获取SD卡、T卡以及手机内存中的视频缩略图

来源：互联网发布：知乎添加剂的危害编辑：程序博客网时间：2024/05/16 04:43

1.项目中使用listView展示SD卡中所有的视频，原来是需要手动添加路径，特别麻烦，有的外置卡什么的会读取不到，所以重新对方法进行了修改。

2.在adapter中设置图片的时候：

mViewHolder.videoView.setImageBitmap(bitmapCache.getVideoThumbnail(mContext,url, 500, 300, MediaStore.Images.Thumbnails.MICRO_KIND));

url = localPath.get(position);

3.数据来源：获取所有视频地址的方法。获取的数据添加到adapter 中的List<String> localPath;

private static List<String> list = new ArrayList<String>();private String[] strings;public String[] getPaths() {    if (list != null) {        list.clear();    }    if (getContext() != null) {        Cursor cursor = getActivity().getContentResolver().query(                MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null,                null, MediaStore.Video.Media.DEFAULT_SORT_ORDER);        if (cursor != null) {            while (cursor.moveToNext()) {                String path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));                list.add(path);            }            cursor.close();        }    }    if (list.size() != 0) {        strings = list.toArray(new String[list.size()]);    }    return strings;}

4.方法调用：

主要就是获取地址最后的"/"以及"."中间的名称命名为".jpg“。如果没有就从新保存一次图片。有的视频可能解码的时候没有图片，这是需要设置默认一张图。

public static Bitmap getVideoThumbnail(Context context, String videoPath, int width, int height, int kind) {    Bitmap bitmap = null;    int start = videoPath.lastIndexOf("/") + 1;    String path = SdcardHelper.SDCARD_DIR + videoPath.substring(start, videoPath.lastIndexOf(".")) + ".jpg";    bitmap = getBitmap(path,width, height);    if (bitmap == null) {        bitmap = ThumbnailUtils.createVideoThumbnail(videoPath, kind);        bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);        if (bitmap == null) {            bitmap = BitmapFactory.decodeResource(context.getResources(),R.drawable.film_cover_loading1);        } else {            saveBitmap(bitmap, videoPath.substring(start, videoPath.lastIndexOf(".")));        }    }    return bitmap;}

//    从SD卡中加载图片    public static Bitmap getBitmap(String path,int width, int height) {        File mfile = new File(path);        Bitmap bm = null;        if (mfile.exists()) {            Options options = new Options();            options.inJustDecodeBounds = true;            options.inPurgeable = true;            BitmapFactory.decodeFile(path, options);            options.inSampleSize = calculateInSampleSize(options,                    width, height);            options.inJustDecodeBounds = false;            bm = BitmapFactory.decodeFile(path, options);        }        return bm;    }
//    保存图片    private static File f;    public static void saveBitmap(Bitmap bitmap, String picName) {        f = new File(SdcardHelper.SDCARD_DIR, picName + ".jpg");              try {            FileOutputStream out = new FileOutputStream(f);            bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);            out.flush();            out.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }

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