BroadcastReceiver实现唤起已关闭应用的功能

实现的功能：监听屏幕解锁，唤起未开启的应用

特别注明：
在Android3.1以后，系统对广播接受进行了新的限制：

1. 如果是新应用，需要手动开启一次才能接收到广播。
2. 如果应用被用户从“后台进程管理器”中杀死，也将无法接收到广播。
3. 不能静态注册的广播包含：
   a.android.intent.action.SCREEN_ON
   b.android.intent.action.SCREEN_OFF
   c.android.intent.action.BATTERY_CHANGED
   d.android.intent.action.CONFIGURATION_CHANGED
   e.android.intent.action.TIME_TICK
   网址：
   https://developer.android.google.cn/reference/android/content/Intent.html

功能实现思路：
在Activity中，开启一个Service；在该Service中开启一个BroadcaseReceiver，实现监听屏幕解锁功能。

Service实现类：

public class BroadCastReceiverService extends Service {    private Context context;    private Intent intentActivity;    public BroadCastReceiverService(){    }    @Nullable    @Override    public IBinder onBind(Intent intent) {        return null;    }    @Override    public void onCreate() {        super.onCreate();        intentActivity = new Intent();        intentActivity.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        intentActivity.setClass(BroadCastReceiverService.this,SecondActivity.class);        /* 注册屏幕唤醒时的广播 */        IntentFilter mScreenOnFilter = new IntentFilter("android.intent.action.SCREEN_ON");        BroadCastReceiverService.this.registerReceiver( screenOnBroadCaseReceive, mScreenOnFilter);    }    ScreenOnBroadCaseReceive screenOnBroadCaseReceive = new ScreenOnBroadCaseReceive();    @Override    public void onDestroy() {        super.onDestroy();        BroadCastReceiverService.this.unregisterReceiver(screenOnBroadCaseReceive);        startService(new Intent(context,BroadCastReceiverService.class));    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        return Service.START_STICKY;    }    class ScreenOnBroadCaseReceive extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            if (action.equals("android.intent.action.SCREEN_ON")){                startActivity(intentActivity);            }        }    }    //记住Service要在Manifest当中注册

MainActivity类：

public class MainActivity extends AppCompatActivity {    private Button buttonClick;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        buttonClick = (Button) findViewById(R.id.buttonClick);        buttonClick.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent serviceIntent = new Intent();                serviceIntent.setClass(MainActivity.this,BroadCastReceiverService.class);                MainActivity.this.startService(serviceIntent);            }        });    }    @Override    protected void onDestroy() {        super.onDestroy();        Toast.makeText(this,"onDestroy",Toast.LENGTH_LONG).show();    }}

参考：
http://www.cnblogs.com/xxq1991/p/3688492.html
https://developer.android.google.cn/reference/android/content/Intent.html