java Android：二维ArrayList帮助
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Android: Two dimensional ArrayList Help
提问by Biggsy
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.
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 并且遇到了一些麻烦。
Here is my code:
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);
}
}
回答by Corey Sunwold
Well you need to first create a two dimensional ArrayList. To do that, you need to create an ArrayList of ArrayLists.
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。
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):
那么你的循环将成为这些方面的东西（假设我明白你想要做什么）：
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);
}
