在MainActivity.java文件中尝试以下代码:

try this code in MainActivity.java file:

  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
    if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) 
    {
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, 
        WindowManager.LayoutParams.FLAG_SECURE);
    };

 }