nicht in der Lage, ausgewählte Artikel aus Spinner Daten aus einer anderen Klasse geladen

Question

Ich habe zwei Klassen nämlich Produkt und Kategorie, In der Produktklasse habe ich einen Spinner, die Daten aus der Kategorie-Klasse lesen. ich will, dass, wenn eine Kategorie aus spinnern wählen, id aus dem Verfahren erhalten, das in categorydbAdapter ist, aber ich habe einen Fehler in dieser Zeile:

get_cat_id = categoryDBAdapter.backcatID(selectedItem); 

was das Problem s? Hier ist mein Code:

spinner = (Spinner) insert_product_dialog.findViewById(R.id.spinner_c); 

      categoryDBAdapter = new CategoryDBAdapter(getApplicationContext()); 


      ArrayList<Category> listcat = categoryDBAdapter.display_categories(); 

      ArrayAdapter<Category> adapter = 
        new ArrayAdapter<Category>(getApplicationContext(), R.layout.snipper_dropdown, listcat); 
      adapter.setDropDownViewResource(R.layout.snipper_dropdown); 

      spinner.setAdapter(adapter); 

      spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
       @Override 
       public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 

        String selectedItem = parent.getItemAtPosition(position).toString(); 

        get_cat_id = categoryDBAdapter.backcatID(selectedItem); 

        test.setText(get_cat_id); 

       } 

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

       } 
      }); 

und Verfahren in categorydbadapter:

public int backcatID(String CatName) { 

    int back_id; 
    String query = "select * from " + TBL_CAT+" where "+KEY_TITLE_cat+"="+CatName; 
    SQLiteDatabase database = this.getReadableDatabase(); 
    Cursor cursor = database.rawQuery(query, null); 
    if (cursor.moveToNext()) { 
     back_id = cursor.getInt(0); 
    } 
    else 
    { 
     back_id = 1000; 
    } 

    return back_id; 
} 

und Fehler:

11-16 12:19:51.259 3148-3148/com.myshop.navmenu E/AndroidRuntime: FATAL EXCEPTION: main 
                   Process: com.myshop.navmenu, PID: 3148 
                   android.database.sqlite.SQLiteException: no such column: phone (code 1): , while compiling: select * from tbl_category where title=phone 
                    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
                    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) 
                    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) 
                    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
                    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
                    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37) 
                    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44) 
                    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1318) 
                    at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1257) 
                    at com.myshop.navmenu.MyDatabase.CategoryDBAdapter.backcatID(CategoryDBAdapter.java:63) 
                    at com.myshop.navmenu.Activity.ProductManagerActivity$1$3.onItemSelected(ProductManagerActivity.java:134) 
                    at android.widget.AdapterView.fireOnSelected(AdapterView.java:931) 
                    at android.widget.AdapterView.dispatchOnItemSelected(AdapterView.java:920) 
                    at android.widget.AdapterView.-wrap1(AdapterView.java) 
                    at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:890) 
                    at android.os.Handler.handleCallback(Handler.java:751) 
                    at android.os.Handler.dispatchMessage(Handler.java:95) 
                    at android.os.Looper.loop(Looper.java:154) 
                    at android.app.ActivityThread.main(ActivityThread.java:6119) 
                    at java.lang.reflect.Method.invoke(Native Method) 
                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
    11-16 12:19:51.339 1590-1604/system_process W/ActivityManager: Force finishing activity com.myshop.navmenu/.Activity.ProductManagerActivity 
    11-16 12:19:51.563 2256-2911/com.google.android.gms W/PlatformStatsUtil: Could not retrieve Usage & Diagnostics setting. Giving up. 
    11-16 12:19:51.675 1293-1326/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x900 imply creation of host color buffer 

Answer 1

verwenden.

public int backcatID(String CatName) { 

     int back_id; 
     String query = "select * from " + TBL_CAT+" where " + KEY_TITLE_cat + "=\""+ CatName + "\""; 
     SQLiteDatabase database = this.getReadableDatabase(); 
     Cursor cursor = database.rawQuery(query, null); 
     if (cursor.moveToNext()) { 
      back_id = cursor.getInt(0); 
     } 
     else 
     { 
      back_id = 1000; 
     } 

     return back_id; 
    }