Question

有没有办法在每次用户点击某个按钮时创建一个对象？

我制作了一个对象数组，作为创建对象的容器但程序崩溃!! 有工作方式吗？

package com.fawzyx.movie_rental_store;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.widget.TextView;
import java.lang.String;

public class MemReg_activity extends Activity{

    public member[] member ;


    String name; 
    String id ;
    String mail;
    String ccard ;
    String address ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.reg_layout);
        final EditText etname = (EditText)findViewById(R.id.etname);
        EditText etmail = (EditText)findViewById(R.id.etmail);
        EditText etid = (EditText)findViewById(R.id.etid);
        EditText etccard=(EditText)findViewById(R.id.etccard);
        EditText etaddress = (EditText)findViewById(R.id.etadress);


        name = etname.getText().toString();
        id = etid.getText().toString();
        mail = etmail.getText().toString();
        ccard = etccard.getText().toString();
        address = etaddress.getText().toString();

        Button btSubmit= (Button)findViewById(R.id.btsubmit);

        btSubmit.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
            if (etname.getText().toString().length()<5)
            {
            Toast.makeText(MemReg_activity.this, "Enter a valid name", Toast.LENGTH_LONG).show();   
            }   
            else 
            {
                int x=0;
                x++ ;
                member[x]  = new member(name, id, mail , ccard , address);

            }
            }
        });



    }

}

Answer 1

成员未在任何地方初始化。

//initialize
member = new member[15]; // 15 is just an example.

另一方面，如果尺寸不固定，您应该考虑使用List。

List<member> members = new ArrayList<member>();

并在onclick方法中，

members.add(new member());

要访问这些项目，

member m = members.get(0); // first item in the list

迭代所有项目，

   for(member m : members){
      // m is your member object
   }

在每次点击时创建一个对象

1 个答案: