auto import from //depot/cupcake/@135843
diff --git a/core/java/android/preference/PreferenceScreen.java b/core/java/android/preference/PreferenceScreen.java
new file mode 100644
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--- /dev/null
+++ b/core/java/android/preference/PreferenceScreen.java
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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.preference;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.Adapter;
+import android.widget.AdapterView;
+import android.widget.ListAdapter;
+import android.widget.ListView;
+
+/**
+ * Represents a top-level {@link Preference} that
+ * is the root of a Preference hierarchy. A {@link PreferenceActivity}
+ * points to an instance of this class to show the preferences. To instantiate
+ * this class, use {@link PreferenceManager#createPreferenceScreen(Context)}.
+ * <ul>
+ * This class can appear in two places:
+ * <li> When a {@link PreferenceActivity} points to this, it is used as the root
+ * and is not shown (only the contained preferences are shown).
+ * <li> When it appears inside another preference hierarchy, it is shown and
+ * serves as the gateway to another screen of preferences (either by showing
+ * another screen of preferences as a {@link Dialog} or via a
+ * {@link Context#startActivity(android.content.Intent)} from the
+ * {@link Preference#getIntent()}). The children of this {@link PreferenceScreen}
+ * are NOT shown in the screen that this {@link PreferenceScreen} is shown in.
+ * Instead, a separate screen will be shown when this preference is clicked.
+ * </ul>
+ * <p>Here's an example XML layout of a PreferenceScreen:</p>
+ * <pre>
+<PreferenceScreen
+ xmlns:android="http://schemas.android.com/apk/res/android"
+ android:key="first_preferencescreen">
+ <CheckBoxPreference
+ android:key="wifi enabled"
+ android:title="WiFi" />
+ <PreferenceScreen
+ android:key="second_preferencescreen"
+ android:title="WiFi settings">
+ <CheckBoxPreference
+ android:key="prefer wifi"
+ android:title="Prefer WiFi" />
+ ... other preferences here ...
+ </PreferenceScreen>
+</PreferenceScreen> </pre>
+ * <p>
+ * In this example, the "first_preferencescreen" will be used as the root of the
+ * hierarchy and given to a {@link PreferenceActivity}. The first screen will
+ * show preferences "WiFi" (which can be used to quickly enable/disable WiFi)
+ * and "WiFi settings". The "WiFi settings" is the "second_preferencescreen" and when
+ * clicked will show another screen of preferences such as "Prefer WiFi" (and
+ * the other preferences that are children of the "second_preferencescreen" tag).
+ *
+ * @see PreferenceCategory
+ */
+public final class PreferenceScreen extends PreferenceGroup implements AdapterView.OnItemClickListener,
+ DialogInterface.OnDismissListener {
+
+ private ListAdapter mRootAdapter;
+
+ private Dialog mDialog;
+
+ /**
+ * Do NOT use this constructor, use {@link PreferenceManager#createPreferenceScreen(Context)}.
+ * @hide-
+ */
+ public PreferenceScreen(Context context, AttributeSet attrs) {
+ super(context, attrs, com.android.internal.R.attr.preferenceScreenStyle);
+ }
+
+ /**
+ * Returns an adapter that can be attached to a {@link PreferenceActivity}
+ * to show the preferences contained in this {@link PreferenceScreen}.
+ * <p>
+ * This {@link PreferenceScreen} will NOT appear in the returned adapter, instead
+ * it appears in the hierarchy above this {@link PreferenceScreen}.
+ * <p>
+ * This adapter's {@link Adapter#getItem(int)} should always return a
+ * subclass of {@link Preference}.
+ *
+ * @return An adapter that provides the {@link Preference} contained in this
+ * {@link PreferenceScreen}.
+ */
+ public ListAdapter getRootAdapter() {
+ if (mRootAdapter == null) {
+ mRootAdapter = onCreateRootAdapter();
+ }
+
+ return mRootAdapter;
+ }
+
+ /**
+ * Creates the root adapter.
+ *
+ * @return An adapter that contains the preferences contained in this {@link PreferenceScreen}.
+ * @see #getRootAdapter()
+ */
+ protected ListAdapter onCreateRootAdapter() {
+ return new PreferenceGroupAdapter(this);
+ }
+
+ /**
+ * Binds a {@link ListView} to the preferences contained in this {@link PreferenceScreen} via
+ * {@link #getRootAdapter()}. It also handles passing list item clicks to the corresponding
+ * {@link Preference} contained by this {@link PreferenceScreen}.
+ *
+ * @param listView The list view to attach to.
+ */
+ public void bind(ListView listView) {
+ listView.setOnItemClickListener(this);
+ listView.setAdapter(getRootAdapter());
+
+ onAttachedToActivity();
+ }
+
+ @Override
+ protected void onClick() {
+ if (getIntent() != null || getPreferenceCount() == 0) {
+ return;
+ }
+
+ showDialog(null);
+ }
+
+ private void showDialog(Bundle state) {
+ Context context = getContext();
+ ListView listView = new ListView(context);
+ bind(listView);
+
+ Dialog dialog = mDialog = new Dialog(context, com.android.internal.R.style.Theme_NoTitleBar);
+ dialog.setContentView(listView);
+ dialog.setOnDismissListener(this);
+ if (state != null) {
+ dialog.onRestoreInstanceState(state);
+ }
+
+ // Add the screen to the list of preferences screens opened as dialogs
+ getPreferenceManager().addPreferencesScreen(dialog);
+
+ dialog.show();
+ }
+
+ public void onDismiss(DialogInterface dialog) {
+ mDialog = null;
+ getPreferenceManager().removePreferencesScreen(dialog);
+ }
+
+ /**
+ * Used to get a handle to the dialog.
+ * This is useful for cases where we want to manipulate the dialog
+ * as we would with any other activity or view.
+ */
+ public Dialog getDialog() {
+ return mDialog;
+ }
+
+ public void onItemClick(AdapterView parent, View view, int position, long id) {
+ Object item = getRootAdapter().getItem(position);
+ if (!(item instanceof Preference)) return;
+
+ final Preference preference = (Preference) item;
+ preference.performClick(this);
+ }
+
+ @Override
+ protected boolean isOnSameScreenAsChildren() {
+ return false;
+ }
+
+ @Override
+ protected Parcelable onSaveInstanceState() {
+ final Parcelable superState = super.onSaveInstanceState();
+ final Dialog dialog = mDialog;
+ if (dialog == null || !dialog.isShowing()) {
+ return superState;
+ }
+
+ final SavedState myState = new SavedState(superState);
+ myState.isDialogShowing = true;
+ myState.dialogBundle = dialog.onSaveInstanceState();
+ return myState;
+ }
+
+ @Override
+ protected void onRestoreInstanceState(Parcelable state) {
+ if (state == null || !state.getClass().equals(SavedState.class)) {
+ // Didn't save state for us in onSaveInstanceState
+ super.onRestoreInstanceState(state);
+ return;
+ }
+
+ SavedState myState = (SavedState) state;
+ super.onRestoreInstanceState(myState.getSuperState());
+ if (myState.isDialogShowing) {
+ showDialog(myState.dialogBundle);
+ }
+ }
+
+ private static class SavedState extends BaseSavedState {
+ boolean isDialogShowing;
+ Bundle dialogBundle;
+
+ public SavedState(Parcel source) {
+ super(source);
+ isDialogShowing = source.readInt() == 1;
+ dialogBundle = source.readBundle();
+ }
+
+ @Override
+ public void writeToParcel(Parcel dest, int flags) {
+ super.writeToParcel(dest, flags);
+ dest.writeInt(isDialogShowing ? 1 : 0);
+ dest.writeBundle(dialogBundle);
+ }
+
+ public SavedState(Parcelable superState) {
+ super(superState);
+ }
+
+ public static final Parcelable.Creator<SavedState> CREATOR =
+ new Parcelable.Creator<SavedState>() {
+ public SavedState createFromParcel(Parcel in) {
+ return new SavedState(in);
+ }
+
+ public SavedState[] newArray(int size) {
+ return new SavedState[size];
+ }
+ };
+ }
+
+}