Android 我无法使用游标适配器从ListView表单中的db中的2个字段中获取数据

我想要，使用Cursoradapter从列表视图上的数据库中获取两个字段的数据。 我能够使用Cursoradapter从数据库中获取单个字段的数据

在这里，我想在列表视图中显示两个字段的数据，即Constants.file\u name和Constants.url\u path

dba = new MyDB(this);

dba.open();

mQuery = "Select " + Constants.DOCU_ID + ","
        + Constants.FILE_NAME
        + ","
        + Constants.URL_PATH
        + " from "
        + Constants.TABLE_NAME_DOCU 
        + " where " + Constants.KEY_ID_CONTACT_DOCU
        + " = " + mContactKeyID;

c = dba.getResults(mQuery);
startManagingCursor(c);

String[] resultColumns;

if (c != null && c.moveToFirst()) {

}

int[] textviews = new int[] { android.R.id.text1, android.R.id.text2};
resultColumns = new String[] { Constants.FILE_NAME, Constants.URL_PATH };
mAdapter = new SimpleCursorAdapter(this,
        android.R.layout.simple_list_item_1, c,
        resultColumns, textviews);
this.setListAdapter(mAdapter);

getListView().setTextFilterEnabled(true);

这里我使用游标检索数据..但url\u路径不是重试

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {
    // TODO Auto-generated method stub
    super.onItemClick(parent, view, position, id);
    final Cursor c = (Cursor) mAdapter
            .getItem(position);
    uname = c.getString(c.getColumnIndex(Constants.FILE_NAME));
    docuId = c.getInt(c
            .getColumnIndex(Constants.DOCU_ID));
    urlPath = c.getString(c.getColumnIndex(Constants.URL_PATH));

---

怎么了？您可以使用DatabaseUtilsdumpCurrentRow调试光标数据在我的示例中，此字段中的一个在ListView上显示为空您是否在onItemClick内调用DatabaseUtilsdumpCurrentRow？您是否可以编写我不懂的语法…在onItemClick方法内调用DatabaseUtilsdumpCurrentRow方法，这里不清楚什么？

     09-23 17:56:07.756: E/AndroidRuntime(2776): FATAL EXCEPTION: main
09-23 17:56:07.756: E/AndroidRuntime(2776): Process: com.cbsinfosys.FieldWorkMobility, PID: 2776
09-23 17:56:07.756: E/AndroidRuntime(2776): java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.contains(java.lang.CharSequence)' on a null object reference
09-23 17:56:07.756: E/AndroidRuntime(2776):     at com.cbsinfosys.FieldWorkMobility.ViewBrowse$1.onClick(ViewBrowse.java:383)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at android.view.View.performClick(View.java:4780)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at android.view.View$PerformClick.run(View.java:19866)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at android.os.Handler.handleCallback(Handler.java:739)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at android.os.Handler.dispatchMessage(Handler.java:95)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at android.os.Looper.loop(Looper.java:135)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at android.app.ActivityThread.main(ActivityThread.java:5257)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at java.lang.reflect.Method.invoke(Native Method)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at java.lang.reflect.Method.invoke(Method.java:372)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
09-23 17:56:07.756: E/AndroidRuntime(2776):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)