編輯:關於Android編程
網上有很多關於拍照上傳的實現方法,如果用新版本android去運行有可能會發現根本實現不了。主要原因是android從4.4版本開始通過intent.ACTION_GET_CONTENT打開選擇器後,getData()返回的URI沒有包含真實的文件路徑,而是像這樣“content://com.android.providers.media.documents/document/image:1234”,以至於用傳統的方式找不到圖片的路徑。最簡單的解決辦法是用intent.ACTION_PICK代替intent.ACTION_GET_CONTENT。
下面給出4.4版本後拍照上傳的具體實現方法:
第一步:點擊拍照按鈕代碼
//點擊拍照 btnHeadCamera.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent itCamera=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(itCamera,0); } });
第二步:保存拍照圖片代碼
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode){ case 0://拍照 savePhoto(data); break; } super.onActivityResult(requestCode, resultCode, data); } final String SAVE_PATH=Environment.getExternalStorageDirectory()+"/my_head.jpg"; //拍照後保存路徑 //保存圖片 public void savePhoto(Intent it){ Bundle bundle=it.getExtras(); if(bundle!=null){ Bitmap photo = bundle.getParcelable("data"); imgHead.setImageBitmap(photo); File fileHead=new File(SAVE_PATH); try { if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ if(!fileHead.getParentFile().exists()){ fileHead.getParentFile().mkdir(); } BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(fileHead)); photo.compress(Bitmap.CompressFormat.JPEG,80,bos); bos.flush(); bos.close(); }else { Toast toast = Toast.makeText(HeadPhotoActivity.this, "保存失敗!", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } }catch (FileNotFoundException e){ e.printStackTrace(); }catch (IOException e){ e.printStackTrace(); } } }
第三步:上傳圖片代碼
String SERVER_URL = Config.PhotoAPI+"/UploadImage";//上傳的服務端API地址btnHeadCancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { new Thread(new Runnable() { @Override public void run() { File file = new File(SAVE_PATH); Message msg = new Message(); msg.what = 0; if(file!=null) { try { int re = ImageUtils.uploadForm(file, SERVER_URL); msg.obj = re; } catch (IOException ex) { msg.obj = 0; Toast.makeText(HeadPhotoActivity.this, "上傳失敗", Toast.LENGTH_SHORT).show(); } handler.sendMessage(msg); }else { Toast.makeText(HeadPhotoActivity.this, "找不到上傳圖片", Toast.LENGTH_SHORT).show(); } } }).start(); } });
final Handler handler=new Handler(){ @Override public void handleMessage(Message msg) { switch (msg.what) { case 0: if ((int)msg.obj == 1) { Toast.makeText(HeadPhotoActivity.this, "上傳成功", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(HeadPhotoActivity.this, "上傳失敗", Toast.LENGTH_SHORT).show(); } break; } } };
/** * * @param uploadFile * 需要上傳的文件 * @param serverUrl * 上傳的服務器的路徑 * @throws IOException */ public static int uploadForm(File uploadFile, String serverUrl) throws IOException { int re=0; String fileName = uploadFile.getName(); StringBuilder sb = new StringBuilder(); sb.append("--" + BOUNDARY + "\r\n"); sb.append("Content-Disposition: form-data; name=\"" + fileName + "\"; filename=\"" + fileName + "\"" + "\r\n"); sb.append("Content-Type: image/jpeg" + "\r\n"); sb.append("\r\n"); byte[] headerInfo = sb.toString().getBytes("UTF-8"); byte[] endInfo = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8"); System.out.println(sb.toString()); URL url = new URL(serverUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); conn.setRequestProperty("Content-Length", String .valueOf(headerInfo.length + uploadFile.length() + endInfo.length)); conn.setDoOutput(true); OutputStream out = conn.getOutputStream(); InputStream in = new FileInputStream(uploadFile); out.write(headerInfo); byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) != -1) out.write(buf, 0, len); out.write(endInfo); in.close(); out.close(); if (conn.getResponseCode() == 200) { re=1; } return re; }
最後給出服務端WebAPI代碼:
[HttpPost] public async Task<HttpResponseMessage> UploadImage() {string filePath = "~\\UploadFiles\\Photo"; // 取得文件夾 string dir = HttpContext.Current.Server.MapPath(filePath); //如果不存在文件夾,就創建文件夾 if (!Directory.Exists(dir)) Directory.CreateDirectory(dir); if (!Request.Content.IsMimeMultipartContent("form-data")) { throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); } var provider = new CustomMultipartFormDataStreamProvider(dir); try { // Read the form data. await Request.Content.ReadAsMultipartAsync(provider); foreach (MultipartFileData file in provider.FileData) { //file.Headers.ContentDisposition.FileName;//上傳文件前的文件名 //file.LocalFileName;//上傳後的文件名 Photo p = new Photo(); p.ImgInfo = file.LocalFileName.Substring(file.LocalFileName.LastIndexOf("\\")); p.Sort = "員工相冊"; p.AddUser = "admin"; p.AddTime = DateTime.Now; p.Url = filePath + p.ImgInfo; db.Photo.Add(p); db.SaveChanges(); } return Request.CreateResponse(HttpStatusCode.OK); } catch { return Request.CreateResponse(HttpStatusCode.BadRequest); } }
//重寫上傳文件名 public class CustomMultipartFormDataStreamProvider : MultipartFormDataStreamProvider { public CustomMultipartFormDataStreamProvider(string path) : base(path) { } public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers) { string fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff"); return fileName + "_" + headers.ContentDisposition.FileName.Replace("\"", string.Empty);//base.GetLocalFileName(headers); } }
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持本站。
原生的Android設置裡面沒有默認存儲器的選項,但是MTK偏偏加上了這個功能,可能MTK覺得這個比較有用吧,所以,他們在原生的基礎上面做了修改,加上了這個功能
在web頁面中,有a標簽的超鏈接實現跳轉,同樣在Android當中,用TextView控件來顯示文字,實現它的事件來跳轉。用過微博Android手機端的朋友的都知道微博正
49.Android 各種SpanAndroid 各種Span 前言 SpannableStringBuilder URLSpan UnderlineSpan Typef
用過安卓手機的用戶以及安卓開發者們會時長碰到程序異常退出的情況,普通用戶遇到這種情況,肯定非常惱火,甚至會罵一生垃圾軟件,然後卸載掉。那麼開發者們在開發過程中遇到這種情況