Android學習之本地廣播使用方法詳解

更新時間：2017年08月09日 10:06:26 作者：天秤心已隨風去

這篇文章主要為大家詳細介紹了Android學習之本地廣播使用方法，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本地廣播信息只能在應用程序內(nèi)部傳遞，同時廣播接收器也只能接收應用程序內(nèi)部的廣播消息。

MainActivity代碼

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();
    }
  }
}

首先通過LocalBroadcastManager（本地廣播管理類）的getInstance(this)方法獲取實例，注冊廣播消息時是調(diào)用localBroadcastManager實例的registerReceiver(參數(shù)1,參數(shù)2)方法注冊（參數(shù)1是本地廣播接受者，參數(shù)2是過濾器只選擇接收特定的廣播消息），調(diào)用localBroadcastManager實例的sendBroadcast（Initent initent）方法發(fā)送廣播消息。

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="發(fā)送廣播"/>

</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>

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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