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

问题描述

目前我的代码将用户输入放入一维 ArrayList，但我想将它们放入二维 ArrayList 并且遇到了一些问题.

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.

这是我的代码:

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);
       }



   }

推荐答案

那么你需要先创建一个二维的 ArrayList.为此，您需要创建一个 ArrayList 的 ArrayList.

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>>();

那么你的循环就会变成这样(假设我明白你在做什么):

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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