Android(安卓)视频缩略图之MediaMetadataRetriever

参考： http://www.ophonesdn.com/forum/thread-2973-1-1.html
http://topic.csdn.net/u/20100315/10/2726b427-ca14-4e06-bd44-a6a351f8c52a.html
http://www.pin5i.com/showtopic-android-generate-thumbnails-for-multimedia-files.html
1、
2.2之后获得缩略图就简单了因为用了ThumbnailUtils类，可以

Bitmap  b = ThumbnailUtils.createVideoThumbnail(path,Video.Thumbnails.MICRO_KIND);ImageView iv = new ImageView(this);

参见： http://lipeng88213.iteye.com/blog/835183

2、
但是2.2之前呢这个问题就比较郁闷了查了查资料
其实我们可以用MediaMetadataRetriever这个类

但是里面有个问题
1.0之后这个类被隐藏了貌似2.3之后这个类又出现了吧

隐藏了。。。。那怎么办呢？别慌我们自有办法步骤如下：

一、找到MediaMetadataRetriever的源码复制到你的工程里面去

切忌：包名必须与MediaMetadataRetriever本身在系统里面的包名一样，也就是包名必须为android.media
二、找到so文件新建一个和src同级别的libs文件夹把so文件复制进去这个so文件的名字大概为libmedia_jni.so
可能有人要问如何获得so文件呢方法有两个
A：如果你有android的系统源码你直接可以搜索libmedia_jni.so 就能得到

B：在androidsdk目录——tools——ddms.bat 启动ddms

Device——File Explore
打开一个文件浏览器

system——lib——libmedia_jni.so

三、
这样之后你就可以用MediaMetadataRetriever类了

MediaMetadataRetriever主要有两个功能：MODE_GET_METADATA_ONLY和MODE_CAPTURE_FRAME_ONLY

mode为MODE_CAPTURE_FRAME_ONLY时
调用captureFrame取得一帧。
mode为MODE_GET_METADATA_ONLY时
extractMetadata 提取文件信息，ARTIST、DATE、YEAR、DURATION、RATING、FRAME_RATE、VIDEO_FORMAT 可以得到时长等信息
和extractAlbumArt 提取专辑信息，这个下面的音乐文件可以用到。

代码如下：
获得缩略图

private Bitmap createVideoThumbnail(String filePath) {        Bitmap bitmap = null;        android.media.MediaMetadataRetriever retriever = new android.media.MediaMetadataRetriever();                try {            retriever.setMode(android.media.MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);            retriever.setDataSource(filePath);            bitmap = retriever.captureFrame();        } catch(IllegalArgumentException ex) {            // Assume this is a corrupt video file        } catch (RuntimeException ex) {            // Assume this is a corrupt video file.        } finally {            try {                retriever.release();            } catch (RuntimeException ex) {                // Ignore failures while cleaning up.            }        }        return bitmap;    }

获得时长

private String ttt(String filePath){    android.media.MediaMetadataRetriever retriever = new android.media.MediaMetadataRetriever();    retriever.setMode(android.media.MediaMetadataRetriever.MODE_GET_METADATA_ONLY);    retriever.setDataSource(filePath);    String str = retriever.extractMetadata(android.media.MediaMetadataRetriever.METADATA_KEY_DURATION);        System.out.println(str +"  =====");        return str;    }

下面是转载的另一篇

获取SD卡视频文件缩略图

private Bitmap createVideoThumbnail(String filePath) {        Bitmap bitmap = null;        MediaMetadataRetriever retriever = new MediaMetadataRetriever();        try {            retriever.setMode(MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);            retriever.setDataSource(filePath);            bitmap = retriever.captureFrame();        } catch(IllegalArgumentException ex) {            // Assume this is a corrupt video file        } catch (RuntimeException ex) {            // Assume this is a corrupt video file.        } finally {            try {                retriever.release();            } catch (RuntimeException ex) {                // Ignore failures while cleaning up.            }        }        return bitmap;    }   private void getVideoFile(final List list){  Bitmap bitmap = null;    ContentResolver mContentResolver = this.getContentResolver();        Cursor cursor = mContentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null,                  null, null, MediaStore.Video.DEFAULT_SORT_ORDER);                                if (cursor.moveToFirst())        {            do {                //ID：MediaStore.Audio.Media._ID                int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));                                    //名称 ：MediaStore.Audio.Media.TITLE                String tilte = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));                                    //专辑名：MediaStore.Audio.Media.ALBUM                String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.ALBUM));                                                      //歌手名： MediaStore.Audio.Media.ARTIST                String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.ARTIST));                                    //路径 ：MediaStore.Audio.Media.DATA                String url = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));                                    //总播放时长 ：MediaStore.Audio.Media.DURATION                int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));                                    //大小 ：MediaStore.Audio.Media.SIZE                int size = (int)cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE));                               //拍摄时间                int dateTaken = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATE_TAKEN));                String datetime = DateFormat.format("yyyy-MM-dd kk:mm:ss", dateTaken).toString();                                              bitmap = createVideoThumbnail(url);   }

MediaMetadataRetriever.java
应放在工程的：
android.media 下面

跟上 MediaMetadataRetriever 类：

/** Copyright (C) 2008 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.media;import android.content.ContentResolver;import android.content.Context;import android.content.res.AssetFileDescriptor;import android.graphics.Bitmap;import android.net.Uri;import android.os.ParcelFileDescriptor;import java.io.FileDescriptor;import java.io.IOException;import java.io.FileNotFoundException;/*** MediaMetadataRetriever class provides a unified interface for retrieving* frame and meta data from an input media file.* {@hide}*/public class MediaMetadataRetriever{    static {        System.loadLibrary("media_jni");    }    // The field below is accessed by native methods    @SuppressWarnings("unused")    private int mNativeContext;    public MediaMetadataRetriever() {        native_setup();    }    /**     * Call this method before setDataSource() so that the mode becomes     * effective for subsequent operations. This method can be called only once     * at the beginning if the intended mode of operation for a     * MediaMetadataRetriever object remains the same for its whole lifetime,     * and thus it is unnecessary to call this method each time setDataSource()     * is called. If this is not never called (which is allowed), by default the     * intended mode of operation is to both capture frame and retrieve meta     * data (i.e., MODE_GET_METADATA_ONLY | MODE_CAPTURE_FRAME_ONLY).     * Often, this may not be what one wants, since doing this has negative     * performance impact on execution time of a call to setDataSource(), since     * both types of operations may be time consuming.     *     * @param mode The intended mode of operation. Can be any combination of     * MODE_GET_METADATA_ONLY and MODE_CAPTURE_FRAME_ONLY:     * 1. MODE_GET_METADATA_ONLY & MODE_CAPTURE_FRAME_ONLY:     *    For neither frame capture nor meta data retrieval     * 2. MODE_GET_METADATA_ONLY: For meta data retrieval only     * 3. MODE_CAPTURE_FRAME_ONLY: For frame capture only     * 4. MODE_GET_METADATA_ONLY | MODE_CAPTURE_FRAME_ONLY:     *    For both frame capture and meta data retrieval     */    public native void setMode(int mode);       /**     * @return the current mode of operation. A negative return value indicates     * some runtime error has occurred.     */    public native int getMode();    /**     * Sets the data source (file pathname) to use. Call this     * method before the rest of the methods in this class. This method may be     * time-consuming.     *     * @param path The path of the input media file.     * @throws IllegalArgumentException If the path is invalid.     */    public native void setDataSource(String path) throws IllegalArgumentException;       /**     * Sets the data source (FileDescriptor) to use.  It is the caller's     * responsibility to close the file descriptor. It is safe to do so as soon     * as this call returns. Call this method before the rest of the methods in     * this class. This method may be time-consuming.     *     * @param fd the FileDescriptor for the file you want to play     * @param offset the offset into the file where the data to be played starts,     * in bytes. It must be non-negative     * @param length the length in bytes of the data to be played. It must be     * non-negative.     * @throws IllegalArgumentException if the arguments are invalid     */    public native void setDataSource(FileDescriptor fd, long offset, long length)            throws IllegalArgumentException;       /**     * Sets the data source (FileDescriptor) to use. It is the caller's     * responsibility to close the file descriptor. It is safe to do so as soon     * as this call returns. Call this method before the rest of the methods in     * this class. This method may be time-consuming.     *     * @param fd the FileDescriptor for the file you want to play     * @throws IllegalArgumentException if the FileDescriptor is invalid     */    public void setDataSource(FileDescriptor fd)            throws IllegalArgumentException {        // intentionally less than LONG_MAX        setDataSource(fd, 0, 0x7ffffffffffffffL);    }       /**     * Sets the data source as a content Uri. Call this method before     * the rest of the methods in this class. This method may be time-consuming.     *     * @param context the Context to use when resolving the Uri     * @param uri the Content URI of the data you want to play     * @throws IllegalArgumentException if the Uri is invalid     * @throws SecurityException if the Uri cannot be used due to lack of     * permission.     */    public void setDataSource(Context context, Uri uri)        throws IllegalArgumentException, SecurityException {        if (uri == null) {            throw new IllegalArgumentException();        }                String scheme = uri.getScheme();        if(scheme == null || scheme.equals("file")) {            setDataSource(uri.getPath());            return;        }        AssetFileDescriptor fd = null;        try {            ContentResolver resolver = context.getContentResolver();            try {                fd = resolver.openAssetFileDescriptor(uri, "r");            } catch(FileNotFoundException e) {                throw new IllegalArgumentException();            }            if (fd == null) {                throw new IllegalArgumentException();            }            FileDescriptor descriptor = fd.getFileDescriptor();            if (!descriptor.valid()) {                throw new IllegalArgumentException();            }            // Note: using getDeclaredLength so that our behavior is the same            // as previous versions when the content provider is returning            // a full file.            if (fd.getDeclaredLength() < 0) {                setDataSource(descriptor);            } else {                setDataSource(descriptor, fd.getStartOffset(), fd.getDeclaredLength());            }            return;        } catch (SecurityException ex) {        } finally {            try {                if (fd != null) {                    fd.close();                }            } catch(IOException ioEx) {            }        }        setDataSource(uri.toString());    }    /**     * Call this method after setDataSource(). This method retrieves the     * meta data value associated with the keyCode.     *     * The keyCode currently supported is listed below as METADATA_XXX     * constants. With any other value, it returns a null pointer.     *     * @param keyCode One of the constants listed below at the end of the class.     * @return The meta data value associate with the given keyCode on success;     * null on failure.     */    public native String extractMetadata(int keyCode);    /**     * Call this method after setDataSource(). This method finds a     * representative frame if successful and returns it as a bitmap. This is     * useful for generating a thumbnail for an input media source.     *     * @return A Bitmap containing a representative video frame, which     *         can be null, if such a frame cannot be retrieved.     */    public native Bitmap captureFrame();       /**     * Call this method after setDataSource(). This method finds the optional     * graphic or album art associated (embedded or external url linked) the     * related data source.     *     * @return null if no such graphic is found.     */    public native byte[] extractAlbumArt();    /**     * Call it when one is done with the object. This method releases the memory     * allocated internally.     */    public native void release();    private native void native_setup();    private native final void native_finalize();    @Override    protected void finalize() throws Throwable {        try {            native_finalize();        } finally {            super.finalize();        }    }    public static final int MODE_GET_METADATA_ONLY  = 0x01;    public static final int MODE_CAPTURE_FRAME_ONLY = 0x02;    /*     * Do not change these values without updating their counterparts     * in include/media/mediametadataretriever.h!     */    public static final int METADATA_KEY_CD_TRACK_NUMBER = 0;    public static final int METADATA_KEY_ALBUM           = 1;    public static final int METADATA_KEY_ARTIST          = 2;    public static final int METADATA_KEY_AUTHOR          = 3;    public static final int METADATA_KEY_COMPOSER        = 4;    public static final int METADATA_KEY_DATE            = 5;    public static final int METADATA_KEY_GENRE           = 6;    public static final int METADATA_KEY_TITLE           = 7;    public static final int METADATA_KEY_YEAR            = 8;    public static final int METADATA_KEY_DURATION        = 9;    public static final int METADATA_KEY_NUM_TRACKS      = 10;    public static final int METADATA_KEY_IS_DRM_CRIPPLED = 11;    public static final int METADATA_KEY_CODEC           = 12;    public static final int METADATA_KEY_RATING          = 13;    public static final int METADATA_KEY_COMMENT         = 14;    public static final int METADATA_KEY_COPYRIGHT       = 15;    public static final int METADATA_KEY_BIT_RATE        = 16;    public static final int METADATA_KEY_FRAME_RATE      = 17;    public static final int METADATA_KEY_VIDEO_FORMAT    = 18;    public static final int METADATA_KEY_VIDEO_HEIGHT    = 19;    public static final int METADATA_KEY_VIDEO_WIDTH     = 20;    // Add more here...}

获取SD卡视频文件缩略图

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