Question

我无法将数据库中的数据检索到微调器中。这是无法带来微调器的源代码。我一直在制作方法并从数据库中检索它，但数据库中的数据也没有显示出来。请帮忙..

private void loadModuledate(){
    DBDataSource db = new DBDataSource(getApplicationContext());
    ArrayList<ProductModule> lables = db.getAllmodule();
    // Creating adapter for spinner
    ArrayAdapter<ProductModule> dataAdapter = new ArrayAdapter<ProductModule>(this,
            android.R.layout.simple_spinner_item, lables);

    // Drop down layout style - list view with radio button
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    // attaching data adapter to spinner
    edModul.setAdapter(dataAdapter);
}

这是我的DBDatasource.java

public ArrayList<ProductModule> getAllmodule() {
    ArrayList<ProductModule> daftarproductmodule = new ArrayList<ProductModule>();
    Cursor cursor = database.query(DBHelper.PRODUCT_MODULE,
            allProductModule, null, null, null, null, null);
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        ProductModule ProductModule = cursorToProductModule(cursor);
        daftarproductmodule.add(ProductModule);
        cursor.moveToNext();
    }
    cursor.close();
    return daftarproductmodule;
}

这是我的日志猫

02-24 14:57:07.445: E/AndroidRuntime(16981): FATAL EXCEPTION: main
02-24 14:57:07.445: E/AndroidRuntime(16981): java.lang.RuntimeException: Unable to start activity ComponentInfo{ims.app.mobileorder/ims.app.mobileorder.FormComplain}: java.lang.NullPointerException
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2062)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2087)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.ActivityThread.access$600(ActivityThread.java:133)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1198)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.os.Looper.loop(Looper.java:137)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.ActivityThread.main(ActivityThread.java:4803)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at java.lang.reflect.Method.invokeNative(Native Method)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at java.lang.reflect.Method.invoke(Method.java:511)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at dalvik.system.NativeStart.main(Native Method)
02-24 14:57:07.445: E/AndroidRuntime(16981): Caused by: java.lang.NullPointerException
02-24 14:57:07.445: E/AndroidRuntime(16981):    at ims.app.mobileorder.DBDataSource.getAllmodule(DBDataSource.java:101)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at ims.app.mobileorder.FormComplain.loadModuledate(FormComplain.java:63)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at ims.app.mobileorder.FormComplain.onCreate(FormComplain.java:46)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.Activity.performCreate(Activity.java:5008)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
02-24 14:57:07.445: E/AndroidRuntime(16981):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2026)
02-24 14:57:07.445: E/AndroidRuntime(16981):    ... 11 more
02-24 14:57:10.698: E/Trace(17357): error opening trace file: No such file or directory (2)

Answer 1

public ArrayList<ProductModule> getAllmodule() {

SQLiteDataBase sqLiteDatabase = dbHelper.openDataBase（）;

        ArrayList<ProductModule> daftarproductmodule = new ArrayList<ProductModule>();
        Cursor cursor = database.query(DBHelper.PRODUCT_MODULE,
                allProductModule, null, null, null, null, null);
        cursor.moveToFirst();
        while (!cursor.isAfterLast()) {
            ProductModule ProductModule = cursorToProductModule(cursor);
          daftarproductmodule.add(ProductModule);
          cursor.moveToNext();
        }
        cursor.close();
        return daftarproductmodule;
      }

我希望你能解决你的错误。

如何将sqlite值填充到微调器中

1 个答案: