Question

我有一个课，我在其中声明：

public class Comune implements Serializable {
    public String id;
    public String name;

    public Comune(String id, String name) {
        this.id = id;
        this.name = name;
    }

    @Override
    public String toString() {
        return name;
    }

}

然后是另一个类：

public class Comuni {

    public static final Comune[] comuni = {
        new Comune("A093|AGUGLIARO|1","AGUGLIARO"),
        new Comune("A154|ALBETTONE|1","ALBETTONE"),
    ---
    ---
    };
}

然后我有一个带有2个微调器和一个按钮的片段。当我点击微调器（是一个autocompletetextview，其中出现微调器）时，它会显示＆＃34; Comune＆＃34;我可以选择我想要的项目。当我有两个autocompletetextview的两个值并单击按钮时，我在第二个屏幕中传递了一个putExtra传递的2个值的旋转器，如下所示：

Intent intent = new Intent(getActivity(), SceltaFermateActivity.class);
                    intent.putExtra(SceltaFermateActivity.EXTRA_COMUNE_PARTENZA, itemPartenze);
                    intent.putExtra(SceltaFermateActivity.EXTRA_COMUNE_ARRIVO, itemArrivi);
                    startActivity(intent);

我尝试实现一个sqlite，我可以在列表视图中保存微调器的2个值，这样我就可以显示＆＃34;最后的结果＆＃34;。要从列表视图中检索值，我使用光标如：

lv.setOnItemClickListener(new OnItemClickListener() {
             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                   Cursor cursor = (Cursor) parent.getItemAtPosition(position);
                   String item_partenza = cursor.getString(cursor.getColumnIndex(mdb.KEY_PARTENZA));
                   String item_arrivo = cursor.getString(cursor.getColumnIndex(mdb.KEY_ARRIVO));


                   /*String item = String.valueOf(item_id) + " : " + item_partenza +"\n"+item_arrivo;
                   Toast.makeText(getActivity(), item, Toast.LENGTH_LONG).show();*/
             }
         });

它有效！问题是，我会点击listview项目直接传递这两个值，依此类推它将打开第二个屏幕。但如果我通过

Intent intent = new Intent(getActivity(), SceltaFermateActivity.class);
                   intent.putExtra(SceltaFermateActivity.EXTRA_COMUNE_PARTENZA, item_partenza);
                   intent.putExtra(SceltaFermateActivity.EXTRA_COMUNE_ARRIVO, item_arrivo);
                   startActivity(intent);

崩溃是因为它说：String cannot be cast解决方案？也许是一种在我点击项目时将字符串放入AutoCompleteTextView的方法吗？

日志：

04-20 00:54:48.284: E/AndroidRuntime(29566): FATAL EXCEPTION: main
04-20 00:54:48.284: E/AndroidRuntime(29566): Process: com.dd.ftv, PID: 29566
04-20 00:54:48.284: E/AndroidRuntime(29566): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dd.ftv/com.dd.ftv.SceltaFermateActivity}: java.lang.ClassCastException: java.lang.String cannot be cast to it.ftv.app.model.Comune
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.ActivityThread.access$800(ActivityThread.java:144)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.os.Handler.dispatchMessage(Handler.java:102)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.os.Looper.loop(Looper.java:135)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.ActivityThread.main(ActivityThread.java:5223)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at java.lang.reflect.Method.invoke(Native Method)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at java.lang.reflect.Method.invoke(Method.java:372)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:117)
04-20 00:54:48.284: E/AndroidRuntime(29566): Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to it.ftv.app.model.Comune
04-20 00:54:48.284: E/AndroidRuntime(29566):    at com.dd.ftv.SceltaFermateActivity.onCreate(SceltaFermateActivity.java:72)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.Activity.performCreate(Activity.java:5933)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
04-20 00:54:48.284: E/AndroidRuntime(29566):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
04-20 00:54:48.284: E/AndroidRuntime(29566):    ... 11 more

字符串不能转换为Object

0 个答案: