android一个上传图片的样例,包含怎样终止上传过程，假设在上传的时候更新进度条(二)

能够这样来实现上传:

activity中运行:

private class UploadPhotoTask extends AsyncTask<String, Void, Boolean>{

@Override
protected 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();

}
}
}

写一个handle来更新进度条:

/** Handler to get notify from upload photo engine*/
private Handler mHandler = new Handler() {
@Override
public 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(); <strong>//这个是进度条所在的parent layout的宽度</strong>
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);  //更新进度条的宽度
}

/**
* 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);
}
}

下面是上传的模块:

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;// 近期一次出错的错误代码
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 參数错误
public static final int HTTP_RESPONSE_EMPTY = -1002;// Http Response is
// Empty
public static final int HTTP_URL_ERR = -1003;// Url格式错误
public static final int HTTP_GZIP_ERR = -1004;// 响应数据解压缩失败
public static final int HTTP_CANCELED = -1005;// 当前下载已取消
public static final int HTTP_EXCEPTION = -1006;// 发生异常
private boolean bIsStop = false;
protected Object objAbort = new Object();

private Handler mHandler = null;
public static final int TIMEOUT = 30000;// 超时时间30秒
private static final int BUF_LEN = 512;// 数据缓冲长度

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 block
e.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) { <strong> //<span style="font-family: Arial, Helvetica, sans-serif;">iStreamLen是FIle的大写，以字节作为单位</span></strong>

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 status
WifiManager 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)) {<strong>//假设bIsStop为true,则以下写文件到server的过程会终止</strong>
ds.write(tmpBuf2, 0, len);
ds.flush();
// waiting for uploading the image file to optimize the progress
// bar when using GPRS
if (!bWifiEnable) {
Thread.sleep(30);
}

// notify post progress
postLen += len;
if (mHandler != null) {
Message msg = new Message();
msg.what = POST_PROGRESS_NOTIFY;
<strong>msg.arg1 = (postLen * nMaxProgress) / iStreamLen;//postLen是已经上传的文件大小，</strong><pre name="code" class="java">nMaxProgress 的作用上增快进度条

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) {
//假设终止完毕后会通知cancel那个方法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;//用户点击了cancel button,这个设置bIsStop为trueif (connection != null) {connection.disconnect();connection = null;}synchronized (objAbort) { //仅仅有

postWithoutResponse运行到finally才通知能够运行完这个函数

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();//获取http的连接return conn;}}

代码在http://download.csdn.net/detail/baidu_nod/7735511