Question

我想将一个ListView中的clicked元素替换为另一个，但是有一个问题：没有方法可以从ListView中操作它，当我更改适配器时 - 它给了我ConcurrentModificationException，因为我在onItemClick中更改了它。这是代码中的问题部分。

    datasource = new IngredientsDataSource(this);
    datasource.open();

    final List<Ingredient> values_ing = datasource.getAllIngredients();
    final List<Ingredient> values_ch = values_ing.subList(0, 0);

    final ArrayAdapter<Ingredient> adapter_ing = new ArrayAdapter<Ingredient>(this, android.R.layout.simple_list_item_1, values_ing);
    list_ing.setAdapter(adapter_ing);

    final ArrayAdapter<Ingredient> adapter_ch = new ArrayAdapter<Ingredient>(this, android.R.layout.simple_list_item_1, values_ch);
    list_ch.setAdapter(adapter_ch);

    list_ing.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, final View itemClicked, int position, long id) {
            final Ingredient item = values_ing.get((int)id);
            list_ing.post(new Runnable() {
            @Override
            public void run() {
                values_ing.remove(item);
                adapter_ing.notifyDataSetChanged();
            }
            });

            list_ch.post(new Runnable() {
            @Override
            public void run() {
                values_ch.add(item);
                adapter_ch.notifyDataSetChanged();
            }
            });

这里是Logcat

 03-18 15:18:08.971 1027-1027/com.kochmarevsevolod.lazycook E/AndroidRuntime: FATAL EXCEPTION: main
                                                                         java.util.ConcurrentModificationException
                                                                             at java.util.AbstractList$SubAbstractList.size(AbstractList.java:360)
                                                                             at java.util.AbstractList.add(AbstractList.java:425)
                                                                             at com.kochmarevsevolod.lazycook.Search_Page$1$2.run(Search_Page.java:73)
                                                                             at android.os.Handler.handleCallback(Handler.java:615)
                                                                             at android.os.Handler.dispatchMessage(Handler.java:92)
                                                                             at android.os.Looper.loop(Looper.java:137)
                                                                             at android.app.ActivityThread.main(ActivityThread.java:4745)
                                                                             at java.lang.reflect.Method.invokeNative(Native Method)
                                                                             at java.lang.reflect.Method.invoke(Method.java:511)
                                                                             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
                                                                             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
                                                                             at dalvik.system.NativeStart.main(Native Method)

Answer 1

试试这个：

final Ingredient item = values_ing.get((int)id);
list_ing.post(new Runnable() {
    @Override
    public void run() {
        values_ing.remove(item);
        adapter_ing.notifyDataSetChanged();
    }
});
list_ch.post(new Runnable() {
    @Override
    public void run() {
        values_ch.add(item);
        adapter_ch.notifyDataSetChanged();
    }
});

ConcurrentModificationException，当在其onItemClick中更改ListView的适配器时

1 个答案: