使用WindowManager.LayoutParams.TYPE_KEYGUARD时,最小目标必须小于14

更新onAttachedToWindow,如下所示并尝试

@Override
public void onAttachedToWindow() { 
    if (!GlobalVars.testing) {
       GlobalVars.preventStatusBarExpansion(this);
    }
    super.onAttachedToWindow();
}

并使用添加更新oncreate

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,   WindowManager.LayoutParams.FLAG_FULLSCREEN);
    this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
    ...
 }

对于Api超过14使用

this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);