動态注冊廣播接收者,螢幕鎖定Android

1.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.glsite.screenreceiver">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
           

2.ScreenReceiver

package com.glsite.screenreceiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

/**
 * @author glsite.com
 * @version $Rev$
 * @des ${TODO}
 * @updateAuthor $Author$
 * @updateDes ${TODO}
 */
public class ScreenReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if ("android.intent.action.SCREEN_ON".equals(action)) {
        Toast.makeText(context,"螢幕解鎖啦", Toast.LENGTH_SHORT).show();
        System.out.println("螢幕解鎖啦");
    } else if ("android.intent.action.SCREEN_OFF".equals(action)) {
        Toast.makeText(context,"螢幕鎖定啦，可以做清理緩存的操作啦", Toast.LENGTH_SHORT).show();
        System.out.println("螢幕鎖定啦，可以做清理緩存的操作啦");
    }
}
}
           

3.MainActivity

package com.glsite.screenreceiver;

import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private ScreenReceiver mScreenReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {//動态注冊
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mScreenReceiver = new ScreenReceiver();
        IntentFilter filter = new IntentFilter();//建立過濾器
        filter.addAction("android.intent.action.SCREEN_ON");
        filter.addAction("android.intent.action.SCREEN_OFF");
        getApplicationContext().registerReceiver(mScreenReceiver, filter);
    }

    @Override
    protected void onDestroy() {//反注冊
        unregisterReceiver(mScreenReceiver);
        super.onDestroy();
    }
}