java.lang.ClassCastException:android.widget.LinearLayout无法使用ArrayAdapter强制转换为android.widget.TextView

我正在做在安卓设备上开发的学期项目。 问题是我试图将一个对象添加到ArrayAdapter中。 但它得到了一个错误

11-29 11:58:07.136: D/dalvikvm(1262): GC_FOR_ALLOC freed 136K, 8% free 2677K/2880K, paused 30ms, total 32ms

11-29 11:58:07.415: E/ArrayAdapter(1262): You must supply a resource ID for a TextView

11-29 11:58:07.415: D/AndroidRuntime(1262): Shutting down VM

11-29 11:58:07.415: W/dalvikvm(1262): threadid=1: thread exiting with uncaught exception (group=0x41465700)

11-29 11:58:07.465: E/AndroidRuntime(1262): FATAL EXCEPTION: main

11-29 11:58:07.465: E/AndroidRuntime(1262): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.AbsListView.obtainView(AbsListView.java:2177)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.ListView.makeAndAddView(ListView.java:1840)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.ListView.fillDown(ListView.java:675)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.ListView.fillFromTop(ListView.java:736)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.ListView.layoutChildren(ListView.java:1655)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.AbsListView.onLayout(AbsListView.java:2012)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.View.layout(View.java:14289)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewGroup.layout(ViewGroup.java:4562)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.View.layout(View.java:14289)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewGroup.layout(ViewGroup.java:4562)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.FrameLayout.onLayout(FrameLayout.java:448)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.View.layout(View.java:14289)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewGroup.layout(ViewGroup.java:4562)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:349)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.View.layout(View.java:14289)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewGroup.layout(ViewGroup.java:4562)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.FrameLayout.onLayout(FrameLayout.java:448)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.View.layout(View.java:14289)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewGroup.layout(ViewGroup.java:4562)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1976)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1730)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.Choreographer.doCallbacks(Choreographer.java:562)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.Choreographer.doFrame(Choreographer.java:532)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.os.Handler.handleCallback(Handler.java:730)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.os.Handler.dispatchMessage(Handler.java:92)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.os.Looper.loop(Looper.java:137)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.app.ActivityThread.main(ActivityThread.java:5103)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at java.lang.reflect.Method.invokeNative(Native Method)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at java.lang.reflect.Method.invoke(Method.java:525)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

11-29 11:58:07.465: E/AndroidRuntime(1262):     at dalvik.system.NativeStart.main(Native Method)

11-29 11:58:07.465: E/AndroidRuntime(1262): Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView

11-29 11:58:07.465: E/AndroidRuntime(1262):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:379)

11-29 11:58:07.465: E/AndroidRuntime(1262):     ... 40 more

这是我的主要活动-onCreate方法。

private EditText createTaskText;
ArrayAdapter<Task> listAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); // To change body of overridden
                                        // methods use File | Settings |
                                        // File Templates.
    setContentView(R.layout.main);

    // !!! Add quick create task !!!
    createTaskText = (EditText) findViewById(R.id.quickTopic);
    TextView.OnEditorActionListener exListener = new TextView.OnEditorActionListener() {

        @Override
        public boolean onEditorAction(TextView v, int actionId,
                KeyEvent event) {
            if (actionId == EditorInfo.IME_NULL
                    && event.getAction() == KeyEvent.ACTION_DOWN
                    && !createTaskText.getText().toString().equals("")) {
                // setContentView(R.layout.edit_task_page);
                Intent goTaskEdit = new Intent(ExpandAnimationDemo.this,
                        TaskEdit.class);
                goTaskEdit.putExtra("Topic", createTaskText.getText()
                        .toString());
                startActivity(goTaskEdit);
                createTaskText.setText("");
            }
            return false;
        }
    };
    createTaskText.setOnEditorActionListener(exListener);


    // Creating list, initially = 0 list
    ListView list = (ListView) findViewById(R.id.udiniList);

    Task[] items = {
            new Task("Task 1"),
            new Task("Task 2"),
            new Task("Task 3"),
            new Task("Task 4"),
            new Task("Task 5"),
            };
    // Creating the list adapter and populating the list
    listAdapter = new ArrayAdapter<Task>(this,
            R.layout.list_item, items);
    list.setAdapter(listAdapter);


    // Creating an item click listener, to open/close our toolbar for each
    // item
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, final View view,
                int position, long id) {

            View toolbar = view.findViewById(R.id.toolbar);

            // Creating the expand animation for the item
            ExpandAnimation expandAni = new ExpandAnimation(toolbar, 500);

            // Start the animation on the toolbar
            toolbar.startAnimation(expandAni);

        }
    });

    // !!! Set Swipe to Dismiss !!!
    // Create a ListView-specific touch listener. ListViews are given special treatment because
    // by default they handle touches for their list items... i.e. they're in charge of drawing
    // the pressed state (the list selector), handling list item clicks, etc.
    SwipeDismissListViewTouchListener touchListener =
            new SwipeDismissListViewTouchListener(
                    list,
                    new SwipeDismissListViewTouchListener.DismissCallbacks() {
                        @Override
                        public boolean canDismiss(int position) {
                            return true;
                        }

                        @Override
                        public void onDismiss(ListView listView, int[] reverseSortedPositions) {
                            for (int position : reverseSortedPositions) {
                                listAdapter.remove(listAdapter.getItem(position));
                            }
                            listAdapter.notifyDataSetChanged();
                        }
                    });
    list.setOnTouchListener(touchListener);
    // Setting this scroll listener is required to ensure that during ListView scrolling,
    // we don't look for swipes.
    list.setOnScrollListener(touchListener.makeScrollListener());

}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<EditText
    android:id="@+id/quickTopic"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="30dp"
    android:layout_marginRight="30dp"
    android:layout_marginTop="10dp"
    android:hint="@string/quickTaskTopic"
    android:inputType="text" />

<ListView
    android:id="@+id/udiniList"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:divider="@android:color/transparent"
    android:dividerHeight="10.0sp" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:padding="20dip" />

    <ImageView
        android:id="@+id/editPic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp"
        android:layout_marginTop="20dp"
        android:layout_toLeftOf="@+id/deletePic"
        android:contentDescription="@string/EditDesc"
        android:src="@drawable/pencil" />

    <ImageView
        android:id="@+id/deletePic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        android:contentDescription="@string/DeleteDesc"
        android:src="@drawable/delete" />
</RelativeLayout>

<!-- *********************** -->
<!-- *** TOOLBAR LAYOUT **** -->
<!-- *********************** -->

<LinearLayout
    android:id="@+id/toolbar"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="-20dip"
    android:orientation="vertical"
    android:visibility="gone" >

    <!-- TextView will showing task details.The details must get from user database -->

    <TextView
        android:id="@+id/taskDetail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:padding="20dp"
        android:paddingLeft="50dp"
        android:singleLine="false"
        android:text="@string/Details" />

    <!-- This RelativeLayout manage the TextView which represent the information of Priority, DueDate, and Tag s-->

    <RelativeLayout
        android:id="@+id/taskSpec"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false" >

        <!-- TextView of "Priority" and priority value -->

        <TextView
            android:id="@+id/PriorityStr"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/Priority" />

        <TextView
            android:id="@+id/PriorityGet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/PriorityStr"
            android:padding="20dp"
            android:paddingLeft="55dp"
            android:text="@string/SamplePriority" />

        <!-- TextView of "DueDate" and duedate value -->

        <TextView
            android:id="@+id/DueDateStr"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/PriorityStr"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/DueDate" />

        <TextView
            android:id="@+id/DueDateGet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/PriorityGet"
            android:layout_toRightOf="@+id/DueDateStr"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/SampleDueDate" />

        <!-- TextView of "Tags" and tags value -->

        <TextView
            android:id="@+id/TagsStr"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/DueDateStr"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/Tags" />

        <TextView
            android:id="@+id/TagGet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/DueDateGet"
            android:layout_toRightOf="@+id/TagsStr"
            android:padding="20dp"
            android:paddingLeft="60dp"
            android:text="@string/SampleTags" />
    </RelativeLayout>
</LinearLayout>

</LinearLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<EditText
    android:id="@+id/quickTopic"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="30dp"
    android:layout_marginRight="30dp"
    android:layout_marginTop="10dp"
    android:hint="@string/quickTaskTopic"
    android:inputType="text" />

<ListView
    android:id="@+id/udiniList"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:divider="@android:color/transparent"
    android:dividerHeight="10.0sp" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:padding="20dip" />

    <ImageView
        android:id="@+id/editPic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp"
        android:layout_marginTop="20dp"
        android:layout_toLeftOf="@+id/deletePic"
        android:contentDescription="@string/EditDesc"
        android:src="@drawable/pencil" />

    <ImageView
        android:id="@+id/deletePic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        android:contentDescription="@string/DeleteDesc"
        android:src="@drawable/delete" />
</RelativeLayout>

<!-- *********************** -->
<!-- *** TOOLBAR LAYOUT **** -->
<!-- *********************** -->

<LinearLayout
    android:id="@+id/toolbar"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="-20dip"
    android:orientation="vertical"
    android:visibility="gone" >

    <!-- TextView will showing task details.The details must get from user database -->

    <TextView
        android:id="@+id/taskDetail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:padding="20dp"
        android:paddingLeft="50dp"
        android:singleLine="false"
        android:text="@string/Details" />

    <!-- This RelativeLayout manage the TextView which represent the information of Priority, DueDate, and Tag s-->

    <RelativeLayout
        android:id="@+id/taskSpec"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false" >

        <!-- TextView of "Priority" and priority value -->

        <TextView
            android:id="@+id/PriorityStr"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/Priority" />

        <TextView
            android:id="@+id/PriorityGet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/PriorityStr"
            android:padding="20dp"
            android:paddingLeft="55dp"
            android:text="@string/SamplePriority" />

        <!-- TextView of "DueDate" and duedate value -->

        <TextView
            android:id="@+id/DueDateStr"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/PriorityStr"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/DueDate" />

        <TextView
            android:id="@+id/DueDateGet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/PriorityGet"
            android:layout_toRightOf="@+id/DueDateStr"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/SampleDueDate" />

        <!-- TextView of "Tags" and tags value -->

        <TextView
            android:id="@+id/TagsStr"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/DueDateStr"
            android:padding="20dp"
            android:paddingLeft="50dp"
            android:text="@string/Tags" />

        <TextView
            android:id="@+id/TagGet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/DueDateGet"
            android:layout_toRightOf="@+id/TagsStr"
            android:padding="20dp"
            android:paddingLeft="60dp"
            android:text="@string/SampleTags" />
    </RelativeLayout>
</LinearLayout>

</LinearLayout>

---

如何解决此问题？

从错误中可以看出，

ArrayAdapter要求资源ID为TextView

试着改变

listAdapter = new ArrayAdapter<Task>(this, R.layout.list_item, items);

listAdapter=newarrayadapter（此，R.layout.list_项，项）；

为此：

listAdapter = new ArrayAdapter<Task>(this, R.layout.list_item, R.id.TEXT_VIEW_ID, items);

listAdapter=newarrayadapter（这个，R.layout.list\u项，R.id.TEXT\u视图\u id，项）；

---

将布局中的

R.id.TEXT\u VIEW\u id

替换为TextView id

数组适配器在第二个参数中采用xml，该参数应仅包含TextView。您需要实现自己的自定义适配器，因为您的

list\u项

包含大量要在ListView中膨胀的小部件

Android的ArrayAdapter无法做到这一点。您需要通过扩展ArrayAdapter或BaseAdapter来实现自己的功能

11-29 11:58:07.465: E/AndroidRuntime(1262): Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView

出现此错误是因为列表项父窗口小部件是一个

线性布局

，而ArrayAdapter的第二个参数采用

文本视图

xml。例如：

        ArrayAdapter listAdapter = new ArrayAdapter(this,
            android.R.layout.simple_list_item_1 items);

如果在

简单列表项目1

上按住CTRL+

键并单击

，将打开一个xml，如下所示：

    <?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2006 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceListItemSmall"
    android:gravity="center_vertical"
    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
    android:minHeight="?android:attr/listPreferredItemHeightSmall"
/>

如您所见，它是一个单一的文本视图

---

因此，您需要实现自己的自定义适配器。

能否请您共享ExpandAnimation类。正如logcat所说的

ArrayAdapter要求资源ID为TextView

。因此，问题在于

ArrayAdapter

的实例化，而不是您在此处发布的代码。您的解决方案是工作！非常感谢@用户3050141我很高兴这有帮助：）谢谢你的解释和建议。我希望你的评论对其他人也有好处