在main.xml中：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:gravity="center_horizontal">
<Button
android:id="@+id/mybut"
android:layout_marginTop="8dp"
android:layout_width="80dp"
android:layout_height="40dp"
android:textColor="#ffffff"
android:background="#3399ff"
android:text="开始广播"/>
</LinearLayout>
新建MyBroadCastReceviceUtil.java:
package com.li.broadcastproject;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class MyBroadCastReceviceUtil extends BroadcastReceiver {
public MyBroadCastReceviceUtil() { // 构造方法
System.out.println("** 每次广播都会实例化一个新的广播组件进行操作。");
}
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "广播已经启动", Toast.LENGTH_SHORT).show();
}
}
在MyBroadcastDemo.java中：
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 MyBroadcastDemo extends Activity {
private Button mybut = null ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.mybut = (Button) super.findViewById(R.id.mybut);
this.mybut.setOnClickListener(new OnClickListenerImpl()) ;
}
private class OnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
Intent it = new Intent(Intent.ACTION_EDIT); // 操作的过滤
MyBroadcastDemo.this.sendBroadcast(it) ;
}
}
}
修改AndroidManifest.xml：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.li.broadcastproject"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MyBroadcastDemo"
android:label="@string/title_activity_my_broadcast" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".MyBroadCastReceviceUtil"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.EDIT" />
</intent-filter>
</receiver>
</application>
</manifest>
广播也可以根据系统的需要而自行启动。