Question

我试图从listview获取项目的值，但是当我尝试“adapter.getItem（position）”时，我收到了一个强制转换错误。

我假设getItem函数是发生错误的地方，根据日志，但我不确定我怎么能将值传递给字符串？

相关代码是：

public String getItem(int pos) {

        String myString = (String) adapter.getItem(pos);
        return myString;

    }

    private OnItemClickListener onAnswerClicked = new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

                String getValue = getItem(position);

                Toast.makeText(getApplicationContext(),
                  "Click ListItem Number " + getValue, Toast.LENGTH_LONG)
                  .show();


        }

    };

我在logcat中收到的错误是：

12-18 10:50:02.314: E/AndroidRuntime(18988): FATAL EXCEPTION: main
12-18 10:50:02.314: E/AndroidRuntime(18988): java.lang.ClassCastException: android.database.sqlite.SQLiteCursor cannot be cast to java.lang.String
12-18 10:50:02.314: E/AndroidRuntime(18988):    at com.sembasys.metrosleepnyc.ChooseRoute.getItem(ChooseRoute.java:61)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at com.sembasys.metrosleepnyc.ChooseRoute$1.onItemClick(ChooseRoute.java:72)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.widget.AdapterView.performItemClick(AdapterView.java:298)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.widget.AbsListView$1.run(AbsListView.java:3423)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.os.Handler.handleCallback(Handler.java:725)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.os.Looper.loop(Looper.java:137)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at android.app.ActivityThread.main(ActivityThread.java:5039)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at java.lang.reflect.Method.invokeNative(Native Method)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at java.lang.reflect.Method.invoke(Method.java:511)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-18 10:50:02.314: E/AndroidRuntime(18988):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

这是因为你将Cursor传递给ListView并转换String而不是Cursor。但是，我坚持不将Cursor传递给ListView，而是可以从某些Collection可能的ArrayList中的Cursor获取数据，然后将ArrayList传递给ListView的适配器。

无法在getItem中转换值

1 个答案: