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public class SoftInputAssist { | |
private View rootView; | |
private ViewGroup contentContainer; | |
private ViewTreeObserver viewTreeObserver; | |
private ViewTreeObserver.OnGlobalLayoutListener listener = () -> possiblyResizeChildOfContent(); | |
private Rect contentAreaOfWindowBounds = new Rect(); | |
private FrameLayout.LayoutParams rootViewLayout; | |
private int usableHeightPrevious = 0; | |
public SoftInputAssist(Activity activity) { | |
contentContainer = (ViewGroup) activity.findViewById(android.R.id.content); | |
rootView = contentContainer.getChildAt(0); | |
rootViewLayout = (FrameLayout.LayoutParams) rootView.getLayoutParams(); | |
} | |
public void onPause() { | |
if (viewTreeObserver.isAlive()) { | |
viewTreeObserver.removeOnGlobalLayoutListener(listener); | |
} | |
} | |
public void onResume() { | |
if (viewTreeObserver == null || !viewTreeObserver.isAlive()) { | |
viewTreeObserver = rootView.getViewTreeObserver(); | |
} | |
viewTreeObserver.addOnGlobalLayoutListener(listener); | |
} | |
public void onDestroy() { | |
rootView = null; | |
contentContainer = null; | |
viewTreeObserver = null; | |
} | |
private void possiblyResizeChildOfContent() { | |
contentContainer.getWindowVisibleDisplayFrame(contentAreaOfWindowBounds); | |
int usableHeightNow = contentAreaOfWindowBounds.height(); | |
if (usableHeightNow != usableHeightPrevious) { | |
rootViewLayout.height = usableHeightNow; | |
rootView.layout(contentAreaOfWindowBounds.left, contentAreaOfWindowBounds.top, contentAreaOfWindowBounds.right, contentAreaOfWindowBounds.bottom); | |
rootView.requestLayout(); | |
usableHeightPrevious = usableHeightNow; | |
} | |
} | |
} | |
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