android - 在操作栏中搜索无法与 ListView 的自定义适配器一起正常工作

Question

好吧，我正在尝试创建一个具有 listView 并且可以通过操作栏搜索选项进行搜索的 Activity 。

如果，我使用 android 的默认数组列表，它就可以正常工作。

但是当我尝试使用我自己的扩展 baseAdapter 的适配器时，它无法正常工作(无法正确搜索)。

我的全部代码在下面的链接中。

Link for my App

有人可以帮我解决这个问题吗？

代码是:

list ::

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.mysearchapp"
 android:versionCode="1"
 android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />

 <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".SecondActivity"
        android:label="@string/title_activity_second" >
        <intent-filter>
            <action android:name="android.intent.action.SEARCH" />

        </intent-filter>

        <meta-data
            android:name="android.app.searchable"
            android:resource="@xml/searchable" />

    </activity>
 </application>
</manifest>

菜单(res/menu/second.xml)::

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
    android:id="@+id/action_search"
    android:actionViewClass="android.widget.SearchView"
    android:icon="@drawable/ic_launcher"
    android:showAsAction="always"
    android:title="Search"/>

</menu>

布局(资源/布局)::

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >

 <ListView
    android:id="@+id/listview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:cacheColorHint="#00000000" />

 </RelativeLayout>

searchable.xml(在 res/xml 中)::

<searchable xmlns:android="http://schemas.android.com/apk/res/android"
  android:hint="search..."
  android:label="@string/app_name" />

自定义适配器::

        public class ImageAdapter extends BaseAdapter implements Filterable
{
        private Context context;
        private ArrayList<String> originalData = null;
        ArrayList<String> filteredData = null;

        ValueFilter valueFilter = new ValueFilter();

        public ImageAdapter(Context context, ArrayList<String> mobileValues) 
 {
            this.context = context;
            this.originalData = mobileValues;
            this.filteredData = mobileValues;
        }

        @Override
        public int getCount() {
            return filteredData.size();
        }

        @Override
        public Object getItem(int position) {
            return filteredData.get(position);
        }

        @Override
        public long getItemId(int position) {
            return filteredData.indexOf(getItem(position));
        }

        public View getView(int position, View convertView, ViewGroup parent) 
 {

            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View gridView;

            if (convertView == null) {

                gridView = new View(context);

                // get layout from mobile.xml
                gridView = inflater.inflate(R.layout.city_list_item, null);

                // set value into textview
                TextView textView = (TextView) gridView
                        .findViewById(R.id.grid_item_label);
                textView.setText(originalData.get(position));

                // set image based on selected text
                // ImageView imageView = (ImageView)
                // gridView.findViewById(R.id.grid_item_image);

                // imageView.setImageResource(R.drawable.city_image);

            } else {
                gridView = (View) convertView;
            }

            return gridView;
        }

        @Override
        public void notifyDataSetChanged() {
            super.notifyDataSetChanged();
        }

        @Override
        public Filter getFilter() {
            return valueFilter;
        }

        private class ValueFilter extends Filter {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                String filterString = constraint.toString().toUpperCase();

                FilterResults results = new FilterResults();

                /*
                 * if (constraint != null && constraint.length() > 0) {
                 */
                final ArrayList<String> lst = ImageAdapter.this.originalData;
                int count = lst.size();

                final ArrayList<String> filterList = new ArrayList<String>(count);

                String filterableString;

                for (int i = 0; i < count; i++) {
                    filterableString = lst.get(i);

                    if ((filterableString.toUpperCase()).contains(filterString)) {

                        filterList.add(filterableString);
                    }
                }
                results.count = filterList.size();
                results.values = filterList;
                /* } *//*
                         * else { results.count = mStringFilterList.size();
                         * results.values = mStringFilterList; }
                         */
                return results;

            }

            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence constraint,
                    FilterResults results) {
                filteredData = (ArrayList<String>) results.values;
                notifyDataSetChanged();
            }

        }
    }

和 Activity::

    public class SecondActivity extends Activity {

        // ArrayAdapter<String> myAdapter;
        ImageAdapter myAdapter;
        ListView listView;
        // String[] dataArray = new String[] {"India","Androidhub4you", "Pakistan",
        // "Srilanka", "Nepal", "Japan"};
        private ArrayList<String> dataArray = new ArrayList<String>();

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_second);

            dataArray.add("India");
            dataArray.add("Androidhub4you");
            dataArray.add("Pakistan");
            dataArray.add("Srilanka");
            dataArray.add("Nepal");
            dataArray.add("Japan");

            listView = (ListView) findViewById(R.id.listview);
            // myAdapter = new ArrayAdapter<String>(this,
            // android.R.layout.simple_list_item_1, dataArray);
            myAdapter = new ImageAdapter(SecondActivity.this, dataArray);
            listView.setAdapter(myAdapter);
            listView.setTextFilterEnabled(true);

            listView.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                        long arg3) {

                    System.out.println(arg2 + " --postion");
                }
            });
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.second, menu);

            SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
            SearchView searchView = (SearchView) menu.findItem(R.id.action_search)
                    .getActionView();

            searchView.setSearchableInfo(searchManager
                    .getSearchableInfo(getComponentName()));
            searchView.setIconifiedByDefault(false);

            SearchView.OnQueryTextListener textChangeListener = new SearchView.OnQueryTextListener() {
                @Override
                public boolean onQueryTextChange(String newText) {
                    // this is your adapter that will be filtered
                    myAdapter.getFilter().filter(newText);
                    System.out.println("on text chnge text: " + newText);
                    return true;
                }

                @Override
                public boolean onQueryTextSubmit(String query) {
                    // this is your adapter that will be filtered
                    myAdapter.getFilter().filter(query);
                    System.out.println("on query submit: " + query);
                    return true;
                }
            };
            searchView.setOnQueryTextListener(textChangeListener);

            return super.onCreateOptionsMenu(menu);

        }
    }

Answer 1

在你的适配器中移动这个

TextView textView = (TextView) gridView.findViewById(R.id.grid_item_label);
textView.setText(originalData.get(position));

就在返回语句之前。

getView 方法的工作原理:

如果一个 View 已经可用，则采用该 View ，如果不可用，则创建一个新 View 。现在适配器有一个 View ，用数据加载它。

完整代码

public View getView(int position, View convertView, ViewGroup parent) {
    View gridView;

    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        // gridView = new View(context); // this line is useless, you're overwriting the variable on the next line

        // inflate new layout
        // gridView = inflater.inflate(R.layout.city_list_item, null); // wrong
        gridView = inflater.inflate(R.layout.city_list_item, parent, false); // right
    } else {
        // reuse previously created view
        gridView = (View) convertView;
    }

    // set value into textview
    TextView textView = (TextView) gridView.findViewById(R.id.grid_item_label);
    textView.setText(originalData.get(position));

    // set image based on selected text
    //ImageView imageView = (ImageView) gridView.findViewById(R.id.grid_item_image);
    //imageView.setImageResource(R.drawable.city_image);

    // finding views all over again is not effective, google "viewholder"

    return gridView;
}

编辑:

要加载的正确项目不是来自原始数据集，而是来自过滤后的数据集。正确实现 String getItem(int) 方法后，始终在您的 View getView(int, View, parent) 中调用此方法。

textView.setText(getItem(position));