Question

Spinner的代码如下：

String[] countryNames = {"Select Country", "India", "China", "Australia",   "Portugle", "America", "New Zealand"};

Spinner spinner = (Spinner) findViewById(R.id.simpleSpinner);
hintAdapter = new CustomArrayAdapter(getApplicationContext(), R.layout.simple_row,countriesList,getApplicationContext());
spinner.setAdapter(hintAdapter);

我想在Spinner中实施搜索。

我怎样才能做到这一点？

Answer 1

使用SearchableSpinner Lib，有可用的SearchableSpinner库列表，只需选择其中一个更好的https://github.com/search?utf8=%E2%9C%93&q=searchable+spinner

Answer 2

转到AutocompleteTextview this example will help you

Answer 3

我找到了以下解决方案here：

/**
* A modified Spinner that doesn't automatically select the first entry in the list.
*
* Shows the prompt if nothing is selected.
*
* Limitations: does not display prompt if the entry list is empty.
*/
public class NoDefaultSpinner extends Spinner {

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

public NoDefaultSpinner(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

@Override
public void setAdapter(SpinnerAdapter orig ) {
    final SpinnerAdapter adapter = newProxy(orig);

    super.setAdapter(adapter);

    try {
        final Method m = AdapterView.class.getDeclaredMethod(
                           "setNextSelectedPositionInt",int.class);
        m.setAccessible(true);
        m.invoke(this,-1);

        final Method n = AdapterView.class.getDeclaredMethod(
                           "setSelectedPositionInt",int.class);
        n.setAccessible(true);
        n.invoke(this,-1);
    } 
    catch( Exception e ) {
        throw new RuntimeException(e);
    }
}

protected SpinnerAdapter newProxy(SpinnerAdapter obj) {
    return (SpinnerAdapter) java.lang.reflect.Proxy.newProxyInstance(
            obj.getClass().getClassLoader(),
            new Class[]{SpinnerAdapter.class},
            new SpinnerAdapterProxy(obj));
}



/**
 * Intercepts getView() to display the prompt if position < 0
 */
protected class SpinnerAdapterProxy implements InvocationHandler {

    protected SpinnerAdapter obj;
    protected Method getView;


    protected SpinnerAdapterProxy(SpinnerAdapter obj) {
        this.obj = obj;
        try {
            this.getView = SpinnerAdapter.class.getMethod(
                             "getView",int.class,View.class,ViewGroup.class);
        } 
        catch( Exception e ) {
            throw new RuntimeException(e);
        }
    }

    public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
        try {
            return m.equals(getView) && 
                   (Integer)(args[0])<0 ? 
                     getView((Integer)args[0],(View)args[1],(ViewGroup)args[2]) : 
                     m.invoke(obj, args);
        } 
        catch (InvocationTargetException e) {
            throw e.getTargetException();
        } 
        catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    protected View getView(int position, View convertView, ViewGroup parent) 
      throws IllegalAccessException {

        if( position<0 ) {
            final TextView v = 
              (TextView) ((LayoutInflater)getContext().getSystemService(
                Context.LAYOUT_INFLATER_SERVICE)).inflate(
                  android.R.layout.simple_spinner_item,parent,false);
            v.setText(getPrompt());
            return v;
        }
        return obj.getView(position,convertView,parent);
    }
}
}

Answer 4

尝试了许多库和方法之后，我终于创建了自定义可搜索微调器。我要附加的代码处于非常初步的水平，我将在项目中进行更新。我也在写有关如何使用它的完整方法。

所有布局 searchable_spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <EditText
        android:id="@+id/spinner_search_bar"
        android:layout_width="match_parent"
        android:layout_height="35dp"
        android:hint="Select A Company"
        android:cursorVisible="false"
        android:background="@drawable/white_rect_fillet_border"
        android:paddingHorizontal="10dp"/>
    
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/ledger_list"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:visibility="gone"
        android:layout_marginHorizontal="10dp"/>
</LinearLayout>
</FrameLayout>

actity_or_frag_layout.xml 请记住最后添加它，并根据您的父级布局进行对齐。

<FrameLayout
    android:id="@+id/spinner_frame"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginHorizontal="10dp"
    android:layout_marginTop="10dp"
    android:background="@drawable/white_rect_fillet_border"
    app:layout_constraintTop_toTopOf="parent">

    <include layout="@layout/searchable_spinner" />
</FrameLayout>

list_adapter_element.xml

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
<TableRow>
    <TextView
        android:id="@+id/txt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingVertical=5dp"
        android:gravity="center_vertical"/>
</TableRow>
</TableLayout>

所有可绘制对象 white_rect_fillet_border.xml

<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@android:color/white"/>
    <corners android:radius="5dp" />
    <stroke android:color="@android:color/darker_gray"
        android:width="1dp" />
</shape>

CustomListAdapter.java

public class CustomListAdapter extends 
RecyclerView.Adapter<CustomListAdapter.ViewHolder> {
private final Activity context;
private Fragment fragment;
private ArrayList<LedgerListObject> ledgerlist; //replace LedgerListObject with your object or simply String everywhere in this code.

public CustomListAdapter(Activity context, Fragment fragment, 
ArrayList<LedgerListObject> ledgerlist) {
    this.context = context;
    this.fragment = fragment;
    this.ledgerlist = ledgerlist;
}


public void updateList(ArrayList<LedgerListObject> newList){
    ledgerlist = newList;
    notifyDataSetChanged();
}

@NonNull
@Override
public CustomListAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    LayoutInflater inflater = context.getLayoutInflater();
    View rowView= inflater.inflate(R.layout.list_adapter_element, null, true);
    return new ViewHolder(rowView);
}

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, final int position) {
    holder.txtTitle.setText(ledgerlist.get(position).LedgerName);
    holder.txtTitle.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            MyFragment.LedgerID = ledgerlist.get(position).LedgerID;  //MyFragment can be replaced with the name of your activity or fragment 
            MyFragment.ledgerListView.setVisibility(View.GONE);
            MyFragment.spinnerSearch.setText(ledgerlist.get(position).LedgerName);
            MyFragment.spinnerSearch.setCursorVisible(false);
        }
    });
}


@Override
public int getItemCount() {
    return ledgerlist.size();
}

class ViewHolder extends RecyclerView.ViewHolder {

    TextView txtTitle;
    ViewHolder(@NonNull View itemView) {
        super(itemView);
        txtTitle = (TextView) itemView.findViewById(R.id.txt);
    }
}
}

MyFragment.java

public class MyFragment extends Fragment{
ArrayList<LedgerListObject> ledgerlist = new ArrayList<LedgerListObject>();
public static int LedgerID = 0;
CustomListAdapter ledgerAdapter;

FrameLayout spinnerFrame;
public static EditText spinnerSearch;
public static RecyclerView ledgerListView;

 @SuppressLint("ClickableViewAccessibility")
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState){
    View root = inflater.inflate(R.layout.fragment_ledger, container, false);
    super.onCreate(savedInstanceState);
    spinnerFrame = root.findViewById(R.id.spinner_frame);
    spinnerSearch = root.findViewById(R.id.spinner_search_bar);
    ledgerListView = root.findViewById(R.id.ledger_list);
    spinnerSearch.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            ledgerListView.setVisibility(View.VISIBLE);
            spinnerSearch.setCursorVisible(true);
            return false;
        }
    });

    spinnerSearch.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) 
{

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            try{
                filter(s.toString());
            }catch (Exception e){e.printStackTrace();}
        }
    });

    GridLayoutManager listgridLayoutManager = new GridLayoutManager(getContext(), 1, 
    RecyclerView.VERTICAL, false);
    ledgerListView.setLayoutManager(listgridLayoutManager);

    //todo: your method of adding objects to your ledgerlist

    ledgerAdapter = new CustomListAdapter(getActivity(), LedgerFragment.this, ledgerlist);
            ledgerListView.setAdapter(ledgerAdapter);
    return root;
}
}

尝试一下，如果有任何问题，请随时提出，我会解决的

如何在Android中使用Spinner实现搜索？

4 个答案: