内存不足Android错误

Question

以下是我的片段的基本功能：1。在onCreate方法中从名为Backendless.com的后端服务（名称和电话号码）中检索数据。 2.将数据存储在本地SQlite数据库中，然后用于填充ListView。用户在片段中执行他们想要的操作（添加新联系人，删除旧联系人等）3。一旦用户退出片段，就将操作数据从SQlite数据库保存回后端服务。这发生在onPause方法中。一切正常，直到达到onPause（）方法然后我得到java.lang.OutOfMemory错误

这是我的SQlite数据管理器类，它在本地存储名称和电话号码。

public class DBAdapter {
private final static String TAG = "DBAdapter";

//Field Names
public final static String KEY_ROWID = "_id";
public final static String KEY_NAME = "name";
public final static String KEY_NUMBER = "number";

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


//Database Info
public static final String DATABASE_NAME = "ContactsDatabase";
public static final String DATABASE_TABLE = "Contacts";
public static final int DATABASE_VERSION = 1;

//SQL to create database
private static final String DATABASE_CREATE_SQL =
        "CREATE TABLE " + DATABASE_TABLE
                + " (" + KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
                + KEY_NAME + " TEXT, "
                + KEY_NUMBER + " TEXT"
                +");";

private final Context context;
private DatabaseHelper myDBHelper;
private SQLiteDatabase db;

public DBAdapter(Context c){
    this.context = c;
    myDBHelper = new DatabaseHelper(context);
}

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

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

public long insertRow(String name,String number){
    ContentValues values = new ContentValues();
    values.put(KEY_NAME, name);
    values.put(KEY_NUMBER, number);
    return db.insert(DATABASE_TABLE,null,values);
}

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());
    }
}

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

// Get a Specific row by rowID
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;
}

//Change an existing row with new Data
public boolean updateRow(long rowID, String name, String num){
    String where = KEY_ROWID + "=" +rowID;
    ContentValues values = new ContentValues();
    values.put(KEY_NAME,name);
    values.put(KEY_NUMBER,num);
    return db.update(DATABASE_TABLE,values,where,null)!=0;
}

private static class DatabaseHelper extends SQLiteOpenHelper {

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

    @Override
    public void onCreate(SQLiteDatabase db) {

        db.execSQL(DATABASE_CREATE_SQL);
        Log.v("Adapter", "UPDATED");
    }

    @Override
    public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
        db.execSQL(DATABASE_CREATE_SQL);
        Log.v("Adapter", "DOWNGRADED");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
        onCreate(db);
    }
}}

这里是我的碎片代码。当我尝试在onPause（）方法上从本地数据库中检索数据时，应用程序一直崩溃：

public class ContactsFragments extends Fragment {
public DBAdapter myDB;
EditText inputName,inputNumber;
private View view;
private Button saveButton, deleteAllButton;
public ListView myList;
public long rowClickedForEdit = -1;
public boolean shouldWeEdit = false;
private ArrayList<String> numbersForWeb = new ArrayList<>();
private ArrayList<String> namesForWeb = new ArrayList<>();

public ContactsFragments() {setRetainInstance(true);}

@Override
public void onCreate(Bundle savedInstanceState) {
    final String userEmail = Backendless.UserService.CurrentUser().getEmail();
    Toast.makeText(getActivity(), "UE: " + userEmail, Toast.LENGTH_LONG).show();
    retrieveDataFromCloud(userEmail);
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    view =  inflater.inflate(R.layout.fragment_contacts_fragments, container, false);

    inputName = (EditText)view.findViewById(R.id.inputName);
    inputNumber = (EditText)view.findViewById(R.id.inputNumber);
    saveButton = (Button)view.findViewById(R.id.saveButton);
    deleteAllButton = (Button)view.findViewById(R.id.deleteAllButton);
    openDB();
    populateListView();
    listViewItemCancel();

    saveButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (shouldWeEdit) {
                myDB.updateRow(rowClickedForEdit,
                        inputName.getText().toString(),
                        inputNumber.getText().toString()
                );
                populateListView();
            } else {
                onClick_Add(v);
            }

            shouldWeEdit = false;
            inputName.setText("");
            inputNumber.setText("");
            inputName.setHint("ENTER CONTACT NAME");
            inputNumber.setHint("ENTER CONTACT NUMBER");
            final InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(getView().getWindowToken(), 0);
        }
    });

    deleteAllButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            onClickDeleteAll(v);
            shouldWeEdit = false;
            inputName.setText("");
            inputNumber.setText("");
            inputName.setHint("ENTER CONTACT NAME");
            inputNumber.setHint("ENTER CONTACT NUMBER");
        }
    });

    myList = (ListView)view.findViewById(R.id.listViewFragment);

    return view;
}

private void openDB(){
    myDB = new DBAdapter(getActivity());
    myDB.open();
}

public void onClick_Add(View v){
    if (!TextUtils.isEmpty(inputName.getText().toString())){
        myDB.insertRow(inputName.getText().toString(), inputNumber.getText().toString());
    }else{
        Toast.makeText(getActivity(), "Please Enter A Name", Toast.LENGTH_LONG).show();
    }
    populateListView();
}

public void populateListView(){
    Cursor cursor = myDB.getAllRows();


    String[] fromFieldNames = new String[] {DBAdapter.KEY_NAME,DBAdapter.KEY_NUMBER};
    int[] toViewIDs = new int[] {R.id.customRowContactName,R.id.customRowContactNumber};

    CursorAdapter cursorAdapter;
    cursorAdapter = new CursorAdapter(getActivity(),R.layout.contacts_custom_row,cursor,fromFieldNames,toViewIDs);

    myList = (ListView)view.findViewById(R.id.listViewFragment);
    myList.setAdapter(cursorAdapter);
}

public void onClickDeleteAll(View v){
    myDB.deleteAll();
    populateListView();
}


private void listViewItemCancel(){
    myList = (ListView) view.findViewById(R.id.listViewFragment);
    myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            inputName.setText("");
            inputNumber.setText("");
            inputName.setHint("ENTER CONTACT NAME");
            inputNumber.setHint("ENTER CONTACT NUMBER");
            shouldWeEdit = false;
            populateListView();
        }
    });
}

class CursorAdapter extends SimpleCursorAdapter {
    private Cursor c;
    private Context context;

    public CursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
        super(context, layout, c, from, to);
        this.c = c;
        this.context = context;
    }

    @Override
    public View getView(int pos, View inView, ViewGroup parent) {
        View vix = inView;

        if (vix == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            vix = inflater.inflate(R.layout.contacts_custom_row, null);
        }
        this.c.moveToPosition(pos);

        String name = this.c.getString(this.c.getColumnIndex(DBAdapter.KEY_NAME));
        String num = this.c.getString(this.c.getColumnIndex(DBAdapter.KEY_NUMBER));
        final String id = this.c.getString(this.c.getColumnIndex(DBAdapter.KEY_ROWID));

        TextView textName = (TextView) vix.findViewById(R.id.customRowContactName);
        textName.setText(name);
        final TextView textNum = (TextView) vix.findViewById(R.id.customRowContactNumber);
        textNum.setText(num);
        final TextView textCancel = (TextView)vix.findViewById(R.id.customRowCancelText);
        textCancel.setVisibility(View.INVISIBLE);

        final TextView deleteText = (TextView)vix.findViewById(R.id.customRowDeleteText);
        final TextView editInfo = (TextView)vix.findViewById(R.id.customRowEditText);

        deleteText.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myDB.deleteRow(Integer.valueOf(id));
                populateListView();
            }
        });

        editInfo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                textCancel.setVisibility(View.VISIBLE);
                inputName.setText("");
                inputNumber.setText("");
                inputName.setHint("ENTER NEW NAME");
                inputNumber.setHint("ENTER NEW NUMBER");
                rowClickedForEdit = Long.valueOf(id);
                shouldWeEdit = true;
            }
        });

        textNum.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                URI uri;
                Intent intent = new Intent(Intent.ACTION_DIAL);
                intent.setData(Uri.parse("tel:" + textNum.getText().toString()));
                startActivity(intent);
            }
        });

        return vix;
    }
}

public void retrieveDataFromCloud(String userEmail){

    String whereClause = "userEmailID = '"+ userEmail +"'";
    BackendlessDataQuery dataQuery = new BackendlessDataQuery();
    dataQuery.setWhereClause( whereClause );

    Backendless.Persistence.of(LocalPhoneNum.class).find(dataQuery, new AsyncCallback<BackendlessCollection<LocalPhoneNum>>(){
        @Override
        public void handleResponse( BackendlessCollection<LocalPhoneNum> foundContacts )
        {
            List<String> dataArrayList = new ArrayList<String>();
            for (LocalPhoneNum temp : foundContacts.getData()){
               dataArrayList.add(temp.getPhoneNum());
            }
            if (dataArrayList.isEmpty()){
                Toast.makeText(getActivity(), "No Data Found", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(getActivity(), dataArrayList.get(0), Toast.LENGTH_LONG).show();
            }

        }
        @Override
        public void handleFault( BackendlessFault fault )
        {
            Toast.makeText(getActivity(), "Error" , Toast.LENGTH_SHORT).show();
        }
    });
}

@Override
public void onPause() {
    ** ERROR OCCURS HERE
    Cursor cursor = myDB.getAllRows();
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        String data = cursor.getString(cursor.getColumnIndex("name"));
        namesForWeb.add(data);
    }



    String userEmail = Backendless.UserService.CurrentUser().getEmail();
    LocalPhoneNum localPhoneNum = new LocalPhoneNum(userEmail, "617 8", "mark");

    super.onPause();
    Backendless.Persistence.save(localPhoneNum, new AsyncCallback<LocalPhoneNum>() {

        @Override
        public void handleResponse(LocalPhoneNum localPhoneNum) {
            Toast.makeText(getActivity().getApplicationContext(), "Saved To Cloud", Toast.LENGTH_LONG).show();
        }

        @Override
        public void handleFault(BackendlessFault backendlessFault) {
            Toast.makeText(getActivity().getApplicationContext(), "Not Saved To Cloud " + backendlessFault, Toast.LENGTH_LONG).show();
        }
    });
}}

有谁知道我为什么会收到此错误？应用程序只是做得太多了吗？谢谢！