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@Override public void onAttachedToWindow() {
      System.out.println("Page01 -->onAttachedToWindow");     this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);     super.onAttachedToWindow(); } BACK键：

@Override     public void onBackPressed() {
  //        super.onBackPressed();     } 多任务键：

getWindow().addFlags(5);