Activity与Service通信之BroadcastReceive
来源:互联网 发布:c语言字符数组长度 编辑:程序博客网 时间:2024/04/28 14:29
上一篇演示了使用Bound Service实现Activity与Service之间的通信,实现了在Activity中很容易调用Service中的方法,但如果需要在Activity中得到Service中某个变量的变化,就比较费劲了,如果遇到这样的需求,使用广播是很好的选择!
下面演示在Activity中如何得到Service中某个变量的变化以更新Activity的UI。
先看Service:
<span style="font-size:18px;">package com.gufengxiachen.broadcast;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
public class LocalService extends Service{
private int progress;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
super.onStart(intent, startId);
//得到Activity中传递过来的数据
progress = intent.getIntExtra("progress", 0);
//创建一个线程,每隔一秒向Activity发送一个广播,并将progress的新值发送出去
new Thread(){
public void run() {
while(progress<100){
progress = progress+1;
Intent intent = new Intent();
intent.putExtra("serviceProgress", progress);
//设置发送广播的类型,可以随便写一个
intent.setAction("com.gufengxiachen.service");
sendBroadcast(intent);
try {
sleep(1000);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}.start();
}
}
</span>
下面是Activity:
- <span style="font-size:18px;">package com.gufengxiachen.broadcast;
- 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.SeekBar;
- import android.widget.SeekBar.OnSeekBarChangeListener;
- public class BroadcastReceiverTestActivity extends Activity {
- private ProgressBar progressBar;
- private Button button;
- private int progress = 0;
- private MyBroadcastReceiver myBroadcastReceiver = new MyBroadcastReceiver();
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- progressBar = (ProgressBar)findViewById(R.id.progressBar);
- button = (Button)findViewById(R.id.button);
- progressBar.setMax(100);
- button.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- //在这里启动服务
- Intent intent = new Intent();
- intent.putExtra("progress", progress);
- intent.setClass(BroadcastReceiverTestActivity.this, LocalService.class);
- startService(intent);
- }
- });
- }
- @Override
- protected void onResume() {
- // TODO Auto-generated method stub
- super.onResume();
- //注册广播接收器
- IntentFilter filter = new IntentFilter();
- //设置接收广播的类型,这里要和Service里设置的类型匹配,还可以在AndroidManifest.xml文件中注册
- filter.addAction("com.gufengxiachen.service");
- this.registerReceiver(myBroadcastReceiver, filter);
- }
- @Override
- protected void onStop() {
- // TODO Auto-generated method stub
- super.onStop();
- this.unregisterReceiver(myBroadcastReceiver);
- }
- //定义一个广播接收器
- class MyBroadcastReceiver extends BroadcastReceiver{
- @Override
- public void onReceive(Context context, Intent intent) {
- // TODO Auto-generated method stub
- //接收到Service发送的广播信息,得到数据,更新UI
- progress = intent.getIntExtra("serviceProgress", 0);
- progressBar.setProgress(progress);
- }
- }
- }</span>
运行的效果就是,每隔一秒Service发送一个广播,同时广播接收器接收广播,得到数据,更新UI。
- Activity与Service通信之BroadcastReceive
- Activity与Service通信之BroadcastReceive
- Activity与Service通信之BroadcastReceive
- Activity与Service通信之BroadcastReceive
- Activity与Service通信之BroadcastReceive
- Activity与Service通信之BroadcastReceive
- Activity与Service通信之Bound Service
- Android之Activity与Service通信
- Android之Activity与Service通信
- Android之Activity与Service通信
- Android之Activity与Service通信
- Android之Activity与Service通信
- service与activity通信 之 bindService
- Android之Activity与Service通信
- Android之Activity与Service通信
- Android之Service与Activity通信机制
- Android之Service与Activity通信机制
- Activity与Service通信之ResultReceiver
- 抢食CDN市场 电信巨头联手“去电信化”
- Java 设计模式之观察者模式
- Java第一天
- java中栈和队列的操作
- 实现圆形的ImageView
- Activity与Service通信之BroadcastReceive
- HDU 1566 Color the ball(树状数组or线段树)
- 一些常用的几何相关在线计算工具
- Touch
- 一个计算机爱好者的不完整回忆(五十四)最高的荣誉
- 深入理解C++虚函数
- 机器学习--决策树(ID3)算法
- 分治法实现全排列
- Python 看书笔记(1)