Android学习笔记之广播意图及广播接收者MyBroadcastReceiver、Broadcast

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（1）第一种使用xml文件进行注册

布局文件，添加一个button点击的时候进行广播

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MainActivity" ><Buttonandroid:id="@+id/button1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_alignParentTop="true"android:layout_marginLeft="68dp"android:layout_marginTop="82dp"android:text="Button" /></RelativeLayout>

MainActivity.java

package com.lc.broadcastreceiver_demo;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;import com.example.broadcastreceiver_demo.R;/** 使用xml文件注册的广播接受者，需要在清单文件中注册* <receiver android:name="com.lc.broadcastreceiver_demo.MyBroadcastReceiver" ><intent-filter><action android:name="com.freedie.broadcast" /></intent-filter></receiver>*/
public class MainActivity extends Activity {private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button = (Button) this.findViewById(R.id.button1);/** 当按钮点击的时候*/button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (R.id.button1 == v.getId()) {Intent intent = new Intent();intent.setAction("com.freedie.broadcast");sendBroadcast(intent); // 发送广播意图}}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}}

MyBroadcastReceiver.java广播的接受者，要继承BroadcastReceiver类，并且重载onReceive方法：

package com.lc.broadcastreceiver_demo;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;/** 广播接受者，当广播接受者受到广播意图的时候，onReceive回调方法就会执行*/
public class MyBroadcastReceiver extends BroadcastReceiver {private static final String TAG = "MyBroadcastReceiver";@Overridepublic void onReceive(Context context, Intent intent) {if ("com.freedie.broadcast".equals(intent.getAction())) {Log.d(TAG, "com.freedie.broadcast Intent was receiverd!");}}}

在清单文件中要注册一个广播：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.broadcastreceiver_demo"android:versionCode="1"android:versionName="1.0" ><uses-sdkandroid:minSdkVersion="8"android:targetSdkVersion="18" /><applicationandroid:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name="com.lc.broadcastreceiver_demo.MainActivity"android:label="@string/app_name" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><!-- 对MyBroadcastReceiver进行相关注册 --><receiver android:name="com.lc.broadcastreceiver_demo.MyBroadcastReceiver" ><intent-filter><action android:name="com.freedie.broadcast" /></intent-filter></receiver></application></manifest>

（2）第二种使用Java代码来注册

布局文件不变（含有一个button当点击的时候进行广播）、清单文件不许操作、MyBroadcastReceiver.java文件不变，只适用于测试是否接收成功！：

MainActivity.java

package com.example.broadcastreceiver_javacode;import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;public class MainActivity extends Activity {private Button button;private MyBroadcastReceiver myBroadcastReceiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button = (Button) this.findViewById(R.id.button1);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (R.id.button1 == v.getId()) {Intent intent = new Intent();intent.setAction("com.freedie.brodcast");sendBroadcast(intent); // 发送广播}}});}/** 在这里注册一个广播程序*/@Overrideprotected void onResume() {super.onResume();myBroadcastReceiver = new MyBroadcastReceiver();// 意图过滤器IntentFilter filter = new IntentFilter();filter.addAction("com.freedie.brodcast");// 对广播接受者进行注册registerReceiver(myBroadcastReceiver, filter);}/** 对广播接受者进行注销*/@Overrideprotected void onStop() {super.onStop();unregisterReceiver(myBroadcastReceiver);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}}

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