android本地广播不生效,Android学习之本地广播使用方法详解
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
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">
android:id="@+id/send_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="发送广播"/>
AndroidMainfest.aml
package="com.example.luobo.mybroadcastreceiver">
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">
android:name=".MyReceiver"
android:enabled="true"
android:exported="true">
android:priority="100">
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脚本之家。