我正在尝试使用异步来提高效率，并允许将图像上传到我的网络服务器，我尝试了各种方法，但总有一些方法不起作用......
这是我的最新代码，但返回 Int 时遇到问题，如果我更改
AsyncTask Int 然后它会出错，因为传递给它的 imagePath 是一个 String...
这是错误
Type mismatch: cannot convert from int to String
对于返回0并返回serverResponseCode；
public class wardrobe extends Activity implements OnClickListener {
// set variable for the fields
private EditText nameField, sizeField, colorField, quantityField;
private Spinner typeField, seasonField;
private ImageView imageview;
private ProgressBar progressBarField;
private TextView imageTextSelect, resImage;
private ProgressDialog progressDialog = null;
private int serverResponseCode = 0;
private Button uploadImageButton, postWardrobe;
private String upLoadServerUri = null;
private String imagepath = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wardrobe);
// image upload stuff
imageview = (ImageView) findViewById(R.id.user_photo);
imageTextSelect = (TextView) findViewById(R.id.imageTextSelect);
// button for upload image
uploadImageButton = (Button) findViewById(R.id.uploadImageButton);
// button for posting details
postWardrobe = (Button) findViewById(R.id.postButton);
uploadImageButton.setOnClickListener(this);
postWardrobe.setOnClickListener(this);
@Override
public void onClick(View v) {
if (v == uploadImageButton) {
// below allows you to open the phones gallery
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(
Intent.createChooser(intent, "Complete action using"), 1);
}
if (v == postWardrobe) {
// validate input and that something was entered
if (nameField.getText().toString().length() < 1
|| colorField.getText().toString().length() < 1
|| sizeField.getText().toString().length() < 1
|| quantityField.getText().toString().length() < 1) {
// missing required info (null was this but lets see)
Toast.makeText(getApplicationContext(),
"Please complete all sections!", Toast.LENGTH_LONG)
.show();
} else {
JSONObject dataWardrobe = new JSONObject();
try {
dataWardrobe.put("type", typeField.getSelectedItem()
.toString());
dataWardrobe.put("color", colorField.getText().toString());
dataWardrobe.put("season", seasonField.getSelectedItem()
.toString());
dataWardrobe.put("size", sizeField.getText().toString());
dataWardrobe.put("quantity", quantityField.getText()
.toString());
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// make progress bar visible
progressBarField.setVisibility(View.VISIBLE);
// execute the post request
new dataSend().execute(dataWardrobe);
// image below
progressDialog = ProgressDialog.show(wardrobe.this, "",
"Uploading file...", true);
imageTextSelect.setText("uploading started.....");
new Thread(new Runnable() {
public void run() {
doFileUpload(imagepath);
}
}).start();
}
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK && requestCode == 1) {
// Bitmap photo = (Bitmap) data.getData().getPath();
Uri selectedImageUri = data.getData();
imagepath = getPath(selectedImageUri);
Bitmap bitmap = BitmapFactory.decodeFile(imagepath);
imageview.setImageBitmap(bitmap);
// add to text view what was added
imageTextSelect.setText("Uploading file path: " + imagepath);
}
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null,
null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
这是我正在努力解决的部分:
public int doFileUpload(String sourceFileUri) {
String upLoadServerUri = "http://10.0.2.2/wardrobe";
String fileName = imagepath;
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File sourceFile = new File(imagepath);
if (!sourceFile.isFile()) {
progressDialog.dismiss();
Log.e("uploadFile", "Source File not exist :" + imagepath);
runOnUiThread(new Runnable() {
public void run() {
imageTextSelect.setText("Source File not exist :"
+ imagepath);
}
});
return 0;
} else {
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(
sourceFile);
URL url = new URL(upLoadServerUri);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("uploaded_file", fileName);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ fileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Log.i("uploadFile", "HTTP Response is : "
+ serverResponseMessage + ": " + serverResponseCode);
if (serverResponseCode == 200) {
runOnUiThread(new Runnable() {
public void run() {
String msg = "File Upload Completed.\n\n See uploaded file here : \n\n"
+ " F:/wamp/wamp/www/uploads";
imageTextSelect.setText(msg);
Toast.makeText(wardrobe.this,
"File Upload Complete.", Toast.LENGTH_SHORT)
.show();
}
});
}
// close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
progressDialog.dismiss();
ex.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
imageTextSelect
.setText("MalformedURLException Exception : check script url.");
Toast.makeText(wardrobe.this, "MalformedURLException",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
progressDialog.dismiss();
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
imageTextSelect.setText("Got Exception : see logcat ");
Toast.makeText(wardrobe.this,
"Got Exception : see logcat ",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server Exception",
"Exception : " + e.getMessage(), e);
}
progressDialog.dismiss();
return serverResponseCode;
} // End else block
}
最佳答案
我在这里看到了很多问题。首先，你几乎从来不想(如果有的话)调用 runOnUiThread()来自AsyncTask 。 AsyncTask的每一个方法运行于 UI除了 doInBackground()所以这通常是不需要的，并且经常会导致问题。更新UI根据您正在做的事情使用正确的方法。
第二，我认为你误解了什么doInBackground()正在返回。其结果返回为onPostExecute()这是第三个param在你的类声明中
private class doFileUpload extends AsyncTask <String, Void, String> {
所以这意味着 onPostExecute() (我没有看到你压倒一切)应该期待 String这就是 doInBackground()应该return 。所以你应该转换你的 return变量为String如果你想通过 String至onPostExecute()
通常
progressDialog.dismiss();
在 onPostExecute() 中调用和
progressDialog.show();
将在 onPreExecute() 中调用当使用AsyncTask时。那么你就不必创建一个新的 Thread在你的onClick() .
关于java - 尝试使用异步将图像上传到 Android 网络服务器？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21192778/