如何在具有两个编辑文本和一个微调器的Android应用程序中将所有字段设置为必填字段

Question

package com.example.dentalproject;

import android.app.Activity;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener 
{
/** Called when the activity is first created. */
EditText ettokenno,etcomments;
Button btnfeedback;
Spinner ratingspinner;
DatabaseAdapter dbAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    dbAdapter=new DatabaseAdapter(getApplicationContext());
    ettokenno=(EditText)findViewById(R.id.ed_tokennum);
    etcomments=(EditText)findViewById(R.id.ed_yourcomments);
    ratingspinner = (Spinner)findViewById(R.id.sp1_select);
    btnfeedback=(Button)findViewById(R.id.btnfeedback);

    btnfeedback.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId()==R.id.btnfeedback)
//if(ettokenno.equals("")&&(etcomments.equals("")))
{
//Toast.makeText(getApplicationContext(), "save",Toast.LENGTH_LONG).show();
String Tokenno=ettokenno.getText().toString();
String Comments=etcomments.getText().toString();

String Rating = ratingspinner.getSelectedItem().toString();
//String Rating = "Good";
if(Tokenno.equals(""))
{
Toast.makeText(getApplicationContext(), "please enter value",Toast.LENGTH_LONG).show();
}
if(Comments.equals(""))
{
Toast.makeText(getApplicationContext(), "please enter value",Toast.LENGTH_LONG).show();
}
dbAdapter.open();
long inserted=dbAdapter.insertTest(Tokenno,Comments, Rating);
if(inserted >0)
{
Toast.makeText(getApplicationContext(), "data saved",Toast.LENGTH_LONG).show();
ettokenno.setText("");
etcomments.setText("");
}
else
{
Toast.makeText(getApplicationContext(), "data not saved",Toast.LENGTH_LONG).show();
}
dbAdapter.close();
}

在这个应用程序中，我有两个编辑文本和一个微调器，

如何限制用户填写所有字段以及如何在用户离开编辑文本和微调器时生成对话框而没有填写数据，请帮助我朋友提前感谢}}

Answer 1

这是

针对两个TextView的

if (!text1.getText().toString().isEmpty() && !text2.getText().toString().isEmpty()){
     // Your Dialog or Toast for warning 
}
else{
     // your further code
}

对于Spinner，您可以设置setOnItemSelectedListener

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            spinner.setSelection(position);
        }
        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            spinner.setSelection(0);
        }
    });

Answer 2

使用布尔变量，比如flag

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId()==R.id.btnfeedback)
//if(ettokenno.equals("")&&(etcomments.equals("")))
{
//Toast.makeText(getApplicationContext(), "save",Toast.LENGTH_LONG).show();
String Tokenno=ettokenno.getText().toString();
String Comments=etcomments.getText().toString();

String Rating = ratingspinner.getSelectedItem().toString();
boolean flag = true;
if(Tokenno.equals(""))
{
Toast.makeText(getApplicationContext(), "please enter value",Toast.LENGTH_LONG).show();
flag = false;
}
if(Comments.equals(""))
{
Toast.makeText(getApplicationContext(), "please enter value",Toast.LENGTH_LONG).show();
flag = false;
}
if(flag) {
dbAdapter.open();
long inserted=dbAdapter.insertTest(Tokenno,Comments, Rating);
if(inserted >0)
{
Toast.makeText(getApplicationContext(), "data saved",Toast.LENGTH_LONG).show();
ettokenno.setText("");
etcomments.setText("");
}
else
{
Toast.makeText(getApplicationContext(), "data not saved",Toast.LENGTH_LONG).show();
}
}
dbAdapter.close();
}

Answer 3

尝试在onClick中遵循代码

@Override
    public void onClick(View v) {
    // TODO Auto-generated method stub
    if(v.getId()==R.id.btnfeedback)
    {
    String Tokenno=ettokenno.getText().toString().trim();
    if(TextUtils.isEmpty(Tokenno)){
        //show dialog for Tokenno
        return;
    }
    String Comments=etcomments.getText().toString();
    if(TextUtils.isEmpty(Comments)){
        //show dialog for Comments
        return;
    }
    String Rating = ratingspinner.getSelectedItem().toString();
    if(Rating.equals("YOUR_DEFAULT_VALUE")){
        //show dialog for rating
        return;
    }
  //all fields are filled 
}

这是显示不同类型的对话框的教程