Question

我有一个带对话框的活动。在单击ImageView时的对话框中，默认的相机应用程序启动，当我创建照片并单击刻度图标（至少它是我手机上的刻度图标）时，之前的活动将被重新创建，销毁并重新创建。这种情况大约发生在10次中。

这就是发生的事情

1. Intent opens camera
2. onPause()
3. onSaveInstanceState runs
4. onStop()
5. onDestroy() 
6. Camera app opens, picture is taken and I click tick
7. onStart﹕()
8. onRestoreInstanceState runs
9. onResume()
10. onPause()
11. onSaveInstanceState
12. onStop()
13. onDestroy()
14. onStart﹕()
15. onRestoreInstanceState

因此，即使我在onSaveInstanceState中保存我需要的数据（步骤3）并且在onRestoreInstanceState中检索它（步骤8），它也会在活动被销毁时丢失（我使用一个标志来决定我是否想要保存数据，第二次重新创建活动时该标志变为null。我可以在SharedPreferences中保存所有内容，但是，这仍然是我想要纠正的不需要的功能。

如果重要，请参阅以下代码：

意图

btn_camera.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View arg0) {
   which_dialog = "complete";
   complete_dialog.dismiss();
   imageFileForCamera_ = getTemporaryDirectory();
   Intent intentPicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
   if (imageFileForCamera_ != null) {
      intentPicture.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(imageFileForCamera_));
   }
startActivityForResult(intentPicture,PICK_FROM_CAMERA_COMPLETE_KITKAT);

onActivityResult：

case PICK_FROM_CAMERA_COMPLETE_KITKAT:
  selectedImageUri = Uri.fromFile(imageFileForCamera_);
  complete_dialog.show();
  (...more code...)

的onSaveInstanceState

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    if (which_dialog != null && which_dialog.length() > 1) {
       outState.putString("which_dialog", which_dialog);
       outState.putSerializable(INSTANCE_STATE_IMAGE_FILE_FOR_CAMERA, imageFileForCamera_);
    } else {
       Log.i("onSaveInstanceState which_dialog", "which_dialog is null");
    }
}

onRestoreInstanceState

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    if (savedInstanceState != null) {
        if (savedInstanceState.containsKey("which_dialog")) {
           if (savedInstanceState.getString("which_dialog").equals("complete")) {
               complete_dialog = new CompleteDialog(Activity.this);
               imageFileForCamera_ = (File)savedInstanceState.getSerializable(INSTANCE_STATE_IMAGE_FILE_FOR_CAMERA);
            }
        }
    } else {
         Log.i("onRestoreInstanceState", "savedInstanceState is null");
    }
}

Answer 1

您正在which_dialog中保存onSaveInstanceState()。您无法在which_dialog中恢复onRestoreInstanceState()。根据您在onRestoreInstanceState()中保存的值修改which_dialog以设置onSaveInstanceState()。

从相机应用程序返回后，活动被销毁

1 个答案: