安卓：二维的ArrayList帮助 [英] Android: Two dimensional ArrayList Help

问题描述

目前我有我的code将用户输入连接到一维的ArrayList，但我想将它们放到一个二维的ArrayList和时遇到一些麻烦。

下面是我的code：

 公共类游戏扩展活动实现OnClickListener {
   私有静态最后弦乐TAG =黑客帝国;
   静态的ArrayList＆LT;＆的EditText GT; columnEditTexts;
   @覆盖
   公共无效的onCreate（捆绑savedInstanceState）{
       super.onCreate（savedInstanceState）;
       this.setContentView（R.layout.matrix）;
       查看doneButton = findViewById（R.id.done_button）;
       doneButton.setOnClickListener（本）;
       columnEditTexts =新的ArrayList＆LT;＆的EditText GT;（）;       的for（int i = 0; I＆LT; MatrixMultiply.h1;我++）{
           TableLayout表=（TableLayout）findViewById（R.id.myTableLayout）;
           连续的TableRow =新的TableRow（本）;
           列的EditText =新的EditText（本）;
           对于（INT J = 0; J＆LT; MatrixMultiply.w1; J ++）{
               表=（TableLayout）findViewById（R.id.myTableLayout）;
               列=新的EditText（本）;
               column.setId（ⅰ）;
               row.addView（列）;
               columnEditTexts.add（列）;
           }
           table.addView（行）;
       }   }
 

解决方案

那么你需要首先创建一个二维的ArrayList。要做到这一点，你需要创建的ArrayLists的ArrayList

 的ArrayList＆LT; ArrayList的＆LT;＆的EditText GT;＆GT; arrayOfEditTexts =新的ArrayList＆LT; ArrayList的＆LT;＆的EditText GT;＆GT;（）;
 

这样，那么你循环将成为东西沿着这些路线（假设我明白你正在尝试做的）：

 的for（int i = 0; I＆LT; MatrixMultiply.h1;我++）{
       columnEditTexts =新的ArrayList＆LT;＆的EditText GT;（）;
       TableLayout表=（TableLayout）findViewById（R.id.myTableLayout）;
       连续的TableRow =新的TableRow（本）;
       列的EditText =新的EditText（本）;
       对于（INT J = 0; J＆LT; MatrixMultiply.w1; J ++）{
           列=新的EditText（本）;
           column.setId（ⅰ）;
           row.addView（列）;
           columnEditTexts.add（列）;
       }
       table.addView（行）;
       arrayOfEditTexts.add（columnEditTexts）;
   }
 

Currently I have my code putting user input into a one-dimensional ArrayList, but I would like to put them into a two dimensional ArrayList and am having some trouble.

Here is my code:

public class Game extends Activity implements OnClickListener {
   private static final String TAG = "Matrix";
   static ArrayList<EditText> columnEditTexts;




   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       this.setContentView(R.layout.matrix);
       View doneButton = findViewById(R.id.done_button);
       doneButton.setOnClickListener(this);
       columnEditTexts = new ArrayList<EditText>();

       for(int i = 0; i < MatrixMultiply.h1; i++){
           TableLayout table = (TableLayout)findViewById(R.id.myTableLayout);
           TableRow row = new TableRow(this);
           EditText column = new EditText(this);
           for(int j = 0; j < MatrixMultiply.w1; j++){
               table = (TableLayout)findViewById(R.id.myTableLayout);
               column = new EditText(this);
               column.setId(i);
               row.addView(column);
               columnEditTexts.add(column);
           }
           table.addView(row);
       }



   }

解决方案

Well you need to first create a two dimensional ArrayList. To do that, you need to create an ArrayList of ArrayLists.

ArrayList<ArrayList<EditText>> arrayOfEditTexts = new ArrayList<ArrayList<EditText>>();

So then you loop will become something along these lines (assuming I understand what you are trying to do):

for(int i = 0; i < MatrixMultiply.h1; i++){
       columnEditTexts = new ArrayList<EditText>();
       TableLayout table = (TableLayout)findViewById(R.id.myTableLayout);
       TableRow row = new TableRow(this);
       EditText column = new EditText(this);
       for(int j = 0; j < MatrixMultiply.w1; j++) {               
           column = new EditText(this);
           column.setId(i);
           row.addView(column);
           columnEditTexts.add(column);
       }
       table.addView(row);
       arrayOfEditTexts.add(columnEditTexts);
   }

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