棉花糖不会显示权限 window

Question

我有一个需要写日历的应用程序现在考虑 "critical" 所以我遵循指南 HERE 我在 Activity onCreate this cote

中添加了

private static final int REQUEST_WRITE_CALENDAR = 1453;
  ...
boolean hasPermission = (ContextCompat.checkSelfPermission(activity,
                Manifest.permission.WRITE_CALENDAR) == PackageManager.PERMISSION_GRANTED);
    if (!hasPermission) {
        ActivityCompat.requestPermissions(parentActivity,
                    new String[]{Manifest.permission.WRITE_CALENDAR},
                    REQUEST_WRITE_CALENDAR);
    }

但这并没有显示任何对话框。

此外，我似乎还应该添加此代码块来处理响应

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode)
    {
        case REQUEST_WRITE_STORAGE: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
            {
                //reload my activity with permission granted or use the features what required the permission
            } else
            {
                Toast.makeText(parentActivity, "The app was not allowed to write to your calendar.", Toast.LENGTH_LONG).show();
            }
        }
    }

}

Android 目标 SDK 是 23，是正确的。所以问题的原因与possible duplicate question中提出的不同。

Answer 1

判断权限状态的逻辑可以简化为：

if (ContextCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_CALENDAR) != PackageManager.PERMISSION_GRANTED) { 
    ActivityCompat.requestPermissions(parentActivity, 
                                      new String[]{Manifest.permission.WRITE_EXTERNAL_CALENDAR},
                                      REQUEST_WRITE_CALENDAR); 
}

您的 Activity 不必执行任何操作，覆盖 onRequestPermissionsResult 就足够了。

Answer 2

到问题的第二部分：

您可以在 activity 或片段中覆盖 onRequestPermissionsResult。如果你选择在片段而不是 activity 中这样做，你应该在你的 activity 中添加这样的东西（为了将回调传递给你的片段）：

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    for (Fragment frag : getSupportFragmentManager().getFragments()) {

        if (frag != null) {
                frag.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}

棉花糖不会显示权限 window

Marshmallow won't show permission window

android

android-permissions

android-6.0-marshmallow