java.lang.ClassCastException：android.widget.LinearLayout不能转换使用ArrayAdapter android.widget.TextView到 [英] java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView using ArrayAdapter
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问题描述
我正在上Android设备上开发了我的长期项目。
问题是我尝试对象添加到我的ArrayAdapter。
但它得到一个错误。
I'm working on my term project which developed on Android device. The problem is I try to add an object into my ArrayAdapter. But it gets an errors.
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MainActivity - onCreate方法
This is my MainActivity - onCreate method.
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());
}
我的Task类
public class Task extends HistoryTask {
int priority;
Calendar duedate;
//------------------------------
// constructors
public Task() {
duedate = Calendar.getInstance();
}
public Task( String t ) {
super( t );
duedate = Calendar.getInstance();
}
public Task( String t, String d ) {
super( t, d );
duedate = Calendar.getInstance();
}
public Task( String t, String d, int tg ) {
super( t, d, tg );
duedate = Calendar.getInstance();
}
public Task( String t, String d, int tg, int p ) {
super( t, d, tg );
priority = p;
duedate = Calendar.getInstance();
}
public Task( String t, String d, int tg, int p, Calendar dd ) {
super( t, d, tg );
priority = p;
duedate = dd;
}
@Override
public String toString() {
return super.toString();
}
}
的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>
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" >
<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>
我该如何解决这个问题呢？
How can I solve this problem?
推荐答案
从错误它说， ArrayAdapter需要的资源ID是一个TextView
尝试更改
listAdapter = new ArrayAdapter<Task>(this, R.layout.list_item, items);
这样：
listAdapter = new ArrayAdapter<Task>(this, R.layout.list_item, R.id.TEXT_VIEW_ID, items);
替换 R.id.TEXT_VIEW_ID 与布局TextView的ID
Replace R.id.TEXT_VIEW_ID with the TextView id in your layout
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