Android中Broadcast

 

    前一段时间，听说过android的广播，这段时间经过研究终于可以写出一个Demo

    首先新建一个android工程项目

   

在BroadCastActivity.java中

package com.mypack;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class BroadCastActivity extends Activity {
    private Button sendbtn;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        sendbtn=(Button)this.findViewById(R.id.button1);
        sendbtn.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                send();
            }
            
        });
    }
    public void send()
    {
        Intent intent=new Intent("android.intent.action.MY_BROADCAST");
        //标记作用的，广播接收器通过匹配"android.intent.action.MY_BROADCAST"接收发送的消息，在AndroidMainfest.xml中进行过滤匹配
        intent.putExtra("msg","chen liang");//发送的消息
        this.sendBroadcast(intent);//发送广播
    }
}

MyReceiver.java相当于接收器里面写成

package com.mypack;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.View;

public class MyReceiver extends BroadcastReceiver{
    private static final String TAG="MyReciver";
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        String msg=intent.getStringExtra("msg");//接收信息
        Log.i(TAG,msg);
    }
}

另外还要对广播进行注册，要说到注册有静态注册和动态注册两种方式，在这里我说的是静态注册
静态注册是在AndroidMainfest.xml中进行的

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mypack"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".BroadCastActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver  android:name=".MyReceiver">
            <intent-filter>
                <action android:name="android.intent.action.MY_BROADCAST"></action>
                <category android:name="android.intent.category.DEFAULT"></category>
            </intent-filter>
        </receiver>
    </application>

</manifest>

主要就是    <receiver  android:name=".MyReceiver">
            <intent-filter>
                <action android:name="android.intent.action.MY_BROADCAST"></action>
                <category android:name="android.intent.category.DEFAULT"></category>
            </intent-filter>
        </receiver>

这样就OK了

运行程序后

 

点击按钮后

OK