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我找到了恢复我的价值观的解决方案，请查看我的 populateFields() 新版本 好的，所以我一直在阅读此处的所有 Spinner 和 SQlite 帖子，似乎无法为我正在寻找的内容找到一个好的答案，所以我发布这种情况。我的应用程序有两个屏幕，并使用我设备上的 sqlite 数据库将 editTexts 中的名称和权重字段保存为字符串，如下所示

String eName = name.getText().toString();
String eWeight = weight.getText().toString();// where name and weight are EditTexts

我有两个微调器如下

String eReps = spinReps.getSelectedItem().toString();
String eSets = spinSets.getSelectedItem().toString();

然后我调用它来添加到数据库中

long id = mDbHelper.createExercise(eName, eWeight, eReps, eSets);

这是我的问题所在，当有人选择创建新练习时，我的应用程序崩溃，因为它试图错误地填充微调器。这是我目前所拥有的。

private void populateFields(){
  if(mRowId != null){ // where mRowId is the selected row from the list
    Cursor exercise = mDbHelper.fetchExercise();
    name.setText(exercise.getString(exercise.
                 getColumnIndexOrThrow(ExerciseDbAdapter.KEY_NAME)));
    weight.setText(exercise.getString(exercise.
                 getColumnIndexOrThrow(ExerciseDbAdapter.KEY_WEIGHT)));
// this is the part that i need help with, I do not know how to restore 
// the current items spinner value for reps and sets from the database.

    spinReps.setSelection(exercise.getString(exercise.
                 getColumnIndexOrThrow(ExerciseDbAdapter.KEY_REPS)));

    spinSets.setSelection(exercise.getString(exercise.
                 getColumnIndexOrThrow(ExerciseDbAdapter.KEY_SETS))); 
}

I assume I need to use some sort of adapter to restore my list items along with the current value from the database, I am just not sure how.

Can someone please help me with this???

** BELOW IS MY SOLUTION**

I had to move my ArrayAdapters repsAdapter, spinAdapter out of my onCreate() and then implement this new populateFields()

 private void populateFields(){
    if(mRowId != null){
        Cursor exercise = mDbHelper.fetchExercise(mRowId);
       // same as before
        name.setText(exercise.getString(exercise.
                         getColumnIndexOrThrow(ExerciseDbAdapter.KEY_NAME)));
       // get the string for sReps and sSets from the database
        String sReps = exercise.getString(exercise.
                         getColumnIndexOrThrow(ExerciseDbAdapter.KEY_REPS));
        String sSets = exercise.getString(exercise.
                         getColumnIndexOrThrow(ExerciseDbAdapter.KEY_SETS));
       // use the strings to get their position in my adapters
        int r = repsAdapter.getPosition(sReps);
        int s = setsAdapter.getPosition(sSets);
       // set their returned values to the selected spinner Items
        spinReps.setSelection(r);
        spinSets.setSelection(s);
       // same as before
        weight.setText(exercise.getString(exercise.
                         getColumnIndexOrThrow(ExerciseDbAdapter.KEY_WEIGHT)));
    }
}
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1 回答 1

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The way to set a Spinner to a value, not a position, depends on what adapter you are using.

  1. ArrayAdapter, this one is easy:

    int position = adapter.getPosition(exercise.getString(exercise.
                 getColumnIndexOrThrow(ExerciseDbAdapter.KEY_REPS)));
spinReps.setSelection(position);

  2. SimpleCursorAdapter, this one is a little harder:

    String match = exercise.getString(exercise.getColumnIndexOrThrow(ExerciseDbAdapter.KEY_REPS));

Cursor cursor = adapter.getCursor();
cursor.moveToPosition(-1);
int columnIndex = cursor.getColumnIndexOrThrow(ExerciseDbAdapter.KEY_REPS);
while(cursor.moveToNext()) {
    if(cursor.getString(columnIndex).equals(match))
        break;
}
spinReps.setSelection(cursor.getPosition());

If you are using a different type of adapter and can't modify the code above to fit it, let me know. Hope that helps!

于 2012-08-08T18:34:53.603 回答