如何通过一个字符串转换成onItemClick的ListView？ [英] How to pass a string into onItemClick ListView?
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问题描述
我如何得到我的光标串到我putExtra呼叫在onItemClick为一个ListView？我需要从我的名为gotoURL到DB列抢字符串：
i.putExtra（URL，???）。
...我在活动onItemClick的。示例code将是有助于学习。日Thnx！
我的活动有：
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
requestWindowFeature（Window.FEATURE_NO_TITLE）;
的setContentView（R.layout.list_view2）; 最终的ListView LV = getListView（）; activityTitle =（的TextView）findViewById（R.id.titleBarTitle）;
activityTitle.setText（顾问环行）; displayResultList（）; lv.setTextFilterEnabled（真）;
lv.setOnItemClickListener（新OnItemClickListener（）{
// @覆盖
公共无效onItemClick（适配器视图＆LT;＆gt;一种，视图V，INT位置，长的ID）
{
Toast.makeText（List_AC.this，点击了！，Toast.LENGTH_LONG）.show（）;
对象o = lv.getItemAtPosition（位置）;
Adapter_AC fullObject =（Adapter_AC）O;
意图I =新意图（List_AC.this，DocView.class）;
//i.putExtra(\"url，Adapter_AC.gotoURL）;
startActivity（ⅰ）;
}
}）;
}私人无效displayResultList（）{ 如果（android.os.Environment.getExternalStorageState（）。等于（
android.os.Environment.MEDIA_MOUNTED））{
extStorageDirectory = Environment.getExternalStorageDirectory（）
的ToString（）; 文件DBFILE =新的文件（extStorageDirectory
+/XXX/XXX/dB/XXX.db）; SQLiteDatabase DB = SQLiteDatabase.openOrCreateDatabase（DBFILE，
空值）; 光标databaseCursor = db.rawQuery（
SELECT * FROM AC_list ORDER BY`label` ASC，NULL）; Adapter_AC databaseListAdapter =新Adapter_AC（这一点，
R.layout.list_item，databaseCursor，新的String [] {标签
标题，说明}，新的INT [] {R.id.label，
R.id.listTitle，R.id.caption}）; databaseListAdapter.notifyDataSetChanged（）;
this.setListAdapter（databaseListAdapter）; }否则如果（android.os.Environment.getExternalStorageState（）。等于（
android.os.Environment.MEDIA_UNMOUNTED））{
Log.i（标签，SD卡不可写/安装）;
Alerts.sdCardMissing（本）;
}
}
}
和我的适配器：
公共类Adapter_AC扩展SimpleCursorAdapter {私人光标dataCursor;
私人LayoutInflater mInflater;公共Adapter_AC（上下文的背景下，INT布局，光标dataCursor，
的String []从，INT []到）{
超（背景下，布局，dataCursor，从，到）;
this.dataCursor = dataCursor;
mInflater = LayoutInflater.from（上下文）;
}公共查看getView（INT位置，查看convertView，父母的ViewGroup）{ ViewHolder持有人; 如果（convertView == NULL）{
convertView = mInflater.inflate（R.layout.list_item，NULL）; 持有人=新ViewHolder（）;
holder.text1 =（TextView中）convertView.findViewById（R.id.label）;
holder.text2 =（TextView中）convertView.findViewById（R.id.listTitle）;
holder.text3 =（TextView中）convertView.findViewById（R.id.caption）; convertView.setTag（保持器）;
}其他{
支架=（ViewHolder）convertView.getTag（）;
} dataCursor.moveToPosition（位置）; INT label_index = dataCursor.getColumnIndex（标签）;
字符串标签= dataCursor.getString（label_index）; INT title_index = dataCursor.getColumnIndex（标题）;
字符串title = dataCursor.getString（title_index）; INT description_index = dataCursor.getColumnIndex（说明）;
字符串描述= dataCursor.getString（description_index）; INT goto_index = dataCursor.getColumnIndex（gotoURL）;
字符串gotoURL = dataCursor.getString（goto_index）; holder.text1.setText（标签）;
holder.text2.setText（职称）;
holder.text3.setText（介绍）; 返回convertView;
}静态类ViewHolder {
TextView的文本1;
TextView的文本2;
TextView的文字3;
}
}
解决方案
您可以使用CursorAdapter的的getItem（）方法来获取指向当前ID的光标。像这样：
...
光标光标= adapter.getItem（ID）;
i.putExtra（URL，cursor.getString（cursor.getColumnIndex（gotoURL）））;
...
请注意，我怀疑你需要包括列在你的投影，像这样：
Adapter_AC databaseListAdapter =新Adapter_AC（这一点，
R.layout.list_item，databaseCursor，新的String [] {标签
标题，说明，gotoURL}，新的INT [] {R.id.label，
R.id.listTitle，R.id.caption，R.id.dummy}）;
和创建一个虚拟的（View.GONE）为不可见领域，使得数据在光标被拉
How do I get a string from my cursor into my putExtra call in an onItemClick for a ListView? I need to grab the string from my DB column named 'gotoURL' into the:
i.putExtra("Url", ???).
...of my onItemClick in the Activity. Sample code would be helpful for the learning. Thnx!!
My Activity has:
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);
}
}
}
And my 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;
}
}
解决方案
You can use the CursorAdapter's getItem() method to get a Cursor pointing to the current id. Like so:
...
Cursor cursor = adapter.getItem(id);
i.putExtra("url", cursor.getString(cursor.getColumnIndex("gotoURL")));
...
Note that I suspect you'll need to include that column in your projection, like so:
Adapter_AC databaseListAdapter = new Adapter_AC(this,
R.layout.list_item, databaseCursor, new String[] { "label",
"title", "description", "gotoURL" }, new int[] { R.id.label,
R.id.listTitle, R.id.caption, R.id.dummy });
And create a dummy (View.GONE) invisible field for it so that the data is pulled in the cursor.
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