Strange behaviour when using WebView and RelativeLayout in fullscreen

Question

EDIT: Here's the video showing the problem: www.youtube.com/watch?v=5ZZsuMH5T9k I'm really stuck here :/

--

I have an activity which consists of a webview and a button at the bottom. I set the window of the activity to fullscreen using this code in onCreate:

@Override
public void onCreate(Bundle savedInstanceState) {
  InstaFetchApplication.applyCurrentTheme(this);

  super.onCreate(savedInstanceState);

  getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  requestWindowFeature(Window.FEATURE_PROGRESS);

  if (UserPreferences.getIsFullScreenReadingEnabled(this)) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);

    // this just do this: window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    ActivityUtils.toggleFullScreen(this, true);
  }

  setContentView(R.layout.view_article);

  // ...
}

The problem is that most of the time the webview seems to "push" the button off the screen. Here's the screenshot:

(larger version)

What I would expect to see (and sometimes I do) is here:

(larger version)

Here's the layout I'm using (note that in my app the top layout has to be a RelativeLayout):

<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/layout_test"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
>
  <Button
    android:id="@+id/button"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:text="Click me!"
  />
  <WebView
    android:id="@+id/web_view"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_above="@id/button"
  />
</RelativeLayout>

I also noticed that if you turn off all animations on the device using system settings, the issue is gone (though there's this glitch when the whole view has a top margin and then it jumps back in the correct position).

Did anyone encounter similar problem and know how to fix it?

Answer 1

Finally I found the answer. Adding WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS flag to the window solved my problem.

See this post: flag_fullscreen + windowNoTitle == button focus bug.

Answer 2

I just added a button to the Hello WebView tutorial, and everything seems to look right. Then I converted main.xml from LinearLayout to RelativeLayout, and everything still seems to look right. I think you are making things too complicated. :-) Try removing most of that initialization code from onCreate() and just specify it in the XML.

Here is my project.

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.hellowebview"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="4" android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".HelloWebViewActivity"
            android:label="@string/app_name" 
            android:theme="@android:style/Theme.NoTitleBar"
            >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

HelloWebViewActivity.java:

package com.example.android.hellowebview;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class HelloWebViewActivity extends Activity {

    WebView mWebView;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_rl);

        mWebView = (WebView) findViewById(R.id.webview);
        mWebView.setWebViewClient(new HelloWebViewClient());
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.loadUrl("http://www.google.com");
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
            mWebView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

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

main_ll.xml (LinearLayout):

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <WebView
        android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
    />
    <Button
        android:id="@+id/mainbtn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:text="@string/btn_label"
    />
</LinearLayout>

main_rl.xml (RelativeLayout):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <WebView
        android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@+id/mainbtn"
    />
    <Button
        android:id="@+id/mainbtn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="@string/btn_label"
    />
</RelativeLayout>

strings.xml:

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

    <string name="hello">Hello World, HelloWebViewActivity!</string>
    <string name="app_name">HelloWebView</string>
    <string name="btn_label">Push Me</string>

</resources>