chrome/android/java/src/org/chromium/chrome/browser/ItemChooserDialog.java - chromium/src - Git at Google

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 package org.chromium.chrome.browser;

 import android.app.Activity;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.graphics.Color;
 import android.graphics.drawable.ColorDrawable;
 import android.text.SpannableString;
 import android.text.method.LinkMovementMethod;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.view.Window;
 import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.LinearLayout;
 import android.widget.ListView;
 import android.widget.ProgressBar;
 import android.widget.TextView;

 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.util.MathUtils;
 import org.chromium.ui.base.DeviceFormFactor;
 import org.chromium.ui.widget.TextViewWithClickableSpans;

 import java.util.HashSet;
 import java.util.Set;

 /**
  * A general-purpose dialog for presenting a list of things to pick from.
  */
 public class ItemChooserDialog {
     /**
      * An interface to implement to get a callback when something has been
      * selected.
      */
     public interface ItemSelectedCallback {
         /**
          * Returns the user selection.
          *
          * @param id The id of the item selected. Blank if the dialog was closed
          * without selecting anything.
          */
         void onItemSelected(String id);
     }

     /**
      * A class representing one data row in the picker.
      */
     public static class ItemChooserRow {
         private final String mKey;
         private final String mDescription;

         public ItemChooserRow(String key, String description) {
             mKey = key;
             mDescription = description;
         }

         @Override
         public boolean equals(Object obj) {
             if (!(obj instanceof ItemChooserRow)) return false;
             if (this == obj) return true;
             ItemChooserRow item = (ItemChooserRow) obj;
             return mKey.equals(item.mKey) && mDescription.equals(item.mDescription);
         }

         @Override
         public int hashCode() {
             return mKey.hashCode() + mDescription.hashCode();
         }
     }

     /**
      * The labels to show in the dialog.
      */
     public static class ItemChooserLabels {
         // The title at the top of the dialog.
         public final CharSequence mTitle;
         // The message to show while there are no results.
         public final CharSequence mSearching;
         // The message to show when no results were produced.
         public final CharSequence mNoneFound;
         // A status message to show above the button row after discovery has
         // stopped and no devices have been found.
         public final CharSequence mStatusIdleNoneFound;
         // A status message to show above the button row after an item has
         // been added and discovery has stopped.
         public final CharSequence mStatusIdleSomeFound;
         // The label for the positive button (e.g. Select/Pair).
         public final CharSequence mPositiveButton;

         public ItemChooserLabels(CharSequence title, CharSequence searching, CharSequence noneFound,
                 CharSequence statusIdleNoneFound, CharSequence statusIdleSomeFound,
                 CharSequence positiveButton) {
             mTitle = title;
             mSearching = searching;
             mNoneFound = noneFound;
             mStatusIdleNoneFound = statusIdleNoneFound;
             mStatusIdleSomeFound = statusIdleSomeFound;
             mPositiveButton = positiveButton;
         }
     }

     /**
      * The various states the dialog can represent.
      */
     private enum State { STARTING, DISCOVERY_IDLE }

     /**
      * An adapter for keeping track of which items to show in the dialog.
      */
     private class ItemAdapter extends ArrayAdapter<ItemChooserRow>
             implements AdapterView.OnItemClickListener {
         private final LayoutInflater mInflater;

         // The background color of the highlighted item.
         private final int mBackgroundHighlightColor;

         // The color of the non-highlighted text.
         private final int mDefaultTextColor;

         // The zero-based index of the item currently selected in the dialog,
         // or -1 (INVALID_POSITION) if nothing is selected.
         private int mSelectedItem = ListView.INVALID_POSITION;

         // A set of keys that are marked as disabled in the dialog.
         private Set<String> mDisabledEntries = new HashSet<String>();

         public ItemAdapter(Context context, int resource) {
             super(context, resource);

             mInflater = LayoutInflater.from(context);

             mBackgroundHighlightColor = ApiCompatibilityUtils.getColor(getContext().getResources(),
                     R.color.light_active_color);
             mDefaultTextColor = ApiCompatibilityUtils.getColor(getContext().getResources(),
                     R.color.default_text_color);
         }

         @Override
         public void clear() {
             mSelectedItem = ListView.INVALID_POSITION;
             mConfirmButton.setEnabled(false);
             super.clear();
         }

         /**
          * Returns the key of the currently selected item or blank if nothing is
          * selected.
          */
         public String getSelectedItemKey() {
             ItemChooserRow row = getItem(mSelectedItem);
             if (row == null) return "";
             return row.mKey;
         }

         /**
          * Sets whether the itam is enabled. Disabled items are grayed out.
          * @param id The id of the item to affect.
          * @param enabled Whether the item should be enabled or not.
          */
         public void setEnabled(String id, boolean enabled) {
             if (enabled) {
                 mDisabledEntries.remove(id);
             } else {
                 mDisabledEntries.add(id);
             }
             notifyDataSetChanged();
         }

         @Override
         public boolean isEnabled(int position) {
             ItemChooserRow item = getItem(position);
             return !mDisabledEntries.contains(item.mKey);
         }

         @Override
         public int getViewTypeCount() {
             return 1;
         }

         @Override
         public long getItemId(int position) {
             return position;
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             TextView view;
             if (convertView instanceof TextView) {
                 view = (TextView) convertView;
             } else {
                 view = (TextView) mInflater.inflate(
                         R.layout.item_chooser_dialog_row, parent, false);
             }

             // Set highlighting for currently selected item.
             if (position == mSelectedItem) {
                 view.setBackgroundColor(mBackgroundHighlightColor);
                 view.setTextColor(Color.WHITE);
             } else {
                 view.setBackground(null);
                 if (!isEnabled(position)) {
                     view.setTextColor(ApiCompatibilityUtils.getColor(getContext().getResources(),
                             R.color.primary_text_disabled_material_light));
                 } else {
                     view.setTextColor(mDefaultTextColor);
                 }
             }

             ItemChooserRow item = getItem(position);
             view.setText(item.mDescription);
             return view;
         }

         @Override
         public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {
             mSelectedItem = position;
             mConfirmButton.setEnabled(true);
             mItemAdapter.notifyDataSetChanged();
         }
     }

     private Activity mActivity;

     // The dialog this class encapsulates.
     private Dialog mDialog;

     // The callback to notify when the user selected an item.
     private ItemSelectedCallback mItemSelectedCallback;

     // Individual UI elements.
     private TextViewWithClickableSpans mTitle;
     private TextViewWithClickableSpans mEmptyMessage;
     private ProgressBar mProgressBar;
     private ListView mListView;
     private TextView mStatus;
     private Button mConfirmButton;

     // The labels to display in the dialog.
     private ItemChooserLabels mLabels;

     // The adapter containing the items to show in the dialog.
     private ItemAdapter mItemAdapter;

     // How much of the height of the screen should be taken up by the listview.
     private static final float LISTVIEW_HEIGHT_PERCENT = 0.30f;
     // The height of a row of the listview in dp.
     private static final int LIST_ROW_HEIGHT_DP = 48;
     // The minimum height of the listview in the dialog (in dp).
     private static final int MIN_HEIGHT_DP = (int) (LIST_ROW_HEIGHT_DP * 1.5);
     // The maximum height of the listview in the dialog (in dp).
     private static final int MAX_HEIGHT_DP = (int) (LIST_ROW_HEIGHT_DP * 8.5);

     /**
      * Creates the ItemChooserPopup and displays it (and starts waiting for data).
      *
      * @param activity Activity which is used for launching a dialog.
      * @param callback The callback used to communicate back what was selected.
      * @param labels The labels to show in the dialog.
      */
     public ItemChooserDialog(
             Activity activity, ItemSelectedCallback callback, ItemChooserLabels labels) {
         mActivity = activity;
         mItemSelectedCallback = callback;
         mLabels = labels;

         LinearLayout dialogContainer = (LinearLayout) LayoutInflater.from(mActivity).inflate(
                 R.layout.item_chooser_dialog, null);

         mListView = (ListView) dialogContainer.findViewById(R.id.items);
         mProgressBar = (ProgressBar) dialogContainer.findViewById(R.id.progress);
         mStatus = (TextView) dialogContainer.findViewById(R.id.status);
         mTitle = (TextViewWithClickableSpans) dialogContainer.findViewById(
                 R.id.dialog_title);
         mEmptyMessage =
                 (TextViewWithClickableSpans) dialogContainer.findViewById(R.id.not_found_message);

         mTitle.setText(labels.mTitle);
         mTitle.setMovementMethod(LinkMovementMethod.getInstance());

         mEmptyMessage.setMovementMethod(LinkMovementMethod.getInstance());
         mStatus.setMovementMethod(LinkMovementMethod.getInstance());

         mConfirmButton = (Button) dialogContainer.findViewById(R.id.positive);
         mConfirmButton.setText(labels.mPositiveButton);
         mConfirmButton.setEnabled(false);
         mConfirmButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 mItemSelectedCallback.onItemSelected(mItemAdapter.getSelectedItemKey());
                 mDialog.setOnDismissListener(null);
                 mDialog.dismiss();
             }
         });

         mItemAdapter = new ItemAdapter(mActivity, R.layout.item_chooser_dialog_row);
         mListView.setAdapter(mItemAdapter);
         mListView.setEmptyView(mEmptyMessage);
         mListView.setOnItemClickListener(mItemAdapter);
         mListView.setDivider(null);
         setState(State.STARTING);

         // The list is the main element in the dialog and it should grow and
         // shrink according to the size of the screen available.
         View listViewContainer = dialogContainer.findViewById(R.id.container);
         listViewContainer.setLayoutParams(new LinearLayout.LayoutParams(
                 LayoutParams.MATCH_PARENT,
                 getListHeight(mActivity.getWindow().getDecorView().getHeight(),
                         mActivity.getResources().getDisplayMetrics().density)));

         showDialogForView(dialogContainer);
     }

     // Computes the height of the device list, bound to half-multiples of the
     // row height so that it's obvious if there are more elements to scroll to.
     @VisibleForTesting
     static int getListHeight(int decorHeight, float density) {
         float heightDp = decorHeight / density * LISTVIEW_HEIGHT_PERCENT;
         // Round to (an integer + 0.5) times LIST_ROW_HEIGHT.
         heightDp = (Math.round(heightDp / LIST_ROW_HEIGHT_DP - 0.5f) + 0.5f) * LIST_ROW_HEIGHT_DP;
         heightDp = MathUtils.clamp(heightDp, MIN_HEIGHT_DP, MAX_HEIGHT_DP);
         return (int) Math.round(heightDp * density);
     }

     private void showDialogForView(View view) {
         mDialog = new Dialog(mActivity);
         mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
         mDialog.addContentView(view,
                 new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
                                               LinearLayout.LayoutParams.MATCH_PARENT));
         mDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
             @Override
             public void onDismiss(DialogInterface dialog) {
                 mItemSelectedCallback.onItemSelected("");
             }
         });

         Window window = mDialog.getWindow();
         if (!DeviceFormFactor.isTablet(mActivity)) {
             // On smaller screens, make the dialog fill the width of the screen,
             // and appear at the top.
             window.setBackgroundDrawable(new ColorDrawable(Color.WHITE));
             window.setGravity(Gravity.TOP);
             window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
                              ViewGroup.LayoutParams.WRAP_CONTENT);
         }

         mDialog.show();
     }

     public void dismiss() {
         mDialog.dismiss();
     }

     /**
     * Add an item to the end of the list to show in the dialog.
     *
     * @param item The item to be added to the end of the chooser.
     */
     public void addItemToList(ItemChooserRow item) {
         mProgressBar.setVisibility(View.GONE);
         mItemAdapter.add(item);
         setState(State.DISCOVERY_IDLE);
     }

     /**
     * Remove an item that is shown in the dialog.
     *
     * @param item The item to be removed in the chooser.
     */
     public void removeItemFromList(ItemChooserRow item) {
         mItemAdapter.remove(item);
         setState(State.DISCOVERY_IDLE);
     }

     /**
      * Indicates the chooser that no more items will be added.
      */
     public void setIdleState() {
         mProgressBar.setVisibility(View.GONE);
         setState(State.DISCOVERY_IDLE);
     }

     /**
      * Sets whether the item is enabled.
      * @param id The id of the item to affect.
      * @param enabled Whether the item should be enabled or not.
      */
     public void setEnabled(String id, boolean enabled) {
         mItemAdapter.setEnabled(id, enabled);
     }

     /**
      * Clear all items from the dialog.
      */
     public void clear() {
         mItemAdapter.clear();
         setState(State.STARTING);
     }

     /**
      * Shows an error message in the dialog.
      */
     public void setErrorState(SpannableString errorMessage, SpannableString errorStatus) {
         mListView.setVisibility(View.GONE);
         mProgressBar.setVisibility(View.GONE);
         mEmptyMessage.setText(errorMessage);
         mEmptyMessage.setVisibility(View.VISIBLE);
         mStatus.setText(errorStatus);
     }

     private void setState(State state) {
         switch (state) {
             case STARTING:
                 mStatus.setText(mLabels.mSearching);
                 mListView.setVisibility(View.GONE);
                 mProgressBar.setVisibility(View.VISIBLE);
                 mEmptyMessage.setVisibility(View.GONE);
                 break;
             case DISCOVERY_IDLE:
                 boolean showEmptyMessage = mItemAdapter.isEmpty();
                 mStatus.setText(showEmptyMessage
                         ? mLabels.mStatusIdleNoneFound : mLabels.mStatusIdleSomeFound);
                 mEmptyMessage.setText(mLabels.mNoneFound);
                 mEmptyMessage.setVisibility(showEmptyMessage ? View.VISIBLE : View.GONE);
                 break;
         }
     }

     /**
      * Returns the dialog associated with this class. For use with tests only.
      */
     @VisibleForTesting
     public Dialog getDialogForTesting() {
         return mDialog;
     }

     /**
      * Returns the ItemAdapter associated with this class. For use with tests only.
      */
     @VisibleForTesting
     public ItemAdapter getItemAdapterForTesting() {
         return mItemAdapter;
     }
 }
	// Copyright 2015 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	package org.chromium.chrome.browser;

	import android.app.Activity;
	import android.app.Dialog;
	import android.content.Context;
	import android.content.DialogInterface;
	import android.graphics.Color;
	import android.graphics.drawable.ColorDrawable;
	import android.text.SpannableString;
	import android.text.method.LinkMovementMethod;
	import android.view.Gravity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.view.ViewGroup.LayoutParams;
	import android.view.Window;
	import android.widget.AdapterView;
	import android.widget.ArrayAdapter;
	import android.widget.Button;
	import android.widget.LinearLayout;
	import android.widget.ListView;
	import android.widget.ProgressBar;
	import android.widget.TextView;

	import org.chromium.base.ApiCompatibilityUtils;
	import org.chromium.base.VisibleForTesting;
	import org.chromium.chrome.R;
	import org.chromium.chrome.browser.util.MathUtils;
	import org.chromium.ui.base.DeviceFormFactor;
	import org.chromium.ui.widget.TextViewWithClickableSpans;

	import java.util.HashSet;
	import java.util.Set;

	/**
	* A general-purpose dialog for presenting a list of things to pick from.
	*/
	public class ItemChooserDialog {
	/**
	* An interface to implement to get a callback when something has been
	* selected.
	*/
	public interface ItemSelectedCallback {
	/**
	* Returns the user selection.
	*
	* @param id The id of the item selected. Blank if the dialog was closed
	* without selecting anything.
	*/
	void onItemSelected(String id);
	}

	/**
	* A class representing one data row in the picker.
	*/
	public static class ItemChooserRow {
	private final String mKey;
	private final String mDescription;

	public ItemChooserRow(String key, String description) {
	mKey = key;
	mDescription = description;
	}

	@Override
	public boolean equals(Object obj) {
	if (!(obj instanceof ItemChooserRow)) return false;
	if (this == obj) return true;
	ItemChooserRow item = (ItemChooserRow) obj;
	return mKey.equals(item.mKey) && mDescription.equals(item.mDescription);
	}

	@Override
	public int hashCode() {
	return mKey.hashCode() + mDescription.hashCode();
	}
	}

	/**
	* The labels to show in the dialog.
	*/
	public static class ItemChooserLabels {
	// The title at the top of the dialog.
	public final CharSequence mTitle;
	// The message to show while there are no results.
	public final CharSequence mSearching;
	// The message to show when no results were produced.
	public final CharSequence mNoneFound;
	// A status message to show above the button row after discovery has
	// stopped and no devices have been found.
	public final CharSequence mStatusIdleNoneFound;
	// A status message to show above the button row after an item has
	// been added and discovery has stopped.
	public final CharSequence mStatusIdleSomeFound;
	// The label for the positive button (e.g. Select/Pair).
	public final CharSequence mPositiveButton;

	public ItemChooserLabels(CharSequence title, CharSequence searching, CharSequence noneFound,
	CharSequence statusIdleNoneFound, CharSequence statusIdleSomeFound,
	CharSequence positiveButton) {
	mTitle = title;
	mSearching = searching;
	mNoneFound = noneFound;
	mStatusIdleNoneFound = statusIdleNoneFound;
	mStatusIdleSomeFound = statusIdleSomeFound;
	mPositiveButton = positiveButton;
	}
	}

	/**
	* The various states the dialog can represent.
	*/
	private enum State { STARTING, DISCOVERY_IDLE }

	/**
	* An adapter for keeping track of which items to show in the dialog.
	*/
	private class ItemAdapter extends ArrayAdapter<ItemChooserRow>
	implements AdapterView.OnItemClickListener {
	private final LayoutInflater mInflater;

	// The background color of the highlighted item.
	private final int mBackgroundHighlightColor;

	// The color of the non-highlighted text.
	private final int mDefaultTextColor;

	// The zero-based index of the item currently selected in the dialog,
	// or -1 (INVALID_POSITION) if nothing is selected.
	private int mSelectedItem = ListView.INVALID_POSITION;

	// A set of keys that are marked as disabled in the dialog.
	private Set<String> mDisabledEntries = new HashSet<String>();

	public ItemAdapter(Context context, int resource) {
	super(context, resource);

	mInflater = LayoutInflater.from(context);

	mBackgroundHighlightColor = ApiCompatibilityUtils.getColor(getContext().getResources(),
	R.color.light_active_color);
	mDefaultTextColor = ApiCompatibilityUtils.getColor(getContext().getResources(),
	R.color.default_text_color);
	}

	@Override
	public void clear() {
	mSelectedItem = ListView.INVALID_POSITION;
	mConfirmButton.setEnabled(false);
	super.clear();
	}

	/**
	* Returns the key of the currently selected item or blank if nothing is
	* selected.
	*/
	public String getSelectedItemKey() {
	ItemChooserRow row = getItem(mSelectedItem);
	if (row == null) return "";
	return row.mKey;
	}

	/**
	* Sets whether the itam is enabled. Disabled items are grayed out.
	* @param id The id of the item to affect.
	* @param enabled Whether the item should be enabled or not.
	*/
	public void setEnabled(String id, boolean enabled) {
	if (enabled) {
	mDisabledEntries.remove(id);
	} else {
	mDisabledEntries.add(id);
	}
	notifyDataSetChanged();
	}

	@Override
	public boolean isEnabled(int position) {
	ItemChooserRow item = getItem(position);
	return !mDisabledEntries.contains(item.mKey);
	}

	@Override
	public int getViewTypeCount() {
	return 1;
	}

	@Override
	public long getItemId(int position) {
	return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	TextView view;
	if (convertView instanceof TextView) {
	view = (TextView) convertView;
	} else {
	view = (TextView) mInflater.inflate(
	R.layout.item_chooser_dialog_row, parent, false);
	}

	// Set highlighting for currently selected item.
	if (position == mSelectedItem) {
	view.setBackgroundColor(mBackgroundHighlightColor);
	view.setTextColor(Color.WHITE);
	} else {
	view.setBackground(null);
	if (!isEnabled(position)) {
	view.setTextColor(ApiCompatibilityUtils.getColor(getContext().getResources(),
	R.color.primary_text_disabled_material_light));
	} else {
	view.setTextColor(mDefaultTextColor);
	}
	}

	ItemChooserRow item = getItem(position);
	view.setText(item.mDescription);
	return view;
	}

	@Override
	public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {
	mSelectedItem = position;
	mConfirmButton.setEnabled(true);
	mItemAdapter.notifyDataSetChanged();
	}
	}

	private Activity mActivity;

	// The dialog this class encapsulates.
	private Dialog mDialog;

	// The callback to notify when the user selected an item.
	private ItemSelectedCallback mItemSelectedCallback;

	// Individual UI elements.
	private TextViewWithClickableSpans mTitle;
	private TextViewWithClickableSpans mEmptyMessage;
	private ProgressBar mProgressBar;
	private ListView mListView;
	private TextView mStatus;
	private Button mConfirmButton;

	// The labels to display in the dialog.
	private ItemChooserLabels mLabels;

	// The adapter containing the items to show in the dialog.
	private ItemAdapter mItemAdapter;

	// How much of the height of the screen should be taken up by the listview.
	private static final float LISTVIEW_HEIGHT_PERCENT = 0.30f;
	// The height of a row of the listview in dp.
	private static final int LIST_ROW_HEIGHT_DP = 48;
	// The minimum height of the listview in the dialog (in dp).
	private static final int MIN_HEIGHT_DP = (int) (LIST_ROW_HEIGHT_DP * 1.5);
	// The maximum height of the listview in the dialog (in dp).
	private static final int MAX_HEIGHT_DP = (int) (LIST_ROW_HEIGHT_DP * 8.5);

	/**
	* Creates the ItemChooserPopup and displays it (and starts waiting for data).
	*
	* @param activity Activity which is used for launching a dialog.
	* @param callback The callback used to communicate back what was selected.
	* @param labels The labels to show in the dialog.
	*/
	public ItemChooserDialog(
	Activity activity, ItemSelectedCallback callback, ItemChooserLabels labels) {
	mActivity = activity;
	mItemSelectedCallback = callback;
	mLabels = labels;

	LinearLayout dialogContainer = (LinearLayout) LayoutInflater.from(mActivity).inflate(
	R.layout.item_chooser_dialog, null);

	mListView = (ListView) dialogContainer.findViewById(R.id.items);
	mProgressBar = (ProgressBar) dialogContainer.findViewById(R.id.progress);
	mStatus = (TextView) dialogContainer.findViewById(R.id.status);
	mTitle = (TextViewWithClickableSpans) dialogContainer.findViewById(
	R.id.dialog_title);
	mEmptyMessage =
	(TextViewWithClickableSpans) dialogContainer.findViewById(R.id.not_found_message);

	mTitle.setText(labels.mTitle);
	mTitle.setMovementMethod(LinkMovementMethod.getInstance());

	mEmptyMessage.setMovementMethod(LinkMovementMethod.getInstance());
	mStatus.setMovementMethod(LinkMovementMethod.getInstance());

	mConfirmButton = (Button) dialogContainer.findViewById(R.id.positive);
	mConfirmButton.setText(labels.mPositiveButton);
	mConfirmButton.setEnabled(false);
	mConfirmButton.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	mItemSelectedCallback.onItemSelected(mItemAdapter.getSelectedItemKey());
	mDialog.setOnDismissListener(null);
	mDialog.dismiss();
	}
	});

	mItemAdapter = new ItemAdapter(mActivity, R.layout.item_chooser_dialog_row);
	mListView.setAdapter(mItemAdapter);
	mListView.setEmptyView(mEmptyMessage);
	mListView.setOnItemClickListener(mItemAdapter);
	mListView.setDivider(null);
	setState(State.STARTING);

	// The list is the main element in the dialog and it should grow and
	// shrink according to the size of the screen available.
	View listViewContainer = dialogContainer.findViewById(R.id.container);
	listViewContainer.setLayoutParams(new LinearLayout.LayoutParams(
	LayoutParams.MATCH_PARENT,
	getListHeight(mActivity.getWindow().getDecorView().getHeight(),
	mActivity.getResources().getDisplayMetrics().density)));

	showDialogForView(dialogContainer);
	}

	// Computes the height of the device list, bound to half-multiples of the
	// row height so that it's obvious if there are more elements to scroll to.
	@VisibleForTesting
	static int getListHeight(int decorHeight, float density) {
	float heightDp = decorHeight / density * LISTVIEW_HEIGHT_PERCENT;
	// Round to (an integer + 0.5) times LIST_ROW_HEIGHT.
	heightDp = (Math.round(heightDp / LIST_ROW_HEIGHT_DP - 0.5f) + 0.5f) * LIST_ROW_HEIGHT_DP;
	heightDp = MathUtils.clamp(heightDp, MIN_HEIGHT_DP, MAX_HEIGHT_DP);
	return (int) Math.round(heightDp * density);
	}

	private void showDialogForView(View view) {
	mDialog = new Dialog(mActivity);
	mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
	mDialog.addContentView(view,
	new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
	LinearLayout.LayoutParams.MATCH_PARENT));
	mDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
	@Override
	public void onDismiss(DialogInterface dialog) {
	mItemSelectedCallback.onItemSelected("");
	}
	});

	Window window = mDialog.getWindow();
	if (!DeviceFormFactor.isTablet(mActivity)) {
	// On smaller screens, make the dialog fill the width of the screen,
	// and appear at the top.
	window.setBackgroundDrawable(new ColorDrawable(Color.WHITE));
	window.setGravity(Gravity.TOP);
	window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
	ViewGroup.LayoutParams.WRAP_CONTENT);
	}

	mDialog.show();
	}

	public void dismiss() {
	mDialog.dismiss();
	}

	/**
	* Add an item to the end of the list to show in the dialog.
	*
	* @param item The item to be added to the end of the chooser.
	*/
	public void addItemToList(ItemChooserRow item) {
	mProgressBar.setVisibility(View.GONE);
	mItemAdapter.add(item);
	setState(State.DISCOVERY_IDLE);
	}

	/**
	* Remove an item that is shown in the dialog.
	*
	* @param item The item to be removed in the chooser.
	*/
	public void removeItemFromList(ItemChooserRow item) {
	mItemAdapter.remove(item);
	setState(State.DISCOVERY_IDLE);
	}

	/**
	* Indicates the chooser that no more items will be added.
	*/
	public void setIdleState() {
	mProgressBar.setVisibility(View.GONE);
	setState(State.DISCOVERY_IDLE);
	}

	/**
	* Sets whether the item is enabled.
	* @param id The id of the item to affect.
	* @param enabled Whether the item should be enabled or not.
	*/
	public void setEnabled(String id, boolean enabled) {
	mItemAdapter.setEnabled(id, enabled);
	}

	/**
	* Clear all items from the dialog.
	*/
	public void clear() {
	mItemAdapter.clear();
	setState(State.STARTING);
	}

	/**
	* Shows an error message in the dialog.
	*/
	public void setErrorState(SpannableString errorMessage, SpannableString errorStatus) {
	mListView.setVisibility(View.GONE);
	mProgressBar.setVisibility(View.GONE);
	mEmptyMessage.setText(errorMessage);
	mEmptyMessage.setVisibility(View.VISIBLE);
	mStatus.setText(errorStatus);
	}

	private void setState(State state) {
	switch (state) {
	case STARTING:
	mStatus.setText(mLabels.mSearching);
	mListView.setVisibility(View.GONE);
	mProgressBar.setVisibility(View.VISIBLE);
	mEmptyMessage.setVisibility(View.GONE);
	break;
	case DISCOVERY_IDLE:
	boolean showEmptyMessage = mItemAdapter.isEmpty();
	mStatus.setText(showEmptyMessage
	? mLabels.mStatusIdleNoneFound : mLabels.mStatusIdleSomeFound);
	mEmptyMessage.setText(mLabels.mNoneFound);
	mEmptyMessage.setVisibility(showEmptyMessage ? View.VISIBLE : View.GONE);
	break;
	}
	}

	/**
	* Returns the dialog associated with this class. For use with tests only.
	*/
	@VisibleForTesting
	public Dialog getDialogForTesting() {
	return mDialog;
	}

	/**
	* Returns the ItemAdapter associated with this class. For use with tests only.
	*/
	@VisibleForTesting
	public ItemAdapter getItemAdapterForTesting() {
	return mItemAdapter;
	}
	}