可搜索微调器在 android 中不起作用

Question

我有一个简单的微调器，我工作得很好。现在我想改变它，用户可以搜索其中的项目。按照下面的代码，我已经完成了更改。

示例代码

//Gradle

 compile 'com.toptoche.searchablespinner:searchablespinnerlibrary:1.3.1'

//activity_main.xml

 <com.toptoche.searchablespinnerlibrary.SearchableSpinner
    android:id="@+id/searchable_spinner"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
// In main activity 

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    SearchableSpinner searchableSpinner = (SearchableSpinner) findViewById(R.id.searchable_spinner);
    String[] names = new String[]{"India","CHINA","UK","US","MALYSIA"};
    ArrayAdapter arrayAdapter = new ArrayAdapter(MainActivity.this,android.R.layout.simple_spinner_dropdown_item,names);
    searchableSpinner.setAdapter(arrayAdapter);

    searchableSpinner.setTitle("Select Item");
    searchableSpinner.setPositiveButton("OK");

}

输出

点击dropdown

我做了什么？

//added the library in gradle 
compile 'com.toptoche.searchablespinner:searchablespinnerlibrary:1.3.1'

//new_form_layout (i have created this)
<com.toptoche.searchablespinnerlibrary.SearchableSpinner
                android:id="@+id/smart_msn_spinner"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="right|center_vertical"
                android:gravity="right" />

**In My Fragment**
@BindView(R.id.smart_msn_spinner)
SearchableSpinner smartMsnSpinner;

现在我创建了一个 bindListners() 函数，我在其中绑定了所有值，并在我的 onCreateView 函数中调用它

 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    if (view == null) {
        view = inflater.inflate(R.layout.new_form_layout, container, false);
        ButterKnife.bind(this, view);
        bindListners(); // here i am calling it
        imsiNo.setVisibility(View.GONE);
        setupUI(mScrollView);
    }
    Bundle arguments = getArguments();
    if (arguments != null && arguments.containsKey("install_id")) {
        isNewInstall = false;
        editInstallId = arguments.getString("install_id");
        getActivity().setTitle(getString(R.string.title_fragment_edit_form));
        setEditData();
        imsiNo.setVisibility(View.GONE);
        resetFormButton.setVisibility(View.GONE);
    } else {
        getActivity().setTitle(getString(R.string.title_fragment_new_form));
    }

    /*mCoordinatesReceiver = new CoordinatesReceiver();
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(Common.GetCoordinatesAction());
    getActivity().registerReceiver(mCoordinatesReceiver, intentFilter);*/
    return view;
}
bindListeners(){
.......

    //Searchable smartMsnSpinner spinner and adapter
    meterSrArrayList = new ArrayList<String>();

    meterSrNumAdapter = new ArrayAdapter<String>(getActivity(), R.layout.custom_spinner_layout, meterSrArrayList);
    smartMsnSpinner.setAdapter(meterSrNumAdapter);
    smartMsnSpinner.setTitle("Select Item");
    smartMsnSpinner.setPositiveButton("Ok");
    smartMsnSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            selectedMeterNo = meterSrArrayList.get(position);
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }

    });
 }

在运行我的应用程序时，我只是像以前一样获得简单的下拉列表。

我不知道是什么问题以及我缺少什么，因为我已经完成了示例中的所有内容。

我已经在我的设备中运行了示例代码，它运行良好。我不知道为什么它不能在我的应用上运行

更新

看完logcat我看到的错误是

Parcelable encountered IOException writing serializable object (name = com.toptoche.searchablespinnerlibrary.SearchableSpinner)

任何帮助将不胜感激。

Answer 1

我使用的是同一个库，但我没有这个问题。 无论如何，我在可视化、Parcelization 和 Re-Initializing 使用这个库的同一视图（向下滚动视图）方面都遇到了其他问题。

我个人扩展了“SearchableSpinner”并进行了以下更改：

public class BaseSearchableSpinner extends SearchableSpinner
    implements  SearchView.OnAttachStateChangeListener {

    private static final String TAG = BaseSearchableSpinner.class.getSimpleName();
    private static final String TAG_DIALOG = TAG.concat(".dialog");
    // Dialogs Tags
    private static final String TAG_DIALOG_SEARCHABLE_LIST = TAG_DIALOG.concat(".searchableList");
    // SearchableSpinner Fields
    private static final String FIELD_SEARCHABLE_LIST_DIALOG = "_searchableListDialog";
    private static final String FIELD_SEARCH_VIEW = "_searchView";
    private static final String FIELD_SEARCHABLE_ITEM = "_searchableItem";
    private static final String FIELD_ARRAY_ADAPTER = "_arrayAdapter";
    private static final String FIELD_ITEMS = "_items";

    private boolean mIsListDialogAdded;
    private boolean mIsListenerAdded;

    public BaseSearchableSpinner(Context context) {
        super(context);
        initListDialog();
    }

    public BaseSearchableSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);
        initListDialog();
    }

    public BaseSearchableSpinner(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initListDialog();
    }

    /** Override SearchableSpinner Methods **/
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        try{
            SearchableListDialog sld = (SearchableListDialog) FieldUtils.readField(this, FIELD_SEARCHABLE_LIST_DIALOG, true);
            ArrayAdapter adapter = (ArrayAdapter) FieldUtils.readField(this, FIELD_ARRAY_ADAPTER, true);
            List items = (List) FieldUtils.readField(this, FIELD_ITEMS, true);
            if (sld != null && adapter != null && items != null && event.getAction() == MotionEvent.ACTION_UP && checkIfListDialogNotAdded()) {
                if(mIsListenerAdded){
                    mIsListDialogAdded = true;
                }
                items.clear();
                for (int i = 0x0; i < adapter.getCount(); i++) {
                    items.add(adapter.getItem(i));
                }
                sld.show(scanForActivity(getContext()).getFragmentManager(), TAG_DIALOG_SEARCHABLE_LIST);
            }
        } catch (IllegalAccessException iaE){
            EMaxLogger.onException(TAG, iaE);
        }
        return true;
    }

    /** Override SearchView.OnAttachStateChangeListener Methods **/
    @Override
    public void onViewAttachedToWindow(View view) {
        mIsListDialogAdded = true;
    }

    @Override
    public void onViewDetachedFromWindow(View view) {
        mIsListDialogAdded = false;
    }

    /** Private Methods **/
    private void initListDialog(){
        try{
            SearchableListDialog oldD = (SearchableListDialog) FieldUtils.readField(this, FIELD_SEARCHABLE_LIST_DIALOG, true);
            if(oldD != null) {
                BaseSearchableListDialog newD = new BaseSearchableListDialog(this);
                newD.setArguments(oldD.getArguments());
                newD.setOnSearchableItemClickListener(this);
                FieldUtils.writeField(this, FIELD_SEARCHABLE_LIST_DIALOG, newD, true);
            }
        } catch (IllegalAccessException iaE){
            EMaxLogger.onException(TAG, iaE);
        }
    }

    private void initListenerOnCloseSearchView(SearchableListDialog instance) {
        try{
            SearchView sv = (SearchView) FieldUtils.readField(instance, FIELD_SEARCH_VIEW, true);
            if(sv != null){
                sv.addOnAttachStateChangeListener(this);
                mIsListenerAdded = true;
            }
        } catch (IllegalAccessException iaE){
            EMaxLogger.onException(TAG, iaE);
        }
    }

    private boolean checkIfListDialogNotAdded(){
        return !mIsListDialogAdded && scanForActivity(getContext()).getFragmentManager().findFragmentByTag(TAG_DIALOG_SEARCHABLE_LIST) == null;
    }

    private Activity scanForActivity(Context cont) {
        if (cont == null)
            return null;
        else if (cont instanceof Activity)
            return (Activity) cont;
        else if (cont instanceof ContextWrapper)
            return scanForActivity(((ContextWrapper) cont).getBaseContext());
        return null;
    }

    /** Private Classes  **/
    @SuppressLint("ValidFragment")
    public static class BaseSearchableListDialog extends SearchableListDialog {

        private BaseSearchableSpinner mOuter;

        private BaseSearchableListDialog(BaseSearchableSpinner bss){
            super();
            mOuter = bss;
        }

        /** Override SearchableListDialog Methods **/
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            AlertDialog dialog = (AlertDialog) super.onCreateDialog(savedInstanceState);
            mOuter.initListenerOnCloseSearchView(this);
            return dialog;
        }

    }

}

尝试使用它，看看它是否有效。

此外，我将适配器更改为具有自定义文本，并且并不总是显示对象的“toString”：/ 我通常仅将 toString 用于调试目的，因此为了显示有关对象的信息，我使用了特定的方法。

这是适配器的类：

public abstract class BaseSearchableSpinnerAdapter<T> extends ArrayAdapter<CharSequence> {

    // Empty Item Label
    protected static final String LABEL_EMPTY_ITEM = "                                                                           ";
    // Label Length
    protected static final int LABEL_LENGTH = 50;
    // Spinner Adapter Positions
    public static final int POS_ITEM_NOT_FOUND = -0x1;
    public static final int POS_EMPTY_ITEM = 0x0;       // Not always true, depends if implemented

    protected List<T> mItems;
    private int mResLayout;

    public BaseSearchableSpinnerAdapter(@NonNull Context context, @LayoutRes int resource) {
        super(context, resource);
        mItems = new ArrayList<>();
        mResLayout = resource;
    }

    /** Abstract Methods **/
    public abstract <T extends CharSequence> T getLabelView(int pos);

    /** Override ArrayAdapter Methods **/
    @NonNull
    @Override
    public View getView(int position, View convertView, @NonNull ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(mResLayout, parent, false);
            if (convertView == null) {
                convertView = LayoutInflater.from(getContext()).inflate(R.layout.spinner_default, parent, false);
            }
        }
        TextView tv = convertView.findViewById(R.id.text1);
        if(tv != null){
            tv.setText(getLabelView(position));
        }
        return convertView;
    }

    @Override
    public void clear(){
        mItems.clear();
        super.clear();
    }

    /** Public Methods **/
    public void addAll(List<T> objs){
        clear();
        ArrayList<CharSequence> labels = new ArrayList<>();
        if(objs != null && objs.size() > 0x0){
            mItems.addAll(objs);
            for(int i = 0x0; i < objs.size(); i++){
                labels.add(getLabelView(i));
            }
        }
        super.addAll(labels);
    }

    public T getMyItem(int pos){
        if(mItems != null && mItems.size() > pos && pos != -0x1){
            return mItems.get(pos);
        }
        return null;
    }

    public List<T> getMyItems(){
        return mItems;
    }

}

扩展这个类并使用你想要的对象。 LABEL_EMTPY_ITEM 是一长串空格，因为在某些应用程序中，当文本没有占据列表视图中的所有行时，它只能在文本上而不是所有行上可点击。所以当你没有项目时，可点击部分这条线的左边是一小块（在我的情况下，我遇到了这个问题）。

扩展此适配器基类的示例：

public class MyObjectSearchableSpinnerAdapter extends BaseSearchableSpinnerAdapter<MyObject> {

    private @StringRes int mIdFstr;

    public MyObjectSearchableSpinnerAdapter(@NonNull Context context, @LayoutRes int resource){
        this(context, resource, R.string.fstr_two_fields_dash);
    }

    public MyObjectSearchableSpinnerAdapter(@NonNull Context context, @LayoutRes int resource, int idFstr){
        super(context, resource);
        mIdFstr = idFstr;
    }

    /** Override BaseSearchableSpinnerAdapter Methods **/
    @Override
    public <T extends CharSequence> T getLabelView(int pos) {
        MyObject item = mItems.get(pos);
        if(item != null){
            return (T) (!TextUtils.isEmpty(item.getName2()) ?
                            getContext().getString(mIdFstr, item.getName1(), item.getName2()) :
                            item.getName1());
        }
        return (T) LABEL_EMPTY_ITEM;
    }

    /** Public Methods **/
    public int getItemPosition(int idMyObject){
        return getItemPosition(String.valueOf(idMyObject));
    }

    public int getItemPosition(String idMyObject){
        if(mItems != null && mItems.size() > 0x0){
            for(int i = 0x0; i < mItems.size(); i++){
                MyObject item = mItems.get(i);
                if(item != null && idMyObject.equals(item.getId())){
                    return i;
                }
            }
        }
        return POS_ITEM_NOT_FOUND;
    }

}

示例初始化 BaseSearchableSpinner：

private void initBaseSearchableSpinnerMyObjects(){
        MyObjectSearchableSpinnerAdapter adapter = new MyObjectSearchableSpinnerAdapter(getContext(), R.layout.spinner_default);
        adapter.setDropDownViewResource(R.layout.spinner_default);
        mBaseSearchableSpinnerMyObjects.setAdapter(adapter);
    }

示例将您的 MyObject 列表添加到适配器：

((MyObjectSearchableSpinnerAdapter)mBaseSearchableSpinnerMyObjects.getAdapter()).addAll(items);

示例从 BaseSearchableSpinner 中取回一个对象，该对象具有 BaseSearchableAdapter 的扩展名和 MyObject 列表：

MyObject obj = ((MyObjectSearchableSpinnerAdapter) mBaseSearchableSpinnerMyObjects.getAdapter()).getMyItem(mBaseSearchableSpinnerMyObjects.getSelectedItemPosition());

祝您编码愉快！ bb