屏幕关闭时如何获取Android.Telephony.PhoneState?

尝试创建BroadcastReceiver类

https://developer.android.com/guide/components/broadcasts

AndroidManifest.xml 文件,我想你需要得到以下许可

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

AndroidManifest.xml文件

    <receiver android:name="//BroadcastReceiver Class Name" android:enabled="true">
        <intent-filter>
            <action android:name="android.intent.action.PHONE_STATE">

            </action>
        </intent-filter>
    </receiver> 

AndroidManifest.xml 文件,我想你需要得到以下许可

<uses-permission
            android:name="android.permission.MODIFY_PHONE_STATE"
            tools:ignore="ProtectedPermissions" />
        <uses-permission android:name="android.permission.CALL_PHONE" /> 

 <receiver android:name=".services.Blocker">
            <intent-filter android:priority="1000">
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
        </receiver>

拦截器.java

public class Blocker extends BroadcastReceiver {
@Override
    public void onReceive(Context context, Intent intent) {
     /* write your code here */
    }
}