Android实现QQ图片说说照片选择效果

<?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="写动态"
   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="发送"
   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="分享您的那点新鲜事儿..."
   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;

/**
 * 自定义方形布局
 * 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("发送：" + 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, "最多只能选择7张照片！", 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 {
/**
* 获取图片的绝对路径，需要添加用户权限
*/
@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;//不获取视频
} else if ("audio".equals(type)) {
contentUri = null;//不获取音频
}
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());
}
/**
* 创建图片缩略图
*
* @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" /