| /* |
| * 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.annotation.IdRes; |
| import android.annotation.LayoutRes; |
| import android.annotation.UnsupportedAppUsage; |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.net.Uri; |
| import android.os.Build; |
| import android.view.ContextThemeWrapper; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * An easy adapter to map static data to views defined in an XML file. You can specify the data |
| * backing the list as an ArrayList of Maps. Each entry in the ArrayList corresponds to one row |
| * in the list. The Maps contain the data for each row. You also specify an XML file that |
| * defines the views used to display the row, and a mapping from keys in the Map to specific |
| * views. |
| * |
| * Binding data to views occurs in two phases. First, if a |
| * {@link android.widget.SimpleAdapter.ViewBinder} is available, |
| * {@link ViewBinder#setViewValue(android.view.View, Object, String)} |
| * is invoked. If the returned value is true, binding has occurred. |
| * If the returned value is false, the following views are then tried in order: |
| * <ul> |
| * <li> A view that implements Checkable (e.g. CheckBox). The expected bind value is a boolean. |
| * <li> TextView. The expected bind value is a string and {@link #setViewText(TextView, String)} |
| * is invoked. |
| * <li> ImageView. The expected bind value is a resource id or a string and |
| * {@link #setViewImage(ImageView, int)} or {@link #setViewImage(ImageView, String)} is invoked. |
| * </ul> |
| * If no appropriate binding can be found, an {@link IllegalStateException} is thrown. |
| */ |
| public class SimpleAdapter extends BaseAdapter implements Filterable, ThemedSpinnerAdapter { |
| private final LayoutInflater mInflater; |
| |
| private int[] mTo; |
| private String[] mFrom; |
| private ViewBinder mViewBinder; |
| |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) |
| private List<? extends Map<String, ?>> mData; |
| |
| private int mResource; |
| private int mDropDownResource; |
| |
| /** Layout inflater used for {@link #getDropDownView(int, View, ViewGroup)}. */ |
| private LayoutInflater mDropDownInflater; |
| |
| private SimpleFilter mFilter; |
| private ArrayList<Map<String, ?>> mUnfilteredData; |
| |
| /** |
| * Constructor |
| * |
| * @param context The context where the View associated with this SimpleAdapter is running |
| * @param data A List of Maps. Each entry in the List corresponds to one row in the list. The |
| * Maps contain the data for each row, and should include all the entries specified in |
| * "from" |
| * @param resource Resource identifier of a view layout that defines the views for this list |
| * item. The layout file should include at least those named views defined in "to" |
| * @param from A list of column names that will be added to the Map associated with each |
| * item. |
| * @param to The views that should display column in the "from" parameter. These should all be |
| * TextViews. The first N views in this list are given the values of the first N columns |
| * in the from parameter. |
| */ |
| public SimpleAdapter(Context context, List<? extends Map<String, ?>> data, |
| @LayoutRes int resource, String[] from, @IdRes int[] to) { |
| mData = data; |
| mResource = mDropDownResource = resource; |
| mFrom = from; |
| mTo = to; |
| mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); |
| } |
| |
| /** |
| * @see android.widget.Adapter#getCount() |
| */ |
| public int getCount() { |
| return mData.size(); |
| } |
| |
| /** |
| * @see android.widget.Adapter#getItem(int) |
| */ |
| public Object getItem(int position) { |
| return mData.get(position); |
| } |
| |
| /** |
| * @see android.widget.Adapter#getItemId(int) |
| */ |
| public long getItemId(int position) { |
| return position; |
| } |
| |
| /** |
| * @see android.widget.Adapter#getView(int, View, ViewGroup) |
| */ |
| 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 v; |
| if (convertView == null) { |
| v = inflater.inflate(resource, parent, false); |
| } else { |
| v = convertView; |
| } |
| |
| bindView(position, v); |
| |
| return v; |
| } |
| |
| /** |
| * <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) { |
| mDropDownResource = resource; |
| } |
| |
| /** |
| * 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 #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(mInflater.getContext(), 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); |
| } |
| |
| private void bindView(int position, View view) { |
| final Map dataSet = mData.get(position); |
| if (dataSet == null) { |
| return; |
| } |
| |
| final ViewBinder binder = mViewBinder; |
| final String[] from = mFrom; |
| final int[] to = mTo; |
| final int count = to.length; |
| |
| for (int i = 0; i < count; i++) { |
| final View v = view.findViewById(to[i]); |
| if (v != null) { |
| final Object data = dataSet.get(from[i]); |
| String text = data == null ? "" : data.toString(); |
| if (text == null) { |
| text = ""; |
| } |
| |
| boolean bound = false; |
| if (binder != null) { |
| bound = binder.setViewValue(v, data, text); |
| } |
| |
| if (!bound) { |
| if (v instanceof Checkable) { |
| if (data instanceof Boolean) { |
| ((Checkable) v).setChecked((Boolean) data); |
| } else if (v instanceof TextView) { |
| // Note: keep the instanceof TextView check at the bottom of these |
| // ifs since a lot of views are TextViews (e.g. CheckBoxes). |
| setViewText((TextView) v, text); |
| } else { |
| throw new IllegalStateException(v.getClass().getName() + |
| " should be bound to a Boolean, not a " + |
| (data == null ? "<unknown type>" : data.getClass())); |
| } |
| } else if (v instanceof TextView) { |
| // Note: keep the instanceof TextView check at the bottom of these |
| // ifs since a lot of views are TextViews (e.g. CheckBoxes). |
| setViewText((TextView) v, text); |
| } else if (v instanceof ImageView) { |
| if (data instanceof Integer) { |
| setViewImage((ImageView) v, (Integer) data); |
| } else { |
| setViewImage((ImageView) v, text); |
| } |
| } else { |
| throw new IllegalStateException(v.getClass().getName() + " is not a " + |
| " view that can be bounds by this SimpleAdapter"); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Returns the {@link ViewBinder} used to bind data to views. |
| * |
| * @return a ViewBinder or null if the binder does not exist |
| * |
| * @see #setViewBinder(android.widget.SimpleAdapter.ViewBinder) |
| */ |
| public ViewBinder getViewBinder() { |
| return mViewBinder; |
| } |
| |
| /** |
| * Sets the binder used to bind data to views. |
| * |
| * @param viewBinder the binder used to bind data to views, can be null to |
| * remove the existing binder |
| * |
| * @see #getViewBinder() |
| */ |
| public void setViewBinder(ViewBinder viewBinder) { |
| mViewBinder = viewBinder; |
| } |
| |
| /** |
| * Called by bindView() to set the image for an ImageView but only if |
| * there is no existing ViewBinder or if the existing ViewBinder cannot |
| * handle binding to an ImageView. |
| * |
| * This method is called instead of {@link #setViewImage(ImageView, String)} |
| * if the supplied data is an int or Integer. |
| * |
| * @param v ImageView to receive an image |
| * @param value the value retrieved from the data set |
| * |
| * @see #setViewImage(ImageView, String) |
| */ |
| public void setViewImage(ImageView v, int value) { |
| v.setImageResource(value); |
| } |
| |
| /** |
| * Called by bindView() to set the image for an ImageView but only if |
| * there is no existing ViewBinder or if the existing ViewBinder cannot |
| * handle binding to an ImageView. |
| * |
| * By default, the value will be treated as an image resource. If the |
| * value cannot be used as an image resource, the value is used as an |
| * image Uri. |
| * |
| * This method is called instead of {@link #setViewImage(ImageView, int)} |
| * if the supplied data is not an int or Integer. |
| * |
| * @param v ImageView to receive an image |
| * @param value the value retrieved from the data set |
| * |
| * @see #setViewImage(ImageView, int) |
| */ |
| public void setViewImage(ImageView v, String value) { |
| try { |
| v.setImageResource(Integer.parseInt(value)); |
| } catch (NumberFormatException nfe) { |
| v.setImageURI(Uri.parse(value)); |
| } |
| } |
| |
| /** |
| * Called by bindView() to set the text for a TextView but only if |
| * there is no existing ViewBinder or if the existing ViewBinder cannot |
| * handle binding to a TextView. |
| * |
| * @param v TextView to receive text |
| * @param text the text to be set for the TextView |
| */ |
| public void setViewText(TextView v, String text) { |
| v.setText(text); |
| } |
| |
| public Filter getFilter() { |
| if (mFilter == null) { |
| mFilter = new SimpleFilter(); |
| } |
| return mFilter; |
| } |
| |
| /** |
| * This class can be used by external clients of SimpleAdapter to bind |
| * values to views. |
| * |
| * You should use this class to bind values to views that are not |
| * directly supported by SimpleAdapter or to change the way binding |
| * occurs for views supported by SimpleAdapter. |
| * |
| * @see SimpleAdapter#setViewImage(ImageView, int) |
| * @see SimpleAdapter#setViewImage(ImageView, String) |
| * @see SimpleAdapter#setViewText(TextView, String) |
| */ |
| public static interface ViewBinder { |
| /** |
| * Binds the specified data to the specified view. |
| * |
| * When binding is handled by this ViewBinder, this method must return true. |
| * If this method returns false, SimpleAdapter will attempts to handle |
| * the binding on its own. |
| * |
| * @param view the view to bind the data to |
| * @param data the data to bind to the view |
| * @param textRepresentation a safe String representation of the supplied data: |
| * it is either the result of data.toString() or an empty String but it |
| * is never null |
| * |
| * @return true if the data was bound to the view, false otherwise |
| */ |
| boolean setViewValue(View view, Object data, String textRepresentation); |
| } |
| |
| /** |
| * <p>An array filters 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 SimpleFilter extends Filter { |
| |
| @Override |
| protected FilterResults performFiltering(CharSequence prefix) { |
| FilterResults results = new FilterResults(); |
| |
| if (mUnfilteredData == null) { |
| mUnfilteredData = new ArrayList<Map<String, ?>>(mData); |
| } |
| |
| if (prefix == null || prefix.length() == 0) { |
| ArrayList<Map<String, ?>> list = mUnfilteredData; |
| results.values = list; |
| results.count = list.size(); |
| } else { |
| String prefixString = prefix.toString().toLowerCase(); |
| |
| ArrayList<Map<String, ?>> unfilteredValues = mUnfilteredData; |
| int count = unfilteredValues.size(); |
| |
| ArrayList<Map<String, ?>> newValues = new ArrayList<Map<String, ?>>(count); |
| |
| for (int i = 0; i < count; i++) { |
| Map<String, ?> h = unfilteredValues.get(i); |
| if (h != null) { |
| |
| int len = mTo.length; |
| |
| for (int j=0; j<len; j++) { |
| String str = (String)h.get(mFrom[j]); |
| |
| String[] words = str.split(" "); |
| int wordCount = words.length; |
| |
| for (int k = 0; k < wordCount; k++) { |
| String word = words[k]; |
| |
| if (word.toLowerCase().startsWith(prefixString)) { |
| newValues.add(h); |
| break; |
| } |
| } |
| } |
| } |
| } |
| |
| results.values = newValues; |
| results.count = newValues.size(); |
| } |
| |
| return results; |
| } |
| |
| @Override |
| protected void publishResults(CharSequence constraint, FilterResults results) { |
| //noinspection unchecked |
| mData = (List<Map<String, ?>>) results.values; |
| if (results.count > 0) { |
| notifyDataSetChanged(); |
| } else { |
| notifyDataSetInvalidated(); |
| } |
| } |
| } |
| } |