35157

Restore webview scroll position?

Question:

I want to <strong>save the state</strong> of my webView with its <strong>page scroll position</strong> when user leaves the app and restore them when user opens the app again. So that, user can continue reading the restored webview content scrolled down to the restored position.

Here are methods I'm using:

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_book); webView = (WebView)this.findViewById(R.id.webView); if (savedInstanceState != null) { int positionY = Math.round(scrollPos); webView.scrollTo(0, positionY); } esle { //do something }

Function that calculates the position:

private int calculateProgression(WebView content) { int positionTopView = content.getTop(); int contentHeight = content.getContentHeight(); int currentScrollPosition = content.getScrollY(); int percentWebview = (currentScrollPosition - positionTopView) / contentHeight; return percentWebview; }

save/restore functions:

@Override protected void onSaveInstanceState(Bundle outState) { outState.putInt("position", calculateProgression(webView)); super.onSaveInstanceState(outState); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); scrollPos = savedInstanceState.getFloat("position"); }

Answer1:

You could save the position in the <a href="https://developer.android.com/reference/android/content/SharedPreferences.html" rel="nofollow">SharedPreferences</a> in the OnDestroy method and retrieve it in the OnCreate method.

<strong>EDIT</strong>: As stated <a href="https://developer.android.com/reference/android/app/Activity.html#onDestroy%28%29" rel="nofollow">here</a>, OnPause should be the place to store data, not OnDestroy.

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