我正在尝试将图像从android上传到远程tomcat服务器。 但是我收到此错误“错误：方法未从超类型重写或实现方法” ，并且不确定为什么会这样。我使用了http://programmerguru.com/android-tutorial/how-to-upload-image-to-java-服务器/教程作为参考。
@SuppressLint("NewApi")
public class FileUploadActivity extends Activity {
ProgressDialog prgDialog;
String encodedString;
RequestParams params = new RequestParams();
String imgPath, fileName;
Bitmap bitmap;
private static int RESULT_LOAD_IMG = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_file_upload);
prgDialog = new ProgressDialog(this);
// Set Cancelable as False
prgDialog.setCancelable(false);
}
public void loadImagefromGallery(View view) {
Intent galleryIntent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, RESULT_LOAD_IMG);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
try {
if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
imgPath = cursor.getString(columnIndex);
cursor.close();
ImageView imgView = (ImageView) findViewById(R.id.imgView);
imgView.setImageBitmap(BitmapFactory
.decodeFile(imgPath));
String fileNameSegments[] = imgPath.split("/");
fileName = fileNameSegments[fileNameSegments.length - 1];
params.put("filename", fileName);
} else {
Toast.makeText(this, "You haven't picked Image",
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG).show();
}
}
public void uploadImage(View v) {
if (imgPath != null && !imgPath.isEmpty()) {
prgDialog.setMessage("Converting Image to Binary Data");
prgDialog.show();
encodeImagetoString();
} else {
Toast.makeText( getApplicationContext(), "You must select image from gallery before you try to upload",Toast.LENGTH_LONG).show();
}
}
public void encodeImagetoString() {
new AsyncTask<Void, Void, String>() {
protected void onPreExecute() {};
@Override
protected String doInBackground(Void... params) {
BitmapFactory.Options options = null;
options = new BitmapFactory.Options();
options.inSampleSize = 3;
bitmap = BitmapFactory.decodeFile(imgPath, options);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
byte[] byte_arr = stream.toByteArray();
encodedString = Base64.encodeToString(byte_arr, 0);
return "";
}
@Override
protected void onPostExecute(String msg) {
prgDialog.setMessage("Calling Upload");
params.put("image", encodedString);
triggerImageUpload();
}
}.execute(null, null, null);
}
public void triggerImageUpload() {
makeHTTPCall();
}
public void makeHTTPCall() {
prgDialog.setMessage("Invoking JSP");
AsyncHttpClient client = new AsyncHttpClient();
client.post("http://myURL:8080/webservice/uploadimg.jsp" ,
params, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers,
byte[] responseBody) {
prgDialog.hide();
Toast.makeText(getApplicationContext(),
responseBody.toString(),
Toast.LENGTH_LONG).show();
}
@Override
public void onFailure(int statusCode, Header[] headers,
byte[] responseBody, Throwable error) {
prgDialog.hide();
if (statusCode == 404) {
Toast.makeText(getApplicationContext(),
"Requested resource not found",
Toast.LENGTH_LONG).show();
}
else if (statusCode == 500) {
Toast.makeText(getApplicationContext(),
"Something went wrong at server end",
Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(getApplicationContext(),"Error Occured n Most Common Error: n1.Device not connected to Internetn2. Web App is not deployed in App servern3. App server is not runningn HTTP Status code : " + statusCode, Toast.LENGTH_LONG).show();
}
}
}
);
}
@Override
protected void onDestroy() {
super.onDestroy();
if (prgDialog != null) {
prgDialog.dismiss();
}
}
}
这些是我的gradle依赖项：
dependencies {
implementation 'com.android.support:multidex:1.0.3'
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-
core:3.0.2'
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation 'com.android.support:leanback-v17:27.1.1'
implementation 'de.hdodenhof:circleimageview:2.1.0'
// libraries for web service --->
// compile 'org.glassfish.jersey.containers:jersey-container-
servlet:2.14'
implementation 'com.google.code.gson:gson:2.8.5'
implementation 'com.squareup.retrofit2:retrofit:2.4.0'
implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
implementation 'com.squareup.retrofit2:converter-scalars:2.3.0'
// <---
//Add Swipe card library
implementation 'com.huxq17.android:SwipeCardsView:1.3.5'
implementation 'com.squareup.picasso:picasso:2.5.2'
compile 'com.loopj.android:android-async-http:1.4.9'
// compile files('libs/activation.jar')
// compile files('libs/additionnal.jar')
// compile files('libs/mail.jar')
implementation files('libs/activation.jar')
implementation files('libs/additionnal.jar')
implementation files('libs/mail.jar')
implementation files('libs/android-async-http-1.4.4.jar')
答案 0 :(得分：0)
我自己解决了此编译错误。从gradle中删除了编译'com.loopj.android:android-async-http:1.4.9'并将AsyncHttpResponseHandler更改为//响应代码'200' @Override public void onSuccess（String response）{ //隐藏进度对话框 prgDialog.hide（）; Toast.makeText（getApplicationContext（），响应， Toast.LENGTH_LONG）.show（）; }
// When the response returned by REST has Http
// response code other than '200' such as '404',
// '500' or '403' etc
@Override
public void onFailure(int statusCode, Throwable error,
String content) {
// Hide Progress Dialog
prgDialog.hide();
// When Http response code is '404'
if (statusCode == 404) {
Toast.makeText(getApplicationContext(),
"Requested resource not found",
Toast.LENGTH_LONG).show();
}
// When Http response code is '500'
else if (statusCode == 500) {
Toast.makeText(getApplicationContext(),
"Something went wrong at server end",
Toast.LENGTH_LONG).show();
}
// When Http response code other than 404, 500
else {
Toast.makeText(
getApplicationContext(),
"Error Occured n Most Common Error: n1. Device not connected to Internetn2. Web App is not deployed in App servern3. App server is not runningn HTTP Status code : "
+ statusCode, Toast.LENGTH_LONG)
.show();
}
}