Android N:在更新复选框首选项之前检查DND状态是否已更改 [英] Android N: checking for DND state changed before updating checkbox preference

问题描述

我的应用程序将振铃器模式设置为静音，但是使用Android N我得到了java.lang.SecurityException: Not allowed to change Do Not Disturb state.

My app sets the ringer mode to silent but with Android N I get a java.lang.SecurityException: Not allowed to change Do Not Disturb state.

我遵循了

I followed the steps from this post and the following code will open an activity which contains a toggle button for enabling the permission to change the ringer mode. This activity can be "backed" from without the enabling of the permission.

Intent intent = new Intent(
                        android.provider.Settings
                        .ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS);

    startActivity(intent);

问题是我想确保在尝试使用无提示振铃模式功能之前已授予该权限.

The problem is that I want to ensure that the permission is granted before attempting to use the silent ringer mode functionality.

我正在添加CheckBoxPreference来启用和禁用此铃声模式切换.因此，如果选中此复选框，则可以将振铃器模式设置为无声，如果没有，则不会更改振铃器模式.

I'm adding a CheckBoxPreference to enable and disable of this ringer mode toggling. So if the checkbox is checked, I can set the ringer mode to silent and if it's not, I will not change the ringer mode.

直到现在，当用户单击复选框时，我设法启动了此权限请求:

Until now I managed to start this permission request when the user clicks the checkbox:

disableSoundCheckboxPreference.setOnPreferenceChangeListener(
                new Preference.OnPreferenceChangeListener() {
                    @Override
                    public boolean onPreferenceChange(Preference preference, Object o) {
...
// check for Android N and start the activity mentioned above

但是，仅在授予许可的情况下，启用此复选框的正确方法是什么?我想它应该与ACTION_NOTIFICATION_POLICY_ACCESS_GRANTED_CHANGED和一个侦听器有关，但是我需要一些想法来实现这一点.

But what is the correct way to enable this checkbox only if the permission was granted? I guess it should have something to do with ACTION_NOTIFICATION_POLICY_ACCESS_GRANTED_CHANGEDand a listener but I would need some ideas to implement this.

谢谢！

推荐答案

我设法解决了这个问题，并将在其他人需要的时候发布答案.

I managed to solve this and will post the answer in case someone else needs it.

在这种情况下，不需要BroadcastListener.您只需要在用户首次使用OnPreferenceClickListener

A BroadcastListener is not needed in this case. You just need to request the permission when the user first clicks on the preference with an OnPreferenceClickListener:

private void requestNotificationPolicyAccess() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && !isNotificationPolicyAccessGranted()) {
            Intent intent = new Intent(android.provider.Settings.
                    ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS);
            startActivity(intent);

如果用户授予许可，则当他再次单击时，将允许用户更改CheckBox的状态.如果未授予该权限，则将继续用更新CheckBox，并可能在android:summary中写入必须首先授予该权限.您可以通过以下方式进行验证:

If the user grants the permission, when he will click again, you will allow the user to change the state of the CheckBox. If the permission is not granted, you will continue updating the CheckBox with "false" and maybe write in it's android:summary that permission must be granted first. You can verify with:

private boolean isNotificationPolicyAccessGranted()  {
    NotificationManager notificationManager = (NotificationManager)
            getActivity().getSystemService(Context.NOTIFICATION_SERVICE);
    return notificationManager.isNotificationPolicyAccessGranted();
}

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