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sqlite db からデータを取得してテキスト ビューに設定しようとすると強制終了します。取得方法は次のとおりです。

public ArrayList<Object> getRow() {

        ArrayList<Object> list= new ArrayList<Object>();
        Cursor cursor;
        String[] columns={PRIMARY_KEY,COLUMN_NAME,COLUMN_EMAIL,COLUMN_PASSWORD,COLUMN_PASSWORD};



        cursor= sp.query(TABLE_NAME,columns,null,null,null,null,null);
                int i_id=cursor.getColumnIndex(PRIMARY_KEY);
        int i_name=cursor.getColumnIndex(COLUMN_NAME);
        int i_contact=cursor.getColumnIndex(COLUMN_CONTACT);
        int i_email=cursor.getColumnIndex(COLUMN_EMAIL);
        int i_pass=cursor.getColumnIndex(COLUMN_PASSWORD);


        for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext())
        {

                list.add(cursor.getLong(i_id));
                list.add(cursor.getString(i_name));
                list.add(cursor.getString(i_contact));
                list.add(cursor.getString(i_email));
                list.add(cursor.getString(i_pass));

        }   


        return list;
    }


}

これがsettextのコードです。助けてください。可能な限りすべてを試しました。テーブルが作成され、値が挿入されますが、フェッチは機能しません。

private void getTable() {



info.open();
    try{

    ArrayList<Object> list= info.getRow();

    AccBalanceTV.setText((String)list.get(1));
    AccEmailTV.setText((String)list.get(2));
    AccContactTV.setText( (String)list.get(3));
    AccVehTV.setText((String)list.get(4));
    }
    catch(Exception e)
    {
        Toast.makeText(getApplicationContext(), String.valueOf(e), Toast.LENGTH_LONG).show();
    }
    finally{
        info.close();
    }
    }

ログキャット:

03-09 21:09:46.180: D/dalvikvm(10971): GC_FOR_ALLOC freed 57K, 6% free 12245K/12931K, paused 10ms, total 11ms
03-09 21:09:46.185: I/dalvikvm-heap(10971): Grow heap (frag case) to 16.032MB for 3686416-byte allocation
03-09 21:09:46.195: D/dalvikvm(10971): GC_CONCURRENT freed 1K, 5% free 15844K/16583K, paused 1ms+1ms, total 11ms
03-09 21:09:46.250: D/dalvikvm(10971): GC_FOR_ALLOC freed <1K, 5% free 16873K/17671K, paused 9ms, total 9ms
03-09 21:09:46.250: I/dalvikvm-heap(10971): Grow heap (frag case) to 18.815MB for 1865972-byte allocation
03-09 21:09:46.270: D/dalvikvm(10971): GC_CONCURRENT freed <1K, 5% free 18695K/19527K, paused 11ms+2ms, total 21ms
03-09 21:09:46.315: D/libEGL(10971): loaded /system/lib/egl/libEGL_mali.so
03-09 21:09:46.320: D/libEGL(10971): loaded /system/lib/egl/libGLESv1_CM_mali.so
03-09 21:09:46.320: D/libEGL(10971): loaded /system/lib/egl/libGLESv2_mali.so
03-09 21:09:46.325: D/(10971): Device driver API match
03-09 21:09:46.325: D/(10971): Device driver API version: 10
03-09 21:09:46.325: D/(10971): User space API version: 10 
03-09 21:09:46.325: D/(10971): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 
03-09 21:09:46.350: D/OpenGLRenderer(10971): Enabling debug mode 0
03-09 21:09:48.205: D/dalvikvm(10971): GC_FOR_ALLOC freed 1041K, 10% free 17741K/19527K, paused 9ms, total 9ms
03-09 21:09:48.210: I/dalvikvm-heap(10971): Grow heap (frag case) to 21.545MB for 3840016-byte allocation
03-09 21:09:48.220: D/dalvikvm(10971): GC_CONCURRENT freed 2K, 8% free 21489K/23303K, paused 1ms+1ms, total 12ms
03-09 21:09:48.415: E/SpannableStringBuilder(10971): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
03-09 21:09:48.415: E/SpannableStringBuilder(10971): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
03-09 21:09:56.660: D/AbsListView(10971): Get MotionRecognitionManager
03-09 21:09:57.990: D/GestureDetector(10971): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 3 mFalseSizeCnt:0
03-09 21:09:58.135: D/AndroidRuntime(10971): Shutting down VM
03-09 21:09:58.135: W/dalvikvm(10971): threadid=1: thread exiting with uncaught exception (group=0x411cb2a0)
03-09 21:09:58.140: E/AndroidRuntime(10971): FATAL EXCEPTION: main
03-09 21:09:58.140: E/AndroidRuntime(10971): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.miniproject.parkme/com.miniproject.parkme.Account}: java.lang.NullPointerException
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2024)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.os.Looper.loop(Looper.java:137)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.app.ActivityThread.main(ActivityThread.java:4898)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at java.lang.reflect.Method.invokeNative(Native Method)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at java.lang.reflect.Method.invoke(Method.java:511)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at dalvik.system.NativeStart.main(Native Method)
03-09 21:09:58.140: E/AndroidRuntime(10971): Caused by: java.lang.NullPointerException
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:228)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at com.miniproject.parkme.databaseManager.<init>(databaseManager.java:40)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at com.miniproject.parkme.Account.<init>(Account.java:12)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at java.lang.Class.newInstanceImpl(Native Method)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at java.lang.Class.newInstance(Class.java:1319)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
03-09 21:09:58.140: E/AndroidRuntime(10971):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2015)
03-09 21:09:58.140: E/AndroidRuntime(10971):    ... 11 more
03-09 21:10:07.220: I/Process(10971): Sending signal. PID: 10971 SIG: 9
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1 に答える 1

0

LogCatから：

Caused by: java.lang.NullPointerException
    ...
    at com.miniproject.parkme.databaseManager.<init>(databaseManager.java:40)
    at com.miniproject.parkme.Account.<init>(Account.java:12)

info無効なコンテキストで初期化しているようです。
これを行うことはできません。後でNullPointerExceptionが発生します。

private DBHelper info = new DBHelper(this);

アクティビティのコンテキストが有効になるまで待つ必要があります。

private DBHelper info;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    info = new DBHelper(this);
于 2013-03-09T15:46:47.513 に答える