整數字符串從數據庫

我已經存儲了我的價值在數據庫中followes：整數字符串從數據庫

"CREATE TABLE " + 
     ABezoeAdapter.databasetabel + "(" + 
     ABezoeAdapter.recordnummer + " INTEGER, " + 
     ABezoeAdapter.bezoekrapportnummer + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
     ABezoeAdapter.bezoekrapportdatum + " DATETIME NOT NULL, " + 
     ABezoeAdapter.herstellingsoort + " VARCHAR(1) NOT NULL, " +

，但是這給了我的問題如下閱讀常規

Cursor c = onzedatabase.query(databasetabel, allekolommen, bezoekrapportnummer + "=?", new String[] {bezoeknummer}, null, null, null); 

     int i = 0; 
     String data[] = new String[30]; 
     data = null; 
     for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){ 
      data[i] = c.getString(i); 
      Log.i("abezoeadapter gegevenslezenvanbezoeknummer", "bezoeknummer = " + data[2]); 
     }

出的logcat我覺得我得到因爲我的值存儲爲整數，字符串，一個問題...

的logcat：

03-24 18:36:06.321: E/AndroidRuntime(785): FATAL EXCEPTION: main 
03-24 18:36:06.321: E/AndroidRuntime(785): java.lang.RuntimeException: Unable to start activity  ComponentInfo{com.example.deceunincktechniekers/com.example.deceunincktechniekers.bezoekrapporten}:  java.lang.NullPointerException 
03-24 18:36:06.321: E/AndroidRuntime(785): at  android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
03-24 18:36:06.321: E/AndroidRuntime(785): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
03-24 18:36:06.321: E/AndroidRuntime(785): at android.app.ActivityThread.access$600(ActivityThread.java:141) 
03-24 18:36:06.321: E/AndroidRuntime(785): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
03-24 18:36:06.321: E/AndroidRuntime(785): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-24 18:36:06.321: E/AndroidRuntime(785): at android.os.Looper.loop(Looper.java:137) 
03-24 18:36:06.321: E/AndroidRuntime(785): at android.app.ActivityThread.main(ActivityThread.java:5041) 
03-24 18:36:06.321: E/AndroidRuntime(785): at java.lang.reflect.Method.invokeNative(Native Method) 
03-24 18:36:06.321: E/AndroidRuntime(785): at java.lang.reflect.Method.invoke(Method.java:511) 
03-24 18:36:06.321: E/AndroidRuntime(785): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
03-24 18:36:06.321: E/AndroidRuntime(785): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
03-24 18:36:06.321: E/AndroidRuntime(785): at dalvik.system.NativeStart.main(Native Method) 
03-24 18:36:06.321: E/AndroidRuntime(785): Caused by: java.lang.NullPointerException 
03-24 18:36:06.321: E/AndroidRuntime(785): at com.example.deceunincktechniekers.ABezoeAdapter.gegevenslezenvanbezoeknummer(ABezoeAdapter.java:480) 
03-24 18:36:06.321: E/AndroidRuntime(785): at com.example.deceunincktechniekers.bezoekrapporten.opslaan(bezoekrapporten.java:784)

什麼可以爲我不同類型的值的解決方案互聯網搜索didnt幫了我至今

在此先感謝

來源

2014-03-24 keuninkske

String data[] = new String[30]; 
data = null;

分配data到null，然後嘗試將值賦給它。因此NPE。刪除data = null。

要處理可變數目的條目，請考慮使用例如ArrayList<String>而不是String[]。

來源

2014-03-24 18:56:20 laalto

整數字符串從數據庫

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