android获取图库图片并返回

Uri uri = data.getData();
/*
 * 此时会抛出异常
* Uri uri = data.getData();
InputStream isl = getContentResolver().openInputStream(uri);
Bitmap b = BitmapFactory.decodeStream(isl);*/
try {
	InputStream is = getContentResolver().openInputStream(uri);
	BitmapFactory.Options opts = new Options();
	opts.inJustDecodeBounds = true;
	BitmapFactory.decodeStream(is, null, opts);
	//图片宽高
	int bitmapHeight = opts.outHeight;
	int bitmapWidth = opts.outWidth;
			
	int windowHeight = wm.getDefaultDisplay().getHeight();
	int windowWidth = wm.getDefaultDisplay().getWidth();
	//需要缩放
	if(bitmapHeight>windowHeight || bitmapWidth>windowWidth){
		int scaleX = bitmapWidth/windowWidth;
		int scaleY = bitmapHeight/windowHeight;
		if(scaleX>scaleY){//按照水平方向缩放
			opts.inSampleSize = scaleX;
		} else {//按照竖直方向缩放
			opts.inSampleSize = scaleY;
		}
	} else {//不用缩放
		opts.inSampleSize = 1;
	}
	//真正的解析图片
	opts.inJustDecodeBounds = false;
	//需要注意的事情 is先前已经用过  后面还要继续用 故需要重新获取
	is = getContentResolver().openInputStream(uri);
	Bitmap bitmap = BitmapFactory.decodeStream(is, null, opts);
	ib_main_logo.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
}