android – 排序顺序不适用于listView和游标加载器

Android 前端之家
前端之家收集整理的这篇文章主要介绍了android – 排序顺序不适用于listView和游标加载器，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
我有一个listView,它由游标加载器中的游标填充,并使用内容提供程序.我想对listView进行排序,以便安排它例如最新的项目添加在listView的顶部. listView始终以相同的顺序出现,我无法更改此顺序.

我尝试使用排序顺序并更改它,无论它设置为什么,listView始终显示相同位置的项目.使用这样的排序顺序,

CursorLoader loader = new CursorLoader
  (List.this,Database.CONTENT_URI,projection,null,LocationsTable.TIME_STAMP + " ASC");

我试图按TIME_STAMP之外的其他列进行排序,但结果始终相同.列表中项目的顺序永远不会改变.甚至将ASC更改为DESC也没有效果.

如何设置使用cursorAdapter填充的listView中显示的项目的顺序或位置？

listview类中的一些代码示例

来自onCreate方法

adapter = new ViewAdapter(this,0);

// sets array adapter to listview
listViewOne.setAdapter(adapter);

getLoaderManager().initLoader(LOADER_ID_ONE,this);

LoaderCallbacks的三个回调方法< Cursor>

@Override
public Loader<Cursor> onCreateLoader(int id,Bundle args) {
        String projection[] = new String[]{LocationsTable._ID,LocationsTable.LATITUDE,LocationsTable.LONGITUDE,LocationsTable.LAND_ADDRESS,LocationsTable.LAST_NAME,LocationsTable.FIRST_NAME,LocationsTable.LOCATION_IMAGE,LocationsTable.TIME_STAMP };

     CursorLoader loader = new CursorLoader
    (List.this,LocationsTable.TIME_STAMP + " ASC");
    return loader;
} // onCreateLoader

@Override
public void onLoadFinished(Loader<Cursor> loader,Cursor cursor) {
    adapter.swapCursor(cursor);
} // onLoadFinished

@Override
public void onLoaderReset(Loader<Cursor> arg0) {
     adapter.swapCursor(null);
} // onLoaderReset

这是用于在数据库中创建表的字符串扩展ContentProvider

private static final String sql_QUERY_CREATE = "CREATE TABLE "
+ LocationsTable.TABLE_NAME + " (" + LocationsTable._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + LocationsTable.LATITUDE + " TEXT NOT NULL,"
+ LocationsTable.LONGITUDE + " TEXT NOT NULL," + LocationsTable.LAND_ADDRESS + " TEXT," + LocationsTable.LAST_NAME + " TEXT," 
+ LocationsTable.FIRST_NAME + " TEXT," + LocationsTable.LAST_NAME_ALT + " TEXT,"  + LocationsTable.FIRST_NAME_ALT + " TEXT," 
+ LocationsTable.CONTACT_ADDRESS + " TEXT," + LocationsTable.PHONE_NUMBER + " TEXT,"  + LocationsTable.MOBILE_NUMBER + " TEXT,"
+ LocationsTable.EMAIL + " TEXT," + LocationsTable.LOCATION_IMAGE + " TEXT," + LocationsTable.TIME_STAMP_IMAGE + " INTEGER," 
+ LocationsTable.TIME_STAMP + " INTEGER " + ");";

游标适配器类

public class ViewAdapter extends CursorAdapter {

LayoutInflater inflater;
    LatandLngString latandLng;

public ViewAdapter(Context context,Cursor cursor,int b) {
    super(context,cursor,b);

    inflater = LayoutInflater.from(context);
} // ViewAdapter constructor    

@Override
public void bindView(View view,final Context context,Cursor cursor) {

    TextView textViewOne = (TextView) view.findViewById(R.id.textView1); // address
    TextView textViewTwo = (TextView) view.findViewById(R.id.textView2); // last name 
    TextView textViewThree = (TextView) view.findViewById(R.id.textView3); // first name
    final Button buttonOne = (Button) view.findViewById(R.id.button1);
    final ImageView imageViewOne = (ImageView) view.findViewById(R.id.imageView1);
    final ImageView imageViewTwo = (ImageView) view.findViewById(R.id.imageView2);
    textViewOne.setText(cursor.getString(cursor.getColumnIndex(LocationsTable.LAND_ADDRESS)));
    textViewTwo.setText(cursor.getString(cursor.getColumnIndex(LocationsTable.LAST_NAME)));
    textViewThree.setText(cursor.getString(cursor.getColumnIndex(LocationsTable.FIRST_NAME)));
    String latitude = cursor.getString(cursor.getColumnIndex(LocationsTable.LATITUDE));
    String longitude = cursor.getString(cursor.getColumnIndex(LocationsTable.LONGITUDE));
    String imagePath = cursor.getString(cursor.getColumnIndex(LocationsTable.LOCATION_IMAGE));
    long timeStampImage = cursor.getLong(cursor.getColumnIndex(LocationsTable.TIME_STAMP));

    if(imagePath != null){

        int widthInDP = (int)     TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,80,getResources().getDisplayMetrics());
        int heightInDP = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,50,getResources().getDisplayMetrics());
        Bitmap sizedBitmap = ImageUtil.createReducedBitmap(imagePath,widthInDP,heightInDP);
        imageViewTwo.setImageBitmap(sizedBitmap);
    }

       textViewOne.setMaxLines(1);
       textViewTwo.setMaxLines(2);
       textViewThree.setMaxLines(3);

    final LatandLngString latandLng = new LatandLngString(latitude,longitude);

    buttonOne.setTag(latandLng);
    imageViewOne.setTag(latandLng);
    imageViewTwo.setTag(latandLng);

    // go to register page to edit fields
     buttonOne.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View view,MotionEvent event) {

                     if (event.getAction() == MotionEvent.ACTION_DOWN) {

                            ((Button) view).setAlpha(0.3f);

                            LatandLngString latandLngRow = (LatandLngString) buttonOne.getTag();

                            Intent intent = new Intent(List.this,Register.class);                                                      
                            intent.putExtra("latitude",String.valueOf(latandLngRow.latitude));
                            intent.putExtra("longitude",String.valueOf(latandLngRow.longitude));
                            intent.putExtra("origin",1);
                            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            List.this.startActivity(intent);

                            return true;
                        } else if (event.getAction() == MotionEvent.ACTION_UP) {

                            ((Button) view).setAlpha(1.0f);

                            return true;

                        }
                        return false;
           }                
      });           

    // go to map page to display map
     imageViewOne.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View view,MotionEvent event) {              

                     if (event.getAction() == MotionEvent.ACTION_DOWN) {

                            ((ImageView) view).setAlpha(0.3f);

LatandLngString latandLngRow = (LatandLngString) buttonOne.getTag();

                            Intent intent = new Intent(List.this,Map.class);
                            intent.putExtra("latitude",String.valueOf(latandLngRow.longitude));
                            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);                               
                            intent.putExtra("showMarker",true);

                            List.this.startActivity(intent);

                            return true;
                        } else if (event.getAction() == MotionEvent.ACTION_UP) {

                            ((ImageView) view).setAlpha(1.0f);

                            return true;

                        }
                        return false;
            } 
        });

    // set image for button
             imageViewTwo.setOnTouchListener(new OnTouchListener() {

                    @Override
                    public boolean onTouch(View view,MotionEvent event) {

                             if (event.getAction() == MotionEvent.ACTION_DOWN) {

                                    ((ImageView) view).setAlpha(0.3f);

                                    LatandLngString latandLngRow = (LatandLngString) view.getTag();

                                    Intent intent = new Intent(List.this,ImageSelector.class);                                                         
                                    intent.putExtra("latitude",String.valueOf(latandLngRow.latitude));
                                    intent.putExtra("longitude",String.valueOf(latandLngRow.longitude));
                                    List.this.startActivity(intent);

                                    return true;
                                } else if (event.getAction() == MotionEvent.ACTION_UP) {

                                    ((ImageView) view).setAlpha(1.0f);

                                    return true;

                                }
                                return false;
                   }                
              });       

}

@Override
public View newView(Context context,ViewGroup parent) {

    return inflater.inflate(R.layout.listview_row,parent,false);

}

}

CONTENT PROVIDER CLASS完整代码

// application package name

 // import statements

 public class Database extends ContentProvider {

private static final UriMatcher sUriMatcher;

private static final int LOCATIONS_ALL = 1;
private static final int LOCATIONS_ONE = 2;

public static final String AUTHORITY = "com.xxx.realestatelocator.Locations";
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/locations");

public static final String DATABASE_NAME = "locations.db";
public static final int DATABASE_VERSION = 1;

public static final String CONTENT_TYPE_NOTES_ALL = "vnd.android.cursor.dir/vnd.realestate.locations";
public static final String CONTENT_TYPE_NOTES_ONE = "vnd.android.cursor.item/vnd.realestate.locations";

static {
        sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        sUriMatcher.addURI(AUTHORITY,"locations",LOCATIONS_ALL);
        sUriMatcher.addURI(AUTHORITY,"locations/#",LOCATIONS_ONE);
       }

// Map table columns
    private static final HashMap<String,String> sNotesColumnProjectionMap;

    private DatabaseHelper mDbHelper;

    static {
        sNotesColumnProjectionMap = new HashMap<String,String>();
        sNotesColumnProjectionMap.put(LocationsTable._ID,LocationsTable._ID);
        sNotesColumnProjectionMap.put(LocationsTable.LATITUDE,LocationsTable.LATITUDE);
        sNotesColumnProjectionMap.put(LocationsTable.LONGITUDE,LocationsTable.LONGITUDE);
        sNotesColumnProjectionMap.put(LocationsTable.LAND_ADDRESS,LocationsTable.LAND_ADDRESS);
        sNotesColumnProjectionMap.put(LocationsTable.LAST_NAME,LocationsTable.LAST_NAME);
        sNotesColumnProjectionMap.put(LocationsTable.FIRST_NAME,LocationsTable.FIRST_NAME);
        sNotesColumnProjectionMap.put(LocationsTable.LAST_NAME_ALT,LocationsTable.LAST_NAME_ALT);
        sNotesColumnProjectionMap.put(LocationsTable.FIRST_NAME_ALT,LocationsTable.FIRST_NAME_ALT);
        sNotesColumnProjectionMap.put(LocationsTable.CONTACT_ADDRESS,LocationsTable.CONTACT_ADDRESS);
        sNotesColumnProjectionMap.put(LocationsTable.PHONE_NUMBER,LocationsTable.PHONE_NUMBER);
        sNotesColumnProjectionMap.put(LocationsTable.MOBILE_NUMBER,LocationsTable.MOBILE_NUMBER);
        sNotesColumnProjectionMap.put(LocationsTable.EMAIL,LocationsTable.EMAIL);
        sNotesColumnProjectionMap.put(LocationsTable.LOCATION_IMAGE,LocationsTable.LOCATION_IMAGE);
        sNotesColumnProjectionMap.put(LocationsTable.TIME_STAMP_IMAGE,LocationsTable.TIME_STAMP_IMAGE);
        sNotesColumnProjectionMap.put(LocationsTable.TIME_STAMP,LocationsTable.TIME_STAMP);

        } 

 public class LocationsTable implements BaseColumns {

public static final String TABLE_NAME = "tbl_locations";
public static final String _ID = "_id";
public static final String LATITUDE = "latitude";
public static final String LONGITUDE = "longitude";
public static final String LAND_ADDRESS = "land_address";
public static final String LAST_NAME = "last_name";
public static final String FIRST_NAME = "first_name";
public static final String LAST_NAME_ALT = "last_name_alt";
    public static final String FIRST_NAME_ALT = "first_name_alt";
public static final String CONTACT_ADDRESS = "contact_address";
public static final String PHONE_NUMBER = "phone_number";
public static final String MOBILE_NUMBER = "mobile_number";
public static final String EMAIL = "email_address";
public static final String LOCATION_IMAGE = "location_image";
public static final String TIME_STAMP_IMAGE = "time_stamp_image";
public static final String TIME_STAMP = "time_stamp";

} // LocationsTable inner class

private static class DatabaseHelper extends sqliteOpenHelper {

public DatabaseHelper(Context context) {
    super(context,DATABASE_NAME,DATABASE_VERSION);
}

private static final String sql_QUERY_CREATE = "CREATE TABLE "
+ LocationsTable.TABLE_NAME + " (" + LocationsTable._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," 
+ LocationsTable.TIME_STAMP + " INTEGER " + ");";

private static final String sql_QUERY_DROP = "DROP TABLE IF EXISTS " + LocationsTable.TABLE_NAME + ";";

@Override
public void onCreate(sqliteDatabase db) {
     db.execsql(sql_QUERY_CREATE);
} // onCreate

@Override
public void onUpgrade(sqliteDatabase db,int oldVer,int newVer) {
    db.execsql(sql_QUERY_DROP);
    onCreate(db);
} // onUpgrade

} // DatabaseHelper inner class

@Override
public boolean onCreate() {
   if(mDbHelper == null) {
   mDbHelper = new DatabaseHelper(getContext());
   }
   return false;
}

@Override
   public String getType(Uri arg0) {
   return null;
} // getType

// insert one new row,full row
@Override
public Uri insert(Uri uri,ContentValues values) {
    if (sUriMatcher.match(uri) != LOCATIONS_ALL) {
       throw new IllegalArgumentException(" Unknown URI: " + uri);
}

sqliteDatabase db = mDbHelper.getWritableDatabase();
long rowId = db.insert(LocationsTable.TABLE_NAME,values);
if (rowId > 0) {
    Uri notesUri = ContentUris.withAppendedId(CONTENT_URI,rowId);
    getContext().getContentResolver().notifyChange(notesUri,null);
    return notesUri;
}
throw new IllegalArgumentException("<Illegal>Unknown URI: " + uri);

} // insert

@Override
public Cursor query(Uri uri,String[] projection,String selection,String[] selectionArgs,String sortOrder) {
sqliteQueryBuilder builder = new sqliteQueryBuilder();
    switch (sUriMatcher.match(uri)) {
    case LOCATIONS_ALL:
        builder.setTables(LocationsTable.TABLE_NAME);
        builder.setProjectionMap(sNotesColumnProjectionMap);
        break;

    case LOCATIONS_ONE:
        builder.setTables(LocationsTable.TABLE_NAME);
        builder.setProjectionMap(sNotesColumnProjectionMap);
        builder.appendWhere(LocationsTable._ID + " = " + uri.getLastPathSegment());
        break;

    default:
        throw new IllegalArgumentException("Unknown URI: " + uri);
}

sqliteDatabase db = mDbHelper.getReadableDatabase();
    Cursor queryCursor = builder.query(db,selection,selectionArgs,null);
    queryCursor.setNotificationUri(getContext().getContentResolver(),uri);

    return queryCursor;
} // query

@Override
    public int update(Uri uri,ContentValues values,String where,String[] whereArgs) {
    sqliteDatabase db = mDbHelper.getWritableDatabase();
    int count = 0;
    switch (sUriMatcher.match(uri)) {
    case LOCATIONS_ALL:
        count = db.update(LocationsTable.TABLE_NAME,values,where,whereArgs);
        break;

    case LOCATIONS_ONE:
        String rowId = uri.getLastPathSegment();
        count = db.update(LocationsTable.TABLE_NAME,LocationsTable._ID 
                + " = " + rowId + (!TextUtils.isEmpty(where) ? " AND (" + ")" : ""),whereArgs);

    default:
        throw new IllegalArgumentException("Unknown URI: " + uri);
    }

    getContext().getContentResolver().notifyChange(uri,null);
    return count;
} // update

// delete
@Override
public int delete(Uri uri,String[] whereArgs) {
    sqliteDatabase db = mDbHelper.getWritableDatabase();
    int count = 0;
    switch (sUriMatcher.match(uri)) {
    case LOCATIONS_ALL:
        count = db.delete(LocationsTable.TABLE_NAME,whereArgs);
        break;

    case LOCATIONS_ONE: 
        String rowId = uri.getPathSegments().get(1);
        count = db.delete(LocationsTable.TABLE_NAME,LocationsTable._ID + " = "
        + rowId + (!TextUtils.isEmpty(where) ? " AND (" + where + ")" : ""),whereArgs);
        break;

    default:
        throw new IllegalArgumentException("Unknown URI: " + uri);
    }

    getContext().getContentResolver().notifyChange(uri,null);
    return count;
} // delete

} // Database

解决方法

您似乎没有向数据库连接实例本身提供排序顺序参数,因此结果不会被排序.确保将ContentProvider#query方法中的所有参数委派给sqliteDatabase.

因此,您的sqliteQueryBuilder #build方法应该如下所示：

Cursor queryCursor = builder.query(db,sortOrder);
原文链接：https://www.f2er.com/android/309222.html

猜你在找的Android相关文章

directBootAware 和 defaultToDeviceProtectedStorage
以下为个人理解，如错请评 CE: 凭据加密 (CE) 存储空间, 实际路径/data/user_ce/ DE: 设备...
[Android] EventLogTags.logtags简单使用
转载来源：https://blog.csdn.net/yfbdxz/article/details/114702144 用EventLog.writeEve...
Android事件分发机制详解
事件分发机制详解 一、基础知识介绍 1、经常用的事件有：MotionEvent.ACTION_DOWN，Motion...
Android性能优化——之防止内存泄露
又是好久没有写博客了，一直都比较忙，最近终于有时间沉淀和整理一下最近学到和解决的一些...
Android 性能优化——之控件的优化
Android性能优化——之控件的优化 前面讲了图像的优化，接下来分享一下控件的性能优化，这...
安卓Native和H5页面进行交互
安卓Native和H5页面进行交互 1、H5页面调用安卓Native界面 1）通过给webView添加JsInterfa...
Android 性能优化——之图片的优化
Android性能优化——之图片的优化在Android性能优化中，我们会发现占内存最大的和对性能影...
AndroidStudio 各种异常情况处理大法
最近使用AndroidStudio出现了.java文件，显示为xml文件等问题，通过各种采坑之后，发现删除...
FragmentContainerView、ViewPager、ViewPager2与 BottomNaviagtionView结合使用的区别
FragmentContainerView、ViewPager、ViewPager2与 BottomNaviagtionView结合使用的区别
[android]android下apk的安装过程
/********************2016年4月23日更新********************************/ 知乎：有什么...
iOSAndroidSwiftHybridCocos2d-xFlutterXcodeSilverlightcocoaCordova
调试桥筛选栏假异步不会丢失AndPermissio权限申请抽屉式systemUI信号栏多行排列跨多行显示viewmode数据共享录制语音视频通话多行显示Studio3.5拉伸控件望远镜发动态走势图点赞控件显示牌冷启动v3签名v2签名v1签名本地html外接键盘流式标签