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Android 手动调用 返回键

可用的方法是：onBackPressed();
2. 如果想要按下返回键时附加执行一些代码，可以写在这里
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@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
   if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
       // Do something.
       return true;
   }
   return super.onKeyDown(keyCode, event);
}
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