java - 我如何在android上调用本机查看器？或者实现缩放和旋转图像？

Question

我有图像的路径，我想从 android 调用本机查看器，因为用户想要缩放和旋转图像的选项。我必须努力做到这一点，或者我可以调用原生 Intent？

Answer 1

调用本机 viwer ：

Intent i = new Intent(Intent.ACTION_VIEW); 
i.setDataAndType(Uri.fromFile(new File(path)), "image/jpg");

PackageManager packageManager = getPackageManager();
List<ResolveInfo> activities = packageManager.queryIntentActivities(i, 0);
boolean isIntentSafe = activities.size() > 0;

// Start an activity if it's safe
if (isIntentSafe) {
    startActivity(i);
}