android一個上傳圖片的例子,包括如何終止上傳過程，如果在上傳的時候更新進度條(二)

android一個上傳圖片的例子,包括如何終止上傳過程，如果在上傳的時候更新進度條(二)

可以這樣來實現上傳:

activity中執行:

private class UploadPhotoTask extends AsyncTask{    @Overrideprotected void onPreExecute() {super.onPreExecute();}protected Boolean doInBackground(String... params) {    return HttpUploadedFile.getInstance().doUploadPhoto(getApplicationContext(), mUploadFilePathName, mHandler);    }          protected void onPostExecute(Boolean result){    mIsUploading = false;    showProgressBar(false);if(result){Toast.makeText(UploadPhotoActivity.this, R.string.upload_photo_fail, Toast.LENGTH_SHORT).show();}else{Toast.makeText(UploadPhotoActivity.this, R.string.upload_photo_fail, Toast.LENGTH_SHORT).show();}    }}

寫一個handle來更新進度條:

/** Handler to get notify from upload photo engine*/private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case HttpUploadedFile.POST_PROGRESS_NOTIFY:int completePercent = msg.arg1;HandleUploadProgress(completePercent);break;default:break;}}};/**     * handle the uploading progress notification     */private void HandleUploadProgress(int completePercent){View containerView = findViewById(R.id.photo_upload_progress_bar_container);int maxLen = containerView.getWidth(); //這個是進度條所在的parent layout的寬度int barLen = (completePercent * maxLen) / 100;View barView = findViewById(R.id.photo_upload_progress_bar);LayoutParams params = new LayoutParams();params.height = LayoutParams.FILL_PARENT;params.width = barLen;barView.setLayoutParams(params);  //更新進度條的寬度}/**     * show or hide progress bar     */private void showProgressBar(boolean show){View view = findViewById(R.id.photo_upload_progress_layout);if(show){view.setVisibility(View.VISIBLE);View bar = view.findViewById(R.id.photo_upload_progress_bar);LayoutParams params = new LayoutParams();params.height = LayoutParams.FILL_PARENT;params.width = 3;bar.setLayoutParams(params);}else{view.setVisibility(View.GONE);}}

以下是上傳的模組:

public class HttpUploadedFile {/** single instance of this class */private static HttpUploadedFile instance = null;/** * Constructor */private HttpUploadedFile(){}/** * Factory method */public static synchronized HttpUploadedFile getInstance(){if(instance == null){instance = new HttpUploadedFile();}return instance;}String url = "http://2.novelread.sinaapp.com/framework-sae/index.php?c=main&a=getPostBody";private int lastErrCode = 0;// 最近一次出錯的錯誤碼byte[] tmpBuf = new byte[BUF_LEN];byte[] tmpBuf2 = new byte[BUF_LEN * 2];public static final int POST_PROGRESS_NOTIFY = 101;HttpURLConnection connection = null;public static final int HTTP_ARGUMENT_ERR = -1001;// HTTP 參數錯誤public static final int HTTP_RESPONSE_EMPTY = -1002;// Http Response is// Emptypublic static final int HTTP_URL_ERR = -1003;// Url格式錯誤public static final int HTTP_GZIP_ERR = -1004;// 響應資料解壓縮失敗public static final int HTTP_CANCELED = -1005;// 當前下載已取消public static final int HTTP_EXCEPTION = -1006;// 發生異常private boolean bIsStop = false;protected Object objAbort = new Object();private Handler mHandler = null;public static final int TIMEOUT = 30000;// 逾時時間30秒private static final int BUF_LEN = 512;// 資料緩衝長度public boolean doUploadPhoto(Context context, String filePathName,Handler handler) {boolean ret = false;File file = new File(filePathName);if (!file.exists()) {return false;}FileInputStream fs = null;if (file != null) {try {fs = new FileInputStream(file);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (file == null || fs == null) {return false;}mHandler = handler;ret = postWithoutResponse(context, url, fs, (int) file.length());if (fs != null) {try {fs.close();fs = null;} catch (Exception e) {}}return ret;}public Boolean postWithoutResponse(Context context, final String strUrl,InputStream dataStream, int iStreamLen) {  //iStreamLen是FIle的大寫，以位元組作為單位if (TextUtils.isEmpty(strUrl) || dataStream == null || iStreamLen <= 0) {lastErrCode = HTTP_ARGUMENT_ERR;return false;}URL postUrl = null;try {postUrl = new URL(strUrl);} catch (MalformedURLException ex) {Log.e("HttpUtil", "get MalformedURL", ex);lastErrCode = HTTP_URL_ERR;return false;}bIsStop = false;InputStream input = null;DataOutputStream ds = null;ByteArrayOutputStream byteOutStream = null;HttpURLConnection conn = null;byte[] outData = null;try {if (bIsStop) {lastErrCode = HTTP_CANCELED;return false;}conn = getConnection(context, postUrl);connection = conn;conn.setRequestMethod("POST");conn.setDoInput(true);conn.setDoOutput(true);conn.setConnectTimeout(TIMEOUT * 3);conn.setReadTimeout(TIMEOUT * 3);conn.setRequestProperty("Connection", "Keep-Alive");conn.setRequestProperty("Content-Type", "application/octet-stream");conn.setRequestProperty("Content-Length",String.valueOf(iStreamLen));if (bIsStop) {lastErrCode = HTTP_CANCELED;return false;}// get the wifi statusWifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);boolean bWifiEnable = (wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLED);// byte[] data = new byte[BUF_LEN];ds = new DataOutputStream(conn.getOutputStream());int len = 0;int postLen = 0;int nMaxProgress = bWifiEnable ? 80 : 40;while (!bIsStop && ((len = dataStream.read(tmpBuf2)) != -1)) {//如果bIsStop為true,則下面寫檔案到伺服器的過程會終止ds.write(tmpBuf2, 0, len);ds.flush();// waiting for uploading the image file to optimize the progress// bar when using GPRSif (!bWifiEnable) {Thread.sleep(30);}// notify post progresspostLen += len;if (mHandler != null) {Message msg = new Message();msg.what = POST_PROGRESS_NOTIFY;msg.arg1 = (postLen * nMaxProgress) / iStreamLen;//postLen是已經上傳的檔案大小，
nMaxProgress 的作用上增快進度條
mHandler.sendMessage(msg);}}if (bIsStop) {lastErrCode = HTTP_CANCELED;return false;}ds.flush();// waiting for uploading the image file to optimize the progress bar// when using GPRSif (!bWifiEnable) {postLen = 0;while (postLen < iStreamLen) {Thread.sleep(30);// notify post progresspostLen += tmpBuf2.length;if (mHandler != null) {Message msg = new Message();msg.what = POST_PROGRESS_NOTIFY;msg.arg1 = (postLen * 35) / iStreamLen + 50;mHandler.sendMessage(msg);}}}// waiting for the server's responseInputStream is = conn.getInputStream();int ch;StringBuffer res = new StringBuffer();while ((ch = is.read()) != -1) {res.append((char) ch);}if (mHandler != null) {Message msg = new Message();msg.what = POST_PROGRESS_NOTIFY;msg.arg1 = 90;mHandler.sendMessage(msg);}return true;} catch (Exception ex) {Log.e("HttpUtil", "post", ex);if (bIsStop) {lastErrCode = HTTP_CANCELED;} else {lastErrCode = HTTP_EXCEPTION;}return false;} finally {try {outData = null;if (input != null) {input.close();input = null;}// if (ds != null){// ds.close();// ds = null;// }try {ds.close();ds = null;} catch (Exception e) {// TODO: handle exception}if (conn != null) {conn.disconnect();conn = null;}if (byteOutStream != null) {byteOutStream.close();byteOutStream = null;}if (bIsStop) {//如果終止完成後會通知cancel那個方法synchronized (objAbort) {objAbort.notify();}}if (mHandler != null) {Message msg = new Message();msg.what = POST_PROGRESS_NOTIFY;msg.arg1 = 100;mHandler.sendMessage(msg);}} catch (Exception ex) {Log.e("HttpUtil", "post finally", ex);}}}public synchronized void cancel() {try {bIsStop = true;//使用者點擊了cancel button,這個設定bIsStop為trueif (connection != null) {connection.disconnect();connection = null;}synchronized (objAbort) { //只有
postWithoutResponse執行到finally才通知可以執行完這個函數
objAbort.wait(50);}} catch (Exception ex) {Log.v("HttpUtil", "canel", ex);}}private HttpURLConnection getConnection(Context context, URL url)throws Exception {String[] apnInfo = null;WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);int wifiState = wifiManager.getWifiState();HttpURLConnection conn = null;conn = (HttpURLConnection) url.openConnection();//擷取http的串連return conn;}}

代碼在http://download.csdn.net/detail/baidu_nod/7735511