安卓全屏的设置-代码设置

@Override
    public void onWindowFocusChanged(boolean hasFocus)
    {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus && Build.VERSION.SDK_INT >= 19)
        {
            View decorView = getWindow().getDecorView();
            decorView.setSystemUiVisibility((
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                            | View.SYSTEM_UI_FLAG_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
            ));
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
        {
            Window win = getWindow();
            WindowManager.LayoutParams winParams = win.getAttributes();
            final int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
            winParams.flags |= bits;
            win.setAttributes(winParams);
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
        {
            Window window = getWindow();
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
        }
    }           

当页面的焦点发生变化的时候，就调用此函数，设置页面窗口为全屏；防止从别的页面回来后导航栏又弹出来，典型的如dialog.

PS：在8.0的时候，状态栏可能会出可能会出问题，配合以下代码使用：

<!--设置application的theme;隐藏状态栏，并设置全屏-->
<item name="windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>           

此theme可设置给activity，也可以设置给dialog。