在啟動頁的時候華為手機虛擬按鍵遮擋住了啟動頁下面的字找了找解決辦法，特地記錄一下

第一種辦法：擴充套件虛擬按鍵

 /**
     * 隱藏虛擬按鍵，並且全屏
     */
    protected void hideBottomUIMenu() {
        //隱藏虛擬按鍵，並且全屏
        if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
            View v = this.getWindow().getDecorView();
            v.setSystemUiVisibility(View.GONE);
        } else if (Build.VERSION.SDK_INT >= 19) {
            //for new api versions.
            View decorView = getWindow().getDecorView();
            int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN;
            decorView.setSystemUiVisibility(uiOptions);
        }
    }