保存图片(集)和视频到本地

一、保存图片(集)到本地

1.保存单张图片到本地，这里使用的是ImageLoader加载的图片，通过ImageLoader.getInstance().loadImageSync(path)返回图片的位图。

    // 保存图片
    private Runnable saveFileRunnable = new Runnable() {
        @Override
        public void run() {
            try {
//注释掉的代码是之前用的比较繁琐的方法来保存图片到本地
//                Drawable drawable = SaveImageUtil.loadImageFromNetwork(
//                        listMImage.get(indexImage).getImgPath());
//                if (drawable == null) {
//                    mSaveMessage = getString(
//                            R.string.language_pictureSavedFailed);
//                } else {
//                    BitmapDrawable bd = (BitmapDrawable) drawable;
//                    mBitmap = bd.getBitmap();
//                }
                //loadImage是异步加载;方法loadImageSync是同步加载，待图片资源加载完毕，直接返回位图(bitmap)资源对象
                mBitmap = ImageLoader.getInstance().loadImageSync(listMImage.get(indexImage).getImgPath());

                SaveImageUtil.saveFile(mBitmap, listMImage.get(indexImage).getImgPath(), getActivity());
                mSaveMessage = getString(R.string.language_pictureSavedSuccessfully);
            } catch (Exception e) {
                mSaveMessage = getString(R.string.language_pictureSavedFailed);
                e.printStackTrace();
            }
            messageHandler.sendMessage(messageHandler.obtainMessage());
        }
    };

private Handler messageHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        showToast(mSaveMessage);
    }
};

2.保存图片集到本地，也就是添加了一个循环，循环保存集合中的图片

    //保存所有的图片
    private Runnable saveAllFileRunnable = new Runnable() {
        @Override
        public void run() {
            try {
                downloadNum = 0;
                for (int i = 0; i < listMImage.size(); i++) {
                    if (listMImage.get(i).getMark() == 1) {//只保存已经上传了的所有图片
                        downloadNum++;
                        mBitmap = ImageLoader.getInstance().loadImageSync(listMImage.get(i).getImgPath());
                        SaveImageUtil.saveFile(mBitmap, listMImage.get(i).getImgPath(), getActivity());
                    }
                }
                if (downloadNum >= getServerImage.size()) {
                    mSaveMessage = getString(R.string.language_pictureSavedSuccessfully);
                    dismissProgressDialog();//隐藏提示正在保存图片的Dialog
                }
            } catch (Exception e) {
                dismissProgressDialog();
                e.printStackTrace();
            }
            if (isShareImage == false)
                messageHandler.sendMessage(messageHandler.obtainMessage());
        }
    };

private Handler messageHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        showToast(mSaveMessage);
    }
};

3.保存图片SaveImageUtil.saveFile(）方法：

    //下载图片保存到系统图库
    private static final String pathImage = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pictures/";
    /**
     * 把图片网址转换为Drawable
     */
    public static Drawable loadImageFromNetwork(String imageUrl) {
        Drawable drawable = null;
        try {
            // 可以在这里通过文件名来判断，是否本地有此图片
            drawable = Drawable.createFromStream(new URL(imageUrl).openStream(), "image.png");
        } catch (Exception e) {
            Log.d("test", e.getMessage());
        }
//        if (drawable == null) {
//            Log.d("test", "null drawable");
//        } else {
//            Log.d("test", "not null drawable");
//        }
        return drawable;
    }

    @SuppressLint("DefaultLocale")
    public static void saveFile(Bitmap bm, String url, Context context) throws Exception {
        // 判断sd卡是否存在
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            // 判断文件夹是否存在
            File dirFile = new File(path);
            if (!dirFile.exists()) {
                dirFile.mkdirs();//创建此抽象路径指定的目录，包括所有必须但不存在的父目录。（及可以创建多级目录，无论是否存在父目录）
            }
            String fileName = url.substring(url.lastIndexOf("/") + 1, url.length()).toLowerCase();
            File file = new File(path + fileName);
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
            bm.compress(Bitmap.CompressFormat.PNG, 100, bos);
            bos.flush();
            bos.close();
//            //把文件插入到系统图库
//            MediaStore.Images.Media.insertImage(context.getContentResolver(), bm, fileName, null);
            // 通知图库更新
            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + file)));
        } else {
            Toast.makeText(context, context.getString(R.string.language_notSDCard), Toast.LENGTH_SHORT).show();
        }
    }

二、保存视频到本地

1.需要导入文件下载的包

//filedownloader---Android 文件下载引擎，稳定、高效、灵活、简单易用
implementation 'com.liulishuo.filedownloader:library:1.7.3'

2.下载视频的代码

//下载视频到本地
private void downLoadVideo(String videoUrl) {
    FileDownloader.setup(getActivity());
    final String videoName = new File(videoUrl).getName();//得到图片名称
    FileDownloader.getImpl().create(videoUrl).setPath(downloadVideoPath + videoName).
            setForceReDownload(false)//强制重新下载，将会忽略检测文件是否健在
            .setListener(new FileDownloadListener() {
                @Override
                protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    //等待，已经进入下载队列
                    try {
                        showWaitProgressDialog(getActivity(), 1, getString(R.string.language_downloading));
                    } catch (Exception e) {
                    }
                }

                @Override
                protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    //下载进度
                }

                @Override
                protected void completed(BaseDownloadTask task) {
                    //完成整个下载过程
                    try {
                        dismissProgressDialog();
                        showToast(getString(R.string.language_saveSuccessfully));//退出界面时，下载完报错
                        // 通知图库更新
                        getActivity().sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + downloadVideoPath + videoName)));
                    } catch (Exception e) {
                    }
                }

                @Override
                protected void paused(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    //暂停下载
                }

                @Override
                protected void error(BaseDownloadTask task, Throwable e) {
                    //下载出现错误
                    try {
                        dismissProgressDialog();
                        showToast(getString(R.string.language_videosDownloadFail));
                    } catch (Exception ex) {
                    }
                }

                @Override
                protected void warn(BaseDownloadTask task) {
                    //在下载队列中(正在等待/正在下载)已经存在相同下载连接与相同存储路径的任务
                }
            }).start();
}