在android中插入数据库时SQLite类中的java.lang.NullPointerException

我正在尝试将数据库中的数据插入到

DecisionDatabase

类中。但是当涉及到行

ourDatabase.insert时（DB_TABLE，null，cv）
它抛出一个
NullPointerException
。它没有打开
DecisionDatabase
类日志显示：
无法打开数据库aysonudeccisiondb.sql
。我试图找到它为什么不打开数据库，但coludn找不到。
下面是应用程序的主要类别

public class Main extends FragmentActivity {

    EditText bakici, arabaKredisi, ogrenimKredisi, tatilKredisi, elektrik;
    EditText su, internet, aidat, kasko, digerTaksitler;
    EditText diger, maasSelo, maasHilal, digerGelirler;
    TextView toplamGelir, toplamHarcama, eldeKalan;
    Spinner yil, ay;
    LinearLayout row17, row18, row19;
    TemporaryDatabase tdb;
    AySonuDatabase aDb;
    DecisionDatabase dDb;
    MainFragment mainFragment = new MainFragment();
    FragmentTransaction transaction = getSupportFragmentManager()
            .beginTransaction();;
    private final String TAG = this.getClass().getSimpleName();
    int toplamgelir, toplamharcama = 0, eldekalan = 0;
    int bakicii, arabakredisi, ogrenimkredisi, tatilkredisi, elektrikk;
    int suu, internett, aidatt, kaskoo, digergelirler, maasselo, maashilal;
    int digertaksitler, digerr, yil2;
    String ay2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // Widget tanımlamaları
        toplamGelir = (TextView) findViewById(R.id.editTextToplamGelir);
        digerGelirler = (EditText) findViewById(R.id.editTextDigerGelirler);
        toplamHarcama = (TextView) findViewById(R.id.editTextToplamHarcama);
        diger = (EditText) findViewById(R.id.editTextDiger);
        digerTaksitler = (EditText) findViewById(R.id.editTextDigerTaksitler);
        kasko = (EditText) findViewById(R.id.editTextKaskoSigorta);
        aidat = (EditText) findViewById(R.id.editTextAidat);
        internet = (EditText) findViewById(R.id.editTextFaturaInternet);
        su = (EditText) findViewById(R.id.editTextFaturaSu);
        elektrik = (EditText) findViewById(R.id.editTextFaturaElektrik);
        tatilKredisi = (EditText) findViewById(R.id.editTextTatilKredisi);
        ogrenimKredisi = (EditText) findViewById(R.id.editTextOgrenimKredisi);
        arabaKredisi = (EditText) findViewById(R.id.editTextKrediAraba);
        bakici = (EditText) findViewById(R.id.editTextBakici);
        eldeKalan = (TextView) findViewById(R.id.editTextEldeKalan);
        maasSelo = (EditText) findViewById(R.id.editTextMaasSelo);
        maasHilal = (EditText) findViewById(R.id.editTextMaasHilal);
        yil = (Spinner) findViewById(R.id.spinnerYillar);
        ay = (Spinner) findViewById(R.id.spinnerAylar);
        row17 = (LinearLayout) findViewById(R.id.tableRow17);
        row18 = (LinearLayout) findViewById(R.id.tableRow18);
        row19 = (LinearLayout) findViewById(R.id.tableRow19);

        // Button etki tepkileri
        Button hesapla, getir, kaydet;
        hesapla = (Button) findViewById(R.id.buttonHesapla);
        getir = (Button) findViewById(R.id.buttonGetir);
        kaydet = (Button) findViewById(R.id.buttonKaydet);
        kaydet.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                kaydeden();

            }
        });
        hesapla.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                hesaplayan();

            }
        });
        getir.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                int yil2 = Integer.valueOf(yil.getSelectedItem().toString());
                String ay2 = ay.getSelectedItem().toString();
                tdb.Entry(yil2, ay2);
                row17.setVisibility(1);
                row18.setVisibility(1);
                row19.setVisibility(1);
                if (mainFragment != null)
                    transaction.remove(mainFragment);
                fragment();
            }
        });
        Log.i(TAG, "mainonCreate");
    }

    // Bütçe hesaplamalarını yapan yordam
    protected void hesaplayan() {
        bakicii = Integer.valueOf(bakici.getText().toString());
        arabakredisi = Integer.valueOf(arabaKredisi.getText().toString());
        ogrenimkredisi = Integer.valueOf(ogrenimKredisi.getText().toString());
        tatilkredisi = Integer.valueOf(tatilKredisi.getText().toString());
        elektrikk = Integer.valueOf(elektrik.getText().toString());
        suu = Integer.valueOf(su.getText().toString());
        internett = Integer.valueOf(internet.getText().toString());
        aidatt = Integer.valueOf(aidat.getText().toString());
        kaskoo = Integer.valueOf(kasko.getText().toString());
        digergelirler = Integer.valueOf(digerGelirler.getText().toString());
        maasselo = Integer.valueOf(maasSelo.getText().toString());
        maashilal = Integer.valueOf(maasHilal.getText().toString());
        digertaksitler = Integer.valueOf(digerTaksitler.getText().toString());
        digerr = Integer.valueOf(diger.getText().toString());

        toplamharcama = bakicii + arabakredisi + ogrenimkredisi + tatilkredisi
                + elektrikk + suu + internett + aidatt + kaskoo
                + digertaksitler + digerr;
        toplamHarcama.setText(String.valueOf(toplamharcama));

        toplamgelir = maashilal + maasselo + digergelirler;
        toplamGelir.setText(String.valueOf(toplamgelir));

        eldekalan = toplamgelir - toplamharcama;
        eldeKalan.setText(String.valueOf(eldekalan));

        row17.setVisibility(0);
        row18.setVisibility(0);
        row19.setVisibility(0);
        Log.i(TAG, "mainHesaplayan");
    }

    // Bütçe hesaplamalarını veritabanına kaydeden yordam.
    protected void kaydeden() {
        boolean didItWork = false;
        boolean isDataInDatabase = false;
        int i;
        try {

            yil2 = Integer.valueOf(yil.getSelectedItem().toString());
            ay2 = ay.getSelectedItem().toString();
            isDataInDatabase = aDb.Entry(yil2, ay2, bakicii, arabakredisi,
                    ogrenimkredisi, tatilkredisi, elektrikk, suu, internett,
                    aidatt, kaskoo, digertaksitler, digerr, maasselo,
                    maashilal, digergelirler, toplamharcama, toplamgelir,
                    eldekalan);
            if (isDataInDatabase) {
                FragmentManager fm = getSupportFragmentManager();
                MyDialogFragment testDialog = new MyDialogFragment();
                testDialog.setRetainInstance(true);
                testDialog.show(fm, "MyDialogFragment");

                i = dDb.getDecisionData();
                switch (i) {
                case 0:
                    aDb.EntryWithoutDialog(yil2, ay2, bakicii, arabakredisi,
                            ogrenimkredisi, tatilkredisi, elektrikk, suu,
                            internett, aidatt, kaskoo, digertaksitler, digerr,
                            maasselo, maashilal, digergelirler, toplamharcama,
                            toplamgelir, eldekalan);
                    didItWork = true;
                    break;
                default:
                    break;
                }
            } else
                didItWork = true;

        } catch (Exception e) {
            didItWork = false;
            Log.i("Log", e.getMessage() + "Error!");
        } finally {
            if (didItWork)
                Toast.makeText(Main.this, "DBEntrySucceed", Toast.LENGTH_LONG)
                        .show();
            else
                Toast.makeText(Main.this, "NoDBEntry", Toast.LENGTH_LONG)
                        .show();
            Log.i(TAG, "mainKaydeden");
        }
    }

    // Seçilen ay ve yılın bütçesini ekrana fragment yardımıyla yazdıran yordam.
    public void fragment() {
        try {

            transaction.add(R.id.mainLinLay, mainFragment);
            transaction.addToBackStack(null);
            transaction.commit();
            // Log
            Log.i(TAG, "mainfragment");
        } catch (Exception e) {
            // TODO: handle exception
            Log.i(TAG, "mainfragmentException");
        }
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

        aDb = new AySonuDatabase(Main.this);
        aDb.open();

        tdb = new TemporaryDatabase(Main.this);
        tdb.open();

        dDb = new DecisionDatabase(Main.this);
        dDb.open();
        Log.i(TAG, "mainonResume");
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();

        tdb.close();
        aDb.close();
        dDb.close();
        Log.i(TAG, "mainonPause");
    }

和片段类

public class MyDialogFragment extends DialogFragment{
    Context mContext=getActivity();
    boolean decision; 
    DecisionDatabase dDb=new DecisionDatabase(mContext);

    int i;
    private final String TAG =  this.getClass().getSimpleName();
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
        alertDialogBuilder.setTitle("Aynı tarihli kayit var!!!");
        alertDialogBuilder.setMessage("Kaydetmek istediğinizden emin misiniz?");
        dDb.open();

        //null should be your on click listener
        alertDialogBuilder.setPositiveButton("Evet", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                i=0;
                dDb.delete();
                dDb.EntryDecision(i);
                dDb.close();
                dialog.dismiss();

            }
        });
        alertDialogBuilder.setNegativeButton("Hayır", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                i=1;
                dDb.delete();
                dDb.EntryDecision(i);
                dDb.close();
                dialog.dismiss(); 
            }
        });

        Log.i(TAG, "MyDialogFragmentOnCreateDialog");
        return alertDialogBuilder.create();
    }
    @Override
    public void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        dDb.close();

        Log.i(TAG, "MyDialogFragmentOnStop");
    }
    @Override
    public void onStart() {
        // TODO Auto-generated method stub
        super.onStart();

        Log.i(TAG, "MyDialogFragmentOnStart");      
    }   
}

和决策数据库类

public class DecisionDatabase {

    public static final String TAG = DbHelperTemporary2.class.getSimpleName();
    public static final String DB_NAME = "aySonuDecisionDB.sql";
    private static int DB_PATH = R.string._data_data_com_bilge_aysonu_assets_;
    public static final int DB_VERSION = 1;
    public static final String DB_TABLE = "decision";

    public static final String C_ID = "_id";// Special for id
    public static final String C_DECISION = "dialogDecision";

    public static final String CREATE_TABLE = "CREATE TABLE decision (_id integer primary key autoincrement, "
            + "dialogDecision integer);";

    private DbHelperTemporary2 dbHelper;
    private final Context ourContext;
    private SQLiteDatabase ourDatabase;

    public static class DbHelperTemporary2 extends SQLiteOpenHelper {

        public DbHelperTemporary2(Context context) {

            super(context, DB_NAME, null, DB_VERSION);

        }

        @Override
        public void onCreate(SQLiteDatabase db) {

            Log.d(TAG, "onCreate sql: " + CREATE_TABLE);
            db.execSQL(CREATE_TABLE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

            db.execSQL("drop table if exists " + DB_TABLE);
            Log.w(TAG, "onUpdate drop table " + DB_TABLE);
            onCreate(db);
        }

    }

    public DecisionDatabase(Context c) {
        super();
        ourContext = c;
        Log.i(TAG, "DecisionDatabaseConstructor");
    }

    public void openDatabase() throws SQLException {
        ourDatabase = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null,
                SQLiteDatabase.OPEN_READWRITE);
    }

    public void open() throws NumberFormatException {

        try {
            dbHelper = new DbHelperTemporary2(ourContext);
            ourDatabase = dbHelper.getWritableDatabase();
            Log.i(TAG, "DecisionDatabaseOpen");
            return;
        } catch (Exception e) {
            Log.d(TAG, "Couldn't open database " + DB_NAME);
            e.printStackTrace();
        } finally {

        }
    }

    public void close() {

        dbHelper.close();
        ourDatabase.close();
    }
    public void delete (){
        if(ourDatabase!=null)
            ourDatabase.delete(DB_TABLE, null, null);
    }

    public void EntryDecision(int decision) {
        int decisionentry=decision;
        ContentValues cv = new ContentValues();
        cv.put(C_DECISION, decisionentry);
        ourDatabase.insert(DB_TABLE, null, cv);
        cv.clear();
        Log.i(TAG, "DecisionDatabaseEntryDecision");
    }

    public int getDecisionData() {
        Cursor c = ourDatabase.query(DB_TABLE, null, null, null, null, null,
                null);
        String[] result = new String[1];

        int i_decision = c.getColumnIndex(C_DECISION);
        if (c.moveToFirst()) {
            result[0] = c.getString(i_decision);
        } else
            result[0] = "2";
        c.close();
        Log.i(TAG, "DecisionDatabaseGetDecisionData");
        return Integer.parseInt(result[0]);
    }

}

这里是日志和异常

    06-08 11:16:37.869: I/Main(326): mainonCreate
    06-08 11:16:37.909: I/DatabaseHelper(326): AysonuDatabaseConstructor
    06-08 11:16:38.351: D/DatabaseHelper(326): onCreate sql: CREATE TABLE harcamalar (c_id integer primary key autoincrement,spinnerYillar integer,spinnerAylar TEXT,editTextBakici integer,editTextKrediAraba integer,editTextKrediOgrenim integer,editTextKrediTatil integer,editTextFaturaElektrik integer,editTextFaturaSu integer,editTextFaturaInternet integer,editTextAidat integer,editTextKaskoSigorta integer,editTextDigerTaksitler integer,editTextDiger integer,editTextMaasSelo integer,editTextMaasHilal integer,editTextDigerGelirler integer,editTextToplamHarcama integer,editTextToplamGelir integer, editTextEldeKalan integer, UNIQUE (spinnerYillar,spinnerAylar) ON CONFLICT REPLACE);
    06-08 11:16:38.369: I/DatabaseHelper(326): AysonuDatabaseOncreate
    06-08 11:16:38.399: I/DatabaseHelper(326): AysonuDatabaseOpen
    06-08 11:16:38.409: I/DbHelperTemporary(326): TemporaryDatabaseConstructor
    06-08 11:16:38.579: D/DbHelperTemporary(326): onCreate sql: CREATE TABLE ayyil (_id integer primary key autoincrement,spinnerYillar integer,spinnerAylar TEXT, dialogDecision integer);
    06-08 11:16:38.639: I/DbHelperTemporary(326): TemporaryDatabaseOpen
    06-08 11:16:38.669: I/DbHelperTemporary2(326): DecisionDatabaseConstructor
    06-08 11:16:38.929: D/DbHelperTemporary2(326): onCreate sql: CREATE TABLE decision (_id integer primary key autoincrement, dialogDecision integer);
    06-08 11:16:38.990: I/DbHelperTemporary2(326): DecisionDatabaseOpen
    06-08 11:16:38.999: I/Main(326): mainonResume
    06-08 11:17:50.229: W/KeyCharacterMap(326): No keyboard for id 0
    06-08 11:17:50.240: W/KeyCharacterMap(326): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
    06-08 11:18:42.569: I/Main(326): mainHesaplayan
    06-08 11:19:32.549: I/DatabaseHelper(326): AysonuDatabaseEntryElse
    06-08 11:19:32.639: I/Main(326): mainKaydeden
    06-08 11:19:40.059: I/DatabaseHelper(326): AysonuDatabaseEntryIf
    06-08 11:19:40.069: I/DbHelperTemporary2(326): DecisionDatabaseConstructor
    06-08 11:19:40.119: I/DbHelperTemporary2(326): DecisionDatabaseGetDecisionData
    06-08 11:19:40.169: I/Main(326): mainKaydeden
    06-08 11:19:40.190: D/DbHelperTemporary2(326): Couldn't open database aySonuDecisionDB.sql
    06-08 11:19:40.190: W/System.err(326): java.lang.NullPointerException
    06-08 11:19:40.209: W/System.err(326):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98)
    06-08 11:19:40.209: W/System.err(326):  at com.bilge.aysonu.DecisionDatabase.open(DecisionDatabase.java:69)
    06-08 11:19:40.219: W/System.err(326):  at com.bilge.aysonu.MyDialogFragment.onCreateDialog(MyDialogFragment.java:23)
    06-08 11:19:40.239: W/System.err(326):  at android.support.v4.app.DialogFragment.getLayoutInflater(DialogFragment.java:295)
    06-08 11:19:40.239: W/System.err(326):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
    06-08 11:19:40.249: W/System.err(326):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
    06-08 11:19:40.269: W/System.err(326):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
    06-08 11:19:40.289: W/System.err(326):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
    06-08 11:19:40.289: W/System.err(326):  at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
    06-08 11:19:40.309: W/System.err(326):  at android.os.Handler.handleCallback(Handler.java:587)
    06-08 11:19:40.309: W/System.err(326):  at android.os.Handler.dispatchMessage(Handler.java:92)
    06-08 11:19:40.330: W/System.err(326):  at android.os.Looper.loop(Looper.java:123)
    06-08 11:19:40.330: W/System.err(326):  at android.app.ActivityThread.main(ActivityThread.java:4627)
    06-08 11:19:40.339: W/System.err(326):  at java.lang.reflect.Method.invokeNative(Native Method)
    06-08 11:19:40.339: W/System.err(326):  at java.lang.reflect.Method.invoke(Method.java:521)
    06-08 11:19:40.360: W/System.err(326):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    06-08 11:19:40.360: W/System.err(326):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
    06-08 11:19:40.369: W/System.err(326):  at dalvik.system.NativeStart.main(Native Method)
    06-08 11:19:40.383: I/MyDialogFragment(326): MyDialogFragmentOnCreateDialog
    06-08 11:19:40.839: I/MyDialogFragment(326): MyDialogFragmentOnStart
06-08 11:38:26.058: E/AndroidRuntime(326): FATAL EXCEPTION: main
06-08 11:38:26.058: E/AndroidRuntime(326): java.lang.NullPointerException
06-08 11:38:26.058: E/AndroidRuntime(326):  at com.bilge.aysonu.DecisionDatabase.EntryDecision(DecisionDatabase.java:94)
06-08 11:38:26.058: E/AndroidRuntime(326):  at com.bilge.aysonu.MyDialogFragment$2.onClick(MyDialogFragment.java:44)
06-08 11:38:26.058: E/AndroidRuntime(326):  at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:158)
06-08 11:38:26.058: E/AndroidRuntime(326):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-08 11:38:26.058: E/AndroidRuntime(326):  at android.os.Looper.loop(Looper.java:123)
06-08 11:38:26.058: E/AndroidRuntime(326):  at android.app.ActivityThread.main(ActivityThread.java:4627)
06-08 11:38:26.058: E/AndroidRuntime(326):  at java.lang.reflect.Method.invokeNative(Native Method)
06-08 11:38:26.058: E/AndroidRuntime(326):  at java.lang.reflect.Method.invoke(Method.java:521)
06-08 11:38:26.058: E/AndroidRuntime(326):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-08 11:38:26.058: E/AndroidRuntime(326):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-08 11:38:26.058: E/AndroidRuntime(326):  at dalvik.system.NativeStart.main(Native Method)

感谢您的帮助……
我想这可能是因为您在EntryDesicion方法中调用了先删除后插入，因此表被删除了。该表已被删除，因此您无法在其上插入任何数据
您确定问题出在我们的数据库中。insert？请再次检查完整StackTrace的Post。ıposted stack trace。是否确定作为DecisionDatabase构造函数参数提供的上下文不为null？我不确定。还有一些其他的数据库类。他们对决策数据库做了类似的事情，并且工作正常。我将如何检查它是否为null？我删除delete方法。但还是一样的例外。我相信在这种情况下，delete和insert都不是DDL操作。这意味着他分别删除和插入了“决策”表的记录。你是对的。我刚刚检查了文档，传递null将删除所有行。OP是否可以创建一个git，以便我可以获取代码和所有资源文件？对于所有连续的回复，我深表歉意。你能用MyDialogFragment.this.i引用我吗？