我正在使用基於BasedAdapter的自定義ListAdapter定製ListView。我的ListView產品有ToggleButton和EditText。在使用此ListView的活動中，我有一個名爲Save的Button。當我點擊Save時，該活動必須找到一些方法來從ListView獲取數據，以便使用此功能做一些事情。如何從自定義ListView中獲取數據以在Activity中使用？
在自定義ListView適配器，我使用ArrayList跟蹤變化DataItem，與代表了ListView項目（包含了ToggleButton一個boolean變量和EditText文本一String）模型。 問題是，當我點擊Save時，我必須以某種方式從適配器中獲取ArrayList的數據，該數據庫也包含每個列表項中的更新數據EditText和ToggleButton？
我該怎麼做？
通常情況下，您將是將此適配器設置到ListView中的人。您只需將此適配器的實例保存到Activity中的成員變量中即可。適配器已經提供了訪問單個項目的方法。您可以添加更多方法來獲取數據。事情是這樣的：
public class MyAdapter extends BaseAdapter {
List data;
......
public boolean[] getCheckStates() {
//get values of your checkboxes here
}
public String[] getTexts() {
//get text of your text boxes here
}
// implement all other methods of BaseAdapter
}
然後在你的活動：
這裏public class MyActivity extends Activity {
MyAdapter adapter;
public onCreate(Bundle instance) {
.....
adapter = new MyAdapter(...);
...
myList.setAdapter(adapter);
...
btnSave.setOnClickListener(new OnClickListener() {
public void onClick (View v) {
boolean[] checks = adapter.getCheckStates();
String[] texts = adapter.getTexts();
....
}
});
}
........
}
喜是什麼ü需要：
public class MusicTrack extends Activity {
private ArrayAdapter<CardDetails> listAdapter ;
ArrayList<Boolean> itemChecked = new ArrayList<Boolean>();
CardDetailsAdapter mListAdapter;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final ArrayList<CardDetails> cardResults = GetCardDetails();
for (int i = 0; i < cardResults.size(); i++) {
System.out.println("card redsults: " + cardResults.get(i).isSelected());
}
final ListView welcomelist = (ListView) findViewById(R.id.welcomelistID);
listAdapter = new CardDetailsAdapter(this, cardResults);
welcomelist.setAdapter(listAdapter);
final Button saveBtn = (Button) findViewById(R.id.saveID);
saveBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// get the checkbox status and save related details into database
// Intent intent = new Intent(MusicTrack.this, TransactionSummaryActivity.class);
itemChecked = mListAdapter.itemChecked1;
System.out.println("item checked: " + itemChecked);
for (int i = 0; i < cardResults.size(); i++) {
System.out.println("cardResults and checked status: " + cardResults.get(i).getText());
System.out.println("cardResults and checked status111: " + cardResults.get(i).isSelected());
}
}
});
}
private ArrayList<CardDetails> GetCardDetails() {
ArrayList<CardDetails> carddetailresults = new ArrayList<CardDetails>();
CardDetails sr1 = new CardDetails();
sr1.setText("Text1");
sr1.setSelected(false);
carddetailresults.add(sr1);
sr1 = new CardDetails();
sr1.setText("Text2");
sr1.setSelected(true);
carddetailresults.add(sr1);
sr1 = new CardDetails();
sr1.setText("Text3");
sr1.setSelected(true);
carddetailresults.add(sr1);
sr1 = new CardDetails();
sr1.setText("Text4");
sr1.setSelected(true);
carddetailresults.add(sr1);
sr1 = new CardDetails();
sr1.setText("Text5");
sr1.setSelected(false);
carddetailresults.add(sr1);
return carddetailresults;
}}
class CardDetails{
String text;
Boolean selected;
public String getText() {
return text;
}
public void setText(String bankName) {
text = bankName;
}
public boolean isSelected() {
return selected;
}
public void setSelected(boolean selected) {
this.selected = selected;
}}
class CardDetailsAdapter extends ArrayAdapter<CardDetails> {
private static ArrayList<CardDetails> searchArrayList;
public static ArrayList<Integer> alSelCards = new ArrayList<Integer>();
public static ArrayList<Boolean> itemChecked1 = null;
private LayoutInflater mInflater;
protected Context getContext;
public CardDetailsAdapter(Context context, ArrayList<CardDetails> results) {
super(context, R.layout.webview, R.id.textID, results);
// Cache the LayoutInflate to avoid asking for a new one each time.
searchArrayList = results;
getContext = context;
mInflater = LayoutInflater.from(context) ;
itemChecked1 = new ArrayList<Boolean>();
for (int i = 0; i < results.size(); i++) {
itemChecked1.add(i, results.get(i).isSelected()); // initializes all items value with
}
}
public int getCount() {
if (searchArrayList != null)
return searchArrayList.size();
return 0;
}
public CardDetails getItem(int position) {
return searchArrayList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
final ViewGroup parent) {
CardDetails planet = (CardDetails) this.getItem(position);
final ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.webview, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.textID);
holder.chkbox = (ToggleButton) convertView.findViewById(R.id.togID);
convertView.setTag(holder);
holder.text.setText(searchArrayList.get(position).getText());
holder.chkbox.setTag(planet);
holder.chkbox.setChecked(planet.isSelected());
} else {
holder = (ViewHolder) convertView.getTag();
ViewHolder viewHolder = (ViewHolder) convertView.getTag();
holder.chkbox = viewHolder.getCheckBox();
holder.text = viewHolder.getText();
holder.text.setText(searchArrayList.get(position).getText());
holder.chkbox.setTag(planet);
holder.chkbox.setChecked(planet.isSelected());
}
holder.chkbox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
ToggleButton cb = (ToggleButton) v;
CardDetails planet = (CardDetails) cb.getTag();
//planet.setSelected(cb.isChecked());
if (holder.chkbox.isChecked()) {
itemChecked1.set(position, true);
holder.chkbox.setChecked(true);
planet.setSelected(true);
} else if (!holder.chkbox.isChecked()) {
itemChecked1.set(position, false);
holder.chkbox.setChecked(false);
planet.setSelected(false);
}
}
});
return convertView;
}
public static class ViewHolder {
private ToggleButton chkbox;
TextView text;
public ViewHolder() {
}
public ViewHolder(TextView text, ToggleButton chkbox) {
this.chkbox = chkbox;
this.text = text;
}
public ToggleButton getCheckBox() {
return chkbox;
}
public void setCheckBox(CheckBox checkBox) {
this.chkbox = chkbox;
}
public TextView getText() {
return text;
}
public void setText(TextView text) {
this.text = text;
}
}}
進口所需要的東西
首先，我想感謝您的支持，這對您很好。在您的適配器中，您可以預先設置EditText的文本值。沒問題，我第一次加載。但我的問題，當用戶更改EditText中的文本（在每個ListView項目中）。我必須將這個新輸入的文本更新回適配器中存儲信息的ArrayList（對應於ListView中的項目位置）。我嘗試EditText的「onFocusChanged」事件。但是還有更多問題出現。 （也許我會在另一個帖子中問他們）。 – toantran 2012-04-27 02:37:28
是的，那是正確的。 另外，要獲得radioButton checkedId你需要創建一個onCkeckedChangeListener並在那裏設置checkedId。之後，覆蓋以下方法
public int[] getChkId() {
return chkId;
}
以獲取選中的單選按鈕。 謝謝。
感謝Aleks G. – toantran 2012-04-27 02:39:26