手动触摸——软键盘自动退出
如果想点击哪个地方，然后让软键盘自动消失，就设置它
private EditText direct_times_cast, direct_chase_number;direct_times_cast = (EditText) findViewById(R.id.direct_times_cast);direct_chase_number = (EditText) findViewById(R.id.direct_chase_number);
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