Activity与Service通信之BroadcastReceive

来源：互联网发布：max 软件下载编辑：程序博客网时间：2024/05/02 00:29

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：

[java] view plaincopyprint?

<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>

package com.gufengxiachen.broadcast;import android.app.Service;import android.content.Intent;import android.os.IBinder;public class LocalService extends Service{private int progress;@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onStart(Intent intent, int startId) {// TODO Auto-generated method stubsuper.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();}}

下面是Activity：

[java] view plaincopyprint?

<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>

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() {@Overridepublic 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);    }    }}

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。