<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <RelativeLayout  android:layout_width="match_parent"  android:layout_height="60dp"  android:background="#00BB9C">  <TextView   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_centerInParent="true"   android:text="寫動態(tài)"   android:textAppearance="?android:attr/textAppearanceLarge"   android:textColor="@android:color/white" />  <TextView   android:id="@+id/send"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_alignParentRight="true"   android:layout_centerVertical="true"   android:layout_marginRight="10dp"   android:text="發(fā)送"   android:textAppearance="?android:attr/textAppearanceLarge"   android:textColor="@android:color/white" /> </RelativeLayout> <LinearLayout  android:layout_width="match_parent"  android:layout_height="match_parent"  android:layout_margin="16dp"  android:orientation="vertical">  <EditText   android:layout_width="match_parent"   android:layout_height="100dp"   android:enabled="false"   android:focusable="false"   android:gravity="top"   android:hint="分享您的那點新鮮事兒..."   android:maxLines="5" />  <LinearLayout   android:layout_width="match_parent"   android:layout_height="match_parent"   android:padding="5dp">   <GridView    android:id="@+id/gridview"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:numColumns="4" />  </LinearLayout>   </LinearLayout></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><com.shenhua.tabhostdemo.selectimg.SquareRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content"> <ImageView  android:id="@+id/main_gridView_item_photo"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:layout_centerInParent="true"  android:contentDescription="@null"  android:padding="5dp"  android:scaleType="fitXY" /> <CheckBox  android:id="@+id/main_gridView_item_cb"  android:layout_width="20dp"  android:layout_height="20dp"  android:layout_alignParentEnd="true"  android:layout_alignParentRight="true"  android:layout_alignParentTop="true"  android:layout_margin="2dp"  android:background="@drawable/ic_delete"  android:backgroundTint="#00BB9C"  android:button="@null" /></com.shenhua.tabhostdemo.selectimg.SquareRelativeLayout>

package com.shenhua.tabhostdemo.selectimg;import android.content.Context;import android.util.AttributeSet;import android.widget.RelativeLayout;/** * 自定義方形布局 * Created by Shenhua on 4/25/2016. */public class SquareRelativeLayout extends RelativeLayout { public SquareRelativeLayout(Context context, AttributeSet attrs, int defStyle) {  super(context, attrs, defStyle); } public SquareRelativeLayout(Context context, AttributeSet attrs) {  super(context, attrs); } public SquareRelativeLayout(Context context) {  super(context); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));  int childWidthSize = getMeasuredWidth();  widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);  heightMeasureSpec = widthMeasureSpec;  super.onMeasure(widthMeasureSpec, heightMeasureSpec); }}

package com.shenhua.tabhostdemo.selectimg;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.GridView;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;import com.shenhua.tabhostdemo.R;import java.io.ByteArrayOutputStream;import java.util.ArrayList;import java.util.List;/** * Created by shenhua on 4/25/2016. */public class UploadPhotoActivity extends AppCompatActivity { private static final int IMG_COUNT = 8; private static final String IMG_ADD_TAG = "a"; private GridView gridView; private GVAdapter adapter; private TextView textView; private ImageView img; private List<String> list; @Override protected void onCreate(@Nullable Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_add_photo);  gridView = (GridView) findViewById(R.id.gridview);  textView = (TextView) findViewById(R.id.send);  textView.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    System.out.println("發(fā)送：" + Integer.toString(list.size() - 1));    upLoad();   }  });  initData(); } private void upLoad() {  Bitmap bitmap;  Bitmap bmpCompressed;  for (int i = 0; i < list.size() - 1; i++) {   bitmap = BitmapFactory.decodeFile(list.get(i));   bmpCompressed = Bitmap.createScaledBitmap(bitmap, 640, 480, true);   ByteArrayOutputStream bos = new ByteArrayOutputStream();   bmpCompressed.compress(Bitmap.CompressFormat.JPEG, 100, bos);   byte[] data = bos.toByteArray();   System.out.println(data);  } } private void initData() {  if (list == null) {   list = new ArrayList<>();   list.add(IMG_ADD_TAG);  }  adapter = new GVAdapter();  gridView.setAdapter(adapter);  gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {   @Override   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {    if (list.get(position).equals(IMG_ADD_TAG)) {     if (list.size() < IMG_COUNT) {      Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);      startActivityForResult(i, 0);     } else      Toast.makeText(UploadPhotoActivity.this, "最多只能選擇7張照片！", Toast.LENGTH_SHORT).show();    }   }  });  refreshAdapter(); } private void refreshAdapter() {  if (list == null) {   list = new ArrayList<>();  }  if (adapter == null) {   adapter = new GVAdapter();  }  adapter.notifyDataSetChanged(); } private class GVAdapter extends BaseAdapter {  @Override  public int getCount() {   return list.size();  }  @Override  public Object getItem(int position) {   return null;  }  @Override  public long getItemId(int position) {   return 0;  }  @Override  public View getView(final int position, View convertView, ViewGroup parent) {   final ViewHolder holder;   if (convertView == null) {    convertView = LayoutInflater.from(getApplication()).inflate(R.layout.activity_add_photo_gv_items, parent, false);    holder = new ViewHolder();    holder.imageView = (ImageView) convertView.findViewById(R.id.main_gridView_item_photo);    holder.checkBox = (CheckBox) convertView.findViewById(R.id.main_gridView_item_cb);    convertView.setTag(holder);   } else {    holder = (ViewHolder) convertView.getTag();   }   String s = list.get(position);   if (!s.equals(IMG_ADD_TAG)) {    holder.checkBox.setVisibility(View.VISIBLE);    holder.imageView.setImageBitmap(ImageTool.createImageThumbnail(s));   } else {    holder.checkBox.setVisibility(View.GONE);    holder.imageView.setImageResource(R.mipmap.ic_photo_upload);   }   holder.checkBox.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {     list.remove(position);     refreshAdapter();    }   });   return convertView;  }  private class ViewHolder {   ImageView imageView;   CheckBox checkBox;  } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {  super.onActivityResult(requestCode, resultCode, data);  if (data == null) {   System.out.println("data null");   return;  }  if (requestCode == 0) {   final Uri uri = data.getData();   String path = ImageTool.getImageAbsolutePath(this, uri);   System.out.println(path);   if (list.size() == IMG_COUNT) {    removeItem();    refreshAdapter();    return;   }   removeItem();   list.add(path);   list.add(IMG_ADD_TAG);   refreshAdapter();  } } private void removeItem() {  if (list.size() != IMG_COUNT) {   if (list.size() != 0) {    list.remove(list.size() - 1);   }  } }}

package com.shenhua.tabhostdemo.selectimg;import android.annotation.TargetApi;import android.app.Activity;import android.content.ContentUris;import android.content.Context;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Environment;import android.provider.DocumentsContract;import android.provider.MediaStore;/** * Created by shenhua on 4/26/2016. */public class ImageTool { /**  * 獲取圖片的絕對路徑，需要添加用戶權(quán)限  */ @TargetApi(19) public static String getImageAbsolutePath(Activity context, Uri imageUri) {  if (context == null || imageUri == null)   return null;  if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {   if (isExternalStorageDocument(imageUri)) {    String docId = DocumentsContract.getDocumentId(imageUri);    String[] split = docId.split(":");    String type = split[0];    if ("primary".equalsIgnoreCase(type)) {     return Environment.getExternalStorageDirectory() + "/" + split[1];    }   } else if (isDownloadsDocument(imageUri)) {    String id = DocumentsContract.getDocumentId(imageUri);    Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));    return getDataColumn(context, contentUri, null, null);   } else if (isMediaDocument(imageUri)) {    String docId = DocumentsContract.getDocumentId(imageUri);    String[] split = docId.split(":");    String type = split[0];    Uri contentUri = null;    if ("image".equals(type)) {     contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;    } else if ("video".equals(type)) {     contentUri = null;//不獲取視頻    } else if ("audio".equals(type)) {     contentUri = null;//不獲取音頻    }    String selection = MediaStore.Images.Media._ID + "=?";    String[] selectionArgs = new String[]{split[1]};    return getDataColumn(context, contentUri, selection, selectionArgs);   }  } // MediaStore (and general)  else if ("content".equalsIgnoreCase(imageUri.getScheme())) {   if (isGooglePhotosUri(imageUri))    return imageUri.getLastPathSegment();   return getDataColumn(context, imageUri, null, null);  }  // File  else if ("file".equalsIgnoreCase(imageUri.getScheme())) {   return imageUri.getPath();  }  return null; } public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {  Cursor cursor = null;  String column = MediaStore.Images.Media.DATA;  String[] projection = {column};  try {   cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);   if (cursor != null && cursor.moveToFirst()) {    int index = cursor.getColumnIndexOrThrow(column);    return cursor.getString(index);   }  } finally {   if (cursor != null)    cursor.close();  }  return null; } /**  * @param uri The Uri to check.  * @return Whether the Uri authority is ExternalStorageProvider.  */ public static boolean isExternalStorageDocument(Uri uri) {  return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /**  * @param uri The Uri to check.  * @return Whether the Uri authority is DownloadsProvider.  */ public static boolean isDownloadsDocument(Uri uri) {  return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /**  * @param uri The Uri to check.  * @return Whether the Uri authority is MediaProvider.  */ public static boolean isMediaDocument(Uri uri) {  return "com.android.providers.media.documents".equals(uri.getAuthority()); } /**  * @param uri The Uri to check.  * @return Whether the Uri authority is Google Photos.  */ public static boolean isGooglePhotosUri(Uri uri) {  return "com.google.android.apps.photos.content".equals(uri.getAuthority()); } /**  * 創(chuàng)建圖片縮略圖  *  * @param filePath  * @return  */ public static Bitmap createImageThumbnail(String filePath) {  Bitmap bitmap = null;  BitmapFactory.Options opts = new BitmapFactory.Options();  opts.inJustDecodeBounds = true;  BitmapFactory.decodeFile(filePath, opts);  opts.inSampleSize = computeSampleSize(opts, -1, 128 * 128);  opts.inJustDecodeBounds = false;  try {   bitmap = BitmapFactory.decodeFile(filePath, opts);  } catch (Exception e) {   // TODO: handle exception  }  return bitmap; } public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {  int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);  int roundedSize;  if (initialSize <= 8) {   roundedSize = 1;   while (roundedSize < initialSize) {    roundedSize <<= 1;   }  } else {   roundedSize = (initialSize + 7) / 8 * 8;  }  return roundedSize; } private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {  double w = options.outWidth;  double h = options.outHeight;  int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));  int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));  if (upperBound < lowerBound) {   // return the larger one when there is no overlapping zone.   return lowerBound;  }  if ((maxNumOfPixels == -1) && (minSideLength == -1)) {   return 1;  } else if (minSideLength == -1) {   return lowerBound;  } else {   return upperBound;  } }}

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />