Android 图片视频保存至系统相册

保存图片到系统相册

    /**
     * 获取 图片 ContentValue
     * @param paramFile
     * @param paramLong
     * @return
     */
    public static ContentValues getImageContentValues(File paramFile, long paramLong) {
        ContentValues localContentValues = new ContentValues();
        localContentValues.put("title", paramFile.getName());
        localContentValues.put("_display_name", paramFile.getName());
        localContentValues.put("mime_type", "image/jpeg");
        localContentValues.put("datetaken", Long.valueOf(paramLong));
        localContentValues.put("date_modified", Long.valueOf(paramLong));
        localContentValues.put("date_added", Long.valueOf(paramLong));
        localContentValues.put("orientation", Integer.valueOf(0));
        localContentValues.put("_data", paramFile.getAbsolutePath());
        localContentValues.put("_size", Long.valueOf(paramFile.length()));
        return localContentValues;
    }

    /**
     * 将图片保存到系统图库
     *
     * @param imageFile
     * @param context
     */
    public static boolean saveImgToSystemAlbum(String imageFile, Context context) {

        try {
            ContentResolver localContentResolver = context.getContentResolver();
            ContentValues localContentValues = getImageContentValues(new File(imageFile), System.currentTimeMillis());
            localContentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, localContentValues);

            Intent localIntent = new Intent("android.intent.action.MEDIA_SCANNER_SCAN_FILE");
            final Uri localUri = Uri.fromFile(new File(imageFile));
            localIntent.setData(localUri);
            context.sendBroadcast(localIntent);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

保存视频到系统相册

    /**
     * 获取视频 contentValue
     * @param paramFile
     * @param paramLong
     * @return
     */
    public static ContentValues getVideoContentValues(File paramFile, long paramLong) {
        ContentValues localContentValues = new ContentValues();
        localContentValues.put("title", paramFile.getName());
        localContentValues.put("_display_name", paramFile.getName());
        localContentValues.put("mime_type", "video/mp4");
        localContentValues.put("datetaken", Long.valueOf(paramLong));
        localContentValues.put("date_modified", Long.valueOf(paramLong));
        localContentValues.put("date_added", Long.valueOf(paramLong));
        localContentValues.put("_data", paramFile.getAbsolutePath());
        localContentValues.put("_size", Long.valueOf(paramFile.length()));
        return localContentValues;
    }


   /**
     * 将视频保存到系统图库
     *
     * @param videoFile
     * @param context
     */
    public static boolean saveVideoToSystemAlbum(String videoFile, Context context) {

        try {
            ContentResolver localContentResolver = context.getContentResolver();
            ContentValues localContentValues = getVideoContentValues(new File(videoFile), System.currentTimeMillis());

            Uri localUri = localContentResolver.insert(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, localContentValues);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && context.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.Q) {
                // 拷贝到指定uri,如果没有这步操作，android11不会在相册显示
                try {
                    OutputStream out = context.getContentResolver().openOutputStream(localUri);
                    copyFile(videoFile, out);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, localUri));
            //将该文件扫描到相册
            //MediaScannerConnection.scanFile(context, new String[] { videoFile }, null, null);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 拷贝文件
     * @param oldPath
     * @param out
     * @return
     */
    public static boolean copyFile(String oldPath, OutputStream out) {
        LogWrite.d(TAG, "oldPath = " + oldPath);
        try {
            int bytesum = 0;
            int byteread = 0;
            File oldfile = new File(oldPath);
            if (oldfile.exists()) {
                // 读入原文件
                InputStream inStream = new FileInputStream(oldPath);
                byte[] buffer = new byte[1444];
                while ((byteread = inStream.read(buffer)) != -1) {
                    bytesum += byteread; //字节数 文件大小
                    System.out.println(bytesum);
                    out.write(buffer, 0, byteread);
                }
                inStream.close();
                out.close();
                return true;
            }
            else {
                Log.w(TAG, String.format("文件(%s)不存在。", oldPath));
            }
        }
        catch (Exception e) {
            Log.e(TAG, "复制单个文件操作出错");
            e.printStackTrace();
        }

        return false;
    }

以上代码均为FileHelper类方法
接下来看IPreviewActivity中如何调用

    /**
     * 保存到相册
     */
    private void saveToLocalSystem(){
        final String dataUrl = adapter.getItem(viewPager.getCurrentItem());
        File file = new File(dataUrl);
        if(file.exists()){

            //先拷贝到相册目录
            String tempFile = null;
            if(StringUtils.isVideo(dataUrl)) {
                tempFile = PathInfo.getInstance(mContext).getSDcardDCIMFile(".mp4");
                FileHelper.copyFile(file.getAbsolutePath(), tempFile);
                FileHelper.saveVideoToSystemAlbum(tempFile, mContext);

            }else{
                tempFile = PathInfo.getInstance(mContext).getSDcardDCIMFile(".png");
                FileHelper.copyFile(file.getAbsolutePath(), tempFile);
                FileHelper.saveImgToSystemAlbum(tempFile, mContext);
            }

            showToast("已保存到系统图库");
        }else{

            //下载文件
            final LoadingDialog dialog = LoadingDialog.show(mContext);
            new Thread(){
                @Override
                public void run() {

                    final File file = ImageLoad.downloadImage(mContext, dataUrl);

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            dialog.dismiss();

                            //文件拷贝到本地
                            String tempFile = null;
                            if(StringUtils.isVideo(dataUrl)) {
                                tempFile = PathInfo.getInstance(mContext).getSDcardDCIMFile(".mp4");
                                FileHelper.copyFile(file.getAbsolutePath(), tempFile);
                                FileHelper.saveVideoToSystemAlbum(tempFile, mContext);
                            }else{
                                tempFile = PathInfo.getInstance(mContext).getSDcardDCIMFile(".png");
                                FileHelper.copyFile(file.getAbsolutePath(), tempFile);
                                FileHelper.saveImgToSystemAlbum(tempFile, mContext);
                            }

                            showToast("已保存到系统图库");
                        }
                    });
                }
            }.start();
        }
    }

到这里就基本完成了，但缺下面两行代码的源码
tempFile = PathInfo.getInstance(mContext).getSDcardDCIMFile
FileHelper.copyFile(file.getAbsolutePath(), tempFile);

    public String getSDcardDCIMFile(String suffix){
        return Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "DCIM" + File.separator + getTimeName() +suffix;
    }


    /**
     * 拷贝文件
     *
     * @param sourcePath 原始文件路径
     * @param targetPath 目标存放文件路径
     */
    public static boolean copyFile(String sourcePath, String targetPath) {

        //文件非空判断
        if (TextUtils.isEmpty(sourcePath) || TextUtils.isEmpty(targetPath)) {
            return false;
        }

        File source = new File(sourcePath);
        File target = new File(targetPath);

        //源文件，和目标文件是同一个文件，并且目标文件存在，直接返回
        if (sourcePath.equals(targetPath) && target.exists()) {
            return false;
        }

        if (!target.exists()) {
            String path = targetPath.substring(0, targetPath.lastIndexOf("/"));
            File s = new File(path);
            s.mkdirs();
        }


        InputStream in = null;
        OutputStream out = null;
        try {
            in = new BufferedInputStream(new FileInputStream(source));
            out = new BufferedOutputStream(new FileOutputStream(target));
            byte[] buf = new byte[8192];
            int i;
            while ((i = in.read(buf)) != -1) {
                out.write(buf, 0, i);
            }
        } catch (Exception e) {
            e.printStackTrace();
            LogWrite.writeMsg(e);
        } finally {
            try {
                if (out != null)
                    out.close();
                if (in != null)
                    in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return true;

    }

为什么就保存至系统相册代码量如此多，也是为了兼容Android Q R 以上版本问题。
主要操作步骤就是
1.将文件从app的沙盒目录中将文件拷贝到Sdcard中
2.发送广播去扫描文件