本文所述实例为一个天气预报中的android代码，主要包括了下载和安装APK、检查Apk更新、显示'已经是最新'或者'无法获取版本信息'对话框、获取当前客户端版本信息、显示版本更新通知对话框、显示下载对话框、判断是否挂载了SD卡、显示文件大小格式：2个小数点显示等。具体实现代码如下：
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import java.io.ByteArrayInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.text.DecimalFormat;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.conn.ConnectTimeoutException;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.params.CoreConnectionPNames;import org.apache.http.util.EntityUtils;import org.lmw.weather.R;import org.lmw.weather.entity.AppDetail;import android.app.AlertDialog;import android.app.Dialog;import android.app.ProgressDialog;import android.app.AlertDialog.Builder;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.content.DialogInterface.OnCancelListener;import android.content.DialogInterface.OnClickListener;import android.content.pm.PackageInfo;import android.content.pm.PackageManager.NameNotFoundException;import android.net.Uri;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.View;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast;public class DownloadManager { private static final int DOWN_NOSDCARD = 0; private static final int DOWN_UPDATE = 1; private static final int DOWN_OVER = 2; private static final int DOWN_ERROR=3; private static final int DIALOG_TYPE_LATEST = 0; private static final int DIALOG_TYPE_FAIL = 1; private static final int DIALOG_TYPE_INTERNETERROR = 2; private static DownloadManager downloadManager; private Context mContext; // 通知对话框 private Dialog noticeDialog; // 下载对话框 private Dialog downloadDialog; // 进度条 private ProgressBar mProgress; // 显示下载数值 private TextView mProgressText; // 查询动画 private ProgressDialog mProDialog; // '已经是最新' 或者 '无法获取最新版本' 的对话框 private Dialog latestOrFailDialog; // 返回的安装包url private String apkUrl = ""; // 进度值 private int progress; // 下载线程 private Thread downLoadThread; // 终止标记 private boolean interceptFlag; // 提示语 private String updateMsg = ""; // 下载包保存路径 private String savePath = ""; // apk保存完整路径 private String apkFilePath = ""; // 临时下载文件路径 private String tmpFilePath = ""; // 下载文件大小 private String apkFileSize; // 已下载文件大小 private String tmpFileSize; private String curVersionName = ""; private int curVersionCode; private AppDetail mDownload; private String checkUrl="http://192.168.0.133:8080/lmw/androidMarket/SimpleWeather-20130701093349937/update.xml"; private Handler mHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case DOWN_UPDATE: mProgress.setProgress(progress); mProgressText.setText(tmpFileSize + "/" + apkFileSize); break; case DOWN_OVER: downloadDialog.dismiss(); installApk(); break; case DOWN_NOSDCARD: downloadDialog.dismiss(); Toast.makeText(mContext, "无法下载安装文件，请检查SD卡是否挂载",Toast.LENGTH_SHORT).show(); break; case DOWN_ERROR: downloadDialog.dismiss(); if(msg.arg1==0){ Toast.makeText(mContext, "网络不给力啊", Toast.LENGTH_SHORT).show(); }else if(msg.arg1==1||msg.arg1==2){ Toast.makeText(mContext, "未找到资源",Toast.LENGTH_SHORT).show(); } break; } }; }; public static DownloadManager getDownloadManager() { if (downloadManager == null) { downloadManager = new DownloadManager(); } downloadManager.interceptFlag = false; return downloadManager; } public void DownLoader(Context context, AppDetail download) { this.mContext = context; this.mDownload = download; showDownloadDialog(); } /** * 检查App更新 * @param context * @param isShowMsg * 是否显示提示消息 */ public void checkAppUpdate(Context context, final boolean isShowMsg,final boolean notmain) { this.mContext = context; getCurrentVersion(mContext); if (isShowMsg) { if (mProDialog == null) mProDialog = ProgressDialog.show(mContext, null, "正在检测，请稍后...",true, true); else if (mProDialog.isShowing()|| (latestOrFailDialog != null && latestOrFailDialog.isShowing())) return; } final Handler handler = new Handler() { public void handleMessage(Message msg) { // 进度条对话框不显示 - 检测结果也不显示 if (mProDialog != null && !mProDialog.isShowing()) { return; } // 关闭并释放释放进度条对话框 if (isShowMsg && mProDialog != null) { mProDialog.dismiss(); mProDialog = null; } // 显示检测结果 if (msg.what == 1) { mDownload = (AppDetail) msg.obj; if (mDownload != null) { if (curVersionCode < mDownload.getVersionCode()) { apkUrl = mDownload.getUri()+mDownload.getFileName(); updateMsg = mDownload.getAppHistory(); showNoticeDialog(); } else if (isShowMsg) { if (notmain) { showLatestOrFailDialog(DIALOG_TYPE_LATEST); } } } }else if(msg.what==-1&&isShowMsg){ showLatestOrFailDialog(DIALOG_TYPE_INTERNETERROR); }else if (isShowMsg) { showLatestOrFailDialog(DIALOG_TYPE_FAIL); } } }; new Thread() { public void run() { Message msg = new Message(); try { DefaultHttpClient client = new DefaultHttpClient(); client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 3000); HttpGet get = new HttpGet(checkUrl); HttpResponse response = client.execute(get); if (response.getStatusLine().getStatusCode() == 200) { HttpEntity entity = response.getEntity(); InputStream stream = new ByteArrayInputStream( EntityUtils.toString(entity, "gb2312").getBytes()); AppDetail update = AppDetail.parseXML(stream); msg.what = 1; msg.obj = update; }else{ msg.what = -1; } } catch (Exception e) { e.printStackTrace(); msg.what = -1; } handler.sendMessage(msg); } }.start(); } /*显示'已经是最新'或者'无法获取版本信息'对话框*/ private void showLatestOrFailDialog(int dialogType) { String ToastMsg=""; if (latestOrFailDialog != null) { // 关闭并释放之前的对话框 latestOrFailDialog.dismiss(); latestOrFailDialog = null; }// AlertDialog.Builder builder = new Builder(mContext);// builder.setTitle("系统提示"); if (dialogType == DIALOG_TYPE_LATEST) {// builder.setMessage("您当前已经是最新版本"); ToastMsg="您当前已经是最新版本"; } else if (dialogType == DIALOG_TYPE_FAIL) {// builder.setMessage("无法获取版本更新信息"); ToastMsg="无法获取版本更新信息"; }else if(dialogType==DIALOG_TYPE_INTERNETERROR){// builder.setMessage("网络故障，无法连接服务器"); ToastMsg="网络故障，无法连接服务器"; } Toast.makeText(mContext, ToastMsg, Toast.LENGTH_SHORT).show(); } /*获取当前客户端版本信息*/ public String getCurrentVersion(Context context) { try { PackageInfo info = context.getPackageManager().getPackageInfo(context.getPackageName(), 0); curVersionName = info.versionName; curVersionCode = info.versionCode; } catch (NameNotFoundException e) { e.printStackTrace(System.err); } return curVersionName; } /*显示版本更新通知对话框*/ private void showNoticeDialog() { AlertDialog.Builder builder = new Builder(mContext); builder.setTitle("软件版本更新"); builder.setMessage(updateMsg); builder.setPositiveButton("立即更新", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); showDownloadDialog(); } }); builder.setNegativeButton("以后再说", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); noticeDialog = builder.create(); noticeDialog.show(); } /*显示下载对话框*/ private void showDownloadDialog() { AlertDialog.Builder builder = new Builder(mContext); builder.setTitle("正在下载安装包"); final LayoutInflater inflater = LayoutInflater.from(mContext); View v = inflater.inflate(R.layout.download_progress, null); mProgress = (ProgressBar) v.findViewById(R.id.update_progress); mProgressText = (TextView) v.findViewById(R.id.update_progress_text); builder.setView(v); builder.setNegativeButton("取消", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); interceptFlag = true; } }); builder.setOnCancelListener(new OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { dialog.dismiss(); interceptFlag = true; } }); downloadDialog = builder.create(); downloadDialog.setCanceledOnTouchOutside(false); downloadDialog.show(); downloadApk(); } private Runnable mdownApkRunnable = new Runnable() { Message error_msg=new Message(); @Override public void run(){ try { String apkName = mDownload.getFileName().replace(".apk","")+".apk"; String tmpApk = mDownload.getFileName().replace(".apk","")+".tmp"; // 判断是否挂载了SD卡 String storageState = Environment.getExternalStorageState(); if (storageState.equals(Environment.MEDIA_MOUNTED)) { savePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/QN/QNStore/"; File file = new File(savePath); if (!file.exists()) { file.mkdirs(); } apkFilePath = savePath + apkName; tmpFilePath = savePath + tmpApk; } // 没有挂载SD卡，无法下载文件 if (apkFilePath == null || apkFilePath == "") { mHandler.sendEmptyMessage(DOWN_NOSDCARD); return; } File ApkFile = new File(apkFilePath); // 是否已下载更新文件// if (ApkFile.exists()) {// downloadDialog.dismiss();// installApk();// return;// } // 输出临时下载文件 File tmpFile = new File(tmpFilePath); FileOutputStream fos = new FileOutputStream(tmpFile); URL url = new URL(mDownload.getUri()+mDownload.getFileName()); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); try { conn.connect(); } catch (ConnectTimeoutException e) { error_msg.what=DOWN_ERROR; error_msg.arg1=0; mHandler.sendMessage(error_msg); } int length = conn.getContentLength(); InputStream is = conn.getInputStream(); // 显示文件大小格式：2个小数点显示 DecimalFormat df = new DecimalFormat("0.00"); // 进度条下面显示的总文件大小 apkFileSize = df.format((float) length / 1024 / 1024) + "MB"; int count = 0; byte buf[] = new byte[1024]; do { int numread = is.read(buf); count += numread; // 进度条下面显示的当前下载文件大小 tmpFileSize = df.format((float) count / 1024 / 1024) + "MB"; // 当前进度值 progress = (int) (((float) count / length) * 100); // 更新进度 mHandler.sendEmptyMessage(DOWN_UPDATE); if (numread <= 0) { // 下载完成 - 将临时下载文件转成APK文件 if (tmpFile.renameTo(ApkFile)) { // 通知安装 mHandler.sendEmptyMessage(DOWN_OVER); } break; } fos.write(buf, 0, numread); } while (!interceptFlag);// 点击取消就停止下载 fos.close(); is.close(); } catch (MalformedURLException e) { error_msg.what=DOWN_ERROR; error_msg.arg1=1; mHandler.sendMessage(error_msg); e.printStackTrace(); } catch (IOException e) { error_msg.what=DOWN_ERROR; error_msg.arg1=2; mHandler.sendMessage(error_msg); e.printStackTrace(); } } }; /** * 下载apk * @param url */ private void downloadApk() { downLoadThread = new Thread(mdownApkRunnable); downLoadThread.start(); } /** * 安装apk * @param url */ private void installApk() { File apkfile = new File(apkFilePath); if (!apkfile.exists()) { return; } Intent i = new Intent(Intent.ACTION_VIEW); i.setDataAndType(Uri.parse("file://" + apkfile.toString()),"application/vnd.android.package-archive"); mContext.startActivity(i); }} |
