在我的应用程序中，我正在捕获图像并将其上传到服务器。捕获和上传部分在我的 5 兆像素 Android 设备上工作正常。
但是拍照时应用偶尔会崩溃。我们注意到如果有人拿 具有高百万像素设置的图片，照片无法上传且应用程序崩溃。
如何减小 8 兆像素照片的大小，以便能够在不崩溃的情况下上传？ 我是否必须压缩捕获的图像。以下是我捕获图像的代码
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE,fileName);
mCapturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.ACTION_IMAGE_CAPTURE, capturedImage);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
startActivityForResult(intent, 3);
我在OnActivity Result中上传图片如下
public void onActivityResult(int requestCode, int resultCode, final Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 3)
{
String[] projection = { MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery(mCapturedImageURI, projection, null, null, null);
int column_index_data = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
capturedImage = cursor.getString(column_index_data);
String url = "http://xxxxxxxxxxxxxx.com/device_upload.php";
new ProfileAddImageFileAsync().execute(url);
}
}
我正在运行一个进度对话框，直到上传完成，如下所示
class ProfileAddImageFileAsync extends AsyncTask<String, String, String>
{
@Override
protected void onPreExecute()
{
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
protected String doInBackground(String... Aurl)
{
HttpURLConnection connection = null;
DataOutputStream outputStream = null;
DataInputStream inStream = null;
try
{
URL urlServer = new URL(aurl[0]);
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
int maxBufferSize = 1*1024*1024;
FileInputStream fileInputStream = new FileInputStream(new File(capturedImage) );
connection = (HttpURLConnection) urlServer.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
outputStream = new
DataOutputStream( connection.getOutputStream() );
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"userfile\";filename=\"" + capturedImage +"\"" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
Log.e("bytesAvailable ",""+bytesAvailable);
bufferSize = Math.min(bytesAvailable, maxBufferSize);
Log.e("bufferSize ",""+bufferSize);
byte[] buffer = new byte[bufferSize];
Log.e("bufer ",""+buffer);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens +lineEnd);
@SuppressWarnings("unused")
int serverResponseCode = connection.getResponseCode();
@SuppressWarnings("unused")
String serverResponseMessage = connection.getResponseMessage();
fileInputStream.close();
outputStream.flush();
outputStream.close();
}
catch (Exception ex)
{
Log.e("SD Card image upload error: ","" + ex.getMessage());
}
try
{
inStream = new DataInputStream ( connection.getInputStream() );
String str;
while (( str = inStream.readLine()) != null)
{
IMAGE_RESPONSE = str;
ServerPost(str);
}
inStream.close();
}
catch (IOException ioex)
{
Log.e("SD card doFile upload error: ","" + ioex.getMessage());
}
return null;
}
protected void onProgressUpdate(String... Progress)
{
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
protected void onPostExecute(String unused)
{
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
}
请帮助我的 friend ，上面的代码是我在 5MP 相机中的工作代码。
最佳答案
我有这样的解决方案，我用它来捕获和压缩图像。
以下是我的相机部分
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
file = new File(Environment.getExternalStorageDirectory(), String.valueOf(System.currentTimeMillis()) + ".jpg");
Log.e("ffffffffffiiiiiiiiilllllllllle ",""+file);
f = String.valueOf(file);
mCapturedImageURI = Uri.fromFile(file);
Log.e("outputFileUri ",""+mCapturedImageURI);
setupImage(intent);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
startActivityForResult(intent, 3);
我在OnActivity Result中上传图片如下
public void onActivityResult(int requestCode, int resultCode, final Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 3)
{
capturedImage = f;
String url = "http://xxxxxxxxxxxxxx.com/device_upload.php";
new ProfileAddImageFileAsync().execute(url);
}
}
我正在运行一个进度对话框，直到上传完成，如下所示
class ProfileAddImageFileAsync extends AsyncTask<String, String, String>
{
@Override
protected void onPreExecute()
{
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
protected String doInBackground(String... aurl)
{
HttpURLConnection connection = null;
DataOutputStream outputStream = null;
DataInputStream inStream = null;
try
{
URL urlServer = new URL(aurl[0]);
Log.e("URl image uploading ",""+urlServer);
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
int maxBufferSize = 1*1024*1024;
Log.e("maxBufferSize ",""+maxBufferSize);
FileInputStream fileInputStream = new FileInputStream(new File(capturedImage) );
connection = (HttpURLConnection) urlServer.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
Log.e("FileInput Stream in image upload ",""+fileInputStream);
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
outputStream = new
DataOutputStream( connection.getOutputStream() );
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"userfile\";filename=\"" + capturedImage +"\"" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
Log.e("bytesAvailable ",""+bytesAvailable);
bufferSize = Math.min(bytesAvailable, maxBufferSize);
Log.e("bufferSize ",""+bufferSize);
byte[] buffer = new byte[bufferSize];
Log.e("bufer ",""+buffer);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens +lineEnd);
@SuppressWarnings("unused")
int serverResponseCode = connection.getResponseCode();
@SuppressWarnings("unused")
String serverResponseMessage = connection.getResponseMessage();
fileInputStream.close();
outputStream.flush();
outputStream.close();
}
catch (Exception ex)
{
Log.e("SD Card image upload error: ","" + ex.getMessage());
}
try
{
inStream = new DataInputStream ( connection.getInputStream() );
String str;
while (( str = inStream.readLine()) != null)
{
Log.e("ImageResponse ",""+str);
Appconstant.IMAGE_RESPONSE = str;
ProImgServerPost(str);
Log.e("ProImgServerPost ","added");
AddImgServerPost(str);
Log.e("AddImgServerPost ","added");
}
inStream.close();
}
catch (IOException ioex)
{
Log.e("SD card doFile upload error: ","" + ioex.getMessage());
}
return null;
}
protected void onProgressUpdate(String... progress)
{
Log.e("ANDRO_ASYNC",""+progress[0]);
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
// Bitmap bMap = BitmapFactory.decodeFile(capturedImage);
// ProfileImgPreview.setImageBitmap(bMap);
}
protected void onPostExecute(String unused)
{
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
Bitmap bMap = BitmapFactory.decodeFile(capturedImage);
ProfileImgPreview.setImageBitmap(bMap);
}
}
关于android - 在 Android 应用程序中将图像上传到服务器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7344121/