调用一幅图片的查看器
String path = "/mnt/sdcard/aaa.jpg";
File a = new File(path);
// getHttpBitmap("http://192.168.200.44/a/1.jpg");
//
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(a), "image/*");
startActivity(intent);