Back button kicks me out of the app on WebView

问题

I'm developing a Javascript based web app and thought that I could use Android's WebView ability to make it like an actual app, so I jumped right into Android Studio and made a simple WebView app without any Java knowledge, but the problem is, between page transitions whenever I want to return back and hit the back button, the app closes itself. I found some solutions but I have no idea how to implement them correctly, so can you help me please? Here are my WebView's FullscreenActivity.java codes.

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);

    WebView view = (WebView) this.findViewById(R.id.webView);
    view.getSettings().setJavaScriptEnabled(true);
    view.setWebViewClient(new ZeroBrowser());
    view.loadUrl("http://www.google.com");
}

private class ZeroBrowserOverride extends WebViewClient implements ZeroBrowserOverride {

    @Override
    public boolean ShouldOverrideUrlLoading(WebView view, String Url){
        view.loadUrl(Url);
        return true;
    }
}

Thank you so much!

回答1:

You can try with this .

WebView view ; //Global    

  @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);

        view = (WebView) this.findViewById(R.id.webView);
                view.getSettings().setJavaScriptEnabled(true);
        view.setWebViewClient(new ZeroBrowser());
        view.loadUrl("http://www.google.com");
    }

Then

 @Override
public void onBackPressed() {
    if (view.canGoBack()) {
        view.goBack();
    } else {
        super.onBackPressed();
    }
}

How to go back to previous page if back button is pressed in WebView?

http://developer.android.com/intl/es/guide/webapps/webview.html

回答2:

You can check the clients history to go back within webview. Implement something like this:

@Override
public void onBackPressed() {
  if (mWebView.canGoBack()) {
      mWebView.goBack();
  } else {
      super.onBackPressed();
  }
}

回答3:

In your WebView class (or in parent view) override the listener:

@Override
public boolean onKeyDown(final int keyCode, final KeyEvent event) {
    // Check if the key event was the Back button and if there's history
    if ((keyCode == KeyEvent.KEYCODE_BACK) && this.canGoBack()) {
        this.goBack();
        return true;
    }
    // If it wasn't the Back key or there's no web page history, bubble up to the default
    // system behavior (probably exit the activity)
    return super.onKeyDown(keyCode, event);
}

来源：https://stackoverflow.com/questions/33546673/back-button-kicks-me-out-of-the-app-on-webview

标签

java

android

webview