时间:2021-05-19
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>以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
声明:本页内容来源网络,仅供用户参考;我单位不保证亦不表示资料全面及准确无误,也不保证亦不表示这些资料为最新信息,如因任何原因,本网内容或者用户因倚赖本网内容造成任何损失或损害,我单位将不会负任何法律责任。如涉及版权问题,请提交至online#300.cn邮箱联系删除。
Android中onSaveInstanceState()使用方法详解覆盖onSaveInstanceState方法,并在onCreate中检测savedIns
本文实例为大家分享了Android学习之Broadcast的使用方法,供大家参考,具体内容如下实现开机启动提示网络的广播packagecom.example.l
Android中Context的使用方法详解概要:Context字面意思是上下文,位于frameworkpackage的android.content.Cont
Android中RxPermissions的使用方法详解以请求拍照、读取位置权限为例module的build.gradle:compile'com.tbruye
Android中的Intent是一个非常重要的类,如果对Intent不是特别了解,可以参见《详解Android中Intent的使用方法》。如果对IntentFi