RickON RickON - 3 years ago 246
Android Question

White blank screen using webview

I am trying to start an activity with webview layout, without opening up a new webbrowser. So it would be embeded in the app.

Seems like it worked for a few days and now... I'm only getting a white blank screen. Could you please give me a hand here?

Here's my xml layout:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true">
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/webView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>


<Button
android:id="@+id/backBtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:height="50dip"
android:background="#4d867f"
android:text="Back"
android:textColor="#f9f9f9"
android:textSize="20dip" />

</LinearLayout>
</RelativeLayout>


Here's how I am calling the activity:

promotionBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {

Intent intent = new Intent(MainActivity.this, PromotionActivity.class);
intent.putExtra("url", "https://www.test.com/apppromotion.html");
startActivity(intent);
}
});


And finally the activity:

package br.com.test.androidtools;

import android.content.Intent;
import android.net.Uri;
import android.app.Activity;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.Toast;
import android.webkit.WebViewClient;




public class PromotionActivity extends Activity {

private WebView webView;
private Button backBtn;

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if ((keyCode == KeyEvent.KEYCODE_BACK))
{
Intent it = new Intent(PromotionActivity.this, MainActivity.class);
startActivity((Intent)it);

return true;

}

return super.onKeyDown(keyCode, event);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.promotion_layout);

backBtn = (Button) findViewById(R.id.backBtn);

webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);

Bundle bundle = getIntent().getExtras();
webView.loadUrl(bundle.getString("url"));

webView.setWebViewClient(new myWebViewClient());

backBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent it = new Intent(PromotionActivity.this, MainActivity.class);
startActivity((Intent)it);
}
});



}




public class myWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}

}


Any ideas of what could fix this?
Thanks!

Answer Source

The url target had its SSL "Lets Encrypt" incorrectly configured. So simple, but it took me a while to find out! So before looking for a hard to crack solution, just point webviewer to another url.

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