java - Uri 引起的 CursorIndexOutOfBoundsException

Question

这是我的 LogCat 日志:

08-25 22:35:27.989: ERROR/AndroidRuntime(327): Caused by: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 3 

这是获取光标的 onCreate(Bundle) 方法:

private static final String[] PROJECTION = { 
    Formulas._ID, Formulas.TITLE, Formulas.FORMULA 
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Uri uri = getIntent().getData();

    Cursor formulaCursor = managedQuery(uri, PROJECTION, null, null, null);

    String formulaName = formulaCursor.getString(formulaCursor.getColumnIndex(Formulas.TITLE));
    String formula = formulaCursor.getString(formulaCursor.getColumnIndex(Formulas.FORMULA));

    ((TextView) findViewById(R.id.formula)).setText(formula);
    ((TextView) findViewById(R.id.formula_name)).setText(formulaName);
}

这是我实际开始 Activity 的地方:

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Uri formula = ContentUris.withAppendedId(getIntent().getData(), id);
    startActivity(new Intent(Intent.ACTION_VIEW, formula));
}

我已经拥有自己的内容提供商，并且已正确设置它。

Answer 1

您没有执行formulaCursor.moveToFirst()？