SQLiteDatabase zeigt keine Informationen an ImageButton Crashs App

Question

Ich erstelle eine Kalorien-App für mein Klassenprojekt. Ich versuchte, eine Datenbank zu implementieren, um die Information der Kalorien zu speichern, die vom Benutzer hinzugefügt wurden, die in einer Listview angezeigt würden. Der Benutzer gibt die Kalorien in das add_entry-Fragment ein und wird auf der fragment_home-Seite in der Listenansicht angezeigt.

Problem: Ich bin mir nicht sicher, ob ich die Informationen mit dem Eintrag Fragment hinzufügen richtig zur Datenbank hinzufüge, um die Informationen in der Listenansicht anzuzeigen. Ich arbeite zum ersten Mal mit Android Studio/App.

Problem 2: Aus irgendeinem Grund, wenn ich auf Image stürzt auf meine homefragment App klicken und es dem add_entry Fragment

logcat gehen tut:

  04-06 00:33:41.213 30567-30567/com.example.treycoco.calorietracker E/AndroidRuntime: FATAL EXCEPTION: main 
                       Process: com.example.treycoco.calorietracker, PID: 30567 
                       java.lang.IllegalStateException: Could not find method Click(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatImageButton with id 'AddItems' 
                        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:325) 
                        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284) 
                        at android.view.View.performClick(View.java:5697) 
                        at android.view.View$PerformClick.run(View.java:22526) 
                        at android.os.Handler.handleCallback(Handler.java:739) 
                        at android.os.Handler.dispatchMessage(Handler.java:95) 
                        at android.os.Looper.loop(Looper.java:158) 
                        at android.app.ActivityThread.main(ActivityThread.java:7229) 
                        at java.lang.reflect.Method.invoke(Native Method) 
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

FragmentHome.java

    public class FragmentHome extends Fragment implements 
     View.OnClickListener { 

     public static final String ARG_SECTION_NUMBER = "section_number"; 
     public static final String ARG_ID = "_id"; 
     private TextView label; 
     private int sectionNumber = 0; 
     private Calendar fragmentDate; 
     ListView listview; 
     ImageButton AddEntrybtn; 
      CalorieDatabase calorieDB; 

      private android.support.v4.app.FragmentManager fragmentManager; 
     private FragmentTransaction fragmentTransaction; 

      public FragmentHome() { 
      // Required empty public constructor 
      } 
     @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

     View myView = inflater.inflate(R.layout.fragment_home, container, 
     false); 
     label= (TextView) myView.findViewById(R.id.section_label); 
     AddEntrybtn = (ImageButton) myView.findViewById(R.id.AddItems); 
      return myView; 
      } 

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

      Bundle username = getActivity().getIntent().getExtras(); 



      String username1 = username.getString("Username"); 

      TextView userMain= (TextView) getView().findViewById(R.id.User); 

     userMain.setText(username1); 

     openDataBase(); 

    } 



      private void openDataBase(){ 


     calorieDB= new CalorieDatabase(getActivity()); 
     calorieDB.open(); 


    } 

    private void closeDataBase(){ 
     calorieDB.close(); 
     }; 


     private void populateLVFromDB(){ 

    Cursor cursor = calorieDB.getAllRows(); 




    String[] fromFieldNames = new String[] 
      {CalorieDatabase.KEY_NAME, CalorieDatabase.KEY_CalorieValue}; 
    int[] toViewIDs = new int[] 
      {R.id.foodEditText,  R.id.caloriesEditText,   }; 


        SimpleCursorAdapter myCursorAdapter = 
        new SimpleCursorAdapter(
         getActivity(),   
        R.layout.row_item, 
         cursor,     
         fromFieldNames,   
         toViewIDs     
        ); 


     listview = (ListView) getActivity().findViewById(R.id.listView); 
      listview.setAdapter(myCursorAdapter); 


      } 


       @Override 
      public void onResume() { 
      super.onResume(); 
     // set label to selected date. Get date from Bundle. 
    int dayOffset = sectionNumber - FragmentHomeDayViewPager.pagerPageToday; 
    fragmentDate = Calendar.getInstance(); 
    fragmentDate.add(Calendar.DATE, dayOffset); 
    SimpleDateFormat sdf = new SimpleDateFormat(appMain.dateFormat); 

      String labelText = sdf.format(fragmentDate.getTime()); 
      switch (dayOffset) { 
       case 0: 
      labelText += " (Today)"; 
       break; 
       case 1: 
       labelText += " (Tomorrow)"; 
        break; 
       case -1: 
       labelText += " (Yesterday)"; 
       break; 
       } 
      label.setText(labelText); 

    } 



      @Override 
      public void onDestroy() { 
       super.onDestroy(); 

      } 


       @Override 
      public void onDetach() { 
       super.onDetach(); 

     startActivity(new Intent(getContext(),MainActivity.class)); 
      } 


     @Override 
      public void onClick(View v) { 
       switch (v.getId()) { 
        case R.id.AddItems: 

      AddEntry addEntry = new AddEntry(); 

      fragmentTransaction = fragmentManager.beginTransaction(); 
      fragmentTransaction.addToBackStack(null); 
      fragmentTransaction.replace(R.id.FragmentHolder,addEntry) 

        .commit(); 


      break; 
      } 


     } 
     } 

KalorienDatenbank.java

    public class CalorieDatabase { 

      private static final String TAG = "DBAdapter"; 


     public static final String KEY_ROWID = "_id"; 
      public static final int COL_ROWID = 0; 


     public static final String KEY_NAME = "Description"; 

     public static final String KEY_CalorieValue = "Calories"; 


      public static final int COL_NAME = 1; 
       public static final int COL_CalorieValue= 2; 



     public static final String[] ALL_KEYS = new String[] {KEY_ROWID, 
      KEY_NAME, KEY_CalorieValue}; 

     public static final String DATABASE_NAME = "CalorieDb"; 
     public static final String DATABASE_TABLE = "Calorie_Info"; 

      public static final int DATABASE_VERSION = 1; 

      private static final String DATABASE_CREATE_SQL = 
       "create table " + DATABASE_TABLE 
       + " (" + KEY_ROWID + " integer primary key autoincrement, " 


       + KEY_NAME + " text not null, " 
       + KEY_CalorieValue + " integer not null, " 


       + ");"; 


     private final Context context; 

     private DatabaseHelper myDBHelper; 
      private SQLiteDatabase db; 



      public CalorieDatabase(Context ctx) { 
       this.context = ctx; 
       myDBHelper = new DatabaseHelper(context); 
       } 

      public CalorieDatabase open() { 
       db = myDBHelper.getWritableDatabase(); 
       return this; 
       } 


      public void close() { 
       myDBHelper.close(); 
      } 


     public long insertRow(String description, int CalorieVal) { 


      ContentValues initialValues = new ContentValues(); 
      initialValues.put(KEY_NAME, description); 
      initialValues.put(KEY_CalorieValue, CalorieVal); 


      return db.insert(DATABASE_TABLE, null, initialValues); 
      } 


      public boolean deleteRow(long rowId) { 
       String where = KEY_ROWID + "=" + rowId; 
       return db.delete(DATABASE_TABLE, where, null) != 0; 
        } 

        public void deleteAll() { 
       Cursor c = getAllRows(); 
       long rowId = c.getColumnIndexOrThrow(KEY_ROWID); 
       if (c.moveToFirst()) { 
        do { 
        deleteRow(c.getLong((int) rowId)); 
        } while (c.moveToNext()); 
      } 
       c.close(); 
       } 


       public Cursor getAllRows() { 
       String where = null; 
       Cursor c =  db.query(true, DATABASE_TABLE, ALL_KEYS, 
      where, null, null, null, null, null); 
       if (c != null) { 
        c.moveToFirst(); 
       } 
        return c; 
          } 


       public Cursor getRow(long rowId) { 
      String where = KEY_ROWID + "=" + rowId; 
       Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, 
       where, null, null, null, null, null); 
       if (c != null) { 
        c.moveToFirst(); 
        } 
        return c; 
        } 


       public boolean updateRow(long rowId, String description, int 
      CalorieValue) { 
       String where = KEY_ROWID + "=" + rowId; 


      ContentValues newValues = new ContentValues(); 
      newValues.put(KEY_NAME, description); 
       newValues.put(KEY_CalorieValue, CalorieValue); 



     return db.update(DATABASE_TABLE, newValues, where, null) != 0; 
        } 

      private static class DatabaseHelper extends SQLiteOpenHelper 
      { 
        DatabaseHelper(Context context) { 
        super(context, DATABASE_NAME, null, DATABASE_VERSION); 
        } 

          @Override 
        public void onCreate(SQLiteDatabase _db) { 
        _db.execSQL(DATABASE_CREATE_SQL); 
         } 

         @Override 
      public void onUpgrade(SQLiteDatabase _db, int oldVersion, int 
        newVersion) { 
       Log.w(TAG, "Upgrading application's database from version " + 
      oldVersion 
       + " to " + newVersion + ", which will destroy all old 
       data!"); 


        _db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE); 


         onCreate(_db); 
        } 
       } 
     } 

AddEntry.java

     public class AddEntry extends Fragment implements 
        View.OnClickListener { 

       EditText DescriptionET,CalorieET; 


       ImageButton savebtn; 

      String description , calorieAmt; 
      CalorieDatabase calorieDB; 
      public AddEntry() { 
      // Required empty public constructor 
      } 





       @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
       // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.fragment_add_entry, container, false); 
       } 


      @Override 
     public void onViewCreated(View view, Bundle savedInstanceState) { 
     super.onViewCreated(view, savedInstanceState); 

     DescriptionET= (EditText)view.findViewById(R.id.foodEditText); 
     CalorieET=(EditText)view.findViewById(R.id.caloriesEditText); 



      } 

       @Override 
       public void onClick(View v) { 
        switch (v.getId()) { 


         case R.id.SaveBtn: 

         description = DescriptionET.getText().toString(); 
         calorieAmt=CalorieET.getText().toString(); 





         break; 


        case R.id.CancelBtn: 


          break; 
         } 
         } 



       @Override 
      public void onDestroy() { 
       super.onDestroy(); 

      } 

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

        } 

Answer 1

private statische finale Zeichenfolge DATABASE_NAME = "CalorieDb.db";

Und dann unter Methode in oncreat nennen()

public void checkDB() { 
    try { 

     //android default database location is : /data/data/youapppackagename/databases/ 
     String packageName = this.getPackageName(); 
     String destPath = "/data/data/" + packageName + "/databases"; 
     String fullPath = "/data/data/" + packageName + "/databases/" 
       + DATABASE_NAME; 

     //this database folder location 
     File f = new File(destPath); 

     //this database file location 
     File obj = new File(fullPath); 

     //check if databases folder exists or not. if not create it 
     if (!f.exists()) { 
      f.mkdirs(); 
      f.createNewFile(); 
     } 

     //check database file exists or not, if not copy database from assets 
     if (!obj.exists()) { 
      this.CopyDB(fullPath); 
     } 

    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 

    } catch (IOException e) { 
     e.printStackTrace(); 

    } 
} 

Unintall App und sauber und neu erstellen Projekt dann denke ich, Ihr Problem lösen.

Answer 2

Versuchen Sie, diese replaceing, Entfernen der letzten Komma (,) aus der Erklärung

private static final String DATABASE_CREATE_SQL = 
       "create table " + DATABASE_TABLE 
       + " (" + KEY_ROWID + " integer primary key autoincrement, " 
       + KEY_NAME + " text not null, " 
       + KEY_CalorieValue + " integer not null " 
       + ");"; 

Answer 3

entfernen , aus dem letzten Feld

private static final String DATABASE_CREATE_SQL = 
       "create table " + DATABASE_TABLE 
       + " (" + KEY_ROWID + " integer primary key autoincrement, " 
       + KEY_NAME + " text not null, " 
       + KEY_CalorieValue + " integer not null " 
       + ");"; 

Answer 4

private static final String DATABASE_CREATE_SQL = 
      " create table " + DATABASE_TABLE 
      + " (" + KEY_ROWID + " integer primary key autoincrement, " 
      + KEY_NAME + " text not null, " 
      + KEY_CalorieValue + " integer not null, " 
      + "); "; 

Speicherplatz hinzufügen ")"