清除意图动作默认值

Question

I am launching the camera app in normal or secure mode depending on what gesture is performed using my app but once the user selects the app and taps Always then there is no option to change the defaults, even from the settings menu in Android.

camera_intent = new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA);
secure_camera_intent = new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE);
camera_intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
secure_camera_intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

this.startActivity(camera_intent);
//this.startActivity(secure_camera_intent);

Is there a workaround? I want to show the camera selection dialog once again so that the user can change his choice.

Answer 1

If you want to present the app chooser even if the user has a default activity selected for the task, use Intent.createChooser() .

From the Android developer guide :

If you call Intent.createChooser(), passing it your Intent object, it returns a version of your intent that will always display the chooser. This has some advantages:

• Even if the user has previously selected a default action for this intent, the chooser will still be displayed.
• If no applications match, Android displays a system message.
• You can specify a title for the chooser dialog.

You should also check the documentation for ACTION_CHOOSER for guidelines on where this is appropriate or not (Intent.createChooser() is just a convenience method for this).

Answer 2

startActivity(Intent.createChooser(senderIntent, "Title here"));

它将始终显示选择器对话框。