单击列表视图时如何显示警报对话框

Question

我想在单击我的活动的列表视图时显示警报对话框，我有一个显示警报对话框的代码，但我知道我的代码有问题，我不知道如何修复它，警报没有显示我想要的，但在 DDMS 中得到我想要的结果。这是我的代码：

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {

new bike_type_dao(responsetype).view_bike_type();

final Entity_Brand brand = adapterBrand.getItem(position);

LayoutInflater li = (LayoutInflater) this
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = li.inflate(R.layout.listview_activity, null, false);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(brand.getBrand_name());
builder.setView(view);

ListView listtype = (ListView) view.findViewById(R.id.list_sepeda);
listtype.setOnClickListener((OnClickListener) this);
listtype.setAdapter(new ArrayAdapter<Entity_Bike_Type>(this,
        android.R.layout.simple_list_item_1, arrayList));
listtype.setOnItemClickListener((OnItemClickListener) this);

builder.create().show();

}

谢谢。

那是我的日志猫：

09-18 11:52:07.819: E/HttpResponse(25866): {"result":1,"data":[{"0":"1","id_brand":"1","1 ":"Polygon","brand_name":"Polygon"},{"0":"2","id_brand":"2","1":"United Bike","brand_name":"United Bike"} ,{"0":"3","id_brand":"3","1":"WimCycle","brand_name":"WimCycle"}]} 09-18 11:52:09.669: D/AndroidRuntime(25866): 关闭虚拟机 09-18 11:52:09.669: W/dalvikvm(25866): threadid=1: 线程以未捕获的异常退出 (group=0x40018578) 09-18 11:52:09.679：E/AndroidRuntime（25866）：致命异常：主要 09-18 11:52:09.679: E/AndroidRuntime(25866): java.lang.ClassCastException: com.wilis.hellotabwidget.Tab_Brand_ListView_Activity 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 com.wilis.hellotabwidget.Tab_Brand_ListView_Activity.onListItemClick(Tab_Brand_ListView_Activity.java:158) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.app.ListActivity$2.onItemClick(ListActivity.java:319) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.widget.AdapterView.performItemClick(AdapterView.java:284) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.widget.ListView.performItemClick(ListView.java:3755) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.widget.AbsListView$PerformClick.run(AbsListView.java:1964) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.os.Handler.handleCallback(Handler.java:587) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.os.Handler.dispatchMessage(Handler.java:92) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.os.Looper.loop(Looper.java:130) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 android.app.ActivityThread.main(ActivityThread.java:3687) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 java.lang.reflect.Method.invokeNative(Native Method) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 java.lang.reflect.Method.invoke(Method.java:507) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 09-18 11:52:09.679: E/AndroidRuntime(25866): 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 09-18 11:52:09.679: E/AndroidRuntime(25866): at dalvik.system.NativeStart.main(Native Method) 09-18 11:52:09.809: E/HttpResponse(25866): {"result":1,"data":[{"0":"1","id_type":"1","1":"越野 (XC)","type_name":"越野 (XC)"},{"0":"2","id_type":"2","1":"BMX","type_name":" BMX"},{"0":"3","id_type":"3","1":"Free Ride (FR)","type_name":"Free Ride (FR)"},{"0" :"4","id_type":"4","1":"DownHill (DH)","type_name":"DownHill (DH)"},{"0":"5","id_type":" 5","1":"DirtJump (DJ)","type_name":"DirtJump (DJ)"},{"0":"6","id_type":"6","1":"公路自行车","type_name":"公路自行车"}]}

Answer 1

这可能对你有帮助

    listview.setOnItemClickListener(new OnItemClickListener(){

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


            AlertDialog.Builder adb = new AlertDialog.Builder(
                    MainActivity.this);
                    adb.setTitle("List");
                    adb.setMessage(" selected Item is="
                    +parent.getItemAtPosition(position));
                    adb.setPositiveButton("Ok", null);
                    adb.show();    

        }

    });

这里用你的类名更改 MainActivity.this

Answer 2

这是来自Android Developers：
首先我创建了这个类，

@SuppressLint("NewApi") 
public class ChangeLanguageDialog extends DialogFragment{

    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage(R.string.app_name)
               .setPositiveButton(R.string.save, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                   }
               })
               .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                   }
               });
        return builder.create();
    }

}

然后把它放在你想调用对话框的地方

ChangeLanguageDialog dialog = new ChangeLanguageDialog();
FragmentManager fm = getFragmentManager();
dialog.show(fm, "language");