互联网连接更改时自动重新加载Webview

Question

当连接恢复时，我想运行此任务，我想调用NewortchangeReceiver（）构造函数。我在Mainactivity IntentFilter中写了“ android.net.conn.CONNECTIVITY_CHANGE”，因为“ android.net.conn.CONNECTIVITY_CHANGE”在android N（7）的androidmanifest.xml中不起作用。我想在互联网连接更改时自动重新加载webview。protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    wvDailyDarshan = (WebView) findViewById(R.id.wvDailyDarshan);    progressBar = (ProgressBar) findViewById(R.id.progressBar);    IntentFilter intentFilter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");    context.registerReceiver(new NetworkChangeReceiver(), intentFilter);    Boolean connection = isNetworkConnected();    if (connection == false) {        Snackbar.make(this.getWindow().getDecorView().findViewById(android.R.id.content), "Please check your Internet Connection", Snackbar.LENGTH_SHORT).show();    } else if (connection == true) {        wvDailyDarshan.getSettings().setJavaScriptEnabled(true);        //wvDailyDarshan.loadUrl("http://www.swaminarayanbhagwan.com/daily-darshan/");        wvDailyDarshan.setWebViewClient(new myWebClient());        wvDailyDarshan.getSettings().setJavaScriptEnabled(true);        wvDailyDarshan.getSettings().setBuiltInZoomControls(true);        wvDailyDarshan.getSettings().setDisplayZoomControls(false);        wvDailyDarshan.loadUrl("https://www.google.co.in/");    }}

Answer 1

我从您的问题中得到的是，当连接性发生变化时，您希望获得回调。所以我会回答。

NetworkChangeReceiver：

public class NetworkChangeReceiver extends BroadcastReceiver {

    ConnectionChangeCallback connectionChangeCallback;

    @Override

    public void onReceive(Context context, Intent intent) {

        ConnectivityManager cm = (ConnectivityManager) context

                .getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

        boolean isConnected = activeNetwork != null

                && activeNetwork.isConnectedOrConnecting();

        if (connectionChangeCallback != null) {

            connectionChangeCallback.onConnectionChange(isConnected);

        }

    }

    public void setConnectionChangeCallback(ConnectionChangeCallback

                                                    connectionChangeCallback) {

        this.connectionChangeCallback = connectionChangeCallback;

    }

    public interface ConnectionChangeCallback {

        void onConnectionChange(boolean isConnected);

    }

}

现在，您的Activity应该在BraodCastReceiver上调用setConnectionChangeCallback，即NetworkChangeReceiver的对象，并提供ConnectionChangeCallback的实现。

可能看起来像这样。活动：

public class YourActivity implments NetworkChangeReceiver.ConnectionChangeCallback

{

@Override

    protected void onCreate(Bundle savedInstanceState) {

        .....

        IntentFilter intentFilter = new 

        IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");

        NetworkChangeReceiver networkChangeReceiver = new NetworkChangeReceiver();

        registerReceiver(networkChangeReceiver, intentFilter);

        networkChangeReceiver.setConnectionChangeCallback(this);

    }

    @Override

    public void onConnectionChange(boolean isConnected) {

    if(isConnected){

    // will be called when internet is back

    }

    else{

    // will be called when internet is gone.

    }

    }

}