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add android.widget.Adapter and related classes from AOSP

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This commit is contained in:
Julian Winkler
2023-09-01 12:25:19 +02:00
parent 295d9dfda3
commit e522200e28
6 changed files with 749 additions and 0 deletions
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147
src/api-impl/android/widget/Adapter.java Normal file
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/*
* 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.
*/
package android.widget;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
/**
* An Adapter object acts as a bridge between an {@link AdapterView} and the
* underlying data for that view. The Adapter provides access to the data items.
* The Adapter is also responsible for making a {@link android.view.View} for
* each item in the data set.
*
* @see android.widget.ArrayAdapter
* @see android.widget.CursorAdapter
* @see android.widget.SimpleCursorAdapter
*/
public interface Adapter {
/**
* Register an observer that is called when changes happen to the data used by this adapter.
*
* @param observer the object that gets notified when the data set changes.
*/
void registerDataSetObserver(DataSetObserver observer);
/**
* Unregister an observer that has previously been registered with this
* adapter via {@link #registerDataSetObserver}.
*
* @param observer the object to unregister.
*/
void unregisterDataSetObserver(DataSetObserver observer);
/**
* How many items are in the data set represented by this Adapter.
*
* @return Count of items.
*/
int getCount();
/**
* Get the data item associated with the specified position in the data set.
*
* @param position Position of the item whose data we want within the adapter's
* data set.
* @return The data at the specified position.
*/
Object getItem(int position);
/**
* Get the row id associated with the specified position in the list.
*
* @param position The position of the item within the adapter's data set whose row id we want.
* @return The id of the item at the specified position.
*/
long getItemId(int position);
/**
* Indicates whether the item ids are stable across changes to the
* underlying data.
*
* @return True if the same id always refers to the same object.
*/
boolean hasStableIds();
/**
* Get a View that displays the data at the specified position in the data set. You can either
* create a View manually or inflate it from an XML layout file. When the View is inflated, the
* parent View (GridView, ListView...) will apply default layout parameters unless you use
* {@link android.view.LayoutInflater#inflate(int, android.view.ViewGroup, boolean)}
* to specify a root view and to prevent attachment to the root.
*
* @param position The position of the item within the adapter's data set of the item whose view
* we want.
* @param convertView The old view to reuse, if possible. Note: You should check that this view
* is non-null and of an appropriate type before using. If it is not possible to convert
* this view to display the correct data, this method can create a new view.
* Heterogeneous lists can specify their number of view types, so that this View is
* always of the right type (see {@link #getViewTypeCount()} and
* {@link #getItemViewType(int)}).
* @param parent The parent that this view will eventually be attached to
* @return A View corresponding to the data at the specified position.
*/
View getView(int position, View convertView, ViewGroup parent);
/**
* An item view type that causes the {@link AdapterView} to ignore the item
* view. For example, this can be used if the client does not want a
* particular view to be given for conversion in
* {@link #getView(int, View, ViewGroup)}.
*
* @see #getItemViewType(int)
* @see #getViewTypeCount()
*/
static final int IGNORE_ITEM_VIEW_TYPE = /*AdapterView.ITEM_VIEW_TYPE_IGNORE*/ -1;
/**
* Get the type of View that will be created by {@link #getView} for the specified item.
*
* @param position The position of the item within the adapter's data set whose view type we
* want.
* @return An integer representing the type of View. Two views should share the same type if one
* can be converted to the other in {@link #getView}. Note: Integers must be in the
* range 0 to {@link #getViewTypeCount} - 1. {@link #IGNORE_ITEM_VIEW_TYPE} can
* also be returned.
* @see #IGNORE_ITEM_VIEW_TYPE
*/
int getItemViewType(int position);
/**
* <p>
* Returns the number of types of Views that will be created by
* {@link #getView}. Each type represents a set of views that can be
* converted in {@link #getView}. If the adapter always returns the same
* type of View for all items, this method should return 1.
* </p>
* <p>
* This method will only be called when when the adapter is set on the
* the {@link AdapterView}.
* </p>
*
* @return The number of types of Views that will be created by this adapter
*/
int getViewTypeCount();
static final int NO_SELECTION = Integer.MIN_VALUE;
/**
* @return true if this adapter doesn't contain any data. This is used to determine
* whether the empty view should be displayed. A typical implementation will return
* getCount() == 0 but since getCount() includes the headers and footers, specialized
* adapters might want a different behavior.
*/
boolean isEmpty();
}

466
src/api-impl/android/widget/ArrayAdapter.java Normal file
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/*
* 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.
*/
package android.widget;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* A concrete BaseAdapter that is backed by an array of arbitrary
* objects. By default this class expects that the provided resource id references
* a single TextView. If you want to use a more complex layout, use the constructors that
* also takes a field id. That field id should reference a TextView in the larger layout
* resource.
*
* <p>However the TextView is referenced, it will be filled with the toString() of each object in
* the array. You can add lists or arrays of custom objects. Override the toString() method
* of your objects to determine what text will be displayed for the item in the list.
*
* <p>To use something other than TextViews for the array display, for instance, ImageViews,
* or to have some of data besides toString() results fill the views,
* override {@link #getView(int, View, ViewGroup)} to return the type of view you want.
*/
public class ArrayAdapter<T> extends BaseAdapter /*implements Filterable*/ {
/**
* Contains the list of objects that represent the data of this ArrayAdapter.
* The content of this list is referred to as "the array" in the documentation.
*/
private List<T> mObjects;
/**
* 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();
/**
* 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;
private LayoutInflater mInflater;
/**
* Constructor
*
* @param context The current context.
* @param textViewResourceId The resource ID for a layout file containing a TextView to use when
* instantiating views.
*/
public ArrayAdapter(Context context, int textViewResourceId) {
init(context, textViewResourceId, 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 ArrayAdapter(Context context, int resource, int textViewResourceId) {
init(context, resource, textViewResourceId, new ArrayList<T>());
}
/**
* Constructor
*
* @param context The current context.
* @param textViewResourceId 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 ArrayAdapter(Context context, int textViewResourceId, T[] objects) {
init(context, textViewResourceId, 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 ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects) {
init(context, resource, textViewResourceId, Arrays.asList(objects));
}
/**
* Constructor
*
* @param context The current context.
* @param textViewResourceId 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 ArrayAdapter(Context context, int textViewResourceId, List<T> objects) {
init(context, textViewResourceId, 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 ArrayAdapter(Context context, int resource, int textViewResourceId, List<T> objects) {
init(context, resource, textViewResourceId, objects);
}
/**
* 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;
}
private void init(Context context, int resource, int textViewResourceId, List<T> objects) {
mContext = context;
mInflater = new LayoutInflater();
mResource = mDropDownResource = resource;
mObjects = objects;
mFieldId = textViewResourceId;
}
/**
* 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(position, convertView, parent, mResource);
}
private View createViewFromResource(int position, View convertView, ViewGroup parent,
int resource) {
View view;
TextView text;
if (convertView == null) {
view = mInflater.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("ArrayAdapter", "You must supply a resource ID for a TextView");
throw new IllegalStateException(
"ArrayAdapter 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;
}
/**
* {@inheritDoc}
*/
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
return createViewFromResource(position, convertView, parent, mDropDownResource);
}
/**
* Creates a new ArrayAdapter 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 ArrayAdapter<CharSequence>.
*/
public static ArrayAdapter<CharSequence> createFromResource(Context context,
int textArrayResId, int textViewResId) {
CharSequence[] strings = context.getResources().getTextArray(textArrayResId);
return new ArrayAdapter<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;
}
}
}
}
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();
}
}
}
}

79
src/api-impl/android/widget/BaseAdapter.java Normal file
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@@ -0,0 +1,79 @@
/*
* Copyright (C) 2007 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.
*/
package android.widget;
import android.database.DataSetObservable;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
/**
* Common base class of common implementation for an {@link Adapter} that can be
* used in both {@link ListView} (by implementing the specialized
* {@link ListAdapter} interface} and {@link Spinner} (by implementing the
* specialized {@link SpinnerAdapter} interface.
*/
public abstract class BaseAdapter implements /*ListAdapter,*/ SpinnerAdapter {
private final DataSetObservable mDataSetObservable = new DataSetObservable();
public boolean hasStableIds() {
return false;
}
public void registerDataSetObserver(DataSetObserver observer) {
mDataSetObservable.registerObserver(observer);
}
public void unregisterDataSetObserver(DataSetObserver observer) {
mDataSetObservable.unregisterObserver(observer);
}
/**
* Notifies the attached observers that the underlying data has been changed
* and any View reflecting the data set should refresh itself.
*/
public void notifyDataSetChanged() {
mDataSetObservable.notifyChanged();
}
/**
* Notifies the attached observers that the underlying data is no longer valid
* or available. Once invoked this adapter is no longer valid and should
* not report further data set changes.
*/
public void notifyDataSetInvalidated() {
mDataSetObservable.notifyInvalidated();
}
public boolean areAllItemsEnabled() {
return true;
}
public boolean isEnabled(int position) {
return true;
}
public View getDropDownView(int position, View convertView, ViewGroup parent) {
return getView(position, convertView, parent);
}
public int getItemViewType(int position) {
return 0;
}
public int getViewTypeCount() {
return 1;
}
public boolean isEmpty() {
return getCount() == 0;
}
}

10
src/api-impl/android/widget/Spinner.java
View File

@@ -14,4 +14,14 @@ public class Spinner extends View {
super(context, attributeSet);
}
public void setAdapter(SpinnerAdapter adapter) {
}
public void setSelection(int i) {
}
public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener listener) {}
public void setSelection(int position, boolean animate) {}
}

43
src/api-impl/android/widget/SpinnerAdapter.java Normal file
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@@ -0,0 +1,43 @@
/*
* Copyright (C) 2007 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.
*/
package android.widget;
import android.view.View;
import android.view.ViewGroup;
/**
* Extended {@link Adapter} that is the bridge between a
* {@link android.widget.Spinner} and its data. A spinner adapter allows to
* define two different views: one that shows the data in the spinner itself and
* one that shows the data in the drop down list when the spinner is pressed.</p>
*/
public interface SpinnerAdapter extends Adapter {
/**
* <p>Get a {@link android.view.View} that displays in the drop down popup
* the data at the specified position in the data set.</p>
*
* @param position index of the item whose view we want.
* @param convertView the old view to reuse, if possible. Note: You should
* check that this view is non-null and of an appropriate type before
* using. If it is not possible to convert this view to display the
* correct data, this method can create a new view.
* @param parent the parent that this view will eventually be attached to
* @return a {@link android.view.View} corresponding to the data at the
* specified position.
*/
public View getDropDownView(int position, View convertView, ViewGroup parent);
}

4
src/api-impl/meson.build
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@@ -329,8 +329,11 @@ hax_jar = jar('hax', [
'android/webkit/WebSettings.java',
'android/webkit/WebView.java',
'android/webkit/WebViewClient.java',
'android/widget/Adapter.java',
'android/widget/AdapterView.java',
'android/widget/ArrayAdapter.java',
'android/widget/AutoCompleteTextView.java',
'android/widget/BaseAdapter.java',
'android/widget/Button.java',
'android/widget/Checkable.java',
'android/widget/CompoundButton.java',
@@ -352,6 +355,7 @@ hax_jar = jar('hax', [
'android/widget/ScrollView.java',
'android/widget/SeekBar.java',
'android/widget/Spinner.java',
'android/widget/SpinnerAdapter.java',
'android/widget/TextView.java',
'com/android/internal/Manifest.java',
'com/android/internal/R.java',