這篇文章主要介紹了Android中如何使用本地廣播的相關知識,內容詳細易懂,操作簡單快捷,具有一定借鑒價值,相信大家閱讀完這篇Android中如何使用本地廣播文章都會有所收獲,下面我們一起來看看吧。
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用localBroadcastManager實例的registerReceiver(參數1,參數2)方法注冊(參數1是本地廣播接受者,參數2是過濾器只選擇接收特定的廣播消息),調用localBroadcastManager實例的sendBroadcast(Initent initent)方法發送廣播消息。
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>
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