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<videoItem> 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...}

现在暂时用不到     标记收藏

好东东啊

就是说明有点点少啊

顶~好东西~~~正需要

楼主 我引用不到这个类 ！！ 有什么办法吗？？

需要导出 libmedia_jni.so 文件

本帖最后由 fox007_ggr 于 2011-3-30 12:24 编辑

导出办法：
  1.进入DDMS
  2.进入手机的 system->lib 目录，
3.选择 libmedia_jni.so 文件
4.push a file from the device 就可以导出该文件到你的PC

5.将  libmedia_jni.so 添加到你的工程就OK了

转帖：http://www.buildapp.net/android/show.asp?id=43652