0

別の関数で関数を呼び出そうとしていますが、nullpointerExceptionや他の多くのエラーが発生します。

public float maxFat() {

    SharedPreferences customSharedPreference = getSharedPreferences(
            "myCustomSharedPrefs", Activity.MODE_PRIVATE);

    float cals = customSharedPreference.getFloat("calpref", 0f);
    float maxfat = cals / 36;

    return maxfat;
}

そして、これが私がそれを呼ぶところです

public XYMultipleSeriesDataset getFatDataset() {

    XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
    Cursor c = database.rawQuery("select * from dailystats;", null);
    float i = 1.0f;

    c.moveToFirst();
    XYSeries seriesFat = new XYSeries("Fat");
    XYSeries seriesMaxFat= new XYSeries("Maximum Fat");
    while (!c.isAfterLast()) {
        seriesFat.add(i++, c.getDouble(2));
        StatsActivity stats= new StatsActivity();
        seriesMaxFat.add(i, stats.maxFat());
        c.moveToNext();
    }
    dataset.addSeries(seriesFat);
    dataset.addSeries(seriesMaxFat);
    return dataset;
}

これがログファイルです

05-05 11:39:22.737: E/AndroidRuntime(31282): java.lang.NullPointerException
05-05 11:39:22.737: E/AndroidRuntime(31282):    at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:153)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at com.nutriapp.StatsActivity.maxFat(StatsActivity.java:183)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at com.nutriapp.DatabaseAdapter.getFatDataset(DatabaseAdapter.java:396)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at com.nutriapp.FatActivity.getIntent(FatActivity.java:52)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at com.nutriapp.StatsActivity$1.onClick(StatsActivity.java:127)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at android.view.View.performClick(View.java:3511)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at android.view.View$PerformClick.run(View.java:14105)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at android.os.Handler.handleCallback(Handler.java:605)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at android.os.Handler.dispatchMessage(Handler.java:92)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at android.os.Looper.loop(Looper.java:137)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at android.app.ActivityThread.main(ActivityThread.java:4424)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at java.lang.reflect.Method.invokeNative(Native Method)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at java.lang.reflect.Method.invoke(Method.java:511)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-05 11:39:22.737: E/AndroidRuntime(31282):    at dalvik.system.NativeStart.main(Native Method)
05-05 11:39:22.937: D/dalvikvm(31282): GC_CONCURRENT freed 135K, 3% free 9633K/9863K, paused 17ms+29ms
05-05 11:39:23.047: E/SQLiteDatabase(31282): close() was never explicitly called on database '/data/data/com.nutriapp/databases/nutriwellness.db' 
05-05 11:39:23.047: E/SQLiteDatabase(31282): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1943)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1007)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:986)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1051)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:770)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:221)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at com.nutriapp.DatabaseAdapter.open(DatabaseAdapter.java:215)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at com.nutriapp.FatActivity.getIntent(FatActivity.java:49)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at com.nutriapp.StatsActivity$1.onClick(StatsActivity.java:127)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.view.View.performClick(View.java:3511)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.view.View$PerformClick.run(View.java:14105)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.os.Handler.handleCallback(Handler.java:605)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.os.Handler.dispatchMessage(Handler.java:92)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.os.Looper.loop(Looper.java:137)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at android.app.ActivityThread.main(ActivityThread.java:4424)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at java.lang.reflect.Method.invokeNative(Native Method)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at java.lang.reflect.Method.invoke(Method.java:511)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-05 11:39:23.047: E/SQLiteDatabase(31282):    at dalvik.system.NativeStart.main(Native Method)
05-05 11:39:23.047: E/System(31282): Uncaught exception thrown by finalizer
05-05 11:39:23.098: E/System(31282): java.lang.IllegalStateException: Don't have database lock!
05-05 11:39:23.098: E/System(31282):    at android.database.sqlite.SQLiteDatabase.verifyLockOwner(SQLiteDatabase.java:2090)
05-05 11:39:23.098: E/System(31282):    at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2182)
05-05 11:39:23.098: E/System(31282):    at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2178)
05-05 11:39:23.098: E/System(31282):    at android.util.LruCache.trimToSize(LruCache.java:197)
05-05 11:39:23.098: E/System(31282):    at android.util.LruCache.evictAll(LruCache.java:285)
05-05 11:39:23.098: E/System(31282):    at android.database.sqlite.SQLiteDatabase.deallocCachedSqlStatements(SQLiteDatabase.java:2143)
05-05 11:39:23.098: E/System(31282):    at android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:1126)
05-05 11:39:23.098: E/System(31282):    at android.database.sqlite.SQLiteDatabase.finalize(SQLiteDatabase.java:1914)
05-05 11:39:23.098: E/System(31282):    at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:182)
05-05 11:39:23.098: E/System(31282):    at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
05-05 11:39:23.098: E/System(31282):    at java.lang.Thread.run(Thread.java:856)
4

2 に答える 2

1

クラスStatsActivityは拡張されActivityますか？その場合、キーワードを使用してクラスの新しいインスタンスを作成することはできずnew、アプリケーションの設計を再考する必要があります。

于 2012-05-05T21:11:03.603 に答える
0

カーソルを閉じていないため、データベースが閉じられていないという例外が発生しています。ただする

c.close()

カーソルを使用した後、XYMultipleSeriesDataset 関数で。

于 2012-05-05T11:21:05.477 に答える