Question

我搜索了一个解决方案，以避免在动态创建的微调器上自动选择。我找到了链接：Spinner onItemSelected() executes when it is not suppose to

但是我无法在我的代码上使用它：

private void populateSpinner() {
        //Spinner spinnerKostenstellen;
        //spinnerKostenstellen = (Spinner) findViewById(R.id.spinner2);
        //spinnerKostenstellen = (Spinner) SpinnerLayout.findViewById(R.id.spinner2);

        AlertDialog.Builder adb2 = new AlertDialog.Builder(this);
        LayoutInflater adbInflater2 = LayoutInflater.from(this);
        View SpinnerLayout = adbInflater2.inflate(R.layout.spinner, null);
        adb2.setView(SpinnerLayout);
        adb2.setTitle("Kostenstelle auswählen:");
        spinnerKostenstellen = (Spinner) SpinnerLayout.findViewById(R.id.spinner2);
        spinnerKostenstellen.setSelection(1, false);
        spinnerKostenstellen.setOnItemSelectedListener(this);
        //spinnerKostenstellen.setCallbackDuringFling(false);
        List<String> lables = new ArrayList<String>();

        for (int i = 0; i < kostenstellenList.size(); i++) {
            lables.add(kostenstellenList.get(i).getKst());
        }

        // Creating adapter for spinner
        //ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);

        //ArrayAdapter<String> kostenstellenList = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);
        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, lables);
        // Drop down layout style - list view with radio button
        spinnerAdapter
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // attaching data adapter to spinner
        spinnerKostenstellen.setAdapter(spinnerAdapter);
        adb2.show();  
    }

Answer 1

代码下方的

（EDIT）隐藏了微调器的第一个空白值

List<String> urlist = new ArrayList<String>();
urlist.add("");   //  Initial dummy entry
urlist.add("yourstring1");
urlist.add("yourstring2");
urlist.add("yorustring3");


ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, urlist) {
    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent)
    {
        View v = null;

        // If this is the initial blnk entry, make it hidden
        if (position == 0) {
            TextView tv = new TextView(getContext());
            tv.setHeight(0);
            tv.setVisibility(View.GONE);
            v = tv;
        }
        else {
            // Pass convertView as null to prevent reuse of special case views
            v = super.getDropDownView(position, null, parent);
        }

        return v;
    }
};

dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySpinner.setAdapter(dataAdapter);

Answer 2

尝试在显示对话框后更改要设置的OnItemSelectedListener（在设置适配器后也是如此）。这应该可以防止微调器在用户选择之前触发其侦听器。 YOURCLASSNAME将是此代码所在的当前类的名称。

private void populateSpinner() {
    //Spinner spinnerKostenstellen;
    //spinnerKostenstellen = (Spinner) findViewById(R.id.spinner2);
    //spinnerKostenstellen = (Spinner) SpinnerLayout.findViewById(R.id.spinner2);

    AlertDialog.Builder adb2 = new AlertDialog.Builder(this);
    LayoutInflater adbInflater2 = LayoutInflater.from(this);
    View SpinnerLayout = adbInflater2.inflate(R.layout.spinner, null);
    adb2.setView(SpinnerLayout);
    adb2.setTitle("Kostenstelle auswählen:");
    spinnerKostenstellen = (Spinner) SpinnerLayout.findViewById(R.id.spinner2);
    spinnerKostenstellen.setSelection(1, false);
    //spinnerKostenstellen.setCallbackDuringFling(false);
    List<String> lables = new ArrayList<String>();

    for (int i = 0; i < kostenstellenList.size(); i++) {
        lables.add(kostenstellenList.get(i).getKst());
    }

    // Creating adapter for spinner
    //ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);

    //ArrayAdapter<String> kostenstellenList = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);
    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, lables);
    // Drop down layout style - list view with radio button
    spinnerAdapter
        .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    // attaching data adapter to spinner
    spinnerKostenstellen.setAdapter(spinnerAdapter);
    // use .create to get the AlertDialog 
    AlertDialog dialog =  adb2.create();
    // set an OnShowListener
    dialog.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {
            spinnerKostenstellen.setOnItemSelectedListener(YOURCLASSNAME.this);
        }
    });
    dialog.show();
}

在Spinner init上 - ＆gt;自动选择避免

2 个答案: