setOnitemSelectedListener 不会通过以编程方式创建的微调器 Android 触发

Question

My need is to

1. create a dynamic spinner on a button click
2. select the spinner values and set the values into an edit text field.

For this I have created a dynamic spinner programatically. Put that code inside button click listener. Its working fine upto here.

but the setOnitemSelectedListener of the dynamic spinner is not at all working.. there are no errors in the Logcat... please help me..

------------ These are the methods inside onCreate ------------

Spinner spnOutHospitalList = new Spinner(Referance.this);

// list button on click event
btnList = (Button) findViewById(R.id.btn_list);
btnList.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
    // TODO Auto-generated method stub
    // function to create spinner dynamically
    createDynamicSpinner();
    }
});

// Out Hospital List Spinner on item click listener
spnOutHospitalList.setOnItemSelectedListener(new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long arg3) {
    // TODO Auto-generated method stub
    outHospitalName = hospitalNameListArray.get(position);
    outHospital.setText(outHospitalName);
    }
    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub
    }
});



------------ These are the functions outside onCreate but inside the Activity------------


// to create spinner dynamically
private void createDynamicSpinner() {
    // TODO Auto-generated method stub
    spnOutHospitalList.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    loadOutHospitalListSpinner();
    spnOutHospitalList.performClick();
}

// to load out hospital/ clinic data into spinner
private void loadOutHospitalListSpinner() {
    // TODO Auto-generated method stub
    try {
        if (getFirstRun()) {
        sampleDB = dbAdapter.getDatabase();
        setRunned();
        } 
        else {
        sampleDB = dbAdapter.getWritableDatabase();
        }
        Cursor c1 = sampleDB.rawQuery("select DISTINCT EPR_OUT_HOSPITAL from EMR_PT_REFERNCE",null);
        System.out.println("count is " + c1.getCount());

        if (c1 != null && c1.getCount() != 0) {
            hospitalNameListArray.clear();
                if (c1.moveToFirst()) {
                    do {
                        hospitalNameListArray.add(c1.getString(c1.getColumnIndex("EPR_OUT_HOSPITAL")));
                    } while (c1.moveToNext());  
                }
            }
            c1.close();

            ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, hospitalNameListArray);

            // dropdownlist
            dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

            spnOutHospitalList.setAdapter(dataAdapter);

        } 
        catch (Exception e) {
            // TODO: handle exception
            System.out.println("CAT LIST ERROR IS: " + e.getMessage());
        }

    }

Answer 1

Try this

Write setOnItemSelectedListener inside createDynamicSpinner

private void createDynamicSpinner() {

//Remove this line from top in your code and add here
Spinner spnOutHospitalList = new Spinner(Referance.this);

    spnOutHospitalList.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

    //Pass Spinner Object to this function to load data in it!
    loadOutHospitalListSpinner(spnOutHospitalList);
    spnOutHospitalList.performClick();

spnOutHospitalList.setOnItemSelectedListener(new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long arg3) {
    // TODO Auto-generated method stub
    outHospitalName = hospitalNameListArray.get(position);
    outHospital.setText(outHospitalName);
    }
    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub
    }
});
}