E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.paullemesnager.flashbac, PID: 4665
java.lang.NoClassDefFoundError: com.paullemesnager.flashbac.CustomArrayAdapter
at com.paullemesnager.flashbac.SelectAssocActivity.onCreate(SelectAssocActivity.java:64)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
at android.app.ActivityThread.access$800(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5373)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
我无法理解为什么会收到此错误以及如何解决此错误，有人可以帮助我吗？
编辑：CustomArrayAdapter的代码与here相同，但我更改了一个类：
private class ArrayFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (mOriginalValues == null) {
synchronized (mLock) {
mOriginalValues = new ArrayList<T>(mObjects);
}
}
if (prefix == null || prefix.length() == 0) {
ArrayList<T> list;
synchronized (mLock) {
list = new ArrayList<T>(mOriginalValues);
}
results.values = list;
results.count = list.size();
} else {
String prefixString = prefix.toString().toLowerCase();
ArrayList<T> values;
synchronized (mLock) {
values = new ArrayList<T>(mOriginalValues);
}
final int count = values.size();
final ArrayList<T> newValues = new ArrayList<T>();
for (int i = 0; i < count; i++) {
final T value = values.get(i);
final String valueText = value.toString().toLowerCase();
// First match against the whole, non-splitted value
if (valueText.startsWith(prefixString)) {
newValues.add(value);
} else {
final String[] words = valueText.split(" ");
final int wordCount = words.length;
// Start at index 0, in case valueText starts with space(s)
for (int k = 0; k < wordCount; k++) {
if (words[k].startsWith(prefixString)) {
newValues.add(value);
break;
}
}
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
//noinspection unchecked
mObjects = (List<T>) results.values;
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
编辑2：这里要求我如何创建CustomArrayAdapter对象：
public class SelectAssocActivity extends AppCompatActivity {
private CustomArrayAdapter<String> adapterA;
.
.
.
lv = (ListView) findViewById(R.id.lvAssoc);
textView = (AutoCompleteTextView) findViewById(R.id.editTextAssoc);
adapterA = new CustomArrayAdapter<>(this, android.R.layout.simple_list_item_1, associations);
lv.setAdapter(adapterA);
CustomArrayAdapter.java：
package com.paullemesnager.flashbac;
import android.content.Context;
import android.content.res.Resources;
import android.util.Log;
import android.view.ContextThemeWrapper;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import android.widget.ThemedSpinnerAdapter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class CustomArrayAdapter<T> extends BaseAdapter implements Filterable, ThemedSpinnerAdapter {
/**
* Lock used to modify the content of {@link #mObjects}. Any write operation
* performed on the array should be synchronized on this lock. This lock is also
* used by the filter (see {@link #getFilter()} to make a synchronized copy of
* the original array of data.
*/
private final Object mLock = new Object();
private final LayoutInflater mInflater;
/**
* Contains the list of objects that represent the data of this CustomArrayAdapter.
* The content of this list is referred to as "the array" in the documentation.
*/
private List<T> mObjects;
/**
* The resource indicating what views to inflate to display the content of this
* array adapter.
*/
private int mResource;
/**
* The resource indicating what views to inflate to display the content of this
* array adapter in a drop down widget.
*/
private int mDropDownResource;
/**
* If the inflated resource is not a TextView, {@link #mFieldId} is used to find
* a TextView inside the inflated views hierarchy. This field must contain the
* identifier that matches the one defined in the resource file.
*/
private int mFieldId = 0;
/**
* Indicates whether or not {@link #notifyDataSetChanged()} must be called whenever
* {@link #mObjects} is modified.
*/
private boolean mNotifyOnChange = true;
private Context mContext;
// A copy of the original mObjects array, initialized from and then used instead as soon as
// the mFilter ArrayFilter is used. mObjects will then only contain the filtered values.
private ArrayList<T> mOriginalValues;
private ArrayFilter mFilter;
/** Layout inflater used for {@link #getDropDownView(int, View, ViewGroup)}. */
private LayoutInflater mDropDownInflater;
/**
* Constructor
*
* @param context The current context.
* @param resource The resource ID for a layout file containing a TextView to use when
* instantiating views.
*/
public CustomArrayAdapter(Context context, int resource) {
this(context, resource, 0, new ArrayList<T>());
}
/**
* Constructor
*
* @param context The current context.
* @param resource The resource ID for a layout file containing a layout to use when
* instantiating views.
* @param textViewResourceId The id of the TextView within the layout resource to be populated
*/
public CustomArrayAdapter(Context context, int resource, int textViewResourceId) {
this(context, resource, textViewResourceId, new ArrayList<T>());
}
/**
* Constructor
*
* @param context The current context.
* @param resource The resource ID for a layout file containing a TextView to use when
* instantiating views.
* @param objects The objects to represent in the ListView.
*/
public CustomArrayAdapter(Context context, int resource, T[] objects) {
this(context, resource, 0, Arrays.asList(objects));
}
/**
* Constructor
*
* @param context The current context.
* @param resource The resource ID for a layout file containing a layout to use when
* instantiating views.
* @param textViewResourceId The id of the TextView within the layout resource to be populated
* @param objects The objects to represent in the ListView.
*/
public CustomArrayAdapter(Context context, int resource, int textViewResourceId,
T[] objects) {
this(context, resource, textViewResourceId, Arrays.asList(objects));
}
/**
* Constructor
*
* @param context The current context.
* @param resource The resource ID for a layout file containing a TextView to use when
* instantiating views.
* @param objects The objects to represent in the ListView.
*/
public CustomArrayAdapter(Context context, int resource, List<T> objects) {
this(context, resource, 0, objects);
}
/**
* Constructor
*
* @param context The current context.
* @param resource The resource ID for a layout file containing a layout to use when
* instantiating views.
* @param textViewResourceId The id of the TextView within the layout resource to be populated
* @param objects The objects to represent in the ListView.
*/
public CustomArrayAdapter(Context context, int resource, int textViewResourceId,
List<T> objects) {
mContext = context;
mInflater = LayoutInflater.from(context);
mResource = mDropDownResource = resource;
mObjects = objects;
mFieldId = textViewResourceId;
}
/**
* Adds the specified object at the end of the array.
*
* @param object The object to add at the end of the array.
*/
public void add(T object) {
synchronized (mLock) {
if (mOriginalValues != null) {
mOriginalValues.add(object);
} else {
mObjects.add(object);
}
}
if (mNotifyOnChange) notifyDataSetChanged();
}
/**
* Adds the specified Collection at the end of the array.
*
* @param collection The Collection to add at the end of the array.
*/
public void addAll(Collection<? extends T> collection) {
synchronized (mLock) {
if (mOriginalValues != null) {
mOriginalValues.addAll(collection);
} else {
mObjects.addAll(collection);
}
}
if (mNotifyOnChange) notifyDataSetChanged();
}
/**
* Adds the specified items at the end of the array.
*
* @param items The items to add at the end of the array.
*/
public void addAll(T ... items) {
synchronized (mLock) {
if (mOriginalValues != null) {
Collections.addAll(mOriginalValues, items);
} else {
Collections.addAll(mObjects, items);
}
}
if (mNotifyOnChange) notifyDataSetChanged();
}
/**
* Inserts the specified object at the specified index in the array.
*
* @param object The object to insert into the array.
* @param index The index at which the object must be inserted.
*/
public void insert(T object, int index) {
synchronized (mLock) {
if (mOriginalValues != null) {
mOriginalValues.add(index, object);
} else {
mObjects.add(index, object);
}
}
if (mNotifyOnChange) notifyDataSetChanged();
}
/**
* Removes the specified object from the array.
*
* @param object The object to remove.
*/
public void remove(T object) {
synchronized (mLock) {
if (mOriginalValues != null) {
mOriginalValues.remove(object);
} else {
mObjects.remove(object);
}
}
if (mNotifyOnChange) notifyDataSetChanged();
}
/**
* Remove all elements from the list.
*/
public void clear() {
synchronized (mLock) {
if (mOriginalValues != null) {
mOriginalValues.clear();
} else {
mObjects.clear();
}
}
if (mNotifyOnChange) notifyDataSetChanged();
}
/**
* Sorts the content of this adapter using the specified comparator.
*
* @param comparator The comparator used to sort the objects contained
* in this adapter.
*/
public void sort(Comparator<? super T> comparator) {
synchronized (mLock) {
if (mOriginalValues != null) {
Collections.sort(mOriginalValues, comparator);
} else {
Collections.sort(mObjects, comparator);
}
}
if (mNotifyOnChange) notifyDataSetChanged();
}
/**
* {@inheritDoc}
*/
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
mNotifyOnChange = true;
}
/**
* Control whether methods that change the list ({@link #add},
* {@link #insert}, {@link #remove}, {@link #clear}) automatically call
* {@link #notifyDataSetChanged}. If set to false, caller must
* manually call notifyDataSetChanged() to have the changes
* reflected in the attached view.
*
* The default is true, and calling notifyDataSetChanged()
* resets the flag to true.
*
* @param notifyOnChange if true, modifications to the list will
* automatically call {@link
* #notifyDataSetChanged}
*/
public void setNotifyOnChange(boolean notifyOnChange) {
mNotifyOnChange = notifyOnChange;
}
/**
* Returns the context associated with this array adapter. The context is used
* to create views from the resource passed to the constructor.
*
* @return The Context associated with this adapter.
*/
public Context getContext() {
return mContext;
}
/**
* {@inheritDoc}
*/
public int getCount() {
return mObjects.size();
}
/**
* {@inheritDoc}
*/
public T getItem(int position) {
return mObjects.get(position);
}
/**
* Returns the position of the specified item in the array.
*
* @param item The item to retrieve the position of.
*
* @return The position of the specified item.
*/
public int getPosition(T item) {
return mObjects.indexOf(item);
}
/**
* {@inheritDoc}
*/
public long getItemId(int position) {
return position;
}
/**
* {@inheritDoc}
*/
public View getView(int position, View convertView, ViewGroup parent) {
return createViewFromResource(mInflater, position, convertView, parent, mResource);
}
private View createViewFromResource(LayoutInflater inflater, int position, View convertView,
ViewGroup parent, int resource) {
View view;
TextView text;
if (convertView == null) {
view = inflater.inflate(resource, parent, false);
} else {
view = convertView;
}
try {
if (mFieldId == 0) {
// If no custom field is assigned, assume the whole resource is a TextView
text = (TextView) view;
} else {
// Otherwise, find the TextView field within the layout
text = (TextView) view.findViewById(mFieldId);
}
} catch (ClassCastException e) {
Log.e("CustomArrayAdapter", "You must supply a resource ID for a TextView");
throw new IllegalStateException(
"CustomArrayAdapter requires the resource ID to be a TextView", e);
}
T item = getItem(position);
if (item instanceof CharSequence) {
text.setText((CharSequence)item);
} else {
text.setText(item.toString());
}
return view;
}
/**
* <p>Sets the layout resource to create the drop down views.</p>
*
* @param resource the layout resource defining the drop down views
* @see #getDropDownView(int, android.view.View, android.view.ViewGroup)
*/
public void setDropDownViewResource(int resource) {
this.mDropDownResource = resource;
}
/**
* Sets the {@link Resources.Theme} against which drop-down views are
* inflated.
* <p>
* By default, drop-down views are inflated against the theme of the
* {@link Context} passed to the adapter's constructor.
*
* @param theme the theme against which to inflate drop-down views or
* {@code null} to use the theme from the adapter's context
* @see #getDropDownView(int, View, ViewGroup)
*/
@Override
public void setDropDownViewTheme(Resources.Theme theme) {
if (theme == null) {
mDropDownInflater = null;
} else if (theme == mInflater.getContext().getTheme()) {
mDropDownInflater = mInflater;
} else {
final Context context = new ContextThemeWrapper(mContext, theme);
mDropDownInflater = LayoutInflater.from(context);
}
}
@Override
public Resources.Theme getDropDownViewTheme() {
return mDropDownInflater == null ? null : mDropDownInflater.getContext().getTheme();
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
final LayoutInflater inflater = mDropDownInflater == null ? mInflater : mDropDownInflater;
return createViewFromResource(inflater, position, convertView, parent, mDropDownResource);
}
/**
* Creates a new CustomArrayAdapter from external resources. The content of the array is
* obtained through {@link android.content.res.Resources#getTextArray(int)}.
*
* @param context The application's environment.
* @param textArrayResId The identifier of the array to use as the data source.
* @param textViewResId The identifier of the layout used to create views.
*
* @return An CustomArrayAdapter<CharSequence>.
*/
public static CustomArrayAdapter<CharSequence> createFromResource(Context context,
int textArrayResId, int textViewResId) {
CharSequence[] strings = context.getResources().getTextArray(textArrayResId);
return new CustomArrayAdapter<CharSequence>(context, textViewResId, strings);
}
/**
* {@inheritDoc}
*/
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ArrayFilter();
}
return mFilter;
}
/**
* <p>An array filter constrains the content of the array adapter with
* a prefix. Each item that does not start with the supplied prefix
* is removed from the list.</p>
*/
private class ArrayFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (mOriginalValues == null) {
synchronized (mLock) {
mOriginalValues = new ArrayList<T>(mObjects);
}
}
if (prefix == null || prefix.length() == 0) {
ArrayList<T> list;
synchronized (mLock) {
list = new ArrayList<T>(mOriginalValues);
}
results.values = list;
results.count = list.size();
} else {
String prefixString = prefix.toString().toLowerCase();
ArrayList<T> values;
synchronized (mLock) {
values = new ArrayList<T>(mOriginalValues);
}
final int count = values.size();
final ArrayList<T> newValues = new ArrayList<T>();
for (int i = 0; i < count; i++) {
final T value = values.get(i);
final String valueText = value.toString().toLowerCase();
// First match against the whole, non-splitted value
if (valueText.startsWith(prefixString)) {
newValues.add(value);
} else {
final String[] words = valueText.split(" ");
final int wordCount = words.length;
// Start at index 0, in case valueText starts with space(s)
for (int k = 0; k < wordCount; k++) {
if (words[k].startsWith(prefixString)) {
newValues.add(value);
break;
}
}
}
if (valueText.startsWith(prefixString) || valueText.contains(prefixString)) {
newValues.add(value);
} else {
final String[] words = valueText.split(" ");
final int wordCount = words.length;
// Start at index 0, in case valueText starts with space(s)
for (int k = 0; k < wordCount; k++) {
if (words[k].startsWith(prefixString) || words[k].contains(prefixString)) {
newValues.add(value);
break;
}
}
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
//noinspection unchecked
mObjects = (List<T>) results.values;
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
}
2个文件的路径：
app\src\main\java\com\paullemesnager\flashbac\CustomArrayAdapter.java
app\src\main\java\com\paullemesnager\flashbac\SelectAssocActivity.java
答案 0 :(得分：0)
javadoc是非常自我解释的
https://docs.oracle.com/javase/7/docs/api/java/lang/NoClassDefFoundError.html
如果Java虚拟机或ClassLoader实例尝试，则抛出该异常 加载类的定义（作为普通方法调用的一部分或 作为使用新表达式创建新实例的一部分）和否 可以找到类的定义。搜索过的课程 编译当前正在执行的类时存在定义， 但无法再找到定义。
通常，它意味着在运行时jar中包含缺少CustomArrayAdapter的类
答案 1 :(得分：0)
正如您在日志中看到的那样，错误发生在：
java.lang.NoClassDefFoundError: com.paullemesnager.flashbac.CustomArrayAdapter
com.paullemesnager.flashbac.SelectAssocActivity.onCreate(SelectAssocActivity.java:64)
...
所以，你必须打开SelectAssocActivity.java，找到第64行并检查你在那里写的是什么。
您似乎尝试创建一些CustomArrayAdapter类型的对象。但是，该类不存在（NoClassDefFoundError）。
我查看了您发布的链接。该班级的名称为ArrayAdapter而非CustomArrayAdapter。
public class ArrayAdapter<T> extends BaseAdapter implements Filterable, ThemedSpinnerAdapter {
...
}
因此，检查SelectAssocActivity.java，第64行，如果将对象类型从CustomArrayAdapter更改为ArrayAdapter。