Android EditText重新获取焦点弹出软键盘，选中内容

etPatientAllergy.setEnabled(true);
etPatientAllergy.setFocusable(true);
etPatientAllergy.setFocusableInTouchMode(true);
etPatientAllergy.requestFocus();
etPatientAllergy.requestFocusFromTouch();
etPatientAllergy.selectAll();
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(etPatientAllergy, InputMethodManager.RESULT_SHOWN);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);

final AlertDialog dialog= new AlertDialog.Builder(mContext).create();
editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
}
}
});