如何创建动态多维ArrayList？

Question

我正在创建一个Android应用程序，为了使其工作，我需要动态创建一个多维ArrayList(2D):

我把代码留给您，以便让您理解它是如何被排序的，这样您就可以清除它来添加这个特性（可能我不仅想要代码本身的装饰，还想要对其中的内容有一个几乎详细的解释，我会非常感谢的！

public class MainActivity extends ActionBarActivity {

ArrayList<String> arrayNames = new ArrayList<String>();
ListView listNames;
TextView namesText;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    //Creating and Printing Lists
    listNames = (ListView) findViewById(R.id.listNamesId);
    namesText = (TextView) findViewById(R.id.namesTexter);
    final ArrayAdapter<String> adapterNames = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, android.R.id.text1, arrayNames);
    listNames.setAdapter(adapterNames);


    Button buttonPlus = (Button)findViewById(R.id.buttonPlus);
    buttonPlus.setOnClickListener(
            new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (namesText.getText().toString().isEmpty()){
                        Context context = getApplicationContext();
                        CharSequence text = "You cannot add an empty Item!";
                        int duration = Toast.LENGTH_SHORT;
                        Toast.makeText(context, text, duration).show();

                    }else if(namesText.getText().toString().trim().isEmpty()){
                        Context context = getApplicationContext();
                        CharSequence text = "You cannot add an Item with spaces only!";
                        int duration = Toast.LENGTH_SHORT;
                        namesText.setText("");
                        Toast.makeText(context, text, duration).show();

                    } else if(namesText.getText().toString() != null && !namesText.getText().toString().isEmpty()) {
                        arrayNames.add(0, namesText.getText().toString());
                        adapterNames.notifyDataSetChanged();
                        namesText.setText("");
                    }

                }
            }
    );
}

http://imgur.com/a/ajyoe

Answer 1

可以使用ArrayList的ArrayList。

ArrayList<ArrayList<String>> multiDimensionalArrayList = new ArrayList<ArrayList<String>>();

multiDimensionalArrayList.add(new ArrayList<>());
multiDimensionalArrayList.get(0).add("...");