获得致命异常：使用 Async 类的 AsyncTask #1
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【中文标题】获得致命异常：使用 Async 类的 AsyncTask #1【英文标题】：Getting FATAL exception: AsyncTask #1 on using Async class 【发布时间】：2015-11-16 19:21:05 【问题描述】：我是安卓新手。我已经导入了一个项目，该项目从我的手机拍摄照片，并且应该将它上传到我笔记本电脑的本地主机上。两者都连接到同一个WiFi，它会一直运行，直到我拍照并点击上传，但是当我点击上传时，它崩溃了。这些是我在 log-cat 中遇到的错误。谁能帮我解决一下？
08-22 12:00:43.871: E/androidRuntime(2491): FATAL EXCEPTION: AsyncTask #1
08-22 12:00:43.871: E/AndroidRuntime(2491): java.lang.RuntimeException: An error occured while executing doInBackground()
08-22 12:00:43.871: E/AndroidRuntime(2491): at android.os.AsyncTask$3.done(AsyncTask.java:278)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-22 12:00:43.871: E/AndroidRuntime(2491): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.lang.Thread.run(Thread.java:856)
08-22 12:00:43.871: E/AndroidRuntime(2491): Caused by: java.lang.NoClassDefFoundError: info.androidhive.camerafileupload.AndroidMultiPartEntity
08-22 12:00:43.871: E/AndroidRuntime(2491): at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.uploadFile(UploadActivity.java:156)
08-22 12:00:43.871: E/AndroidRuntime(2491): at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:145)
08-22 12:00:43.871: E/AndroidRuntime(2491): at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:1)
08-22 12:00:43.871: E/AndroidRuntime(2491): at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-22 12:00:43.871: E/AndroidRuntime(2491): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-22 12:00:43.871: E/AndroidRuntime(2491): ... 5 more
包信息.androidhive.camerafileupload;
import info.androidhive.camerafileupload.AndroidMultiPartEntity.ProgressListener;
import java.io.File;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;
public class UploadActivity extends Activity
// LogCat tag
private static final String TAG = MainActivity.class.getSimpleName();
private ProgressBar progressBar;
private String filePath = null;
private TextView txtPercentage;
private ImageView imgPreview;
private VideoView vidPreview;
private Button btnUpload;
long totalSize = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload);
txtPercentage = (TextView) findViewById(R.id.txtPercentage);
btnUpload = (Button) findViewById(R.id.btnUpload);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
imgPreview = (ImageView) findViewById(R.id.imgPreview);
vidPreview = (VideoView) findViewById(R.id.videoPreview);
// Changing action bar background color
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor(getResources().getString(
R.color.action_bar))));
// Receiving the data from previous activity
Intent i = getIntent();
// image or video path that is captured in previous activity
filePath = i.getStringExtra("filePath");
// boolean flag to identify the media type, image or video
boolean isImage = i.getBooleanExtra("isImage", true);
if (filePath != null)
// Displaying the image or video on the screen
previewMedia(isImage);
else
Toast.makeText(getApplicationContext(),
"Sorry, file path is missing!", Toast.LENGTH_LONG).show();
btnUpload.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
// uploading the file to server
new UploadFileToServer().execute();
);
/**
* Displaying captured image/video on the screen
* */
private void previewMedia(boolean isImage)
// Checking whether captured media is image or video
if (isImage)
imgPreview.setVisibility(View.VISIBLE);
vidPreview.setVisibility(View.GONE);
// bimatp factory
BitmapFactory.Options options = new BitmapFactory.Options();
// down sizing image as it throws OutOfMemory Exception for larger
// images
options.inSampleSize = 8;
final Bitmap bitmap = BitmapFactory.decodeFile(filePath, options);
imgPreview.setImageBitmap(bitmap);
else
imgPreview.setVisibility(View.GONE);
vidPreview.setVisibility(View.VISIBLE);
vidPreview.setVideoPath(filePath);
// start playing
vidPreview.start();
/**
* Uploading the file to server
* */
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();
@SuppressWarnings("deprecation")
private String uploadFile()
String responseString = null;
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(Config.FILE_UPLOAD_URL);
try
AndroidMultiPartEntity entity = new AndroidMultiPartEntity(
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();
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);
/**
* Method to show alert dialog
* */
private void showAlert(String message)
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(message).setTitle("Response from Servers")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int id)
// do nothing
);
AlertDialog alert = builder.create();
alert.show();
这是 AndroidMultiPart 类
package info.androidhive.camerafileupload;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
@SuppressWarnings("deprecation")
public class AndroidMultiPartEntity extends MultipartEntity
private final ProgressListener listener;
public AndroidMultiPartEntity(final ProgressListener listener)
super();
this.listener = listener;
public AndroidMultiPartEntity(final HttpMultipartMode mode,
final ProgressListener listener)
super(mode);
this.listener = listener;
public AndroidMultiPartEntity(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 static 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);
【问题讨论】：
你能分享一些错误发生的地方吗？ （第 156 行的 UploadActivity） 第 156 行在尝试后开始，即 protected String doInBackground(Void... params) return uploadFile(); @SuppressWarnings("deprecation") private String uploadFile() String responseString = null; HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = 新 HttpPost(Config.FILE_UPLOAD_URL);尝试 AndroidMultiPartEntity entity = new AndroidMultiPartEntity( new ProgressListener() @Override public void transfer(long num) publishProgress((int) ((num / (float) totalSize) * 100)); ); 它找不到AndroidMultiPartEntity类，尝试清理然后重建它。 我也添加了那个类 【参考方案1】：虽然特定的 jar/aar 可能会添加到项目中，但仍必须告知 Android Studio 其存在。您是否在应用的 build.gradle 文件中添加了依赖项并单击了“同步 gradle”？
编辑
关于 Eclipse 中的 NoClassDefFoundError，我刚刚发现 this article 可能很有趣。
【讨论】：
哦，我错过了。在那种情况下，我的遮阳篷就没用了。【参考方案2】：我看到一个 NoClassDefFoundError，你在编译之前尝试过旧的“清洁项目”吗？
【讨论】：
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