Android 跳转界面 自动弹出输入框

/*入口*/

handler.postDelayed(runnable, 500);

.....

private Handler handler = new Handler(Looper.getMainLooper());
private Runnable runnable = new Runnable() {
    @Override
    public void run() {
        /*获取焦点*/
        editText.setFocusable(true);
        editText.setFocusableInTouchMode(true);
        editText.requestFocus();
        collegeNum.setVisibility(View.GONE);
        resultSchoolListView.setVisibility(View.GONE);
        /*打开软键盘*/
        imm.showSoftInput(editText, InputMethodManager.SHOW_FORCED);
    }
};