android - 使用 EditText 过滤支持 SimpleCursorAdapter 的 ListView

Question

我有一个 ListView，它带有由 SimpleCursorAdapter 支持的自定义项目布局。我希望用户能够在 EditText 框中键入文本，并让 ListView 在他们键入时自动进行过滤。看起来使用 ArrayAdapter 非常简单，如所述 here .

不幸的是，我没有运气让它与 SimpleCursorAdapter 一起工作。我已尝试添加额外的方法，如 here 所述，但该示例适用于 AutoCompleteTextView 而不是 ListView。我的 ListView 无法正常工作。

有人可以给我提供一个使用 EditText 框过滤 SimpleCursorAdapter 支持的 ListView 的示例吗？

public class DirectoryListActivity extends DirectoryActivity {

    private static SimpleCursorAdapter adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.directory_list);

        fillPeopleListView();

        EditText etext=(EditText)findViewById(R.id.search_box);
        etext.addTextChangedListener(new TextWatcher() {

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


            }

            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {


            }

            public void afterTextChanged(Editable s) {
                adapter.getFilter().filter(s.toString());

            }
        });

    }

    private void fillPeopleListView() {
        // Populate the ListView
        SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
        queryBuilder.setTables(
            directoryPeople.PEOPLE_TABLE
        );

        String asColumnsToReturn[] = { 
                directoryPeople.PEOPLE_TABLE + "."
                + directoryPeople.LAST_NAME + "," +
                directoryPeople.PEOPLE_TABLE + "."
                + directoryPeople.FIRST_NAME + "," +
                directoryPeople.PEOPLE_TABLE + "."
                + directoryPeople.MIDDLE_NAME + "," +
                directoryPeople.PEOPLE_TABLE + "."
                + directoryPeople.JOB_TITLE + "," +
                directoryPeople.PEOPLE_TABLE + "."
                + directoryPeople._ID
        };

        mCursor = queryBuilder.query(mDB, asColumnsToReturn, null, null,
                null, null, directoryPeople.DEFAULT_SORT_ORDER);

        startManagingCursor(mCursor);

        adapter = new SimpleCursorAdapter(this,
                R.layout.directory_people_item, mCursor,
                new String[]{
                    directoryPeople.LAST_NAME,
                    directoryPeople.FIRST_NAME,
                    directoryPeople.MIDDLE_NAME,
                    directoryPeople.JOB_TITLE},
                new int[]{
                    R.id.txtLastName,
                    R.id.txtFirstName,
                    R.id.txtMiddle,
                    R.id.txtTitle} 
        ); 

        ListView av = (ListView)findViewById(R.id.listPeople);
        av.setAdapter(adapter);
        av.setFastScrollEnabled(true);

        adapter.setFilterQueryProvider(new FilterQueryProvider() {

            public Cursor runQuery(CharSequence constraint) {
                String partialValue = constraint.toString();

                SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();

                String asColumnsToReturn[] = { 
                        directoryPeople.PEOPLE_TABLE + "."
                        + directoryPeople.LAST_NAME + "," +
                        directoryPeople.PEOPLE_TABLE + "."
                        + directoryPeople.FIRST_NAME + "," +
                        directoryPeople.PEOPLE_TABLE + "."
                        + directoryPeople.MIDDLE_NAME + "," +
                        directoryPeople.PEOPLE_TABLE + "."
                        + directoryPeople.JOB_TITLE + "," +
                        directoryPeople.PEOPLE_TABLE + "."
                        + directoryPeople._ID
                };

                Cursor c = queryBuilder.query(mDB, asColumnsToReturn, directoryPeople.LAST_NAME + " LIKE " + partialValue, null,
                        null, null, directoryPeople.DEFAULT_SORT_ORDER);


                return c;
            }
        });

根据要求，这是我的布局代码。主要布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@android:color/white">
    <include android:id="@+id/lytHeadBar" layout="@layout/headbar" />
    <include android:id="@+id/lytTitleBar" layout="@layout/titlebar" />
    <EditText android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Type a name..."
        android:maxLines="1" android:inputType="textFilter|textCapWords" android:id="@+id/search_box"/>
    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listPeople"
        android:divider="@android:drawable/divider_horizontal_dark"
        android:cacheColorHint="@android:color/white" />
</LinearLayout>

列表项布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/lytItem"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    android:background="@drawable/item_line_bottom">
    <LinearLayout android:id="@+id/nameLine"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:orientation="horizontal">
            <TextView
                android:id="@+id/txtLastName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:textStyle="bold"
                android:textColor="@android:color/black"
                android:text="lastname" />
            <TextView
                android:id="@+id/nameSpace1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:textSize="20sp"
                android:textColor="@android:color/black"
                android:text=", " />
            <TextView
                android:id="@+id/txtFirstName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:textSize="20sp"
                android:textColor="@android:color/black"
                android:text="firstname" />
            <TextView
                android:id="@+id/nameSpace2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:textSize="20sp"
                android:textColor="@android:color/black"
                android:text=" " />
            <TextView
                android:id="@+id/txtMiddle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:textSize="20sp"
                android:textColor="@android:color/black"
                android:text="middle" />    
        </LinearLayout>
    <LinearLayout android:id="@+id/titleLine"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/txtTitle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="16sp"
            android:textColor="@android:color/black"
            android:text="title" android:ellipsize="marquee"/>
    </LinearLayout>
</LinearLayout>

Answer 1

嗯，它更像是 arrayAdapter这是示例代码

public class ListViewFilter extends Activity {
private ItemDatabaseHelper itemData;
private SimpleCursorAdapter sc;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    itemData=new ItemDatabaseHelper(this);
    Cursor c=itemData.getAllValues(); 

    sc=new 
        SimpleCursorAdapter(this, R.layout.list_items, c, new String[]{itemData.VALUE}, new int[]{R.id.txtItem});
    ListView lv=(ListView)findViewById(R.id.lstItems);
    lv.setAdapter(sc);
    sc.setFilterQueryProvider(new FilterQueryProvider() {

        @Override
        public Cursor runQuery(CharSequence constraint) {
            String partialValue = constraint.toString();
            return itemData.getAllSuggestedValues(partialValue);

        }
    });
    EditText etext=(EditText)findViewById(R.id.etxtItemName);
    etext.addTextChangedListener(new TextWatcher() {

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


        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {


        }

        @Override
        public void afterTextChanged(Editable s) {
            sc.getFilter().filter(s.toString());

        }
    });
}

下面列出了两个xml文件

main.xml是

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<EditText  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/etxtItemName"
    android:layout_alignParentTop="true"
    />
<ListView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/lstItems"
    android:layout_below="@+id/etxtItemName"
    />
</RelativeLayout>

list_item.xml 是

  <?xml version="1.0" encoding="utf-8"?>
<TextView
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/txtItem"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
</TextView>

希望对你有帮助