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@Override

         /**

          * 后退键

          */

         publicvoid onBackPressed() {

                  

                   Intentintent  = new Intent();

                   intent.setAction("android.intent.action.MAIN");

                   intent.addCategory("android.intent.category.HOME");

                   intent.addCategory("android.intent.category.DEFAULT");

                   intent.addCategory("android.intent.category.MONKEY");

                   startActivity(intent);

         }