Android Soft-Keyboard listener

android_soft_keyboard_listener.java

// Threshold for minimal keyboard height.
final int MIN_KEYBOARD_HEIGHT_PX = 150;

// Top-level window decor view.
final View decorView = activity.getWindow().getDecorView();

// Register global layout listener.
decorView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    private final Rect windowVisibleDisplayFrame = new Rect();
    private int lastVisibleDecorViewHeight;

    @Override
    public void onGlobalLayout() {
        // Retrieve visible rectangle inside window.
        decorView.getWindowVisibleDisplayFrame(windowVisibleDisplayFrame);
        final int visibleDecorViewHeight = windowVisibleDisplayFrame.height();

        // Decide whether keyboard is visible from changing decor view height.
        if (lastVisibleDecorViewHeight != 0) {
            if (lastVisibleDecorViewHeight > visibleDecorViewHeight + MIN_KEYBOARD_HEIGHT_PX) {
                // Calculate current keyboard height (this includes also navigation bar height when in fullscreen mode).
                int currentKeyboardHeight = decorView.getHeight() - windowVisibleDisplayFrame.bottom;
                // Notify listener about keyboard being shown.
                listener.onKeyboardShown(currentKeyboardHeight);
            } else if (lastVisibleDecorViewHeight + MIN_KEYBOARD_HEIGHT_PX < visibleDecorViewHeight) {
                // Notify listener about keyboard being hidden.
                listener.onKeyboardHidden();
            }
        }
        // Save current decor view height for the next call.
        lastVisibleDecorViewHeight = visibleDecorViewHeight;
    }
});