Android学习之本地广播的使用

最新推荐文章于 2024-11-07 22:55:09 发布

李勇123456

最新推荐文章于 2024-11-07 22:55:09 发布

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分类专栏： android学习笔记文章标签： android

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本文介绍了一个简单的本地广播实现案例，包括如何使用LocalBroadcastManager进行广播的发送与接收。通过具体的MainActivity代码展示了广播注册、发送的过程，并提供了MyReceiver的实现方式。

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本地广播

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>