後台Service通過廣播更新UI，Activity通過廣播停止Service

運行

點擊按鈕停止Service。

Activity如下：

package com.example.aandroidtest;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends PublicActivity {private TextView text;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                text = (TextView) this.findViewById(R.id.textView1);                //一個button，發送廣播，停止service中啟動的線程，以及停止service        Button button = (Button) this.findViewById(R.id.button1);        button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();intent.setAction("com.excample.stopService");sendBroadcast(intent);}});                        //註冊廣播，接收service中啟動的線程發送過來的資訊，同時更新UI        IntentFilter filter = new IntentFilter("com.example.updateUI");        this.registerReceiver(new MyBroadCaseReceiver(), filter);                //啟動service        Intent intent = new Intent(this, MyService.class);        this.startService(intent);    }        class MyBroadCaseReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context arg0, Intent intent) {int i = intent.getIntExtra("data", 0);text.setText(String.valueOf(i));}    }}

Service如下：

package com.example.aandroidtest;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.IBinder;public class MyService extends Service {boolean flag = true;//用於停止線程@Overridepublic IBinder onBind(Intent arg0) {return null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {//註冊receiver，接收Activity發送的廣播，停止線程，停止serviceIntentFilter filter = new IntentFilter();filter.addAction("com.excample.stopService");registerReceiver(new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {flag = false;stopSelf();//在service中停止service}}, filter);//啟動線程，每隔1s給廣播個資料，給Activity接收到，並更新UInew Thread(new MyThread()).start();return super.onStartCommand(intent, flags, startId);}class MyThread implements Runnable {int i = 100;public void run() {try {while(flag) {Thread.sleep(1000);Intent intent = new Intent("com.example.updateUI");intent.putExtra("data", i);sendBroadcast(intent);i++;}} catch (InterruptedException e) {e.printStackTrace();}}}}