设置透明的状态栏

调用下面这个方法就可以让状态栏透明，那么布局都会延伸到状态栏 

public void setTraspartenStatusBar() {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

            Window window = getWindow();

            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS

                    | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

            window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);

            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);

            window.setStatusBarColor(Color.TRANSPARENT);

            window.setNavigationBarColor(Color.TRANSPARENT);

        }

    }