详解Android之本地广播的实例
来源：爱站网时间：2019-10-28编辑：网友分享
android系统都需要添加本地广播，当我们需要接收指定的广播时，可以通过注册广播来过滤目标广播，下面就由爱站技术频道小编给大家介绍详解Android之本地广播的实例吧！
android系统都需要添加本地广播，当我们需要接收指定的广播时，可以通过注册广播来过滤目标广播，下面就由爱站技术频道小编给大家介绍详解Android之本地广播的实例吧！
本地广播信息只能在应用程序内部传递，同时广播接收器也只能接收应用程序内部的广播消息。
MainActivity代码
package com.example.luobo.mybroadcastreceiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Button button;
private IntentFilter intentFilter;
private LocalBroadcastManager localBroadcastManager ;
private LocalReceiver localReciiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button)findViewById(R.id.send_button);
button.setOnClickListener(this);
localBroadcastManager = LocalBroadcastManager.getInstance(this);//使用
intentFilter = new IntentFilter();
intentFilter.addAction("com.example.luobo.mybroadcastreceiver.LOCAL_BROADCAST");
localReciiver = new LocalReceiver();
localBroadcastManager.registerReceiver(localReciiver,intentFilter);
}
@Override
protected void onDestroy() {
super.onDestroy();
localBroadcastManager.unregisterReceiver(localReciiver);
}
@Override
public void onClick(View view) {
Intent intent = new Intent("com.example.luobo.mybroadcastreceiver.LOCAL_BROADCAST");
localBroadcastManager.sendBroadcast(intent);
}
class LocalReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"received local broadcast",Toast.LENGTH_SHORT).show();
}
}
}
首先通过LocalBroadcastManager（本地广播管理类）的getInstance(this)方法获取实例，注册广播消息时是调用localBroadcastManager实例的registerReceiver(参数1,参数2)方法注册（参数1是本地广播接受者，参数2是过滤器只选择接收特定的广播消息），调用localBroadcastManager实例的sendBroadcast（Initent initent）方法发送广播消息。
MyRecevity
package com.example.luobo.mybroadcastreceiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"Received in MyBroadCastReceiver",Toast.LENGTH_SHORT).show();
abortBroadcast();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.luobo.mybroadcastreceiver.MainActivity">
<Button
android:id="@+id/send_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="发送广播"/>
</android.support.constraint.ConstraintLayout>
AndroidMainfest.aml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.luobo.mybroadcastreceiver">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".MyReceiver"
android:enabled="true"
android:exported="true">
<intent-filter
android:priority="100">
<action android:name="com.example.luobo.mybroadcastreceiver.LOCAL_BROADCAST"/>
</intent-filter>
</receiver>
</application>
</manifest>
以上这些是爱站技术频道小编给大家介绍的详解Android之本地广播的实例，想了解更多Android知识的朋友，敬请留意js.aizhan.com!
