android Hander ?Service ?廣播的綜合使用案例

原理：在主activity里啟動一個服務，這個服務通過Handler每一秒發送一條廣播，并在主activity里注冊一個廣播接受者（BroadcastReceiver），這個廣播接收者的作用在于搜到server的廣播，并是的i加1，并且把i的值設置到textview,達到美妙加1的效果

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

Button button1;

Button button2;

TextView textView;

publicstatic int i = 0;

publicstatic Handler handler;

Intent? intent1;

MyBroadcastReceiver mybroadcast;

@Override

protectedvoid onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

button1 = (Button)findViewById(R.id.start);

button2 = (Button)findViewById(R.id.stop);

textView = (TextView)findViewById(R.id.number);

button1.setOnClickListener(new OnClickListener() {

@Override

publicvoid onClick(View v) {

handler= new Handler(){

@Override

publicvoid handleMessage(Message msg) {

super.handleMessage(msg);

sendBroadcast(new Intent().setAction("ACTION"));

this.sendEmptyMessageDelayed(1, 1000);

}

};

Log.d("--","-------------------" + "onclick_start");

intent1 =new Intent(MainActivity.this, MyService.class);

startService(intent1);

IntentFilter intentFilter =new IntentFilter();

mybroadcast =new MyBroadcastReceiver();

intentFilter.addAction("ACTION");

MainActivity.this.registerReceiver(mybroadcast, intentFilter);

}

});

button2.setOnClickListener(new OnClickListener() {

@Override

publicvoid onClick(View v) {

unregisterReceiver(mybroadcast);

stopService(intent1);

if(handler !=null){

handler.removeMessages(1);

handler =null;

}

}

});

}

class MyBroadcastReceiverextends BroadcastReceiver{

@Override

publicvoid onReceive(Context context, Intent intent) {

i++;

? ? ? ? if (intent.getAction().equals("android.intent.action.DATE_CHANGED")) { ?? ? ? ? ? ?

? ? ? ? } else if (intent.getAction().equals("ACTION")) { ?? ? ? ?

? ? ? ? }?

? ? ? ? textView.setText(i + "");

}

}

}

定義一個Service

import android.app.Service;

import android.content.Intent;

import android.os.IBinder;

public class MyService extends Service{

@Override

public IBinder onBind(Intent intent) {

returnnull;

}

@Override

publicvoid onCreate() {

super.onCreate();

}

@Override

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

MainActivity.handler.sendEmptyMessageDelayed(1, 1000);

returnsuper.onStartCommand(intent, flags, startId);

}

@Override

publicvoid onDestroy() {

super.onDestroy();

if(MainActivity.handler !=null){

MainActivity.handler.removeMessages(1);

MainActivity.handler =null;

}

}

}

</activity>

? ? ? ? <service android:name="com.example.myhandlertest.MyService"></service> ? //注意AndroidManifest.xml文件中必須加上這一行

? ? </application>

運行的效果圖：

總結

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