android 下载图片并刷新相册

public class HelpOpenFileUtils {/*** 读写权限*/protected static final int WRITE_PERMISSION = 20003;protected static final String[] WRITEPERMISSION = {Manifest.permission.WRITE_EXTERNAL_STORAGE};private static final String TAG = "TAG_HelpOpenFileUtils";public static void nativeDownloadFile(final Activity context, String url, final File downloadFile) {OkHttpClient httpClient = new OkHttpClient.Builder().build();Request request = new Request.Builder().url(url).get().build();Call call = httpClient.newCall(request);call.enqueue(new Callback() {@Overridepublic void onFailure(Call call, IOException e) {Log.e("TAG_文件下载", "onFailure");ToastUtil.showToast("下载文件失败！！！");}@Overridepublic void onResponse(Call call, Response response) throws IOException {int code = response.code();if (code >= 500) {Log.e("TAG_文件下载", "code=" + code);ToastUtil.showToast("下载文件失败！！！");} else if (code >= 200 && code < 300) {InputStream is = response.body().byteStream();byte[] buf = new byte[8 * 1024];int len = 0;long sum = 0;OutputStream fos = null;try {Log.e("TAG_文件下载", "downloadFile=" + downloadFile);fos = new FileOutputStream(downloadFile);while ((len = is.read(buf)) != -1) {fos.write(buf, 0, len);sum += len;}fos.flush();// 通知图库更新LocalBroadcastManager.getInstance(MyApplication.getInstance()).sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(downloadFile.getAbsolutePath())));ToastUtil.showToast("图片保存成功！");} catch (IOException e) {e.printStackTrace();Log.e("TAG_文件下载", "IOException=");ToastUtil.showToast("下载文件失败！！！");} finally {if (is != null) {is.close();}if (fos != null) {fos.close();}}}}});}//文件下载public static File createFile(FragmentActivity context, String url) {if (url.indexOf(".") != -1) {String type = url.substring(url.lastIndexOf(".") + 1);Log.e(TAG, "createFile===type=" + type);PermissionsChecker mChecker = new PermissionsChecker(context);if (mChecker.lacksPermissions(WRITEPERMISSION)) {// 请求权限PermissionsActivity.startActivityForResult((Activity) context, WRITE_PERMISSION, WRITEPERMISSION);} else {// 全部权限都已获取Log.e(TAG, "createFile===url=" + url);if (TextUtils.isEmpty(url)) {Log.e(TAG, "downloadFile: url下载地址为空！！！");return null;}try {int indexOf = url.indexOf("file_name=");if (indexOf != -1) {url = url.substring(0, indexOf + 10) + URLEncoder.encode(url.substring(indexOf + 10), "UTF-8");Log.e(TAG, "createFile===url=" + url);}} catch (UnsupportedEncodingException e) {e.printStackTrace();}File downloadFile = createDefaultTimeFile(type);if (null == downloadFile) {Log.e(TAG, "downloadFile: 文件创建失败！！！");return null;}return downloadFile;}}return null;}//文件下载public static void downloadFile(Activity context, String url) {if (url.indexOf(".") != -1) {int dian = url.lastIndexOf(".") + 1;String type = "";if (url.indexOf("/?") != -1) {int i = url.lastIndexOf("/?");type = url.substring(dian, i);} else if (url.indexOf("?") != -1) {int i = url.lastIndexOf("?");type = url.substring(dian, i);} else {type = url.substring(dian);}downloadFile(context, url, type);}}public static void downloadFile(Activity context, String url, String type) {Log.e(TAG, "type=" + type);PermissionsChecker mChecker = new PermissionsChecker(context);if (mChecker.lacksPermissions(WRITEPERMISSION)) {// 请求权限PermissionsActivity.startActivityForResult((Activity) context, WRITE_PERMISSION, WRITEPERMISSION);} else {// 全部权限都已获取Log.e(TAG, "url=" + url);if (TextUtils.isEmpty(url)) {Log.e(TAG, "downloadFile: url下载地址为空！！！");return;}try {int indexOf = url.indexOf("file_name=");if (indexOf != -1) {url = url.substring(0, indexOf + 10) + URLEncoder.encode(url.substring(indexOf + 10), "UTF-8");Log.e(TAG, "url=" + url);}} catch (UnsupportedEncodingException e) {e.printStackTrace();}File downloadFile = createDefaultTimeFile(type);if (null == downloadFile) {Log.e(TAG, "downloadFile: 文件创建失败！！！");return;}nativeDownloadFile(context, url, downloadFile);}}public static String dateFormat(long times, String dateformat) {if (times <= 0)return "";SimpleDateFormat dateformat1 = new SimpleDateFormat(dateformat);String dateStr = dateformat1.format(times);return dateStr;}private static File createDefaultTimeFile(String type) {String fileName = dateFormat(System.currentTimeMillis(), "yyyyMMddHHmmss");String mDownloadDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath() + File.separator + "download";File downloadFile = new File(mDownloadDir, fileName + "." + type);return createFile(downloadFile);}public static File createFile(File file) {Log.e(TAG, "file=" + file.toString());if (!file.getParentFile().exists()) {if (!file.getParentFile().mkdirs()) {Log.e(TAG, "createFile: 目录创建失败！！！");return null;}}try {file = new File(file.toString());file.createNewFile();} catch (IOException e) {e.printStackTrace();return null;}return file;}public static String dateFormat(long times, String dateformat) {if (times <= 0)return "";SimpleDateFormat dateformat1 = new SimpleDateFormat(dateformat);String dateStr = dateformat1.format(times);return dateStr;}}

这是下载文件工具类，使用时直接HelpOpenFileUtils.downloadFile(this,url);即可

附带一个实用工具类ToastUtil

public class ToastUtil {private static Toast toast;private static Handler mHandler = new Handler(Looper.getMainLooper());public static void showToast(String text) {showToast(text, Toast.LENGTH_SHORT);}public static void showToast(int text) {showToast(BaseApp.getAppContext().getString(text), Toast.LENGTH_SHORT);}private static void showToast(final String text, final int duration) {if (Looper.myLooper() == Looper.getMainLooper()) {show(text, duration);} else {mHandler.post(new Runnable() {@Overridepublic void run() {show(text, duration);}});}}private static void show(String text, int duration) {if (toast != null) {toast.cancel();}Log.e("TAG_Toast","text="+text);if (!TextUtils.isEmpty(text)){toast = Toast.makeText(BaseApp.getAppContext(),text, duration);toast.show();}}
}

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