service后臺開線程及廣播做一個計時器

怎樣用service后臺開線程及廣播做一個計時器？這篇文章分別介紹了后臺開線程和廣播做一個計時器的方法，代碼示例非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下。

1.首先寫一個服務(wù)，在onStartCommand方法里開啟線程，每次startService就會調(diào)一次onStartCommand方法

import java.util.List;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.app.Service;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.media.MediaPlayer;

import android.os.Binder;

import android.os.Handler;

import android.os.IBinder;

import android.util.Log;

public class LocalService extends Service {

public static final String ACTION = "com.happyparking.service.LocalService";

private static final String TAG = "LocalService";

private IBinder binder = new LocalService.LocalBinder();

final Handler handler = new Handler();

int lastTime = 0;

boolean running = false;

Intent intent = new Intent(); // Itent就是我們要發(fā)送的內(nèi)容

Runnable runnable = new Runnable() {

@Override

public void run() {

Log.e(TAG, "線程，" + "倒計時=" + lastTime);

handler.postDelayed(this, 1000);// 50是延時時長

lastTime = lastTime - 1;

intent.putExtra("time", lastTime);

intent.setAction(Configs.Time_Action); // 設(shè)置你這個廣播的action，只有和這個action一樣的接受者才能接受者才能接收廣播

sendBroadcast(intent);

if (lastTime <= 0) {

Log.e(TAG, "結(jié)束.....");

handler.removeCallbacks(this);

running = false;

}

}

};

@Override

public IBinder onBind(Intent intent) {

return binder;

}

@Override

public void onCreate() {

Log.e(TAG, "onCreate");

// 這里可以啟動媒體播放器

// if(mediaPlayer==null)

// mediaPlayer=MediaPlayer.create(this, uri);

super.onCreate();

}

@Override

public void onStart(Intent intent, int startId) {

super.onStart(intent, startId);

}

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

Log.e(TAG, "onStartCommand");

if (running)

handler.removeCallbacks(runnable);

if(intent!=null)

lastTime = intent.getIntExtra("time", 0);

handler.postDelayed(runnable, 1000);

running = true;

Log.e(TAG, "onStart" + "開始倒計時=" + lastTime);

return START_STICKY;

}

@Override

public void onDestroy() {

Log.e(TAG, "onDestroy");

// handler.removeCallbacks(runnable);

stopSelf();

super.onDestroy();

}

// 定義內(nèi)容類繼承Binder

public class LocalBinder extends Binder {

// 返回本地服務(wù)

public LocalService getService() {

return LocalService.this;

}

}

}

2.在清單文件里面注冊廣播

  <service android:name="com.happyparking.service.LocalService" >

            <intent-filter>

                <action android:name="com.happyparking.service.LocalService" />

            </intent-filter>

        </service>

3.在activity或者片段里面寫廣播，接收條件，注冊廣播，記得推出界面后注銷廣播

private void initReceiver() {

timeReceiver = new TimeReceiver();

IntentFilter filter = new IntentFilter();

filter.addAction(Configs.Time_Action); // 只有持有相同的action的接受者才能接收此廣播

getActivity().registerReceiver(timeReceiver, filter);

}

public class TimeReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context arg0, Intent intent) {

// TODO Auto-generated method stub

if (intent != null) {//在這里面接收信息

}

}

//注銷廣播

@Override

public void onDestroy() {

// TODO Auto-generated method stub

super.onDestroy();

getActivity().unregisterReceiver(timeReceiver);

}

4.開啟廣播，可以帶入信息，第一次會啟動onStart，此后不再啟動onStart，但onStartCommand每次都會開啟：

public void sendMyService() {

Intent service = new Intent(LocalService.ACTION);//LocalService.ACTION是廣播條件

service.putExtra("time", second);//帶入信息，

// ((MainActivity)content).startMyService(10,(TextView)mMenuView.findViewById(R.id.tvTime));

content.startService(service);

}

以上就是service后臺開線程及廣播做一個計時器的具體操作，代碼應(yīng)該是足夠清楚的，而且我也相信有相當(dāng)?shù)囊恍├涌赡苁俏覀內(nèi)粘９ぷ骺赡軙姷玫降摹Ｍㄟ^這篇文章，希望你能收獲更多。