core/java/android/content/ClipData.java - platform/frameworks/base - Git at Google

 /**
  * Copyright (c) 2010, 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.content;

 import android.content.res.AssetFileDescriptor;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.text.TextUtils;
 import android.util.Log;

 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.util.ArrayList;

 /**
  * Representation of a clipped data on the clipboard.
  *
  * <p>ClippedData is a complex type containing one or Item instances,
  * each of which can hold one or more representations of an item of data.
  * For display to the user, it also has a label and iconic representation.</p>
  *
  * <p>A ClipData contains a {@link ClipDescription}, which describes
  * important meta-data about the clip.  In particular, its
  * {@link ClipDescription#getMimeType(int) getDescription().getMimeType(int)}
  * must return correct MIME type(s) describing the data in the clip.  For help
  * in correctly constructing a clip with the correct MIME type, use
  * {@link #newPlainText(CharSequence, CharSequence)},
  * {@link #newUri(ContentResolver, CharSequence, Uri)}, and
  * {@link #newIntent(CharSequence, Intent)}.
  *
  * <p>Each Item instance can be one of three main classes of data: a simple
  * CharSequence of text, a single Intent object, or a Uri.  See {@link Item}
  * for more details.
  *
  * <div class="special reference">
  * <h3>Developer Guides</h3>
  * <p>For more information about using the clipboard framework, read the
  * <a href="{@docRoot}guide/topics/clipboard/copy-paste.html">Copy and Paste</a>
  * developer guide.</p>
  * </div>
  *
  * <a name="ImplementingPaste"></a>
  * <h3>Implementing Paste or Drop</h3>
  *
  * <p>To implement a paste or drop of a ClippedData object into an application,
  * the application must correctly interpret the data for its use.  If the {@link Item}
  * it contains is simple text or an Intent, there is little to be done: text
  * can only be interpreted as text, and an Intent will typically be used for
  * creating shortcuts (such as placing icons on the home screen) or other
  * actions.
  *
  * <p>If all you want is the textual representation of the clipped data, you
  * can use the convenience method {@link Item#coerceToText Item.coerceToText}.
  * In this case there is generally no need to worry about the MIME types
  * reported by {@link ClipDescription#getMimeType(int) getDescription().getMimeType(int)},
  * since any clip item an always be converted to a string.
  *
  * <p>More complicated exchanges will be done through URIs, in particular
  * "content:" URIs.  A content URI allows the recipient of a ClippedData item
  * to interact closely with the ContentProvider holding the data in order to
  * negotiate the transfer of that data.  The clip must also be filled in with
  * the available MIME types; {@link #newUri(ContentResolver, CharSequence, Uri)}
  * will take care of correctly doing this.
  *
  * <p>For example, here is the paste function of a simple NotePad application.
  * When retrieving the data from the clipboard, it can do either two things:
  * if the clipboard contains a URI reference to an existing note, it copies
  * the entire structure of the note into a new note; otherwise, it simply
  * coerces the clip into text and uses that as the new note's contents.
  *
  * {@sample development/samples/NotePad/src/com/example/android/notepad/NoteEditor.java
  *      paste}
  *
  * <p>In many cases an application can paste various types of streams of data.  For
  * example, an e-mail application may want to allow the user to paste an image
  * or other binary data as an attachment.  This is accomplished through the
  * ContentResolver {@link ContentResolver#getStreamTypes(Uri, String)} and
  * {@link ContentResolver#openTypedAssetFileDescriptor(Uri, String, android.os.Bundle)}
  * methods.  These allow a client to discover the type(s) of data that a particular
  * content URI can make available as a stream and retrieve the stream of data.
  *
  * <p>For example, the implementation of {@link Item#coerceToText Item.coerceToText}
  * itself uses this to try to retrieve a URI clip as a stream of text:
  *
  * {@sample frameworks/base/core/java/android/content/ClipData.java coerceToText}
  *
  * <a name="ImplementingCopy"></a>
  * <h3>Implementing Copy or Drag</h3>
  *
  * <p>To be the source of a clip, the application must construct a ClippedData
  * object that any recipient can interpret best for their context.  If the clip
  * is to contain a simple text, Intent, or URI, this is easy: an {@link Item}
  * containing the appropriate data type can be constructed and used.
  *
  * <p>More complicated data types require the implementation of support in
  * a ContentProvider for describing and generating the data for the recipient.
  * A common scenario is one where an application places on the clipboard the
  * content: URI of an object that the user has copied, with the data at that
  * URI consisting of a complicated structure that only other applications with
  * direct knowledge of the structure can use.
  *
  * <p>For applications that do not have intrinsic knowledge of the data structure,
  * the content provider holding it can make the data available as an arbitrary
  * number of types of data streams.  This is done by implementing the
  * ContentProvider {@link ContentProvider#getStreamTypes(Uri, String)} and
  * {@link ContentProvider#openTypedAssetFile(Uri, String, android.os.Bundle)}
  * methods.
  *
  * <p>Going back to our simple NotePad application, this is the implementation
  * it may have to convert a single note URI (consisting of a title and the note
  * text) into a stream of plain text data.
  *
  * {@sample development/samples/NotePad/src/com/example/android/notepad/NotePadProvider.java
  *      stream}
  *
  * <p>The copy operation in our NotePad application is now just a simple matter
  * of making a clip containing the URI of the note being copied:
  *
  * {@sample development/samples/NotePad/src/com/example/android/notepad/NotesList.java
  *      copy}
  *
  * <p>Note if a paste operation needs this clip as text (for example to paste
  * into an editor), then {@link Item#coerceToText(Context)} will ask the content
  * provider for the clip URI as text and successfully paste the entire note.
  */
 public class ClipData implements Parcelable {
     static final String[] MIMETYPES_TEXT_PLAIN = new String[] {
         ClipDescription.MIMETYPE_TEXT_PLAIN };
     static final String[] MIMETYPES_TEXT_URILIST = new String[] {
         ClipDescription.MIMETYPE_TEXT_URILIST };
     static final String[] MIMETYPES_TEXT_INTENT = new String[] {
         ClipDescription.MIMETYPE_TEXT_INTENT };

     final ClipDescription mClipDescription;

     final Bitmap mIcon;

     final ArrayList<Item> mItems = new ArrayList<Item>();

     /**
      * Description of a single item in a ClippedData.
      *
      * <p>The types than an individual item can currently contain are:</p>
      *
      * <ul>
      * <li> Text: a basic string of text.  This is actually a CharSequence,
      * so it can be formatted text supported by corresponding Android built-in
      * style spans.  (Custom application spans are not supported and will be
      * stripped when transporting through the clipboard.)
      * <li> Intent: an arbitrary Intent object.  A typical use is the shortcut
      * to create when pasting a clipped item on to the home screen.
      * <li> Uri: a URI reference.  This may be any URI (such as an http: URI
      * representing a bookmark), however it is often a content: URI.  Using
      * content provider references as clips like this allows an application to
      * share complex or large clips through the standard content provider
      * facilities.
      * </ul>
      */
     public static class Item {
         final CharSequence mText;
         final Intent mIntent;
         final Uri mUri;

         /**
          * Create an Item consisting of a single block of (possibly styled) text.
          */
         public Item(CharSequence text) {
             mText = text;
             mIntent = null;
             mUri = null;
         }

         /**
          * Create an Item consisting of an arbitrary Intent.
          */
         public Item(Intent intent) {
             mText = null;
             mIntent = intent;
             mUri = null;
         }

         /**
          * Create an Item consisting of an arbitrary URI.
          */
         public Item(Uri uri) {
             mText = null;
             mIntent = null;
             mUri = uri;
         }

         /**
          * Create a complex Item, containing multiple representations of
          * text, intent, and/or URI.
          */
         public Item(CharSequence text, Intent intent, Uri uri) {
             mText = text;
             mIntent = intent;
             mUri = uri;
         }

         /**
          * Retrieve the raw text contained in this Item.
          */
         public CharSequence getText() {
             return mText;
         }

         /**
          * Retrieve the raw Intent contained in this Item.
          */
         public Intent getIntent() {
             return mIntent;
         }

         /**
          * Retrieve the raw URI contained in this Item.
          */
         public Uri getUri() {
             return mUri;
         }

         /**
          * Turn this item into text, regardless of the type of data it
          * actually contains.
          *
          * <p>The algorithm for deciding what text to return is:
          * <ul>
          * <li> If {@link #getText} is non-null, return that.
          * <li> If {@link #getUri} is non-null, try to retrieve its data
          * as a text stream from its content provider.  If this succeeds, copy
          * the text into a String and return it.  If it is not a content: URI or
          * the content provider does not supply a text representation, return
          * the raw URI as a string.
          * <li> If {@link #getIntent} is non-null, convert that to an intent:
          * URI and returnit.
          * <li> Otherwise, return an empty string.
          * </ul>
          *
          * @param context The caller's Context, from which its ContentResolver
          * and other things can be retrieved.
          * @return Returns the item's textual representation.
          */
 //BEGIN_INCLUDE(coerceToText)
         public CharSequence coerceToText(Context context) {
             // If this Item has an explicit textual value, simply return that.
             if (mText != null) {
                 return mText;
             }

             // If this Item has a URI value, try using that.
             if (mUri != null) {

                 // First see if the URI can be opened as a plain text stream
                 // (of any sub-type).  If so, this is the best textual
                 // representation for it.
                 FileInputStream stream = null;
                 try {
                     // Ask for a stream of the desired type.
                     AssetFileDescriptor descr = context.getContentResolver()
                             .openTypedAssetFileDescriptor(mUri, "text/*", null);
                     stream = descr.createInputStream();
                     InputStreamReader reader = new InputStreamReader(stream, "UTF-8");

                     // Got it...  copy the stream into a local string and return it.
                     StringBuilder builder = new StringBuilder(128);
                     char[] buffer = new char[8192];
                     int len;
                     while ((len=reader.read(buffer)) > 0) {
                         builder.append(buffer, 0, len);
                     }
                     return builder.toString();

                 } catch (FileNotFoundException e) {
                     // Unable to open content URI as text...  not really an
                     // error, just something to ignore.

                 } catch (IOException e) {
                     // Something bad has happened.
                     Log.w("ClippedData", "Failure loading text", e);
                     return e.toString();

                 } finally {
                     if (stream != null) {
                         try {
                             stream.close();
                         } catch (IOException e) {
                         }
                     }
                 }

                 // If we couldn't open the URI as a stream, then the URI itself
                 // probably serves fairly well as a textual representation.
                 return mUri.toString();
             }

             // Finally, if all we have is an Intent, then we can just turn that
             // into text.  Not the most user-friendly thing, but it's something.
             if (mIntent != null) {
                 return mIntent.toUri(Intent.URI_INTENT_SCHEME);
             }

             // Shouldn't get here, but just in case...
             return "";
         }
 //END_INCLUDE(coerceToText)
     }

     /**
      * Create a new clip.
      *
      * @param label Label to show to the user describing this clip.
      * @param mimeTypes An array of MIME types this data is available as.
      * @param item The contents of the first item in the clip.
      */
     public ClipData(CharSequence label, String[] mimeTypes, Item item) {
         mClipDescription = new ClipDescription(label, mimeTypes);
         if (item == null) {
             throw new NullPointerException("item is null");
         }
         mIcon = null;
         mItems.add(item);
     }

     /**
      * Create a new clip.
      *
      * @param description The ClipDescription describing the clip contents.
      * @param item The contents of the first item in the clip.
      */
     public ClipData(ClipDescription description, Item item) {
         mClipDescription = description;
         if (item == null) {
             throw new NullPointerException("item is null");
         }
         mIcon = null;
         mItems.add(item);
     }

     /**
      * Create a new ClipData holding data of the type
      * {@link ClipDescription#MIMETYPE_TEXT_PLAIN}.
      *
      * @param label User-visible label for the clip data.
      * @param text The actual text in the clip.
      * @return Returns a new ClipData containing the specified data.
      */
     static public ClipData newPlainText(CharSequence label, CharSequence text) {
         Item item = new Item(text);
         return new ClipData(label, MIMETYPES_TEXT_PLAIN, item);
     }

     /**
      * Create a new ClipData holding an Intent with MIME type
      * {@link ClipDescription#MIMETYPE_TEXT_INTENT}.
      *
      * @param label User-visible label for the clip data.
      * @param intent The actual Intent in the clip.
      * @return Returns a new ClipData containing the specified data.
      */
     static public ClipData newIntent(CharSequence label, Intent intent) {
         Item item = new Item(intent);
         return new ClipData(label, MIMETYPES_TEXT_INTENT, item);
     }

     /**
      * Create a new ClipData holding a URI.  If the URI is a content: URI,
      * this will query the content provider for the MIME type of its data and
      * use that as the MIME type.  Otherwise, it will use the MIME type
      * {@link ClipDescription#MIMETYPE_TEXT_URILIST}.
      *
      * @param resolver ContentResolver used to get information about the URI.
      * @param label User-visible label for the clip data.
      * @param uri The URI in the clip.
      * @return Returns a new ClipData containing the specified data.
      */
     static public ClipData newUri(ContentResolver resolver, CharSequence label,
             Uri uri) {
         Item item = new Item(uri);
         String[] mimeTypes = null;
         if ("content".equals(uri.getScheme())) {
             String realType = resolver.getType(uri);
             mimeTypes = resolver.getStreamTypes(uri, "*/*");
             if (mimeTypes == null) {
                 if (realType != null) {
                     mimeTypes = new String[] { realType, ClipDescription.MIMETYPE_TEXT_URILIST };
                 }
             } else {
                 String[] tmp = new String[mimeTypes.length + (realType != null ? 2 : 1)];
                 int i = 0;
                 if (realType != null) {
                     tmp[0] = realType;
                     i++;
                 }
                 System.arraycopy(mimeTypes, 0, tmp, i, mimeTypes.length);
                 tmp[i + mimeTypes.length] = ClipDescription.MIMETYPE_TEXT_URILIST;
                 mimeTypes = tmp;
             }
         }
         if (mimeTypes == null) {
             mimeTypes = MIMETYPES_TEXT_URILIST;
         }
         return new ClipData(label, mimeTypes, item);
     }

     /**
      * Create a new ClipData holding an URI with MIME type
      * {@link ClipDescription#MIMETYPE_TEXT_URILIST}.
      * Unlike {@link #newUri(ContentResolver, CharSequence, Uri)}, nothing
      * is inferred about the URI -- if it is a content: URI holding a bitmap,
      * the reported type will still be uri-list.  Use this with care!
      *
      * @param label User-visible label for the clip data.
      * @param uri The URI in the clip.
      * @return Returns a new ClipData containing the specified data.
      */
     static public ClipData newRawUri(CharSequence label, Uri uri) {
         Item item = new Item(uri);
         return new ClipData(label, MIMETYPES_TEXT_URILIST, item);
     }

     /**
      * Return the {@link ClipDescription} associated with this data, describing
      * what it contains.
      */
     public ClipDescription getDescription() {
         return mClipDescription;
     }

     /**
      * Add a new Item to the overall ClipData container.
      */
     public void addItem(Item item) {
         if (item == null) {
             throw new NullPointerException("item is null");
         }
         mItems.add(item);
     }

     /** @hide */
     public Bitmap getIcon() {
         return mIcon;
     }

     /**
      * Return the number of items in the clip data.
      */
     public int getItemCount() {
         return mItems.size();
     }

     /**
      * Return a single item inside of the clip data.  The index can range
      * from 0 to {@link #getItemCount()}-1.
      */
     public Item getItemAt(int index) {
         return mItems.get(index);
     }

     @Override
     public int describeContents() {
         return 0;
     }

     @Override
     public void writeToParcel(Parcel dest, int flags) {
         mClipDescription.writeToParcel(dest, flags);
         if (mIcon != null) {
             dest.writeInt(1);
             mIcon.writeToParcel(dest, flags);
         } else {
             dest.writeInt(0);
         }
         final int N = mItems.size();
         dest.writeInt(N);
         for (int i=0; i<N; i++) {
             Item item = mItems.get(i);
             TextUtils.writeToParcel(item.mText, dest, flags);
             if (item.mIntent != null) {
                 dest.writeInt(1);
                 item.mIntent.writeToParcel(dest, flags);
             } else {
                 dest.writeInt(0);
             }
             if (item.mUri != null) {
                 dest.writeInt(1);
                 item.mUri.writeToParcel(dest, flags);
             } else {
                 dest.writeInt(0);
             }
         }
     }

     ClipData(Parcel in) {
         mClipDescription = new ClipDescription(in);
         if (in.readInt() != 0) {
             mIcon = Bitmap.CREATOR.createFromParcel(in);
         } else {
             mIcon = null;
         }
         final int N = in.readInt();
         for (int i=0; i<N; i++) {
             CharSequence text = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(in);
             Intent intent = in.readInt() != 0 ? Intent.CREATOR.createFromParcel(in) : null;
             Uri uri = in.readInt() != 0 ? Uri.CREATOR.createFromParcel(in) : null;
             mItems.add(new Item(text, intent, uri));
         }
     }

     public static final Parcelable.Creator<ClipData> CREATOR =
         new Parcelable.Creator<ClipData>() {

             public ClipData createFromParcel(Parcel source) {
                 return new ClipData(source);
             }

             public ClipData[] newArray(int size) {
                 return new ClipData[size];
             }
         };
 }
	/**
	* Copyright (c) 2010, 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.content;

	import android.content.res.AssetFileDescriptor;
	import android.graphics.Bitmap;
	import android.net.Uri;
	import android.os.Parcel;
	import android.os.Parcelable;
	import android.text.TextUtils;
	import android.util.Log;

	import java.io.FileInputStream;
	import java.io.FileNotFoundException;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.util.ArrayList;

	/**
	* Representation of a clipped data on the clipboard.
	*
	* <p>ClippedData is a complex type containing one or Item instances,
	* each of which can hold one or more representations of an item of data.
	* For display to the user, it also has a label and iconic representation.</p>
	*
	* <p>A ClipData contains a {@link ClipDescription}, which describes
	* important meta-data about the clip. In particular, its
	* {@link ClipDescription#getMimeType(int) getDescription().getMimeType(int)}
	* must return correct MIME type(s) describing the data in the clip. For help
	* in correctly constructing a clip with the correct MIME type, use
	* {@link #newPlainText(CharSequence, CharSequence)},
	* {@link #newUri(ContentResolver, CharSequence, Uri)}, and
	* {@link #newIntent(CharSequence, Intent)}.
	*
	* <p>Each Item instance can be one of three main classes of data: a simple
	* CharSequence of text, a single Intent object, or a Uri. See {@link Item}
	* for more details.
	*
	* <div class="special reference">
	* <h3>Developer Guides</h3>
	* <p>For more information about using the clipboard framework, read the
	* <a href="{@docRoot}guide/topics/clipboard/copy-paste.html">Copy and Paste</a>
	* developer guide.</p>
	* </div>
	*
	* <a name="ImplementingPaste"></a>
	* <h3>Implementing Paste or Drop</h3>
	*
	* <p>To implement a paste or drop of a ClippedData object into an application,
	* the application must correctly interpret the data for its use. If the {@link Item}
	* it contains is simple text or an Intent, there is little to be done: text
	* can only be interpreted as text, and an Intent will typically be used for
	* creating shortcuts (such as placing icons on the home screen) or other
	* actions.
	*
	* <p>If all you want is the textual representation of the clipped data, you
	* can use the convenience method {@link Item#coerceToText Item.coerceToText}.
	* In this case there is generally no need to worry about the MIME types
	* reported by {@link ClipDescription#getMimeType(int) getDescription().getMimeType(int)},
	* since any clip item an always be converted to a string.
	*
	* <p>More complicated exchanges will be done through URIs, in particular
	* "content:" URIs. A content URI allows the recipient of a ClippedData item
	* to interact closely with the ContentProvider holding the data in order to
	* negotiate the transfer of that data. The clip must also be filled in with
	* the available MIME types; {@link #newUri(ContentResolver, CharSequence, Uri)}
	* will take care of correctly doing this.
	*
	* <p>For example, here is the paste function of a simple NotePad application.
	* When retrieving the data from the clipboard, it can do either two things:
	* if the clipboard contains a URI reference to an existing note, it copies
	* the entire structure of the note into a new note; otherwise, it simply
	* coerces the clip into text and uses that as the new note's contents.
	*
	* {@sample development/samples/NotePad/src/com/example/android/notepad/NoteEditor.java
	* paste}
	*
	* <p>In many cases an application can paste various types of streams of data. For
	* example, an e-mail application may want to allow the user to paste an image
	* or other binary data as an attachment. This is accomplished through the
	* ContentResolver {@link ContentResolver#getStreamTypes(Uri, String)} and
	* {@link ContentResolver#openTypedAssetFileDescriptor(Uri, String, android.os.Bundle)}
	* methods. These allow a client to discover the type(s) of data that a particular
	* content URI can make available as a stream and retrieve the stream of data.
	*
	* <p>For example, the implementation of {@link Item#coerceToText Item.coerceToText}
	* itself uses this to try to retrieve a URI clip as a stream of text:
	*
	* {@sample frameworks/base/core/java/android/content/ClipData.java coerceToText}
	*
	* <a name="ImplementingCopy"></a>
	* <h3>Implementing Copy or Drag</h3>
	*
	* <p>To be the source of a clip, the application must construct a ClippedData
	* object that any recipient can interpret best for their context. If the clip
	* is to contain a simple text, Intent, or URI, this is easy: an {@link Item}
	* containing the appropriate data type can be constructed and used.
	*
	* <p>More complicated data types require the implementation of support in
	* a ContentProvider for describing and generating the data for the recipient.
	* A common scenario is one where an application places on the clipboard the
	* content: URI of an object that the user has copied, with the data at that
	* URI consisting of a complicated structure that only other applications with
	* direct knowledge of the structure can use.
	*
	* <p>For applications that do not have intrinsic knowledge of the data structure,
	* the content provider holding it can make the data available as an arbitrary
	* number of types of data streams. This is done by implementing the
	* ContentProvider {@link ContentProvider#getStreamTypes(Uri, String)} and
	* {@link ContentProvider#openTypedAssetFile(Uri, String, android.os.Bundle)}
	* methods.
	*
	* <p>Going back to our simple NotePad application, this is the implementation
	* it may have to convert a single note URI (consisting of a title and the note
	* text) into a stream of plain text data.
	*
	* {@sample development/samples/NotePad/src/com/example/android/notepad/NotePadProvider.java
	* stream}
	*
	* <p>The copy operation in our NotePad application is now just a simple matter
	* of making a clip containing the URI of the note being copied:
	*
	* {@sample development/samples/NotePad/src/com/example/android/notepad/NotesList.java
	* copy}
	*
	* <p>Note if a paste operation needs this clip as text (for example to paste
	* into an editor), then {@link Item#coerceToText(Context)} will ask the content
	* provider for the clip URI as text and successfully paste the entire note.
	*/
	public class ClipData implements Parcelable {
	static final String[] MIMETYPES_TEXT_PLAIN = new String[] {
	ClipDescription.MIMETYPE_TEXT_PLAIN };
	static final String[] MIMETYPES_TEXT_URILIST = new String[] {
	ClipDescription.MIMETYPE_TEXT_URILIST };
	static final String[] MIMETYPES_TEXT_INTENT = new String[] {
	ClipDescription.MIMETYPE_TEXT_INTENT };

	final ClipDescription mClipDescription;

	final Bitmap mIcon;

	final ArrayList<Item> mItems = new ArrayList<Item>();

	/**
	* Description of a single item in a ClippedData.
	*
	* <p>The types than an individual item can currently contain are:</p>
	*
	* <ul>
	* <li> Text: a basic string of text. This is actually a CharSequence,
	* so it can be formatted text supported by corresponding Android built-in
	* style spans. (Custom application spans are not supported and will be
	* stripped when transporting through the clipboard.)
	* <li> Intent: an arbitrary Intent object. A typical use is the shortcut
	* to create when pasting a clipped item on to the home screen.
	* <li> Uri: a URI reference. This may be any URI (such as an http: URI
	* representing a bookmark), however it is often a content: URI. Using
	* content provider references as clips like this allows an application to
	* share complex or large clips through the standard content provider
	* facilities.
	* </ul>
	*/
	public static class Item {
	final CharSequence mText;
	final Intent mIntent;
	final Uri mUri;

	/**
	* Create an Item consisting of a single block of (possibly styled) text.
	*/
	public Item(CharSequence text) {
	mText = text;
	mIntent = null;
	mUri = null;
	}

	/**
	* Create an Item consisting of an arbitrary Intent.
	*/
	public Item(Intent intent) {
	mText = null;
	mIntent = intent;
	mUri = null;
	}

	/**
	* Create an Item consisting of an arbitrary URI.
	*/
	public Item(Uri uri) {
	mText = null;
	mIntent = null;
	mUri = uri;
	}

	/**
	* Create a complex Item, containing multiple representations of
	* text, intent, and/or URI.
	*/
	public Item(CharSequence text, Intent intent, Uri uri) {
	mText = text;
	mIntent = intent;
	mUri = uri;
	}

	/**
	* Retrieve the raw text contained in this Item.
	*/
	public CharSequence getText() {
	return mText;
	}

	/**
	* Retrieve the raw Intent contained in this Item.
	*/
	public Intent getIntent() {
	return mIntent;
	}

	/**
	* Retrieve the raw URI contained in this Item.
	*/
	public Uri getUri() {
	return mUri;
	}

	/**
	* Turn this item into text, regardless of the type of data it
	* actually contains.
	*
	* <p>The algorithm for deciding what text to return is:
	* <ul>
	* <li> If {@link #getText} is non-null, return that.
	* <li> If {@link #getUri} is non-null, try to retrieve its data
	* as a text stream from its content provider. If this succeeds, copy
	* the text into a String and return it. If it is not a content: URI or
	* the content provider does not supply a text representation, return
	* the raw URI as a string.
	* <li> If {@link #getIntent} is non-null, convert that to an intent:
	* URI and returnit.
	* <li> Otherwise, return an empty string.
	* </ul>
	*
	* @param context The caller's Context, from which its ContentResolver
	* and other things can be retrieved.
	* @return Returns the item's textual representation.
	*/
	//BEGIN_INCLUDE(coerceToText)
	public CharSequence coerceToText(Context context) {
	// If this Item has an explicit textual value, simply return that.
	if (mText != null) {
	return mText;
	}

	// If this Item has a URI value, try using that.
	if (mUri != null) {

	// First see if the URI can be opened as a plain text stream
	// (of any sub-type). If so, this is the best textual
	// representation for it.
	FileInputStream stream = null;
	try {
	// Ask for a stream of the desired type.
	AssetFileDescriptor descr = context.getContentResolver()
	.openTypedAssetFileDescriptor(mUri, "text/*", null);
	stream = descr.createInputStream();
	InputStreamReader reader = new InputStreamReader(stream, "UTF-8");

	// Got it... copy the stream into a local string and return it.
	StringBuilder builder = new StringBuilder(128);
	char[] buffer = new char[8192];
	int len;
	while ((len=reader.read(buffer)) > 0) {
	builder.append(buffer, 0, len);
	}
	return builder.toString();

	} catch (FileNotFoundException e) {
	// Unable to open content URI as text... not really an
	// error, just something to ignore.

	} catch (IOException e) {
	// Something bad has happened.
	Log.w("ClippedData", "Failure loading text", e);
	return e.toString();

	} finally {
	if (stream != null) {
	try {
	stream.close();
	} catch (IOException e) {
	}
	}
	}

	// If we couldn't open the URI as a stream, then the URI itself
	// probably serves fairly well as a textual representation.
	return mUri.toString();
	}

	// Finally, if all we have is an Intent, then we can just turn that
	// into text. Not the most user-friendly thing, but it's something.
	if (mIntent != null) {
	return mIntent.toUri(Intent.URI_INTENT_SCHEME);
	}

	// Shouldn't get here, but just in case...
	return "";
	}
	//END_INCLUDE(coerceToText)
	}

	/**
	* Create a new clip.
	*
	* @param label Label to show to the user describing this clip.
	* @param mimeTypes An array of MIME types this data is available as.
	* @param item The contents of the first item in the clip.
	*/
	public ClipData(CharSequence label, String[] mimeTypes, Item item) {
	mClipDescription = new ClipDescription(label, mimeTypes);
	if (item == null) {
	throw new NullPointerException("item is null");
	}
	mIcon = null;
	mItems.add(item);
	}

	/**
	* Create a new clip.
	*
	* @param description The ClipDescription describing the clip contents.
	* @param item The contents of the first item in the clip.
	*/
	public ClipData(ClipDescription description, Item item) {
	mClipDescription = description;
	if (item == null) {
	throw new NullPointerException("item is null");
	}
	mIcon = null;
	mItems.add(item);
	}

	/**
	* Create a new ClipData holding data of the type
	* {@link ClipDescription#MIMETYPE_TEXT_PLAIN}.
	*
	* @param label User-visible label for the clip data.
	* @param text The actual text in the clip.
	* @return Returns a new ClipData containing the specified data.
	*/
	static public ClipData newPlainText(CharSequence label, CharSequence text) {
	Item item = new Item(text);
	return new ClipData(label, MIMETYPES_TEXT_PLAIN, item);
	}

	/**
	* Create a new ClipData holding an Intent with MIME type
	* {@link ClipDescription#MIMETYPE_TEXT_INTENT}.
	*
	* @param label User-visible label for the clip data.
	* @param intent The actual Intent in the clip.
	* @return Returns a new ClipData containing the specified data.
	*/
	static public ClipData newIntent(CharSequence label, Intent intent) {
	Item item = new Item(intent);
	return new ClipData(label, MIMETYPES_TEXT_INTENT, item);
	}

	/**
	* Create a new ClipData holding a URI. If the URI is a content: URI,
	* this will query the content provider for the MIME type of its data and
	* use that as the MIME type. Otherwise, it will use the MIME type
	* {@link ClipDescription#MIMETYPE_TEXT_URILIST}.
	*
	* @param resolver ContentResolver used to get information about the URI.
	* @param label User-visible label for the clip data.
	* @param uri The URI in the clip.
	* @return Returns a new ClipData containing the specified data.
	*/
	static public ClipData newUri(ContentResolver resolver, CharSequence label,
	Uri uri) {
	Item item = new Item(uri);
	String[] mimeTypes = null;
	if ("content".equals(uri.getScheme())) {
	String realType = resolver.getType(uri);
	mimeTypes = resolver.getStreamTypes(uri, "/");
	if (mimeTypes == null) {
	if (realType != null) {
	mimeTypes = new String[] { realType, ClipDescription.MIMETYPE_TEXT_URILIST };
	}
	} else {
	String[] tmp = new String[mimeTypes.length + (realType != null ? 2 : 1)];
	int i = 0;
	if (realType != null) {
	tmp[0] = realType;
	i++;
	}
	System.arraycopy(mimeTypes, 0, tmp, i, mimeTypes.length);
	tmp[i + mimeTypes.length] = ClipDescription.MIMETYPE_TEXT_URILIST;
	mimeTypes = tmp;
	}
	}
	if (mimeTypes == null) {
	mimeTypes = MIMETYPES_TEXT_URILIST;
	}
	return new ClipData(label, mimeTypes, item);
	}

	/**
	* Create a new ClipData holding an URI with MIME type
	* {@link ClipDescription#MIMETYPE_TEXT_URILIST}.
	* Unlike {@link #newUri(ContentResolver, CharSequence, Uri)}, nothing
	* is inferred about the URI -- if it is a content: URI holding a bitmap,
	* the reported type will still be uri-list. Use this with care!
	*
	* @param label User-visible label for the clip data.
	* @param uri The URI in the clip.
	* @return Returns a new ClipData containing the specified data.
	*/
	static public ClipData newRawUri(CharSequence label, Uri uri) {
	Item item = new Item(uri);
	return new ClipData(label, MIMETYPES_TEXT_URILIST, item);
	}

	/**
	* Return the {@link ClipDescription} associated with this data, describing
	* what it contains.
	*/
	public ClipDescription getDescription() {
	return mClipDescription;
	}

	/**
	* Add a new Item to the overall ClipData container.
	*/
	public void addItem(Item item) {
	if (item == null) {
	throw new NullPointerException("item is null");
	}
	mItems.add(item);
	}

	/** @hide */
	public Bitmap getIcon() {
	return mIcon;
	}

	/**
	* Return the number of items in the clip data.
	*/
	public int getItemCount() {
	return mItems.size();
	}

	/**
	* Return a single item inside of the clip data. The index can range
	* from 0 to {@link #getItemCount()}-1.
	*/
	public Item getItemAt(int index) {
	return mItems.get(index);
	}

	@Override
	public int describeContents() {
	return 0;
	}

	@Override
	public void writeToParcel(Parcel dest, int flags) {
	mClipDescription.writeToParcel(dest, flags);
	if (mIcon != null) {
	dest.writeInt(1);
	mIcon.writeToParcel(dest, flags);
	} else {
	dest.writeInt(0);
	}
	final int N = mItems.size();
	dest.writeInt(N);
	for (int i=0; i<N; i++) {
	Item item = mItems.get(i);
	TextUtils.writeToParcel(item.mText, dest, flags);
	if (item.mIntent != null) {
	dest.writeInt(1);
	item.mIntent.writeToParcel(dest, flags);
	} else {
	dest.writeInt(0);
	}
	if (item.mUri != null) {
	dest.writeInt(1);
	item.mUri.writeToParcel(dest, flags);
	} else {
	dest.writeInt(0);
	}
	}
	}

	ClipData(Parcel in) {
	mClipDescription = new ClipDescription(in);
	if (in.readInt() != 0) {
	mIcon = Bitmap.CREATOR.createFromParcel(in);
	} else {
	mIcon = null;
	}
	final int N = in.readInt();
	for (int i=0; i<N; i++) {
	CharSequence text = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(in);
	Intent intent = in.readInt() != 0 ? Intent.CREATOR.createFromParcel(in) : null;
	Uri uri = in.readInt() != 0 ? Uri.CREATOR.createFromParcel(in) : null;
	mItems.add(new Item(text, intent, uri));
	}
	}

	public static final Parcelable.Creator<ClipData> CREATOR =
	new Parcelable.Creator<ClipData>() {

	public ClipData createFromParcel(Parcel source) {
	return new ClipData(source);
	}

	public ClipData[] newArray(int size) {
	return new ClipData[size];
	}
	};
	}