如何从cursor中获取一个字符串然后放入 putExtra 。为ListView调用一个onItemClick。我需要从数据库名是'gotoURL' 的数据库中获取字符串，再放进 activity 里的 onItemClick 方法中：
i.putExtra("Url", ???).
Activity：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.list_view2);
final ListView lv = getListView();
activityTitle = (TextView) findViewById(R.id.titleBarTitle);
activityTitle.setText("ADVISORY CIRCULATORS");
displayResultList();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
// @Override
public void onItemClick(AdapterView<?> a, View v, int position,long id)
{
Toast.makeText(List_AC.this, "Clicked!", Toast.LENGTH_LONG).show();
Object o = lv.getItemAtPosition(position);
Adapter_AC fullObject = (Adapter_AC)o;
Intent i = new Intent(List_AC.this, DocView.class);
//i.putExtra("url", Adapter_AC.gotoURL);
startActivity(i);
}
});
}
private void displayResultList() {
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED)) {
extStorageDirectory = Environment.getExternalStorageDirectory()
.toString();
File dbfile = new File(extStorageDirectory
+ "/XXX/XXX/dB/XXX.db");
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile,
null);
Cursor databaseCursor = db.rawQuery(
"SELECT * FROM AC_list ORDER BY `label` ASC", null);
Adapter_AC databaseListAdapter = new Adapter_AC(this,
R.layout.list_item, databaseCursor, new String[] { "label",
"title", "description" }, new int[] { R.id.label,
R.id.listTitle, R.id.caption });
databaseListAdapter.notifyDataSetChanged();
this.setListAdapter(databaseListAdapter);
} else if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_UNMOUNTED)) {
Log.i("tag", "SDCard is NOT writable/mounted");
Alerts.sdCardMissing(this);
}
}
}
Adapter:
public class Adapter_AC extends SimpleCursorAdapter {
private Cursor dataCursor;
private LayoutInflater mInflater;
public Adapter_AC(Context context, int layout, Cursor dataCursor,
String[] from, int[] to) {
super(context, layout, dataCursor, from, to);
this.dataCursor = dataCursor;
mInflater = LayoutInflater.from(context);
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
holder.text1 = (TextView) convertView.findViewById(R.id.label);
holder.text2 = (TextView) convertView.findViewById(R.id.listTitle);
holder.text3 = (TextView) convertView.findViewById(R.id.caption);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
dataCursor.moveToPosition(position);
int label_index = dataCursor.getColumnIndex("label");
String label = dataCursor.getString(label_index);
int title_index = dataCursor.getColumnIndex("title");
String title = dataCursor.getString(title_index);
int description_index = dataCursor.getColumnIndex("description");
String description = dataCursor.getString(description_index);
int goto_index = dataCursor.getColumnIndex("gotoURL");
String gotoURL = dataCursor.getString(goto_index);
holder.text1.setText(label);
holder.text2.setText(title);
holder.text3.setText(description);
return convertView;
}
static class ViewHolder {
TextView text1;
TextView text2;
TextView text3;
}
}
一般不这么写，一般不会直接传Cursor dataCursor这个到适配器里面。你直接在外面把数据查询出来然后放到一个容器里面，然后把容器传进去。
首先在Activity：里面定义全局的适配器和数据容器。
然后再onCreate事件里面加载数据，和通过适配器将数据绑定到listview里面。
public class AppContactActivity extends Activity {
ListView listView;
ContactAdapter cadp;
static ArrayList<ContactEtity> listDatas;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.myappcontact);
listView = (ListView) this.findViewById(R.id.lvAppContacts);
listView.setDivider(null);
try {
listDatas = MyApplication.ContactEtityAll;
} catch (Exception e) {
System.out.print(e.getMessage());
}
try {
if (listDatas != null) {
if (listDatas.size() <= 0) {
} else {
cadp = new ContactAdapter(getApplicationContext(),
listDatas);
// 适配器与ListView绑定
listView.setAdapter(cadp);
listView.setOnItemClickListener(new ItemClickListener());
}
}
} catch (Exception e) {
System.out.print(e.getMessage());
}
}
private class ItemClickListener implements OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
//根据下标在适配器中获取你选中的对象数据。
ContactEtity idContent = (ContactEtity) cadp.getItem(position);
Intent intent = new Intent();
Bundle bunle = new Bundle();
bunle.putStringArray("NamePhone", new String[] { idContent.name,
idContent.phone });
intent.putExtras(bunle);
setResult(RESULT_OK, intent);
finish();
}
}
}
enter code here如果我没猜做的话，你是想获取dataCursor里"gotoURL"这一列的值，但是现在int goto_index = dataCursor.getColumnIndex("gotoURL");是一个局部变量，外面访问不到吧，而且这个强制转换合适吗？
Object o = lv.getItemAtPosition(position);
Adapter_AC fullObject = (Adapter_AC)o;
也许你可以在你的ViewHolder 多写一个Textview,当然这个textview的可见属性是“gone”这个Textview用来保存int goto_index = dataCursor.getColumnIndex("gotoURL");，这样在onItemClick里得到每一行的view或cursor都是可以的，再通过Id或cursor获取你想要值应该可行。 也许你的思路凌乱了。
可以使用setTag的方式在listview的itemview中把想要传递的值存储起来，在onItemClick的时候从itemview中取tag，就可以了