Android 网络图片下载保存本地及插入系统相册

一、保存图片到本地

public static void saveToSystemGallery(Context context, Bitmap bmp) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), "vgmap");
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        // 其次把文件插入到系统图库
        try {
            MediaStore.Images.Media.insertImage(context.getContentResolver(),
                    file.getAbsolutePath(), fileName, null);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        // 最后通知图库更新
        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath())));
    }

二、 保存网络图片到本地，同时插入到系统相册

    /**
     * 下载 分享海报图片 并保存本地
     */
    private void mDownloadPosterPic(String url) {
        String fileDir = Environment.getExternalStorageDirectory() + "/temp";
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(fileDir);
        OkHttpUtils.get(url)
                .tag(this)
                .execute(new DownloadFileCallBack(fileDir, fileName));//保存到sd卡
    }

   saveToSystemGallery(mContext, file, fileNameNew);  //把文件插入到系统图库

    /**
     * 保存图片到本地,其次把文件插入到系统图库
     *
     * @param context
     * @param file
     * @param fileName
     */
    public static void saveToSystemGallery(Context context, File file, String fileName) {
        try {
            MediaStore.Images.Media.insertImage(context.getContentResolver(),
                    file.getAbsolutePath(), fileName, null);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        // 最后通知图库更新
        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath())));
    }

三、网络URL图片地址转Bitmap 

以下方法需要一个线程去访问

    public Bitmap getBitmap(String imgUrl) {
        InputStream inputStream = null;
        ByteArrayOutputStream outputStream = null;
        URL url = null;
        try {
            url = new URL(imgUrl);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("GET");
            httpURLConnection.setReadTimeout(2000);
            httpURLConnection.connect();
            if (httpURLConnection.getResponseCode() == 200) {
                //网络连接成功
                inputStream = httpURLConnection.getInputStream();
                outputStream = new ByteArrayOutputStream();
                byte buffer[] = new byte[1024 * 8];
                int len = -1;
                while ((len = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, len);
                }
                byte[] bu = outputStream.toByteArray();
                Bitmap bitmap = BitmapFactory.decodeByteArray(bu, 0, bu.length);
                return bitmap;
            } else {
                Log.d(TAG, "网络连接失败----" + httpURLConnection.getResponseCode());
            }
        } catch (Exception e) {
            // TODO: handle exception
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

更多相关问题可参考：Android网络URL图片地址转Bitmap并且保存到本地