android 沉浸式效果

public void hideSystemUI(View view) {    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {        view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN                        | View.SYSTEM_UI_FLAG_FULLSCREEN                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY        );    }
}
//可以在activity中增加
@Overridepublic void onWindowFocusChanged(boolean hasFocus) {    super.onWindowFocusChanged(hasFocus);    if (hasFocus) {        //Immersive status bar
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
//透明导航栏
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        CommonUtil.hideSystemUI(getWindow().getDecorView());    }}
一般这个可以实现沉浸式效果，但是在弹出dialog或者popwindow等时，View的焦点会转移，导致沉浸式效果失败
所以我们在弹出dialog和popwindow时先不给它们焦点的show，然后再进行沉浸式效果，最后再把焦点给它们。
Dialog  exp：
mDialog = new Dialog(mContext);
//先不给焦点
mDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
mDialog.show();
hideSystemUI(mDialog.getWindow().getDecorView());
//show之后进行沉浸式再给焦点
mDialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

popwindow exp：
PopWindow pop = new PopWindow(mContext);pop.setFocusable(false);pop.update();pop.showAtLocation(v, Gravity.CENTER, 0, 0);
//这里注意给的是popwindow的View
hideSystemUI(pop.getContentView());pop.setFocusable(true);pop.update();