences, default is false* * @param context* @param key The name of the preference to retrieve* @return The preference value if it exists, or false. Throws ClassCastException if there is a preference with this* name that is not a boolean* @see #getBoolean(Context, String, boolean)*/public static boolean getBoolean(Context context, String key) {return getBoolean(context, key, false);}/*** get boolean preferences* * @param context* @param key The name of the preference to retrieve* @param defaultValue Value to return if this preference does not exist* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with* this name that is not a boolean*/public static boolean getBoolean(Context context, String key, boolean defaultValue) {SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);return settings.getBoolean(key, defaultValue);}} |
四、单位转换类 DensityUtils.java
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public class DensityUtils { private DensityUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * dp转px * * @param context * @param val * @return */ public static int dppx(Context context, float dpVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, context.getResources().getDisplayMetrics()); } /** * sp转px * * @param context * @param val * @return */ public static int sppx(Context context, float spVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, context.getResources().getDisplayMetrics()); } /** * px转dp * * @param context * @param pxVal * @return */ public static float pxdp(Context context, float pxVal) { final float scale = context.getResources().getDisplayMetrics().density; return (pxVal / scale); } /** * px转sp * * @param fontScale * @param pxVal * @return */public static float pxsp(Context context, float pxVal) { return (pxVal / context.getResources().getDisplayMetrics().scaledDensity); } } |
TypedValue：
Container for a dynamically typed data value. Primarily used with Resources for holding resource values.
applyDimension(int unit, float value, DisplayMetrics metrics)：
Converts an unpacked complex data value holding a dimension to its final floating point value.
五、SD卡相关辅助类 SDCardUtils.java
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public class SDCardUtils { private SDCardUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 判断SDCard是否可用 * * @return */ public static boolean isSDCardEnable() { return Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED); } /** * 获取SD卡路径 * * @return */ public static String getSDCardPath() { return Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator; } /** * 获取SD卡的剩余容量 单位byte * * @return */ public static long getSDCardAllSize() { if (isSDCardEnable()) { StatFs stat = new StatFs(getSDCardPath()); // 获取空闲的数据块的数量 long availableBlocks = (long) stat.getAvailableBlocks() - ; // 获取单个数据块的大小（byte） long freeBlocks = stat.getAvailableBlocks(); return freeBlocks * availableBlocks; } return ; } /** * 获取指定路径所在空间的剩余可用容量字节数，单位byte * * @param filePath * @return 容量字节 SDCard可用空间，内部存储可用空间 */ public static long getFreeBytes(String filePath) { // 如果是sd卡的下的路径，则获取sd卡可用容量 if (filePath.startsWith(getSDCardPath())) { filePath = getSDCardPath(); } else {// 如果是内部存储的路径，则获取内存存储的可用容量 filePath = Environment.getDataDirectory().getAbsolutePath(); } StatFs stat = new StatFs(filePath); long availableBlocks = (long) stat.getAvailableBlocks() - ; return stat.getBlockSize() * availableBlocks; } /** * 获取系统存储路径 * * @return */public static String getRootDirectoryPath() { return Environment.getRootDirectory().getAbsolutePath(); } } |
StatFs 是Android提供的一个类：
Retrieve overall information about the space on a filesystem. This is a wrapper for Unix statvfs().
检索一个文件系统的整体信息空间。这是一个Unix statvfs() 包装器
六、屏幕相关辅助类 ScreenUtils.java
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public class ScreenUtils { private ScreenUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 获得屏幕高度 * * @param context * @return */ public static int getScreenWidth(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); return outMetrics.widthPixels; } /** * 获得屏幕宽度 * * @param context * @return */ public static int getScreenHeight(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); return outMetrics.heightPixels; } /** * 获得状态栏的高度 * * @param context * @return */ public static int getStatusHeight(Context context) { int statusHeight = -; try { Class<?> clazz = Class.forName("com.android.internal.R$dimen"); Object object = clazz.newInstance(); int height = Integer.parseInt(clazz.getField("status_bar_height") .get(object).toString()); statusHeight = context.getResources().getDimensionPixelSize(height); } catch (Exception e) { e.printStackTrace(); } return statusHeight; } /** * 获取当前屏幕截图，包含状态栏 * * @param activity * @return */ public static Bitmap snapShotWithStatusBar(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bmp = view.getDrawingCache(); int width = getScreenWidth(activity); int height = getScreenHeight(activity); Bitmap bp = null; bp = Bitmap.createBitmap(bmp, , , width, height); view.destroyDrawingCache(); return bp; } /** * 获取当前屏幕截图，不包含状态栏 * * @param activity * @return */public static Bitmap snapShotWithoutStatusBar(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bmp = view.getDrawingCache(); Rect frame = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top; int width = getScreenWidth(activity); int height = getScreenHeight(activity); Bitmap bp = null; bp = Bitmap.createBitmap(bmp, , statusBarHeight, width, height - statusBarHeight); view.destroyDrawingCache(); return bp; } } |
七、App相关辅助类 APPUtils.java
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public class AppUtils { private AppUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 获取应用程序名称 */ public static String getAppName(Context context) { try { PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo( context.getPackageName(), ); int labelRes = packageInfo.applicationInfo.labelRes; return context.getResources().getString(labelRes); } catch (NameNotFoundException e) { e.printStackTrace(); } return null; } /** * [获取应用程序版本名称信息] * * @param context * @return 当前应用的版本名称 */public static String getVersionName(Context context) { try{ PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo( context.getPackageName(), ); return packageInfo.versionName; } catch (NameNotFoundException e) { e.printStackTrace(); } return null; } } |
八、软键盘相关辅助类KeyBoardUtils.java
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/** * 打开或关闭软键盘 */public class KeyBoardUtils { /** * 打卡软键盘 * * @param mEditText 输入框 * @param mContext 上下文 */public static void openKeybord(EditText mEditText, Context mContext) { InputMethodManager imm = (InputMethodManager) mContext .getSystemService(Context.INPUT_METHOD_SERVICE); imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN); imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY); } /** * 关闭软键盘 * * @param mEditText 输入框 * @param mContext 上下文 */public static void closeKeybord(EditText mEditText, Context mContext) { InputMethodManager imm = (InputMethodManager) mContext .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(mEditText.getWindowToken(), ); } } |
九、网络相关辅助类 NetUtils.java
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public class NetUtils { private NetUtils() { /* cannot be instantiated */ throw new UnsupportedOperationException("cannot be instantiated"); } /** * 判断网络是否连接 */ public static boolean isConnected(Context context) { ConnectivityManager connectivity = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (null != connectivity) { NetworkInfo info = connectivity.getActiveNetworkInfo(); if (null != info && info.isConnected()) { if (info.getState() == NetworkInfo.State.CONNECTED) { return true; } } } return false; } /** * 判断是否是wifi连接 */ public static boolean isWifi(Context context) { ConnectivityManager cm = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (cm == null) return false; return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI; } /** * 打开网络设置界面 */public static void openSetting(Activity activity) { Intent intent = new Intent("/"); ComponentName cm = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings"); intent.setComponent(cm); intent.setAction("android.intent.action.VIEW"); activity.startActivityForResult(intent, ); } } |
十、Http相关辅助类 HttpUtils.java
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/** * Http请求的工具类 */public class HttpUtils { private static final int TIMEOUT_IN_MILLIONS = ; public interface CallBack { void onRequestComplete(String result); } /** * 异步的Get请求 * * @param urlStr * @param callBack */public static void doGetAsyn(final String urlStr, final CallBack callBack) { new Thread() { public void run() { try{ String result = doGet(urlStr); if (callBack != null) { callBack.onRequestComplete(result); } } catch (Exception e) { e.printStackTrace(); } }; }.start(); } /** * 异步的Post请求 * @param urlStr * @param params * @param callBack * @throws Exception */public static void doPostAsyn(final String urlStr, final String params, final CallBack callBack) throws Exception { new Thread() { public void run() { try{ String result = doPost(urlStr, params); if (callBack != null) { callBack.onRequestComplete(result); } } catch (Exception e) { e.printStackTrace(); } }; }.start(); } /** * Get请求，获得返回数据 * * @param urlStr * @return * @throws Exception */public static String doGet(String urlStr) { URL url = null; HttpURLConnection conn = null; InputStream is = null; ByteArrayOutputStream baos = null; try{ url = new URL(urlStr); conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(TIMEOUT_IN_MILLIONS); conn.setConnectTimeout(TIMEOUT_IN_MILLIONS); conn.setRequestMethod("GET"); conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); if (conn.getResponseCode() == ) { is = conn.getInputStream(); baos = new ByteArrayOutputStream(); int len = -; byte[] buf = new byte[]; while ((len = is.read(buf)) != -) { baos.write(buf, , len); } baos.flush(); return baos.toString(); } else{ throw new RuntimeException(" responseCode is not ... "); } } catch (Exception e) { e.printStackTrace(); } finally{ try{ if (is != null) is.close(); } catch (IOException e) { } try{ if (baos != null) baos.close(); } catch (IOException e) { } conn.disconnect(); } return null ; } /** * 向指定 URL 发送POST方法的请求 * * @param url * 发送请求的 URL * @param param * 请求参数，请求参数应该是 name=value&name=value 的形式。 * @return 所代表远程资源的响应结果 * @throws Exception */public static String doPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try{ URL realUrl = new URL(url); // 打开和URL之间的连接 HttpURLConnection conn = (HttpURLConnection) realUrl .openConnection(); // 设置通用的请求属性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("charset", "utf-"); conn.setUseCaches(false); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); conn.setReadTimeout(TIMEOUT_IN_MILLIONS); conn.setConnectTimeout(TIMEOUT_IN_MILLIONS); if (param != null && !param.trim().equals("")) { // 获取URLConnection对象对应的输出流 out = new PrintWriter(conn.getOutputStream()); // 发送请求参数 out.print(param); // flush输出流的缓冲 out.flush(); } // 定义BufferedReader输入流来读取URL的响应 in = new BufferedReader( new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { e.printStackTrace(); } // 使用finally块来关闭输出流、输入流 finally{ try{ if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; } } |
十一、时间工具类 TimeUtils.java
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public class TimeUtils {public static final SimpleDateFormat DEFAULT_DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");public static final SimpleDateFormat DATE_FORMAT_DATE = new SimpleDateFormat("yyyy-MM-dd");private TimeUtils() {throw new AssertionError();}/*** long time to string* * @param timeInMillis* @param dateFormat* @return*/public static String getTime(long timeInMillis, SimpleDateFormat dateFormat) {return dateFormat.format(new Date(timeInMillis));}/*** long time to string, format is {@link #DEFAULT_DATE_FORMAT}* * @param timeInMillis* @return*/public static String getTime(long timeInMillis) {return getTime(timeInMillis, DEFAULT_DATE_FORMAT);}/*** get current time in milliseconds* * @return*/public static long getCurrentTimeInLong() {return System.currentTimeMillis();}/*** get current time in milliseconds, format is {@link #DEFAULT_DATE_FORMAT}* * @return*/public static String getCurrentTimeInString() {return getTime(getCurrentTimeInLong());}/*** get current time in milliseconds* * @return*/public static String getCurrentTimeInString(SimpleDateFormat dateFormat) {return getTime(getCurrentTimeInLong(), dateFormat);}} |
十二、文件工具类 FileUtils.java
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public class FileUtils {public final static String FILE_EXTENSION_SEPARATOR = ".";private FileUtils() {throw new AssertionError();}/*** read file* * @param filePath* @param charsetName The name of a supported {@link java.nio.charset.Charset </code>charset<code>}* @return if file not exist, return null, else return content of file* @throws RuntimeException if an error occurs while operator BufferedReader*/public static StringBuilder readFile(String filePath, String charsetName) {File file = new File(filePath);StringBuilder fileContent = new StringBuilder("");if (file == null || !file.isFile()) {return null;}BufferedReader reader = null;try {InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);reader = new BufferedReader(is);String line = null;while ((line = reader.readLine()) != null) {if (!fileContent.toString().equals("")) {fileContent.append("\r\n");}fileContent.append(line);}return fileContent;} catch (IOException e) {throw new RuntimeException("IOException occurred. ", e);} finally {IOUtils.close(reader);}}/*** write file* * @param filePath* @param content* @param append is append, if true, write to the end of file, else clear content of file and write into it* @return return false if content is empty, true otherwise* @throws RuntimeException if an error occurs while operator FileWriter*/public static boolean writeFile(String filePath, String content, boolean append) {if (StringUtils.isEmpty(content)) {return false;}FileWriter fileWriter = null;try {makeDirs(filePath);fileWriter = new FileWriter(filePath, append);fileWriter.write(content);return true;} catch (IOException e) {throw new RuntimeException("IOException occurred. ", e);} finally {IOUtils.close(fileWriter);}}/*** write file* * @param filePath* @param contentList* @param append is append, if true, write to the end of file, else clear content of file and write into it* @return return false if contentList is empty, true otherwise* @throws RuntimeException if an error occurs while operator FileWriter*/public static boolean writeFile(String filePath, List<String> contentList, boolean append) {if (ListUtils.isEmpty(contentList)) {return false;}FileWriter fileWriter = null;try {makeDirs(filePath);fileWriter = new FileWriter(filePath, append);int i = ;for (String line : contentList) {if (i++ > ) {fileWriter.write("\r\n");}fileWriter.write(line);}return true;} catch (IOException e) {throw new RuntimeException("IOException occurred. ", e);} finally {IOUtils.close(fileWriter);}}/*** write file, the string will be written to the begin of the file* * @param filePath* @param content* @return*/public static boolean writeFile(String filePath, String content) {return writeFile(filePath, content, false);}/*** write file, the string list will be written to the begin of the file* * @param filePath* @param contentList* @return*/public static boolean writeFile(String filePath, List<String> contentList) {return writeFile(filePath, contentList, false);}/*** write file, the bytes will be written to the begin of the file* * @param filePath* @param stream* @return* @see {@link #writeFile(String, InputStream, boolean)}*/public static boolean writeFile(String filePath, InputStream stream) {return writeFile(filePath, stream, false);}/*** write file* * @param file the file to be opened for writing.* @param stream the input stream* @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning* @return return true* @throws RuntimeException if an error occurs while operator FileOutputStream*/public static boolean writeFile(String filePath, InputStream stream, boolean append) {return writeFile(filePath != null ? new File(filePath) : null, stream, append);}/*** write file, the bytes will be written to the begin of the file* * @param file* @param stream* @return* @see {@link #writeFile(File, InputStream, boolean)}*/public static boolean writeFile(File file, InputStream stream) {return writeFile(file, stream, false);}/*** write file* * @param file the file to be opened for writing.* @param stream the input stream* @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning* @return return true* @throws RuntimeException if an error occurs while operator FileOutputStream*/public static boolean writeFile(File file, InputStream stream, boolean append) {OutputStream o = null;try {makeDirs(file.getAbsolutePath());o = new FileOutputStream(file, append);byte data[] = new byte[];int length = -;while ((length = stream.read(data)) != -) {o.write(data, , length);}o.flush();return true;} catch (FileNotFoundException e) {throw new RuntimeException("FileNotFoundException occurred. ", e);} catch (IOException e) {throw new RuntimeException("IOException occurred. ", e);} finally {IOUtils.close(o);IOUtils.close(stream);}}/*** move file* * @param sourceFilePath* @param destFilePath*/public static void moveFile(String sourceFilePath, String destFilePath) {if (TextUtils.isEmpty(sourceFilePath) || TextUtils.isEmpty(destFilePath)) {throw new RuntimeException("Both sourceFilePath and destFilePath cannot be null.");}moveFile(new File(sourceFilePath), new File(destFilePath));}/*** move file* * @param srcFile* @param destFile*/public static void moveFile(File srcFile, File destFile) {boolean rename = srcFile.renameTo(destFile);if (!rename) {copyFile(srcFile.getAbsolutePath(), destFile.getAbsolutePath());deleteFile(srcFile.getAbsolutePath());}}/*** copy file* * @param sourceFilePath* @param destFilePath* @return* @throws RuntimeException if an error occurs while operator FileOutputStream*/public static boolean copyFile(String sourceFilePath, String destFilePath) {InputStream inputStream = null;try {inputStream = new FileInputStream(sourceFilePath);} catch (FileNotFoundException e) {throw new RuntimeException("FileNotFoundException occurred. ", e);}return writeFile(destFilePath, inputStream);}/*** read file to string list, a element of list is a line* * @param filePath* @param charsetName The name of a supported {@link java.nio.charset.Charset </code>charset<code>}* @return if file not exist, return null, else return content of file* @throws RuntimeException if an error occurs while operator BufferedReader*/public static List<String> readFileToList(String filePath, String charsetName) {File file = new File(filePath);List<String> fileContent = new ArrayList<String>();if (file == null || !file.isFile()) {return null;}BufferedReader reader = null;try {InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);reader = new BufferedReader(is);String line = null;while ((line = reader.readLine()) != null) {fileContent.add(line);}return fileContent;} catch (IOException e) {throw new RuntimeException("IOException occurred. ", e);} finally {IOUtils.close(reader);}}/*** get file name from path, not include suffix* * <pre>* getFileNameWithoutExtension(null) = null* getFileNameWithoutExtension("") = ""* getFileNameWithoutExtension(" ") = " "* getFileNameWithoutExtension("abc") = "abc"* getFileNameWithoutExtension("a.mp") = "a"* getFileNameWithoutExtension("a.b.rmvb") = "a.b"* getFileNameWithoutExtension("c:\\") = ""* getFileNameWithoutExtension("c:\\a") = "a"* getFileNameWithoutExtension("c:\\a.b") = "a"* getFileNameWithoutExtension("c:a.txt\\a") = "a"* getFileNameWithoutExtension("/home/admin") = "admin"* getFileNameWithoutExtension("/home/admin/a.txt/b.mp") = "b"* </pre>* * @param filePath* @return file name from path, not include suffix* @see*/public static String getFileNameWithoutExtension(String filePath) {if (StringUtils.isEmpty(filePath)) {return filePath;}int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);int filePosi = filePath.lastIndexOf(File.separator);if (filePosi == -) {return (extenPosi == - ? filePath : filePath.substring(, extenPosi));}if (extenPosi == -) {return filePath.substring(filePosi + );}return (filePosi < extenPosi ? filePath.substring(filePosi + , extenPosi) : filePath.substring(filePosi + ));}/*** get file name from path, include suffix* * <pre>* getFileName(null) = null* getFileName("") = ""* getFileName(" ") = " "* getFileName("a.mp") = "a.mp"* getFileName("a.b.rmvb") = "a.b.rmvb"* getFileName("abc") = "abc"* getFileName("c:\\") = ""* getFileName("c:\\a") = "a"* getFileName("c:\\a.b") = "a.b"* getFileName("c:a.txt\\a") = "a"* getFileName("/home/admin") = "admin"* getFileName("/home/admin/a.txt/b.mp") = "b.mp"* </pre>* * @param filePath* @return file name from path, include suffix*/public static String getFileName(String filePath) {if (StringUtils.isEmpty(filePath)) {return filePath;}int filePosi = filePath.lastIndexOf(File.separator);return (filePosi == -) ? filePath : filePath.substring(filePosi + );}/*** get folder name from path* * <pre>* getFolderName(null) = null* getFolderName("") = ""* getFolderName(" ") = ""* getFolderName("a.mp") = ""* getFolderName("a.b.rmvb") = ""* getFolderName("abc") = ""* getFolderName("c:\\") = "c:"* getFolderName("c:\\a") = "c:"* getFolderName("c:\\a.b") = "c:"* getFolderName("c:a.txt\\a") = "c:a.txt"* getFolderName("c:a\\b\\c\\d.txt") = "c:a\\b\\c"* getFolderName("/home/admin") = "/home"* getFolderName("/home/admin/a.txt/b.mp") = "/home/admin/a.txt"* </pre>* * @param filePath* @return*/public static String getFolderName(String filePath) {if (StringUtils.isEmpty(filePath)) {return filePath;}int filePosi = filePath.lastIndexOf(File.separator);return (filePosi == -) ? "" : filePath.substring(, filePosi);}/*** get suffix of file from path* * <pre>* getFileExtension(null) = ""* getFileExtension("") = ""* getFileExtension(" ") = " "* getFileExtension("a.mp") = "mp"* getFileExtension("a.b.rmvb") = "rmvb"* getFileExtension("abc") = ""* getFileExtension("c:\\") = ""* getFileExtension("c:\\a") = ""* getFileExtension("c:\\a.b") = "b"* getFileExtension("c:a.txt\\a") = ""* getFileExtension("/home/admin") = ""* getFileExtension("/home/admin/a.txt/b") = ""* getFileExtension("/home/admin/a.txt/b.mp") = "mp"* </pre>* * @param filePath* @return*/public static String getFileExtension(String filePath) {if (StringUtils.isBlank(filePath)) {return filePath;}int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);int filePosi = filePath.lastIndexOf(File.separator);if (extenPosi == -) {return "";}return (filePosi >= extenPosi) ? "" : filePath.substring(extenPosi + );}/*** Creates the directory named by the trailing filename of this file, including the complete directory path required* to create this directory. <br/>* <br/>* <ul>* <strong>Attentions:</strong>* <li>makeDirs("C:\\Users\\Trinea") can only create users folder</li>* <li>makeFolder("C:\\Users\\Trinea\\") can create Trinea folder</li>* </ul>* * @param filePath* @return true if the necessary directories have been created or the target directory already exists, false one of* the directories can not be created.* <ul>* <li>if {@link FileUtils#getFolderName(String)} return null, return false</li>* <li>if target directory already exists, return true</li>* <li>return {@link java.io.File#makeFolder}</li>* </ul>*/public static boolean makeDirs(String filePath) {String folderName = getFolderName(filePath);if (StringUtils.isEmpty(folderName)) {return false;}File folder = new File(folderName);return (folder.exists() && folder.isDirectory()) ? true : folder.mkdirs();}/*** @param filePath* @return* @see #makeDirs(String)*/public static boolean makeFolders(String filePath) {return makeDirs(filePath);}/*** Indicates if this file represents a file on the underlying file system.* * @param filePath* @return*/public static boolean isFileExist(String filePath) {if (StringUtils.isBlank(filePath)) {return false;}File file = new File(filePath);return (file.exists() && file.isFile());}/*** Indicates if this file represents a directory on the underlying file system.* * @param directoryPath* @return*/public static boolean isFolderExist(String directoryPath) {if (StringUtils.isBlank(directoryPath)) {return false;}File dire = new File(directoryPath);return (dire.exists() && dire.isDirectory());}/*** delete file or directory* <ul>* <li>if path is null or empty, return true</li>* <li>if path not exist, return true</li>* <li>if path exist, delete recursion. return true</li>* <ul>* * @param path* @return*/public static boolean deleteFile(String path) {if (StringUtils.isBlank(path)) {return true;}File file = new File(path);if (!file.exists()) {return true;}if (file.isFile()) {return file.delete();}if (!file.isDirectory()) {return false;}for (File f : file.listFiles()) {if (f.isFile()) {f.delete();} else if (f.isDirectory()) {deleteFile(f.getAbsolutePath());}}return file.delete();}/*** get file size* <ul>* <li>if path is null or empty, return -</li>* <li>if path exist and it is a file, return file size, else return -</li>* <ul>* * @param path* @return returns the length of this file in bytes. returns - if the file does not exist.*/public static long getFileSize(String path) {if (StringUtils.isBlank(path)) {return -;}File file = new File(path);return (file.exists() && file.isFile() ? file.length() : -);}} |
十三、assets和raw资源工具类 ResourceUtils.java
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public class ResourceUtils {private ResourceUtils() {throw new AssertionError();}/*** get an asset using ACCESS_STREAMING mode. This provides access to files that have been bundled with an* application as assets -- that is, files placed in to the "assets" directory.* * @param context* @param fileName The name of the asset to open. This name can be hierarchical.* @return*/public static String geFileFromAssets(Context context, String fileName) {if (context == null || StringUtils.isEmpty(fileName)) {return null;}StringBuilder s = new StringBuilder("");try {InputStreamReader in = new InputStreamReader(context.getResources().getAssets().open(fileName));BufferedReader br = new BufferedReader(in);String line;while ((line = br.readLine()) != null) {s.append(line);}return s.toString();} catch (IOException e) {e.printStackTrace();return null;}}/*** get content from a raw resource. This can only be used with resources whose value is the name of an asset files* -- that is, it can be used to open drawable, sound, and raw resources; it will fail on string and color* resources.* * @param context* @param resId The resource identifier to open, as generated by the appt tool.* @return*/public static String geFileFromRaw(Context context, int resId) {if (context == null) {return null;}StringBuilder s = new StringBuilder();try {InputStreamReader in = new InputStreamReader(context.getResources().openRawResource(resId));BufferedReader br = new BufferedReader(in);String line;while ((line = br.readLine()) != null) {s.append(line);}return s.toString();} catch (IOException e) {e.printStackTrace();return null;}}/*** same to {@link ResourceUtils#geFileFromAssets(Context, String)}, but return type is List<String>* * @param context* @param fileName* @return*/public static List<String> geFileToListFromAssets(Context context, String fileName) {if (context == null || StringUtils.isEmpty(fileName)) {return null;}List<String> fileContent = new ArrayList<String>();try {InputStreamReader in = new InputStreamReader(context.getResources().getAssets().open(fileName));BufferedReader br = new BufferedReader(in);String line;while ((line = br.readLine()) != null) {fileContent.add(line);}br.close();return fileContent;} catch (IOException e) {e.printStackTrace();return null;}}/*** same to {@link ResourceUtils#geFileFromRaw(Context, int)}, but return type is List<String>* * @param context* @param resId* @return*/public static List<String> geFileToListFromRaw(Context context, int resId) {if (context == null) {return null;}List<String> fileContent = new ArrayList<String>();BufferedReader reader = null;try {InputStreamReader in = new InputStreamReader(context.getResources().openRawResource(resId));reader = new BufferedReader(in);String line = null;while ((line = reader.readLine()) != null) {fileContent.add(line);}reader.close();return fileContent;} catch (IOException e) {e.printStackTrace();return null;}}} |
十四、单例工具类 SingletonUtils.java
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public abstract class SingletonUtils<T> {private T instance;protected abstract T newInstance();public final T getInstance() {if (instance == null) {synchronized (SingletonUtils.class) {if (instance == null) {instance = newInstance();}}}return instance;}} |
十五、数据库工具类 SqliteUtils.java
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public class SqliteUtils {private static volatile SqliteUtils instance;private DbHelper dbHelper;private SQLiteDatabase db;private SqliteUtils(Context context) {dbHelper = new DbHelper(context);db = dbHelper.getWritableDatabase();}public static SqliteUtils getInstance(Context context) {if (instance == null) {synchronized (SqliteUtils.class) {if (instance == null) {instance = new SqliteUtils(context);}}}return instance;}public SQLiteDatabase getDb() {return db;}} |
