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本文實(shí)例為大家分享了Android學(xué)習(xí)之Broadcast的使用方法,供大家參考,具體內(nèi)容如下
實(shí)現(xiàn)開機(jī)啟動(dòng)提示網(wǎng)絡(luò)的廣播
package com.example.luobo.broadcasttest; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private IntentFilter intentFilter; private NetworkChangeReceiver networkChangeReceiver; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); intentFilter = new IntentFilter();//創(chuàng)建一個(gè)過濾器實(shí)例 intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");//添加接收CONNECTIVITY_CHANGE消息 networkChangeReceiver = new NetworkChangeReceiver(); registerReceiver(networkChangeReceiver,intentFilter); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(networkChangeReceiver); } class NetworkChangeReceiver extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);//通過此方法獲取ConnectivityManager實(shí)例 NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();//調(diào)用實(shí)例connectivityManager的getActiveNetworkInfo()方法獲取NetworkInfo實(shí)例 if (networkInfo != null && networkInfo.isAvailable()){ Toast.makeText(context,"Network is available",Toast.LENGTH_SHORT).show(); }else { Toast.makeText(context,"Network is unavailable",Toast.LENGTH_SHORT).show(); } } } }
創(chuàng)建BootCompleteReceiver類
右擊com.example.luobo.broadcasttest,New->Other->Broadcast,輸入名字BootCompleteReceiver,勾選Enable,Exported,重寫onReceive()方法。由于使用的是快捷方式創(chuàng)建的類,所需權(quán)限會(huì)在AndroidManifest.xml中自動(dòng)注冊(cè)。標(biāo)簽為receiver,但是還不夠修改。
package com.example.luobo.broadcasttest; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.widget.Toast; public class BootCompleteReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context,"Boot Complete",Toast.LENGTH_SHORT).show(); } }
在AndroidMaifest.xml注冊(cè)權(quán)限
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.luobo.broadcasttest"> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />//注冊(cè)接收網(wǎng)絡(luò)消息廣播 <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>//注冊(cè)接收開機(jī)啟動(dòng)廣播 <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=".BootCompleteReceiver" android:enabled="true" android:exported="true"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED"/>//開機(jī)時(shí)系統(tǒng)會(huì)發(fā)一條此廣播 </intent-filter> </receiver> </application> </manifest>
上述在AndroidMainfest.xml中注冊(cè)接收廣播消息屬于靜態(tài)注冊(cè),在OnCreate()中注冊(cè)的接收廣播屬于動(dòng)態(tài)注冊(cè)。
以上就是本文的全部內(nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持億速云。
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