uniapp 安卓设置虚拟按钮（底部虚拟按钮）（底部导航栏）为透明、半透明、背景色

 var Color = plus.android.importClass("android.graphics.Color");  
 plus.android.importClass("android.view.Window");    
 var mainActivity = plus.android.runtimeMainActivity();    
 var window_android = mainActivity.getWindow();    
 var WindowManager=plus.android.importClass("android.view.WindowManager");    
 var View=plus.android.importClass("android.view.View");    
     //设置为全透明  
     window_android.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);  
     window_android.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN  | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);  
window_android.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);   
window_android.setNavigationBarColor(Color.TRANSPARENT);  
    //设置为全透明结束  

    //window_android.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);  //设置为半透明   

  // plus.android.invoke(window_android,"setNavigationBarColor",Color.parseColor("#000")); //为虚拟按钮添加背景色