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我有一个在两个列表视图中显示搜索结果（在我的数据库中）的活动。问题是每次我运行应用程序时应用程序总是崩溃。这就是 logcat 向我展示的内容：

07-02 12:42:15.940: E/CursorWindow(23645): Bad request for field slot 0,1. numRows = 10, numColumns = 1
07-02 12:42:15.980: E/AndroidRuntime(23645): FATAL EXCEPTION: main
07-02 12:42:15.980: E/AndroidRuntime(23645): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.series3/com.example.series3.FindMePlace}: java.lang.IllegalStateException: get field slot from row 0 col 1 failed
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.os.Looper.loop(Looper.java:123)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.app.ActivityThread.main(ActivityThread.java:3683)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at java.lang.reflect.Method.invokeNative(Native Method)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at java.lang.reflect.Method.invoke(Method.java:507)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at dalvik.system.NativeStart.main(Native Method)
07-02 12:42:15.980: E/AndroidRuntime(23645): Caused by: java.lang.IllegalStateException: get field slot from row 0 col 1 failed
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.database.CursorWindow.getString_native(Native Method)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.database.CursorWindow.getString(CursorWindow.java:329)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:49)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at com.example.series3.DatabaseHandler.getAllFromLocation(DatabaseHandler.java:737)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at com.example.series3.FindMePlace.populateFromLocation(FindMePlace.java:108)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at com.example.series3.FindMePlace.onCreate(FindMePlace.java:53)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-02 12:42:15.980: E/AndroidRuntime(23645):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)

这是我的代码的一部分。

FindMePlace.java

    private void populateToDestination() {
            List<UkmRoute> destination = db.getAllToDestination();
            for (UkmRoute k : destination) {
                results.add(k.getToDestination());
                results_id.add(k.getID());
            }
            if (!filterText2.getText().toString().equals(""))
                adapter = new ArrayAdapter<String>(FindMePlace.this,
                        R.layout.list_item, R.id.textView1, results);
            else {
                ArrayList<String> r = new ArrayList<String>();
                adapter = new ArrayAdapter<String>(FindMePlace.this,
                        R.layout.list_item, R.id.textView1, r);
            }
            setListAdapter(adapter);

            // Set ListView from ListActivity
            ListView lv2 = getListView();
            lv2.setTextFilterEnabled(true);

            // Set click event from listView
            lv2.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    // When clicked, show a toast with the TextView text
                    Toast.makeText(getApplicationContext(),
                            ((TextView) view).getText(), Toast.LENGTH_SHORT).show();

                    Log.d("test", "position:" + position);

                    Log.d("test",
                            "actualname:"
                                    + db.getUkmRouteByTo(adapter.getItem(position))
                                            .getFromLocation());

                    // String poiID = results_id.get(position);
                    String poiID = db.getUkmRouteByTo(adapter.getItem(position))
                            .getID();
                    setSelectedPoi(poiID);
                    // startActivity(c);

                }
            });

        }
private void populateFromLocation() {
        // Reading location
        Log.d("Reading", "Reading all location ..");
        List<UkmRoute> location = db.getAllFromLocation();

        for (UkmRoute k : location) {
            results.add(k.getFromLocation());
            results_id.add(k.getID());
        }
        // Set list arrayAdapter to adapter
        if (!filterText.getText().toString().equals(""))
            adapter = new ArrayAdapter<String>(FindMePlace.this,
                    R.layout.list_item, R.id.textView1, results);
        else {
            ArrayList<String> r = new ArrayList<String>();
            adapter = new ArrayAdapter<String>(FindMePlace.this,
                    R.layout.list_item, R.id.textView1, r);
        }

        // adapter = new ArrayAdapter<String>(this, R.layout.list_item,
        // R.id.textView1, results);
        setListAdapter(adapter);

        // Set ListView from ListActivity
        ListView lv = getListView();
        lv.setTextFilterEnabled(true);

        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // When clicked, show a toast with the TextView text
                Toast.makeText(getApplicationContext(),
                        ((TextView) view).getText(), Toast.LENGTH_SHORT).show();

                Log.d("test", "position:" + position);

                Log.d("test",
                        "actualname:"
                                + db.getUkmRouteByFrom(
                                        adapter.getItem(position))
                                        .getFromLocation());

                // String poiID = results_id.get(position);
                String poiID = db.getUkmRouteByFrom(adapter.getItem(position))
                        .getID();
                setSelectedPoi(poiID);
                // startActivity(c);

            }
        });
    }

数据库处理程序.java

public List<UkmRoute> getAllToDestination() {
        List<UkmRoute> ToList = new ArrayList<UkmRoute>();
        //Select All Query
        String selectQuery = "SELECT DISTINCT ToDestination FROM " + TABLE_UKMROUTE; 

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        //looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {
                UkmRoute poi = new UkmRoute();
                poi.setID(cursor.getString(0));
                poi.setFromLocation(cursor.getString(1));
                poi.setToDestination(cursor.getString(2));
                poi.setRoute1(cursor.getString(3));
                poi.setRoute2(cursor.getString(4));
                //Adding kategori to list
                ToList.add(poi);

            } while (cursor.moveToNext());
        }

        // return Kategori list
        return ToList;
    }
        public List<UkmRoute> getAllFromLocation() {
            List<UkmRoute> ToList = new ArrayList<UkmRoute>();
            //Select All Query
            String selectQuery = "SELECT DISTINCT FromLocation FROM " + TABLE_UKMROUTE; 

            SQLiteDatabase db = this.getReadableDatabase();
            Cursor cursor = db.rawQuery(selectQuery, null);

            //looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
                    UkmRoute poi = new UkmRoute();
                    poi.setID(cursor.getString(0));
                    poi.setFromLocation(cursor.getString(1));
                    poi.setToDestination(cursor.getString(2));
                    poi.setRoute1(cursor.getString(3));
                    poi.setRoute2(cursor.getString(4));
                    //Adding kategori to list
                    ToList.add(poi);

                } while (cursor.moveToNext());
            }

            // return Kategori list
            return ToList;
            }

我的 sql 查询有什么问题吗？

String selectQuery = "SELECT DISTINCT ToDestination FROM " + TABLE_UKMROUTE;
4

1 回答 1

0

您的查询中只有一列ToDestination。但是您尝试从不止一列中获取信息：

poi.setID(cursor.getString(0));
            poi.setFromLocation(cursor.getString(1));
            poi.setToDestination(cursor.getString(2));
            poi.setRoute1(cursor.getString(3));
            poi.setRoute2(cursor.getString(4));

尝试这个：

"SELECT DISTINCT ID, FromLocation, ToDestination, Route1, Route2 FROM " + TABLE_UKMROUTE;

或者

    "SELECT DISTINCT * FROM " + TABLE_UKMROUTE;

和

poi.setID(cursor.getInteger("ID")); // getInteger only if ID is an Integer
            poi.setFromLocation(cursor.getString("FromLocation"));
            poi.setToDestination(cursor.getString("ToDestination"));
            poi.setRoute1(cursor.getString("Route1"));
            poi.setRoute2(cursor.getString("Route2"));
于 2013-07-02T14:07:36.967 回答