Android -- Activity 、Service、BroadcastReceiver 结合使用

动态改变UI界面：

Activity：

public class MainActivity extends Activity implements OnClickListener {
private BroadcastReceiver br = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int val = intent.getIntExtra("name", 0);
tv.setText(val + "");
}
};
private Button startbtn, stopbtn;
private TextView tv;
private Intent i;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 动态注册
registerReceiver(br, new IntentFilter("Action1"));
startbtn = (Button) findViewById(R.id.start);
stopbtn = (Button) findViewById(R.id.stop);
tv = (TextView) findViewById(R.id.tv);
startbtn.setOnClickListener(this);
stopbtn.setOnClickListener(this);
i = new Intent(MainActivity.this, MyService.class);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.start:
startService(i);
break;
case R.id.stop:
stopService(i);
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(br);// 取消注册
}
}

Service：

public class MyService extends Service {
private Timer timer;
private TimerTask task;
private int j = 0;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
startTimer();
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
stopTimer();
super.onDestroy();
}
public void startTimer() {
timer = new Timer();
task = new TimerTask() {
@Override
public void run() {
j++;
Intent i = new Intent();
i.setAction("Action1");
i.putExtra("name", j);
sendBroadcast(i);
}
};
timer.schedule(task, 1000, 1000);
}
public void stopTimer() {
timer.cancel();
}
}

服务一定要记得在配置文件中注册，广播动态注册

运行结果：







本文出自 “天马行空” 博客，请务必保留此出处http://shaotao.blog.51cto.com/7606729/1290943