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//按后退键返回键回主菜单
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
startActivity(new Intent(getApplicationContext(),MainActivity.class));
return true;
}
return false;
}
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原文地址：http://www.cnblogs.com/jetereting/p/4695507.html
