Android--启动广播(Broadcast)

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1.定义广播组件,组件类型继承BroadcastReceiver类:

package org.lxh.demo;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;public class MyBroadcastReceiverUtil extends BroadcastReceiver {public MyBroadcastReceiverUtil(){       System.out.println("***每次广播都会实例化一个新的广播组件进行操作!");}@Overridepublic void onReceive(Context context, Intent intent) {//注意参数Toast.makeText(context, "广播已经启动", Toast.LENGTH_LONG).show();}}

2.main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <Button        android:id="@+id/mybtn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="开始广播" /></LinearLayout>

3.定义Activity程序发送广播:

package org.lxh.demo;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class Hello extends Activity {private Button mybtn = null;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); // 生命周期方法super.setContentView(R.layout.main); // 设置要使用的布局管理器this.mybtn = (Button) super.findViewById(R.id.mybtn);this.mybtn.setOnClickListener(new OnClickListenerImpl());}private class OnClickListenerImpl implements OnClickListener {public void onClick(View arg0) {Intent it = new Intent(Intent.ACTION_EDIT);Hello.this.sendBroadcast(it);}}}

4.在AndroidManifest.xml文件中注册广播组件:

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="org.lxh.demo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="10" />    <application        android:icon="@drawable/icon"        android:label="@string/app_name" >        <activity            android:name=".Hello"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <strong><span style="color:#ff0000;"><receiver            android:name="MyBroadcastReceiverUtil"            android:enabled="true" >            <intent-filter>                <action android:name="android.intent.action.EDIT" />            </intent-filter>        </receiver></span></strong>    </application></manifest>
5.运行实例如下:



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