android基础：广播BroadCast简单案例

运行效果



string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="app_name">TestBroadcast</string>
<string name="param_input">请输入发送参数</string>
<string name="send_button">发送广播</string>
<string name="action_settings">Settings</string>
</resources>

activity_main.xml

<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="com.mytest.testbroadcast.MainActivity" >

<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="@string/param_input"
android:id="@+id/param_input"/>
<Button
android:id="@+id/send_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/param_input"
android:text="@string/send_button"
android:onClick="SendBroadCast" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/param_input"
android:text="@null"
android:id="@+id/view_result"
/>

</RelativeLayout>

　

MainActivity　

package com.mytest.testbroadcast;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

private EditText paramText;
private TextView resultView;
private final String ACTION_INTENT_TEST="com.mytest.testbroad.intent";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

paramText = (EditText) this.findViewById(R.id.param_input);
resultView = (TextView) this.findViewById(R.id.view_result);
}

/**
* 发送广播按钮onclick事件
* @param view
*/
public void SendBroadCast(View view){
String param = paramText.getText().toString();

//创建发送intent
Intent intent = new Intent(this.ACTION_INTENT_TEST);
//绑定参数
intent.putExtra("user_input", param);
//发送广播
this.sendBroadcast(intent);

resultView.setText("发送广播成功，参数值为:"+param);

}

}

　

创建广播接听对象

package com.mytest.testbroadcast;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyBroadCastReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String user_input = intent.getStringExtra("user_input");
Toast.makeText(context,"接收到广播，得到参数值为"+user_input,Toast.LENGTH_SHORT).show();

}

}

　　

　AndroidMainfest.xml

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

<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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>
<!-- 注册广播接收类 -->
<receiver android:name=".MyBroadCastReceiver">
<intent-filter>
<action android:name="com.mytest.testbroad.intent"/>
</intent-filter>

</receiver>
</application>

</manifest>

　　

案例实现小结：
1、定义ACTION,并建立发送Intent，调用sendBroadcast方法发送广播；
2、创建广播接收类。类要继承BroadcastReceiver，并重写onReceive方法；
3、在AndroidManifest.xml中注册广播接收对象，在intent-filter中添加ACTION。