保存圖片(集)和視頻到本地

一、保存圖片(集)到本地

1.保存單張圖片到本地，這里使用的是ImageLoader加載的圖片，通過ImageLoader.getInstance().loadImageSync(path)返回圖片的位圖。

    // 保存圖片
    private Runnable saveFileRunnable = new Runnable() {
        @Override
        public void run() {
            try {
//注釋掉的代碼是之前用的比較繁瑣的方法來保存圖片到本地
//                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是異步加載;方法loadImageSync是同步加載，待圖片資源加載完畢，直接返回位圖(bitmap)資源對象
                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.保存圖片集到本地，也就是添加了一個循環，循環保存集合中的圖片

    //保存所有的圖片
    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) {//只保存已經上傳了的所有圖片
                        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();//隱藏提示正在保存圖片的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.保存圖片SaveImageUtil.saveFile(）方法：

    //下載圖片保存到系統圖庫
    private static final String pathImage = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pictures/";
    /**
     * 把圖片網址轉換為Drawable
     */
    public static Drawable loadImageFromNetwork(String imageUrl) {
        Drawable drawable = null;
        try {
            // 可以在這里通過文件名來判斷，是否本地有此圖片
            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 {
        // 判斷sd卡是否存在
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            // 判斷文件夾是否存在
            File dirFile = new File(path);
            if (!dirFile.exists()) {
                dirFile.mkdirs();//創建此抽象路徑指定的目錄，包括所有必須但不存在的父目錄。（及可以創建多級目錄，無論是否存在父目錄）
            }
            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();
//            //把文件插入到系統圖庫
//            MediaStore.Images.Media.insertImage(context.getContentResolver(), bm, fileName, null);
            // 通知圖庫更新
            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、保存視頻到本地

1.需要導入文件下載的包

//filedownloader---Android 文件下載引擎，穩定、高效、靈活、簡單易用
implementation 'com.liulishuo.filedownloader:library:1.7.3'

2.下載視頻的代碼

//下載視頻到本地
private void downLoadVideo(String videoUrl) {
    FileDownloader.setup(getActivity());
    final String videoName = new File(videoUrl).getName();//得到圖片名稱
    FileDownloader.getImpl().create(videoUrl).setPath(downloadVideoPath + videoName).
            setForceReDownload(false)//強制重新下載，將會忽略檢測文件是否健在
            .setListener(new FileDownloadListener() {
                @Override
                protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    //等待，已經進入下載隊列
                    try {
                        showWaitProgressDialog(getActivity(), 1, getString(R.string.language_downloading));
                    } catch (Exception e) {
                    }
                }

                @Override
                protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    //下載進度
                }

                @Override
                protected void completed(BaseDownloadTask task) {
                    //完成整個下載過程
                    try {
                        dismissProgressDialog();
                        showToast(getString(R.string.language_saveSuccessfully));//退出界面時，下載完報錯
                        // 通知圖庫更新
                        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) {
                    //暫停下載
                }

                @Override
                protected void error(BaseDownloadTask task, Throwable e) {
                    //下載出現錯誤
                    try {
                        dismissProgressDialog();
                        showToast(getString(R.string.language_videosDownloadFail));
                    } catch (Exception ex) {
                    }
                }

                @Override
                protected void warn(BaseDownloadTask task) {
                    //在下載隊列中(正在等待/正在下載)已經存在相同下載連接與相同存儲路徑的任務
                }
            }).start();
}