如何解决此错误？我尽我所能，但我仍然得到这个错误
引起：java.lang.NoClassDefFoundError: info.androidhive.camerafileupload.MyMultiPartEntity
我正在使用这些库
这是我的AsyncTask：
private class UploadFileToServer extends AsyncTask<Void, Integer, String> {
@Override
protected void onPreExecute() {
// setting progress bar to zero
progressBar.setProgress(0);
super.onPreExecute();
}
@Override
protected void onProgressUpdate(Integer... progress) {
// Making progress bar visible
progressBar.setVisibility(View.VISIBLE);
// updating progress bar value
progressBar.setProgress(progress[0]);
// updating percentage value
txtPercentage.setText(String.valueOf(progress[0]) + "%");
}
@Override
protected String doInBackground(Void... params) {
return uploadFile();
}
private String uploadFile() {
String responseString = null;
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(Config.FILE_UPLOAD_URL);
try {
MyMultiPartEntity entity = new MyMultiPartEntity( // Casuing NoClassDefFoundError
new ProgressListener() {
@Override
public void transferred(long num) {
publishProgress((int) ((num / (float) totalSize) * 100));
}
});
File sourceFile = new File(filePath);
// Adding file data to http body
entity.addPart("image", new FileBody(sourceFile));
// Extra parameters if you want to pass to server
entity.addPart("website",
new StringBody("www.androidhive.info"));
entity.addPart("email", new StringBody("abc@gmail.com"));
totalSize = entity.getContentLength();
httppost.setEntity(entity);
// Making server call
HttpResponse response = httpclient.execute(httppost);
HttpEntity r_entity = response.getEntity();
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200) {
// Server response
responseString = EntityUtils.toString(r_entity);
} else {
responseString = "Error occurred! Http Status Code: "
+ statusCode;
}
} catch (ClientProtocolException e) {
responseString = e.toString();
} catch (IOException e) {
responseString = e.toString();
}/* catch(NoClassDefFoundError e){
responseString = e.toString();
}*/
return responseString;
}
@Override
protected void onPostExecute(String result) {
Log.e(TAG, "Response from server: " + result);
// showing the server response in an alert dialog
showAlert(result);
super.onPostExecute(result);
}
}
这是我的Multipart Entity
public class MyMultiPartEntity extends MultipartEntity {
private final ProgressListener listener;
public MyMultiPartEntity(final ProgressListener listener) {
super();
this.listener = listener;
}
public MyMultiPartEntity(final HttpMultipartMode mode,
final ProgressListener listener) {
super(mode);
this.listener = listener;
}
public MyMultiPartEntity(HttpMultipartMode mode, final String boundary,
final Charset charset, final ProgressListener listener) {
super(mode, boundary, charset);
this.listener = listener;
}
@Override
public void writeTo(final OutputStream outStream) throws IOException {
super.writeTo(new CountingOutputStream(outStream, this.listener));
}
public interface ProgressListener {
void transferred(long num);
}
public static class CountingOutputStream extends FilterOutputStream {
private final ProgressListener listener;
private long transferred;
public CountingOutputStream(final OutputStream out,
final ProgressListener listener) {
super(out);
this.listener = listener;
this.transferred = 0;
}
public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
this.transferred += len;
this.listener.transferred(this.transferred);
}
public void write(int b) throws IOException {
out.write(b);
this.transferred++;
this.listener.transferred(this.transferred);
}
}
}
logcat的：
07-03 13:56:05.128 32464-32464/info.androidhive.camerafileupload E/dalvikvm﹕ Could not find class 'info.androidhive.camerafileupload.MyMultiPartEntity', referenced from method info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.uploadFile
07-03 13:56:05.158 32464-32549/info.androidhive.camerafileupload E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: info.androidhive.camerafileupload, PID: 32464
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NoClassDefFoundError: info.androidhive.camerafileupload.MyMultiPartEntity
at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.uploadFile(UploadActivity.java:151)
at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:141)
at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:119)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
摇篮
apply plugin: 'com.android.application'
android {
compileSdkVersion 21
buildToolsVersion "22.0.1"
defaultConfig {
applicationId "info.androidhive.camerafileupload"
minSdkVersion 11
targetSdkVersion 21
}
buildTypes {
release {
minifyEnabled false;
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
productFlavors {
}
}
dependencies {
provided files('libs/httpclient-4.2.5.jar')
provided files('libs/httpcore-4.2.4.jar')
provided files('libs/httpmime-4.2.5.jar')
provided files('libs/android-support-v4.jar')
compile 'com.android.support:appcompat-v7:22.1.1'
}
答案 0 :(得分：1)
我实际上已经将这个精确的教程移植到Android Studio，并遇到了您所面临的同样问题。
在尝试了很多东西来解决之后，这就是我能够让它发挥作用的方式。
使用以下罐子：
然后，在build.gradle中：
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.1.1'
compile('org.apache.httpcomponents:httpmime:4.3.5') {
exclude module: 'httpclient'
}
compile 'org.apache.httpcomponents:httpclient-android:4.3.5.1'
}
GitHub上的完整项目：
答案 1 :(得分：0)
您可以尝试更改依赖关系。
dependencies {
compile files('libs/httpclient-4.2.5.jar')
compile files('libs/httpcore-4.2.4.jar')
compile files('libs/httpmime-4.2.5.jar')
compile files('libs/android-support-v4.jar')
compile 'com.android.support:appcompat-v7:22.1.1'
}
然后，清理并重建项目，然后重试。
在旁注中，compile，package和provided之间的差异如下。 （引自here）
提供 - 仅编译时依赖
package - 仅限打包时间
依赖编译 - 编译时和包时依赖