Android APP一段时间无操作显示屏保

     开发环境为eclipse，因为demo简单就没有使用android studio，android studio每次运行都要gradle编译一次，速度慢。 

     项目需要，做了一个Android TV 视频播放器的屏保，大概的需求就是app在没有播放视频的情况了五分钟没有操作就跳出屏保，屏保接入广告系统。我下面给出的例子demo在时间超时的时候会跳出屏幕，在接收到锁屏广播的时候也会显示屏保。

     主要讲一下使用双线程来实现五分钟无操作跳出屏保，可以在application里面启动监听线程，也可以在activity的oncreated方法里面启动监听，下面是双线程实现的屏保：

package com.example.screensaverdemo;

import java.util.Date;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
/**
 * 
 * @author Danxingxi created on 2015/11/29
 *
 */
public class MainActivity extends Activity {

	private Handler mHandler01 = new Handler();
	private Handler mHandler02 = new Handler();
	
	/* 上一次User有动作的Time Stamp */
	private Date lastUpdateTime;
	/* 计算User有几秒没有动作的 */
	private long timePeriod;
	
	/* 静止超过N秒将自动进入屏保 */
	private float mHoldStillTime = 10;
	/*标识当前是否进入了屏保*/
	private boolean isRunScreenSaver;
    
	/*时间间隔*/
	private long intervalScreenSaver = 1000;
	private long intervalKeypadeSaver = 1000;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		((Button)findViewById(R.id.start_screen_Saver)).setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent mService = new Intent(MainActivity.this, ScreenService.class);
				mService.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
				startService(mService);
			}
		});
		
		/* 初始取得User可触碰屏幕的时间 */
		lastUpdateTime = new Date(System.currentTimeMillis());
	}
	
	/**
	 * 计时线程
	 */
	private Runnable mTask01 = new Runnable() {
		
		@Override
		public void run() {
			Date timeNow = new Date(System.currentTimeMillis());
			/* 计算User静止不动作的时间间距 */
			/**当前的系统时间 - 上次触摸屏幕的时间 = 静止不动的时间**/
			timePeriod = (long) timeNow.getTime() - (long) lastUpdateTime.getTime();
			
			/*将静止时间毫秒换算成秒*/
			float timePeriodSecond = ((float) timePeriod / 1000);
			
			if(timePeriodSecond > mHoldStillTime){
				if(isRunScreenSaver == false){  //说明没有进入屏保
					/* 启动线程去显示屏保 */
					mHandler02.postAtTime(mTask02, intervalScreenSaver);
					/*显示屏保置为true*/
					isRunScreenSaver = true;
				}else{
					/*屏保正在显示中*/
				}
			}else{
				/*说明静止之间没有超过规定时长*/
				isRunScreenSaver = false;
			}
			/*反复调用自己进行检查*/
			mHandler01.postDelayed(mTask01, intervalKeypadeSaver);	
		}
	};
	
	/**
	 * 持续屏保显示线程
	 */
	private Runnable mTask02 = new Runnable() {

		@Override
		public void run() {
			// TODO Auto-generated method stub
			if (isRunScreenSaver == true) {  //如果屏保正在显示，就计算不断持续显示  
//				hideOriginalLayout();
				showScreenSaver();
				mHandler02.postDelayed(mTask02, intervalScreenSaver);
			} else {
				mHandler02.removeCallbacks(mTask02);  //如果屏保没有显示则移除线程
			}
		}
	};
	
	/**
	 * 显示屏保
	 */
	private void showScreenSaver(){
		Log.d("danxx", "显示屏保------>");
		Intent intent = new Intent(MainActivity.this, ScreenSaverActivity.class);
		startActivity(intent);
		
	}
	
	@Override
	public boolean dispatchKeyEvent(KeyEvent event) {
		updateUserActionTime();
		return super.dispatchKeyEvent(event);
	}
	
	/*用户有操作的时候不断重置静止时间和上次操作的时间*/
	public void updateUserActionTime() {
		Date timeNow = new Date(System.currentTimeMillis());
		timePeriod = timeNow.getTime() - lastUpdateTime.getTime();
		lastUpdateTime.setTime(timeNow.getTime());
	}
	
	@Override
	protected void onResume() {
		/*activity显示的时候启动线程*/
		mHandler01.postAtTime(mTask01, intervalKeypadeSaver);
		super.onResume();
	}
	
	@Override
	protected void onPause() {
		/*activity不可见的时候取消线程*/
		mHandler01.removeCallbacks(mTask01);
		mHandler02.removeCallbacks(mTask02);
		super.onPause();
	}
	
}

     屏保就是一个新的Activity，我们可以在屏保activity里接入展示广告，做任意操作，下面是启动一个服务，当用户按锁屏键锁屏的时候会发送一个广播，我们在服务中接受到广播后可以屏蔽系统的锁屏，显示我们自己的锁屏：

package com.example.screensaverdemo;

import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;

public class ScreenService extends Service {
	KeyguardManager mKeyguardManager = null;   
    private KeyguardLock mKeyguardLock = null;  
    BroadcastReceiver mMasterResetReciever;
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}
	 @Override   
	    public void onCreate() { 
	    	 //Log.e("ScreenService","onCreate()");
	        // TODO Auto-generated method stub 
	    	startScreenService();
	        super.onCreate();   
	      }   
	    
     @Override   
     public void onStart(Intent intent, int startId) {  
    	// Log.e("ScreenService","onStart");
        // TODO Auto-generated method stub   
    	 startScreenService();
      }
	     
     private void startScreenService(){
    	 mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);   
         mKeyguardLock = mKeyguardManager.newKeyguardLock("");
         
         
         mKeyguardLock.disableKeyguard();   
         
         //Intent.ACTION_SCREEN_OFF
         mMasterResetReciever = new BroadcastReceiver() {   
             @Override
				public void onReceive(Context context, Intent intent) {   
                 try { 
	                     Intent i = new Intent();   
	                     i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
	                     i.setClass(context, ScreenSaverActivity.class);                        
	                     context.startActivity(i); 
                 } catch (Exception e) {                     	
                     Log.i("mMasterResetReciever:", e.toString());   
                 }   
             }   
         };           
       registerReceiver(mMasterResetReciever, new IntentFilter(Intent.ACTION_SCREEN_OFF));   
     }
     
     @Override
 	public void onDestroy() {
 		//Log.e("ScreenService","onDestroy()");
 		super.onDestroy();
 		unregisterReceiver(mMasterResetReciever);  
         ScreenService.this.stopSelf();
     }
}

          1.Demo下载地址

    屏保Activity：

全局屏保实现思路：首先你要用service和广播来做开机启动，困难的就是要监听用户操作，只要有用户操作设备就要重置锁屏计时器，把你的锁屏计时器等一些操作放在service后台运行，做一下保活防止被杀死，至于监听用户的操作，由于是操作的别的app，只能通过Android设备的自动锁屏，拦截系统的自动锁屏跳出我们自己的屏保，两篇文章请参考：http://www.jb51.net/article/97067.htm 和 http://blog.youkuaiyun.com/mengweiqi33/article/details/18094221