Android: Ist es möglich, Video-Thumbnails anzuzeigen?

Ich habe eine Videoaufnahmeanwendung mit Bibliotheksdialog erstellt. Der Bibliotheksdialog zeigt die Liste der aufgezeichneten Videos an, wobei jedes Element auf folgende Weise aus Symbol, Videotitel, Tags und Standortinformationen besteht:

Alt-Text

Weiß jemand, ob es möglich ist, Icons durch Video-Thumbnails zu ersetzen (Einzelbild-Vorschau)?

Vielen Dank!

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Wenn Sie API 2.0 oder neuer verwenden, wird dies funktionieren.

int id = **"The Video's ID"** ImageView iv = (ImageView ) convertView.findViewById(R.id.imagePreview); ContentResolver crThumb = getContentResolver(); BitmapFactory.Options options=new BitmapFactory.Options(); options.inSampleSize = 1; Bitmap curThumb = MediaStore.Video.Thumbnails.getThumbnail(crThumb, id, MediaStore.Video.Thumbnails.MICRO_KIND, options); iv.setImageBitmap(curThumb); 

Wenn Sie nicht durch den Cursor gehen können und wenn Sie nur Pfade oder Dateiobjekte haben, können Sie seit API Level 8 (2.2) öffentliche statische Bitmap createVideoThumbnail (String filePath, int kind) verwenden

Android-Dokumentation

Der folgende Code läuft perfekt:

 Bitmap bMap = ThumbnailUtils.createVideoThumbnail(file.getAbsolutePath(), MediaStore.Video.Thumbnails.MICRO_KIND); 

Verwenden der class:

 import android.provider.MediaStore.Video.Thumbnails; 

Wir können zwei Vorschau-Miniaturansichten aus dem Video abrufen:

Thumbnails.MICRO_KIND für 96 x 96

Thumbnails.MINI_KIND für 512 x 384 px

Dies ist ein Codebeispiel:

 String filePath = "/sdcard/DCIM/Camera/my_video.mp4"; //change the location of your file! ImageView imageview_mini = (ImageView)findViewById(R.id.thumbnail_mini); ImageView imageview_micro = (ImageView)findViewById(R.id.thumbnail_micro); Bitmap bmThumbnail; //MICRO_KIND, size: 96 x 96 thumbnail bmThumbnail = ThumbnailUtils.createVideoThumbnail(filePath, Thumbnails.MICRO_KIND); imageview_micro.setImageBitmap(bmThumbnail); // MINI_KIND, size: 512 x 384 thumbnail bmThumbnail = ThumbnailUtils.createVideoThumbnail(filePath, Thumbnails.MINI_KIND); imageview_mini.setImageBitmap(bmThumbnail); 

Zur Zeit verwende ich folgenden Code:

 Bitmap bMap = ThumbnailUtils.createVideoThumbnail(file.getAbsolutePath(), MediaStore.Video.Thumbnails.MICRO_KIND); 

Aber ich fand bessere Lösung mit Glide- Bibliothek mit folgendem Code (Es cache auch dein Image und habe eine bessere performance als vorheriger Ansatz)

 Glide.with(context) .load(uri) .placeholder(R.drawable.ic_video_place_holder) .into(imageView); 

Ich empfehle Ihnen, die Glide- Bibliothek zu verwenden. Es ist eine der effizientesten Möglichkeiten, ein Video-Thumbnail für eine lokale Videodatei zu erstellen und anzuzeigen.

Fügen Sie diese Zeile einfach zu Ihrer Gradle-Datei hinzu:

 compile 'com.github.bumptech.glide:glide:3.7.0' 

Und es wird so einfach werden wie:

 String filePath = "/storage/emulated/0/Pictures/example_video.mp4"; Glide .with( context ) .load( Uri.fromFile( new File( filePath ) ) ) .into( imageViewGifAsBitmap ); 

Weitere Informationen finden Sie hier: https://futurestud.io/blog/glide-displaying-gifs-and-videos

Prost !

Android 1.5 und 1.6 bieten keine Thumbnails, aber 2.0, wie in den offiziellen Versionshinweisen zu sehen ist :

Medien

  • MediaScanner generiert jetzt Miniaturbilder für alle Bilder, wenn sie in MediaStore eingefügt werden.
  • Neue Thumbnail-API zum Abruf von Bild- und Video-Thumbnails bei Bedarf

Diese Lösung funktioniert für jede Android-Version. Es hat sich bewährt, in 1.5 und 2.2 zu funktionieren. Dies ist keine andere “This is for Android 2.0+” Lösung. Ich habe dies über eine E-Mail-Sammlungsseite gefunden und kann den ursprünglichen Link nicht finden. Alles Verdienst geht an das Original-Poster.

In Ihrer App würden Sie dies verwenden, indem Sie aufrufen:

 Bitmap bm = getVideoFrame(VideoStringUri); 

Irgendwo in seiner eigenen function (außerhalb der OnCreate, ect), würden Sie benötigen:

 private Bitmap getVideoFrame(String uri) { MediaMetadataRetriever retriever = new MediaMetadataRetriever(); try { retriever.setMode(MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY); retriever.setDataSource(uri); return retriever.captureFrame(); } catch (IllegalArgumentException ex) { ex.printStackTrace(); } catch (RuntimeException ex) { ex.printStackTrace(); } finally { try { retriever.release(); } catch (RuntimeException ex) { } } return null; } 

In Ihrem src-Ordner benötigen Sie ein neues Unterverzeichnis android / media, das die class enthält (kopiert von der Android-Quelle selbst), die Ihnen die Verwendung dieser function ermöglicht. Dieser Teil sollte nicht geändert, umbenannt oder anderswo platziert werden. MediaMetadataRetriever.java muss sich unter android.media in Ihrem Quellordner befinden, damit dies funktioniert.

 /* * 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 java.io.FileDescriptor; import java.io.FileNotFoundException; import java.io.IOException; import android.content.ContentResolver; import android.content.Context; import android.content.res.AssetFileDescriptor; import android.graphics.Bitmap; import android.net.Uri; /** * 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"); native_init(); } // The field below is accessed by native methods 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 (ie, 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 static native void native_init(); 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; public static final int METADATA_KEY_WRITER = 21; public static final int METADATA_KEY_MIMETYPE = 22; public static final int METADATA_KEY_DISCNUMBER = 23; public static final int METADATA_KEY_ALBUMARTIST = 24; // Add more here... } 

Dies ist der Code für die Live-Video-Miniaturansicht.

 public class LoadVideoThumbnail extends AsyncTask{ @Override protected Bitmap doInBackground(Object... params) {try { String mMediaPath = "http://sofde.miximages.com/android/portland.jpg"); Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(mMediaPath, MediaStore.Video.Thumbnails.MICRO_KIND); ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); byte[] byteArray = stream.toByteArray(); out=new FileOutputStream(land.getPath()); out.write(byteArray); out.close(); return bitmap; } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } @Override protected void onPostExecute(Bitmap result) { // TODO Auto-generated method stub super.onPostExecute(result); if(result != null){ ((ImageView)findViewById(R.id.imageView1)).setImageBitmap(result); } Log.e("TEST Chirag","====> End"); } }