首先，創(chuàng)建一個(gè)名為 NetworkChangeReceiver 的類(lèi)，如下所示：
public class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
ConnectivityManager connectivityManager
= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
if ( activeNetworkInfo != null && activeNetworkInfo.isConnected()) {
Toast.makeText(context, "Network is back", Toast.LENGTH_SHORT).show();
}
}
}
每次網(wǎng)絡(luò)發(fā)生變化時(shí)，此類(lèi)都會(huì)收到通知，并且函數(shù)中的代碼onReceive會(huì)檢查我們是否在線。
下一個(gè)，
在您的清單中添加<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 并告訴 Android 您想要過(guò)濾此類(lèi)事件。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test">
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<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">
<receiver android:name=".NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
接下來(lái)在您的主要活動(dòng)中注冊(cè)這些事件
private BroadcastReceiver mNetworkReceiver;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNetworkReceiver = new NetworkChangeReceiver();
registerReceiver(mNetworkReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(mNetworkReceiver);
}
