后台Service通过广播更新UI,Activity通过广播停止Service
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运行如图:
点击按钮停止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); //一个button,发送广播,停止service中启动的线程,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);}}); //注册广播,接收service中启动的线程发送过来的信息,同时更新UI IntentFilter filter = new IntentFilter("com.example.updateUI"); this.registerReceiver(new MyBroadCaseReceiver(), filter); //启动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;//用于停止线程@Overridepublic IBinder onBind(Intent arg0) {return null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {//注册receiver,接收Activity发送的广播,停止线程,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);//启动线程,每隔1s给广播个数据,给Activity接收到,并更新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();}}}}
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