本文介绍了ArrayList适配器构造函数失败(?)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
需要知道如何创建由Textview填充的ArrayList
Need to know how to create an ArrayList
filled by a Textview
我正在尝试为多维(2D)ArrayList
创建一个ArrayAdapter
:
I am trying to create an ArrayAdapter
for a Multidimensional (2D) ArrayList
:
final ArrayAdapter<ArrayAdapter<ArrayList<String>>> adapterNames = new ArrayAdapter<ArrayAdapter<ArrayList<String>>>(this,android.R.layout.simple_list_item_1, android.R.id.text1, arrayNamesOne);
这是我收到的日志错误:
This is the log error I get:
如果您希望对感兴趣的整个代码有更好的了解,请执行以下操作:
If you prefer to take a better look at the whole code interested, here you go:
public class MainActivity extends ActionBarActivity {
//1ST DECLARATION
ArrayList<ArrayList<String>> arrayNamesOne = new ArrayList<ArrayList<String>>();
ListView listNamesOne;
TextView namesTextOne;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//1ST SETUP
listNamesOne = (ListView) findViewById(R.id.listNamesId);
namesTextOne = (TextView) findViewById(R.id.namesTexter);
final ArrayAdapter<ArrayAdapter<ArrayList<String>>> adapterNames = new ArrayAdapter<ArrayAdapter<ArrayList<String>>>(this,android.R.layout.simple_list_item_1, android.R.id.text1, arrayNamesOne);
listNamesOne.setAdapter(adapterNames);
//END 1ST SETUP
//1ST BUTTON '+'
Button buttonPlus = (Button)findViewById(R.id.buttonPlus);
buttonPlus.setOnClickListener(
new Button.OnClickListener() {
//CLICK EVENT
@Override
public void onClick(View v) {
//IF EMPTY
if (namesTextOne.getText().toString().isEmpty()){
Context context = getApplicationContext();
CharSequence text = "Add an item first";
int duration = Toast.LENGTH_SHORT;
Toast.makeText(context, text, duration).show();
//IF SPACES ONLY
}else if(namesTextOne.getText().toString().trim().isEmpty()){
Context context = getApplicationContext();
CharSequence text = "You can't use spaces only";
int duration = Toast.LENGTH_SHORT;
namesTextOne.setText("");
Toast.makeText(context, text, duration).show();
//ALRIGHT, ADD IT!
} else if(!namesTextOne.getText().toString().isEmpty()) {
arrayNamesOne.add(0, (ArrayList<String>) namesTextOne.getText());
adapterNames.notifyDataSetChanged();
namesTextOne.setText("");
}
}
}
);
}
推荐答案
如果您要为字符串列表创建适配器,则需要这样:
If you were creating an adapter for a list of strings it would like this:
ArrayList<String> array = new ArrayList<String>();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, android.R.id.text1, array);
因此,用于字符串列表的适配器看起来像:
So an adapter for a list of lists of strings would look like:
ArrayList<ArrayList<String>> array = new ArrayList<ArrayList<String>>();
ArrayAdapter<ArrayList<String>> adapter = new ArrayAdapter<ArrayList<String>>(this,android.R.layout.simple_list_item_1, android.R.id.text1, array);
这篇关于ArrayList适配器构造函数失败(?)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!