動(dòng)態(tài)向listView Android添加元素有人能解釋或建議一個(gè)教程來在Android中創(chuàng)建listView嗎？以下是我的要求：我應(yīng)該能夠通過按一個(gè)按鈕來動(dòng)態(tài)地添加新元素。應(yīng)該足夠簡(jiǎn)單地理解(例如，可能沒有任何性能改進(jìn)或轉(zhuǎn)換視圖)我知道這里有很多關(guān)于這個(gè)話題的問題，張貼在StackOverflow上，但是找不到任何能回答我問題的問題。謝謝!
3 回答
慕的地6264312
TA貢獻(xiàn)1817條經(jīng)驗(yàn) 獲得超6個(gè)贊
listItems.add("New Item");adapter.notifyDataSetChanged();adapter.add("New Item");
BIG陽
TA貢獻(xiàn)1859條經(jīng)驗(yàn) 獲得超6個(gè)贊
private EditText editTxt;private Button btn;private ListView list;private ArrayAdapter<String> adapter;private ArrayList<String>
arrayList;@Overrideprotected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editTxt = (EditText) findViewById(R.id.editText);
btn = (Button) findViewById(R.id.button);
list = (ListView) findViewById(R.id.listView);
arrayList = new ArrayList<String>();
// Adapter: You need three parameters 'the context, id of the layout (it will be where the data is shown),
// and the array that contains the data
adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item, arrayList);
// Here, you set the data in your ListView
list.setAdapter(adapter);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// this line adds the data of your EditText and puts in your array
arrayList.add(editTxt.getText().toString());
// next thing you have to do is check if your adapter has changed
adapter.notifyDataSetChanged();
}
});}- 3 回答
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