互联网连接改变时自动重新加载 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。 我想在互联网连接改变时自动重新加载 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，您希望在连接发生变化时获得回调。 所以我会回答这个问题。

网络变更接收器：

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。

这可能看起来像这样。 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.
    }

    }
}

Answer 2

您可以创建一个新方法，如果未连接互联网，它将自行调用。 下面是一个粗略的例子。 将其更改为更有效的方式。

private boolean shoudShowSnackbar = true;

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);

    doThisThingIfFoundInternet();
}

private void doThisThingIfFoundInternet() {
    if (isNetworkConnected()) {
        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/");
    }else{
        if (this.shoudShowSnackbar) {
            Snackbar.make(this.getWindow().getDecorView().findViewById(android.R.id.content), "Please check your Internet Connection", Snackbar.LENGTH_SHORT).show();
            shoudShowSnackbar = !shoudShowSnackbar;
        }
        doThisThingIfFoundInternet();
    }
}