从 Intent 中获取结果

Question

我想用 registerForActivityResult 检查 ACTION_MANAGE_OVERLAY_PERMISSION 而这段代码不起作用，当我检查权限时，没有出现 Toast “Ok”

mStartForResult.launch(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION));

ActivityResultLauncher<Intent> mStartForResult = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(),
            new ActivityResultCallback<ActivityResult>() {
                @Override
                public void onActivityResult(ActivityResult result) {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        Toast.makeText(MainActivity.this,"Ok",Toast.LENGTH_SHORT).show();
                    }
                }
            });```

Answer 1

那个Intent 动作is not documented to return anything。所以，你永远不会得到Activity.RESULT_OK。