在開發程式的時候，有時會有喚醒螢幕並解鎖螢幕的需求。

這個demo的作用是在進入主介面後30秒喚醒螢幕並解鎖，僅供演示喚醒螢幕功能。

首先加入以下兩個許可權：

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

然後是activity中的程式碼，喚醒並解鎖螢幕

/*
 * 程式碼喚醒螢幕demo
 * 程式執行後一段時間喚醒螢幕
 */

import
 
 android.app.Activity;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.content.Context;
import android.os.Bundle;
import android.os.PowerManager;
import android.util.Log;
import android.view.Menu;

public class MainActivity extends Activity {

    Context context = MainActivity.this
 
;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         Thread wakeUpThread = new Thread(new WakeUpThread());
         wakeUpThread.start();
     }

    @Override
     public boolean
 
 onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

     class WakeUpThread implements Runnable{

        @Override
         public void run() {
             // TODO Auto-generated method stub
             try {
                 Thread.sleep(30*1000);//休眠一分鐘
                 //獲取電源管理器物件
                 Log.e("zhiyinqing","該開啟螢幕了");
                 PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
                 PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP |
                 PowerManager.SCREEN_DIM_WAKE_LOCK,"bright");
                 wl.acquire(); //點亮螢幕
                 //wl.release();//釋放

                 //螢幕解鎖
                 KeyguardManager km= (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
                 //得到鍵盤鎖管理器物件
                 KeyguardLock kl = km.newKeyguardLock("unLock");
                 //引數是LogCat裡用的Tag
                 kl.disableKeyguard();

             } catch (InterruptedException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }

         }

     }

}