ImageView和Bitmap的转换，实例：设置当前查看图片为桌面背景

ImageView转Bitmap

Bitmap bitmap = ((BitmapDrawable)img.getDrawable()).getBitmap();

Bitmap bitmap = ((BitmapDrawable)img.getDrawable()).getBitmap();

	@Override
		public boolean onLongClick(View v) {
			if(v.getId()==R.id.listener_imageView1){
				//长摁设置桌面背景
				//1.清楚已有做面
				try {
					ListenerDemoActivity.this.clearWallpaper();
//					ListenerDemoActivity.this.setWallpaper(getApplicationContext().getResources().openRawResource(R.drawable.pic1));
					textView2.setText("设置手机桌面背景成功！");

					Bitmap bitmap = ((BitmapDrawable)img.getDrawable()).getBitmap();
					ListenerDemoActivity.this.setWallpaper(bitmap);

				} catch (IOException e) {
					textView2.setText("设置手机桌面背景失败！！");
					e.printStackTrace();
				}
			}
			return false;
		}
	}