在平时的开发中，我们会看到不管是微信发朋友圈照片还是微博发布新鲜事，添加图片的时候都是选完后面还有个+号再去选择图片，这样的话比较方便用户去添加图片，有的右上角还有个－号方便用户去删除图片，而一般用户选择的图片多少都是不定的，我们只限制最大张数，我们用gridview去实现，代码可能比较简单，高手请略过。
0.效果图
1.准备资源图片
添加图片的+号图片
删除图片的图片
2.可设置限制用户选择最大张数
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/** * 可以动态设置最多上传几张，之后就不显示+号了，用户也无法上传了 * 默认9张 */ private int maxImages = 9; /** * 获取最大上传张数 * * @return */ public int getMaxImages() { return maxImages; } /** * 设置最大上传张数 * * @param maxImages */ public void setMaxImages(int maxImages) { this.maxImages = maxImages; } |
3.设置GridView的总数
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/** * 让GridView中的数据数目加1最后一个显示+号 * 当到达最大张数时不再显示+号 * @return 返回GridView中的数量 */ @Override public int getCount() { int count = datas == null ? 1 : datas.size() + 1; if (count >= maxImages) { return datas.size(); } else { return count; } } |
4.getView()中根据position判断+号的显示
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@Overridepublic View getView(final int position, View convertView, ViewGroup parent) { ViewHolder viewHolder = null; if (convertView == null) { convertView = inflater.inflate(R.layout.item_published_grida, parent, false); viewHolder = new ViewHolder(convertView); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } /**代表+号之前的需要正常显示图片**/ if (datas != null && position < datas.size()) { final File file = new File(datas.get(position).get("path").toString()); Glide.with(context) .load(file) .priority(Priority.HIGH) .into(viewHolder.ivimage); viewHolder.btdel.setVisibility(View.VISIBLE); viewHolder.btdel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (file.exists()) { file.delete(); } datas.remove(position); notifyDataSetChanged(); } }); } else { /**代表+号的需要+号图片显示图片**/ Glide.with(context) .load(R.mipmap.image_add) .priority(Priority.HIGH) .centerCrop() .into(viewHolder.ivimage); viewHolder.ivimage.setScaleType(ImageView.ScaleType.FIT_XY); viewHolder.btdel.setVisibility(View.GONE); } return convertView;} |
5.GridView的完整代码
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package cn.bluemobi.dylan.gridviewaddimage;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.ImageView;import com.bumptech.glide.Glide;import com.bumptech.glide.Priority;import java.io.File;import java.util.ArrayList;import java.util.List;import java.util.Map;/** * com.bm.falvzixun.adapter.GridViewAddImgAdpter * * @author yuandl on 2015/12/24. * 添加上传图片适配器 */public class GridViewAddImgesAdpter extends BaseAdapter { private List<Map<String, Object>> datas; private Context context; private LayoutInflater inflater; /** * 可以动态设置最多上传几张，之后就不显示+号了，用户也无法上传了 * 默认9张 */ private int maxImages = 9; public GridViewAddImgesAdpter(List<Map<String, Object>> datas, Context context) { this.datas = datas; this.context = context; inflater = LayoutInflater.from(context); } /** * 获取最大上传张数 * * @return */ public int getMaxImages() { return maxImages; } /** * 设置最大上传张数 * * @param maxImages */ public void setMaxImages(int maxImages) { this.maxImages = maxImages; } /** * 让GridView中的数据数目加1最后一个显示+号 * 当到达最大张数时不再显示+号 * @return 返回GridView中的数量 */ @Override public int getCount() { int count = datas == null ? 1 : datas.size() + 1; if (count >= maxImages) { return datas.size(); } else { return count; } } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } public void notifyDataSetChanged(List<Map<String, Object>> datas) { this.datas = datas; this.notifyDataSetChanged(); } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder viewHolder = null; if (convertView == null) { convertView = inflater.inflate(R.layout.item_published_grida, parent, false); viewHolder = new ViewHolder(convertView); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } /**代表+号之前的需要正常显示图片**/ if (datas != null && position < datas.size()) { final File file = new File(datas.get(position).get("path").toString()); Glide.with(context) .load(file) .priority(Priority.HIGH) .into(viewHolder.ivimage); viewHolder.btdel.setVisibility(View.VISIBLE); viewHolder.btdel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (file.exists()) { file.delete(); } datas.remove(position); notifyDataSetChanged(); } }); } else { /**代表+号的需要+号图片显示图片**/ Glide.with(context) .load(R.mipmap.image_add) .priority(Priority.HIGH) .centerCrop() .into(viewHolder.ivimage); viewHolder.ivimage.setScaleType(ImageView.ScaleType.FIT_XY); viewHolder.btdel.setVisibility(View.GONE); } return convertView; } public class ViewHolder { public final ImageView ivimage; public final Button btdel; public final View root; public ViewHolder(View root) { ivimage = (ImageView) root.findViewById(R.id.iv_image); btdel = (Button) root.findViewById(R.id.bt_del); this.root = root; } }} |
6.用法
主布局文件activity_main.xml
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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#FFFFFF" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="cn.bluemobi.dylan.gridviewaddimage.MainActivity"> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:text="说点什么" android:textColor="#000000" /> <GridView android:layout_marginTop="10dp" android:id="@+id/gw" android:numColumns="5" android:horizontalSpacing="6dp" android:columnWidth="60dp" android:layout_width="match_parent" android:layout_height="match_parent" /></LinearLayout> |
gridview的item布局文件item_published_grida.xml
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<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="66dp" android:layout_height="66dp"> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/iv_image" android:layout_width="match_parent" android:gravity="center" android:layout_height="match_parent" android:scaleType="centerCrop"/> <Button android:id="@+id/bt_del" android:layout_width="20dp" android:layout_height="20dp" android:layout_alignParentRight="true" android:background="@drawable/bt_dynamic_del" /> </RelativeLayout></RelativeLayout> |
弹出拍照和从相册选择的对话框布局文件dialog_add_picture.xml
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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginLeft="5.0dip" android:layout_marginRight="5.0dip" android:background="@android:color/transparent" android:orientation="vertical"> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_margin="30px" android:orientation="vertical"> <TextView android:id="@+id/tv_camera" android:layout_width="wrap_content" android:layout_height="144px" android:background="@mipmap/btn_top_arc" android:gravity="center" android:text="拍照" android:textColor="#666666" android:textSize="48px" /> <ImageView android:layout_width="1022px" android:layout_height="4px" android:background="#666666" /> <TextView android:id="@+id/tv_gallery" android:layout_width="wrap_content" android:layout_height="144px" android:gravity="center" android:background="@mipmap/btn_bottom_arc" android:text="从手机相册选择" android:textColor="#666666" android:textSize="48px" /> </LinearLayout> <TextView android:id="@+id/tv_cancel" android:layout_width="wrap_content" android:layout_height="144px" android:layout_marginTop="20px" android:layout_marginLeft="30px" android:layout_marginRight="30px" android:layout_gravity="center_horizontal" android:background="@mipmap/btn_top_arc" android:gravity="center" android:text="取消" android:textColor="#666666" android:textSize="48px" /></LinearLayout> |
MainActivity
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package cn.bluemobi.dylan.gridviewaddimage;import android.app.Dialog;import android.content.Intent;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.Display;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.WindowManager;import android.widget.AdapterView;import android.widget.GridView;import android.widget.TextView;import android.widget.Toast;import net.bither.util.NativeUtil;import java.io.File;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends AppCompatActivity { private GridView gw; private List<Map<String, Object>> datas; private GridViewAddImgesAdpter gridViewAddImgesAdpter; private Dialog dialog; private final int PHOTO_REQUEST_CAREMA = 1;// 拍照 private final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择private static final String PHOTO_FILE_NAME = "temp_photo.jpg"; private File tempFile; private final String IMAGE_DIR = Environment.getExternalStorageDirectory() + "/gridview/"; /* 头像名称 */ private final String PHOTO_FILE_NAME = "temp_photo.jpg"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); gw = (GridView) findViewById(R.id.gw); datas = new ArrayList<>(); gridViewAddImgesAdpter = new GridViewAddImgesAdpter(datas, this); gw.setAdapter(gridViewAddImgesAdpter); gw.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) { showdialog(); } }); } /** * 选择图片对话框 */ public void showdialog() { View localView = LayoutInflater.from(this).inflate( R.layout.dialog_add_picture, null); TextView tv_camera = (TextView) localView.findViewById(R.id.tv_camera); TextView tv_gallery = (TextView) localView.findViewById(R.id.tv_gallery); TextView tv_cancel = (TextView) localView.findViewById(R.id.tv_cancel); dialog = new Dialog(this, R.style.custom_dialog); dialog.setContentView(localView); dialog.getWindow().setGravity(Gravity.BOTTOM); // 设置全屏 WindowManager windowManager = getWindowManager(); Display display = windowManager.getDefaultDisplay(); WindowManager.LayoutParams lp = dialog.getWindow().getAttributes(); lp.width = display.getWidth(); // 设置宽度 dialog.getWindow().setAttributes(lp); dialog.show(); tv_cancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { dialog.dismiss(); } }); tv_camera.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { dialog.dismiss(); // 拍照 camera(); } }); tv_gallery.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { dialog.dismiss(); // 从系统相册选取照片 gallery(); } }); } /** * 拍照 */ public void camera() { // 判断存储卡是否可以用，可用进行存储 if (hasSdcard()) { File dir = new File(IMAGE_DIR); if (!dir.exists()) { dir.mkdir(); } tempFile = new File(dir, System.currentTimeMillis() + "_" + PHOTO_FILE_NAME); //从文件中创建uri Uri uri = Uri.fromFile(tempFile); Intent intent = new Intent(); intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE); intent.addCategory(intent.CATEGORY_DEFAULT); // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA startActivityForResult(intent, PHOTO_REQUEST_CAREMA); } else { Toast.makeText(this, "未找到存储卡，无法拍照！", Toast.LENGTH_SHORT).show(); } } /** * 判断sdcard是否被挂载 */ public boolean hasSdcard() { return Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED); } /** * 从相册获取2 */ public void gallery() { Intent intent = new Intent( Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, PHOTO_REQUEST_GALLERY); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == RESULT_OK) { if (requestCode == PHOTO_REQUEST_GALLERY) { // 从相册返回的数据 if (data != null) { // 得到图片的全路径 Uri uri = data.getData(); String[] proj = {MediaStore.Images.Media.DATA}; //好像是android多媒体数据库的封装接口，具体的看Android文档 Cursor cursor = managedQuery(uri, proj, null, null, null); //按我个人理解 这个是获得用户选择的图片的索引值 int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); //将光标移至开头 ，这个很重要，不小心很容易引起越界 cursor.moveToFirst(); //最后根据索引值获取图片路径 String path = cursor.getString(column_index); uploadImage(path); } } else if (requestCode == PHOTO_REQUEST_CAREMA) { if (resultCode != RESULT_CANCELED) { // 从相机返回的数据 if (hasSdcard()) { if (tempFile != null) { uploadImage(tempFile.getPath()); } else { Toast.makeText(this, "相机异常请稍后再试！", Toast.LENGTH_SHORT).show(); } Log.i("images", "拿到照片path=" + tempFile.getPath()); } else { Toast.makeText(this, "未找到存储卡，无法存储照片！", Toast.LENGTH_SHORT).show(); } } } } } Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == 0xAAAAAAAA) { photoPath(msg.obj.toString()); } } }; /** * 上传图片 * * @param path */ private void uploadImage(final String path) { new Thread() { @Override public void run() { if (new File(path).exists()) { Log.d("images", "源文件存在" + path); } else { Log.d("images", "源文件不存在" + path); } File dir = new File(IMAGE_DIR); if (!dir.exists()) { dir.mkdir(); } final File file = new File(dir + "/temp_photo" + System.currentTimeMillis() + ".jpg"); NativeUtil.compressBitmap(path, file.getAbsolutePath(), 50); if (file.exists()) { Log.d("images", "压缩后的文件存在" + file.getAbsolutePath()); } else { Log.d("images", "压缩后的不存在" + file.getAbsolutePath()); } Message message = new Message(); message.what = 0xAAAAAAAA; message.obj = file.getAbsolutePath(); handler.sendMessage(message); } }.start(); } public void photoPath(String path) { Map<String,Object> map=new HashMap<>(); map.put("path",path); datas.add(map); gridViewAddImgesAdpter.notifyDataSetChanged(); }} |
7.GitHub源码 ：GridViewAddImage
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/linglongxin24/article/details/53034123
