Android中保存网络图片到SD卡

/**
     * 下载闪屏页的图片
     */
    private void loadFirstImage(final String url) {
        /**
         * 在子线程中开启下载图片的任务
         */
        new Thread(new Runnable() {
            @Override
            public void run() {
                URL imageUrl;
                try {
                    if (!TextUtils.isEmpty(url)) {
                        imageUrl = new URL(url);
                        InputStream is = imageUrl.openStream();
                        Bitmap bitmap = BitmapFactory.decodeStream(is);
                        saveFile(bitmap, System.currentTimeMillis() + ".jpg"); //将当前的时间作为图片的名字保存起来
                        is.close();
                    }
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }).start();
    }

    /**
     * 保存图片到本地的SD卡
     *
     * @param bitmap   图片对象
     * @param fileName 图片名
     */
    private void saveFile(Bitmap bitmap, String fileName) {

        try {
            String filePath = "";
            if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) { //判断SD卡是否挂载
                filePath = Environment.getExternalStorageDirectory() + "/renruiJob/";
            } else {
                return;
            }

            File dirFile = new File(filePath);
            if (!dirFile.exists()) {
                dirFile.mkdir();
            }

            File myPictureFile = new File(filePath + fileName);
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myPictureFile));

            bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);

            bos.flush();
            bos.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }