CompatCollapsingToolbarLayout

CompatCollapsingToolbarLayout.java

public class CompatCollapsingToolbarLayout extends CollapsingToolbarLayout {
    private boolean mLayoutReady;

    public CompatCollapsingToolbarLayout(Context context) {
        this(context, null);
    }

    public CompatCollapsingToolbarLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CompatCollapsingToolbarLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        if (!mLayoutReady) {
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {
                if ((getWindowSystemUiVisibility() &
                        (SYSTEM_UI_FLAG_LAYOUT_STABLE|SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)) ==
                        (SYSTEM_UI_FLAG_LAYOUT_STABLE|SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)) {
                    try {
                        Field mLastInsets = CollapsingToolbarLayout.class.getDeclaredField("mLastInsets");
                        mLastInsets.setAccessible(true);
                        mLastInsets.set(this, null);
                    } catch (NoSuchFieldException e) {
                        e.printStackTrace();
                    } catch (IllegalAccessException e) {
                        e.printStackTrace();
                    }
                }
            }

            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
                mLayoutReady = true;
            }
        }

        super.onLayout(changed, left, top, right, bottom);
    }

    public void refix() {
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {
            if ((getWindowSystemUiVisibility() &
                    (SYSTEM_UI_FLAG_LAYOUT_STABLE|SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)) ==
                    (SYSTEM_UI_FLAG_LAYOUT_STABLE|SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)) {
                try {
                    Field mLastInsets = CollapsingToolbarLayout.class.getDeclaredField("mLastInsets");
                    mLastInsets.setAccessible(true);
                    mLastInsets.set(this, null);
                } catch (NoSuchFieldException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        }

        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
            mLayoutReady = true;
        }
    }
}