Update StaggeredAdapter.java

src/com/example/staggeredgridviewdemo/StaggeredAdapter.java

@@ -14,11 +14,21 @@
 public class StaggeredAdapter extends ArrayAdapter<String> {
 
 	private ImageLoader mLoader;
+
+	//记录图片的多选
+	private Map<String,String> map = new HashMap<String, String>();
+
 
 	public StaggeredAdapter(Context context, int textViewResourceId,
 			String[] objects) {
 		super(context, textViewResourceId, objects);
 		mLoader = new ImageLoader(context);
+
+		//初始化map 默认都是没有选中状态
+		for (int i = 0; i < objects.length; i++) {
+			String temp =String.valueOf(i);
+			map.put(temp, "false");
+		}
 	}
 
 	@Override
@@ -38,11 +48,92 @@ public View getView(int position, View convertView, ViewGroup parent) {
 		holder = (ViewHolder) convertView.getTag();
 
 		mLoader.DisplayImage(getItem(position), holder.imageView);
+
+
+		// 增加图片多选状态
+		 Resources res=convertView.getResources();    
+
+	    Bitmap bmp=BitmapFactory.decodeResource(res,R.drawable.select01); 
+
+		if(map.get(selectid).equals("true"))
+		{	
+			holder.imageView.setImageBitmap(this.compositeImages(this.drawableToBitmap(holder.imageView.getDrawable()), bmp) );
+		}	
+
+
+		// 图片点击更新是否选中
+		holder.imageView.setOnClickListener(new OnClickListener() {
+
+			@Override
+			public void onClick(View arg0) {
+				// TODO Auto-generated method stub
+				Log.i("adapter", "---------------dianwole="+arg0);
+
+				if(map.get(selectid).equals("true"))
+				{
+					map.put(selectid, "false");
+				}
+				else
+				{
+					map.put(selectid, "true");
+				}
+				notifyDataSetChanged();
+			}
+		});
+
+		//
+
+
+
+
 
 		return convertView;
 	}
 
 	static class ViewHolder {
 		ScaleImageView imageView;
 	}
+
+
+
+	// 图片合成方法
+	  private Bitmap compositeImages(Bitmap srcBitmap,Bitmap dstBitmap){   
+
+	        Bitmap bmp = null;   
+	        //下面这个Bitmap中创建的函数就可以创建一个空的Bitmap   
+	        bmp = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());   
+	        Paint paint = new Paint();   
+	        Canvas canvas = new Canvas(bmp);   
+	        //首先绘制第一张图片，很简单，就是和方法中getDstImage一样   
+	        canvas.drawBitmap(srcBitmap, 0, 0, paint);         
+
+	        //在绘制第二张图片的时候，我们需要指定一个Xfermode   
+	        //这里采用Multiply模式，这个模式是将两张图片的对应的点的像素相乘   
+	        //，再除以255，然后以新的像素来重新绘制显示合成后的图像   
+
+	        Log.i("srcBitmap.getWidth()","srcBitmap.getWidth()="+srcBitmap.getWidth());
+
+	        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));   
+	        canvas.drawBitmap(dstBitmap, srcBitmap.getWidth()-dstBitmap.getWidth()-10, 0, paint);   
+
+	        return bmp;   
+	    }   
+
+
+	  private Bitmap drawableToBitmap(Drawable drawable) {    
+
+	        Bitmap bitmap = Bitmap    
+	                        .createBitmap(    
+	                                        drawable.getIntrinsicWidth(),    
+	                                        drawable.getIntrinsicHeight(),    
+	                                        drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888    
+	                                                        : Bitmap.Config.RGB_565);    
+	        Canvas canvas =  new  Canvas(bitmap);    
+	         //canvas.setBitmap(bitmap);    
+	        drawable.setBounds( 0 ,  0 , drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());    
+	        drawable.draw(canvas);    
+	        return  bitmap;    
+	}   
+
+
 }