Android service调用activity更新前台页面

package com.android.service; 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.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ProgressBar; import android.widget.TextView; public class MainActivity extends Activity implements OnClickListener { private Button start, stop, register, remove; private TestService mService; private ProgressBar progressBar; private TextView textView; private MyReceiver receiver; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initLayout(); setListeners(); } public void initLayout() { textView = (TextView)findViewById(R.id.tv); start = (Button)findViewById(R.id.start); stop = (Button)findViewById(R.id.stop); register = (Button)findViewById(R.id.register); remove = (Button)findViewById(R.id.remove); progressBar = (ProgressBar)findViewById(R.id.progress); } public void setListeners() { start.setOnClickListener(this); stop.setOnClickListener(this); register.setOnClickListener(this); remove.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.start: // 开始服务 startService(new Intent(MainActivity.this, TestService.class)); break; case R.id.stop: // 结束服务 stopService(new Intent(MainActivity.this, TestService.class)); break; case R.id.register: // 注册接收器 receiver = new MyReceiver(); IntentFilter filter = new IntentFilter(); filter.addAction("android.intent.action.test"); MainActivity.this.registerReceiver(receiver, filter); break; case R.id.remove: // 解除注册接收器 MainActivity.this.unregisterReceiver(receiver); break; default: break; } } public class MyReceiver extends BroadcastReceiver { // 自定义一个广播接收器 @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub System.out.println("OnReceiver"); Bundle bundle = intent.getExtras(); int a = bundle.getInt("i"); progressBar.setProgress(a); textView.setText(String.valueOf(a)); // 处理接收到的内容 } public MyReceiver() { System.out.println("MyReceiver"); // 构造函数，做一些初始化工作，本例中无任何作用 } } }