製作一個複雜通用的圖片上傳介面
效果圖如下:
首先我們先把圖片載入到記憶體中，這個過程需要壓縮的圖片的尺寸
private class LoadPhotoTask extends AsyncTask<Void, Void, Boolean>{
private Bitmap mLoadedBitmap = null;
protected Boolean doInBackground(Void... params) {
try {
if(mFilePathName.length() > 0){
File file = new File(mFilePathName);
if (!file.exists()) {
return false;
}
BitmapFactory.Options opt = new BitmapFactory.Options();
long fileSize = file.length();
int maxSize = 2*1024 * 1024;
if(fileSize <= maxSize){
opt.inSampleSize = 1;
}else if(fileSize <= maxSize * 4){
opt.inSampleSize = 2;
}else{
long times = fileSize / maxSize;
opt.inSampleSize = (int)(Math.log(times) / Math.log(2.0)) + 1;
}
try{
mLoadedBitmap = BitmapFactory.decodeFile(mFilePathName,opt);
mUploadFilePathName = SaveBitmapToFile(mLoadedBitmap);
}catch(OutOfMemoryError e){
Toast.makeText(UploadPhotoActivity.this,
getResources().getString(R.string.no_memory_to_view_photo),
Toast.LENGTH_SHORT).show();
UploadPhotoActivity.this.finish();
}
}
return true;
} catch (Exception e) {
Log.e("UploadPhotoActivity", "doInBackground", e);
return false;
}
}
protected void onPostExecute(Boolean result){
try {
showLoadPreviewProgressBar(false);
if(mLoadedBitmap != null){
ImageView IamgePreView = (ImageView)findViewById(R.id.photo_upload_preview_image);
IamgePreView.setImageBitmap(mLoadedBitmap);
}else{
}
mLoadedBitmap = null;
} catch (Exception e) {
Log.e("UploadPhotoActivity", "onPostExecute", e);
}
}
}
因為需要把圖片上傳伺服器，所以我們重新按比例壓縮bitmap,create一個新的bitmap儲存到sd上
private String SaveBitmapToFile(Bitmap bmp){
if (null == bmp) {
return null;
}
String fileName = "upload_tmp.jpg";
File f = this.getFileStreamPath(fileName);//data/data/com.example.tianqitongtest/files/upload_tmp.jpg
if (f.exists()) {
f.delete();
}
FileOutputStream ostream;
try {
int targetWidth = 780;
int w = bmp.getWidth();
if (w > targetWidth) {
int h = bmp.getHeight();
int targetHeight = (targetWidth * h) / w;
bmp = Bitmap.createScaledBitmap(bmp, targetWidth, targetHeight,
true);
}
ostream = this.openFileOutput(fileName, MODE_PRIVATE);
bmp.compress(Bitmap.CompressFormat.JPEG, 70, ostream);
ostream.flush();
ostream.close();
ostream = null;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return f.getAbsolutePath();
}
按上傳按鈕的時候，把圖片上傳伺服器
private class UploadPhotoTask extends AsyncTask<String, Void, Boolean>{
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();
}
}
}
上傳圖片的程式碼是:
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) {
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)) {
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;
msg.arg1 = (postLen * nMaxProgress) / iStreamLen;
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 GPRS
if (!bWifiEnable) {
postLen = 0;
while (postLen < iStreamLen) {
Thread.sleep(30);
// notify post progress
postLen += 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 response
InputStream 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) {
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);
}
}
}
程式碼在
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/2144/viewspace-2818549/，如需轉載，請註明出處，否則將追究法律責任。
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