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/*
* 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.content.Context;
import android.content.res.Resources;
import android.database.Cursor;
import android.view.ContextThemeWrapper;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* An easy adapter that creates views defined in an XML file. You can specify
* the XML file that defines the appearance of the views.
*/
public abstract class ResourceCursorAdapter extends CursorAdapter {
private int mLayout;
private int mDropDownLayout;
private LayoutInflater mInflater;
private LayoutInflater mDropDownInflater;
/**
* Constructor the enables auto-requery.
*
* @deprecated This option is discouraged, as it results in Cursor queries
* being performed on the application's UI thread and thus can cause poor
* responsiveness or even Application Not Responding errors. As an alternative,
* use {@link android.app.LoaderManager} with a {@link android.content.CursorLoader}.
*
* @param context The context where the ListView associated with this adapter is running
* @param layout resource identifier of a layout file that defines the views
* for this list item. Unless you override them later, this will
* define both the item views and the drop down views.
*/
@Deprecated
public ResourceCursorAdapter(Context context, int layout, Cursor c) {
super(context, c);
mLayout = mDropDownLayout = layout;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mDropDownInflater = mInflater;
}
/**
* Constructor with default behavior as per
* {@link CursorAdapter#CursorAdapter(Context, Cursor, boolean)}; it is recommended
* you not use this, but instead {@link #ResourceCursorAdapter(Context, int, Cursor, int)}.
* When using this constructor, {@link #FLAG_REGISTER_CONTENT_OBSERVER}
* will always be set.
*
* @param context The context where the ListView associated with this adapter is running
* @param layout resource identifier of a layout file that defines the views
* for this list item. Unless you override them later, this will
* define both the item views and the drop down views.
* @param c The cursor from which to get the data.
* @param autoRequery If true the adapter will call requery() on the
* cursor whenever it changes so the most recent
* data is always displayed. Using true here is discouraged.
*/
public ResourceCursorAdapter(Context context, int layout, Cursor c, boolean autoRequery) {
super(context, c, autoRequery);
mLayout = mDropDownLayout = layout;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mDropDownInflater = mInflater;
}
/**
* Standard constructor.
*
* @param context The context where the ListView associated with this adapter is running
* @param layout Resource identifier of a layout file that defines the views
* for this list item. Unless you override them later, this will
* define both the item views and the drop down views.
* @param c The cursor from which to get the data.
* @param flags Flags used to determine the behavior of the adapter,
* as per {@link CursorAdapter#CursorAdapter(Context, Cursor, int)}.
*/
public ResourceCursorAdapter(Context context, int layout, Cursor c, int flags) {
super(context, c, flags);
mLayout = mDropDownLayout = layout;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mDropDownInflater = mInflater;
}
/**
* Sets the {@link android.content.res.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 #newDropDownView(Context, Cursor, ViewGroup)
*/
@Override
public void setDropDownViewTheme(Resources.Theme theme) {
super.setDropDownViewTheme(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);
}
}
/**
* Inflates view(s) from the specified XML file.
*
* @see android.widget.CursorAdapter#newView(android.content.Context,
* android.database.Cursor, ViewGroup)
*/
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return mInflater.inflate(mLayout, parent, false);
}
@Override
public View newDropDownView(Context context, Cursor cursor, ViewGroup parent) {
return mDropDownInflater.inflate(mDropDownLayout, parent, false);
}
/**
* <p>Sets the layout resource of the item views.</p>
*
* @param layout the layout resources used to create item views
*/
public void setViewResource(int layout) {
mLayout = layout;
}
/**
* <p>Sets the layout resource of the drop down views.</p>
*
* @param dropDownLayout the layout resources used to create drop down views
*/
public void setDropDownViewResource(int dropDownLayout) {
mDropDownLayout = dropDownLayout;
}
}
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