Question

我必须在设备连接到互联网时显示通知我是否需要一直为此服务？

Answer 1

ConnectivityReceiver.java

public class ConnectivityReceiver
    extends BroadcastReceiver {

public static ConnectivityReceiverListener connectivityReceiverListener;

public ConnectivityReceiver() {
    super();
}

@Override
public void onReceive(Context context, Intent arg1) {
    ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    boolean isConnected = activeNetwork != null
            && activeNetwork.isConnectedOrConnecting();

    if (connectivityReceiverListener != null) {
        connectivityReceiverListener.onNetworkConnectionChanged(isConnected);
    }
}

public static boolean isConnected() {
    ConnectivityManager
            cm = (ConnectivityManager) MyApplication.getInstance().getApplicationContext()
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    return activeNetwork != null
            && activeNetwork.isConnectedOrConnecting();
}


public interface ConnectivityReceiverListener {
    void onNetworkConnectionChanged(boolean isConnected);
}}

MyApplication.java

public class MyApplication extends Application {

private static MyApplication mInstance;

@Override
public void onCreate() {
    super.onCreate();

    mInstance = this;
}

public static synchronized MyApplication getInstance() {
    return mInstance;
}

public void setConnectivityListener(ConnectivityReceiver.ConnectivityReceiverListener listener) {
    ConnectivityReceiver.connectivityReceiverListener = listener;
}}

的AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<application
    android:name=".MyApplication"
    android:allowBackup="true"
    ...
<receiver
        android:name=".ConnectivityReceiver"
        android:enabled="true">
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        </intent-filter>
    </receiver>
...
</application>

Activity.class

public class MainActivity extends AppCompatActivity
    implements ConnectivityReceiver.ConnectivityReceiverListener {
...
@Override
protected void onResume() {
    super.onResume();

    // register connection status listener
    MyApplication.getInstance().setConnectivityListener(this);
}
...
@Override
public void onNetworkConnectionChanged(boolean isConnected) {
if(isConnected){
Toast.makeText(context, "Internet Connected", Toast.LENGTH_SHORT).show();
}else{Toast.makeText(context, "Internet not Connected", Toast.LENGTH_SHORT).show();}   
}}

Answer 2

您需要广播接收器才能接收网络状态更改，然后将此数据传递给不是绑定服务的服务并创建通知，或者您可以在广播接收器中创建通知。

Answer 3

您不必运行服务来检查连接更改。

您可以使用android.net.conn.CONNECTIVITY_CHANGE意图注册广播接收器。

请注意

针对Android 7.0（API级别24）及更高版本的应用无法接收这个广播，如果他们宣布广播接收器在他们的表现。如果应用程序注册，他们仍会收到广播带有Context.registerReceiver（）的BroadcastReceiver和那个上下文是仍然有效。

链接了解更多信息： https://developer.android.com/reference/android/net/ConnectivityManager.html#CONNECTIVITY_ACTION

类似的问题：https://stackoverflow.com/a/2295044/2174489

如何在互联网连接上显示通知？

3 个答案: