android.support.v7.widget.AppCompatSpinner#setOnItemSelectedListener ( )源码实例Demo

private AppCompatSpinner setDropDownList(int dropDownListId, List<String> data, AdapterView.OnItemSelectedListener itemSelectedListener) {
    AppCompatSpinner spinner = mRootView.findViewById( dropDownListId );
    if ( spinner == null ) {
        return null;
    }

    ArrayAdapter<String> adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_spinner_item, data);
    adapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
    spinner.setAdapter( adapter );

    if ( itemSelectedListener != null ) {
        spinner.setOnItemSelectedListener(itemSelectedListener);
    }

    return spinner;
}
 

private AppCompatSpinner addSpinnerData(int spinnerViewId, List<String> list, int curPosition,
                                        AdapterView.OnItemSelectedListener itemSelectedListener) {
    if ( list == null ) return null;

    ArrayAdapter<String> adapter = new ArrayAdapter<>( this, android.R.layout.simple_spinner_item, list);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    AppCompatSpinner spinner = findViewById( spinnerViewId);
    spinner.setAdapter( adapter );

    if ( (curPosition >= 0) && ( curPosition < list.size()) ){
        spinner.setSelection(curPosition);
    }

    spinner.setOnItemSelectedListener( itemSelectedListener );

    return spinner;
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sample_activity);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    mSpinnerDelay = (AppCompatSpinner) findViewById(R.id.spinner_delay);
    mSpinnerSlide = (AppCompatSpinner) findViewById(R.id.spinner_slide);
    mSpinnerDelay.setAdapter(new ArrayAdapter<>(this, R.layout.spinner, mDelayGravities));
    mSpinnerSlide.setAdapter(new ArrayAdapter<>(this, R.layout.spinner, mSlideGravities));
    mSpinnerDelay.setSelection(1);
    mSpinnerSlide.setSelection(1);
    mSpinnerDelay.setOnItemSelectedListener(this);
    mSpinnerSlide.setOnItemSelectedListener(this);

    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    mRecyclerView.setAdapter(new Adapter());
    startMaterialIn();
}
 

@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    View rootView = LayoutInflater.from(getContext()).inflate(R.layout.dialog_feedback_layout, null);

    feedback = feedback == null ? ModelFactory.getFeedback() : feedback;
    feedback.setFeedbackType(FeedbackType.ABRUPT_CRASH);

    etEmail = rootView.findViewById(R.id.et_email);
    TextInputLayout tilEmail = rootView.findViewById(R.id.til_email);
    etEmail.addTextChangedListener(new EmailFormatWatcher(tilEmail));
    etQuestion = rootView.findViewById(R.id.et_question);
    WatcherTextView wtQuestion = rootView.findViewById(R.id.wt_question);
    wtQuestion.bindEditText(etQuestion);
    AppCompatSpinner spFeedbackTypes = rootView.findViewById(R.id.sp_feedback_types);
    spFeedbackTypes.setOnItemSelectedListener(this);

    return new AlertDialog.Builder(getContext())
            .setTitle(R.string.feedback)
            .setView(rootView)
            .setPositiveButton(R.string.text_send, (dialog, which) -> {
                if (!checkInput()) return;
                if (onSendClickListener != null) onSendClickListener.onSend(FeedbackDialog.this, feedback);
            })
            .setNegativeButton(R.string.text_cancel, null)
            .create();
}
 

private void initSpinner(final AppCompatSpinner sp, List<String> list, String key, final Callback callback) {
    if (list == null) return;
    Camera.Parameters cameraParameters = mCameraController.getCameraParameters();
    final ArrayAdapter<String> adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, list);
    sp.setAdapter(adapter);
    sp.setSelection(adapter.getPosition(cameraParameters.get(key)), false);
    sp.setOnItemSelectedListener(new SimpleItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            callback.set(adapter.getItem(position));
        }
    });
}
 

@Override
public void setupView(View view) {
    AppCompatSpinner spinner = (AppCompatSpinner)view.findViewById(R.id.settings_spinner);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(onItemSelectedListener);
    if (selectedPos != -1)
        spinner.setSelection(selectedPos);
}
 

/**
 * Initializes the spinner for the download filter.
 * @param adapter The adapter associated with the spinner.
 */
public void initializeFilterSpinner(FilterAdapter adapter) {
    mSpinner = new AppCompatSpinner(this.getContext());
    mSpinner.setAdapter(adapter);
    mSpinner.setOnItemSelectedListener(adapter);
    addView(mSpinner);
}