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我已經看了其他問題，但這個錯誤似乎代碼特定，所以我有點沮喪。我一直在一個應用程序，簡單地反向谷歌搜索某個圖像。AsynckTask運行時異常doInBackground
MainActivity
package com.example.ygoc95.myapplication;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import org.json.JSONObject;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URL;
import static android.R.attr.bitmap;
import org.jibble.simpleftp.*;
public class MainActivity extends AppCompatActivity {
private File resim;
private String path,yol;
private ImageView iv;
private Bitmap bm;
private Button send;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
send = (Button) findViewById(R.id.uploadButton);
iv = (ImageView) findViewById(R.id.resim);
Bitmap bm = BitmapFactory.decodeResource(this.getResources(), R.drawable.url);
iv.setImageBitmap(bm);
path = Environment.getExternalStorageDirectory().toString();
resim = new File(path, "url.jpg");
OutputStream fOut = null;
try {
fOut = new FileOutputStream(resim);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
bm.compress(Bitmap.CompressFormat.JPEG, 85, fOut);
try {
fOut.flush();
fOut.close();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
protected void onStart() {
super.onStart();
send.setOnClickListener((new View.OnClickListener() {
@Override
public void onClick(View paramV) {
Context a=getApplicationContext();
new async(a).execute(resim);
}
}));
}
}
AsyckTask
package com.example.ygoc95.myapplication;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Environment;
import android.support.annotation.NonNull;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.MathContext;
@SuppressWarnings("deprecation")
public class async extends AsyncTask<File,File,File> {
private static final String UPLOAD_IMAGE_URL = "https://www.google.ca/searchbyimage/upload";
private Context mContext;
public String resultsURL;
public async(Context a) {
mContext=a;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
private HttpResponse uploadImage(File imageFile) throws IOException {
HttpPost post = new HttpPost(UPLOAD_IMAGE_URL);
HttpClientParams.setRedirecting(post.getParams(), false);
org.apache.http.entity.mime.MultipartEntity entity = new org.apache.http.entity.mime.MultipartEntity();
entity.addPart("encoded_image", new FileBody(imageFile));
entity.addPart("image_url",new StringBody(""));
entity.addPart("image_content",new StringBody(""));
entity.addPart("filename",new StringBody(""));
entity.addPart("h1",new StringBody("en"));
entity.addPart("bih",new StringBody("179"));
entity.addPart("biw",new StringBody("1600"));
post.setEntity(entity);
HttpResponse response = new DefaultHttpClient().execute(post);
return response;
}
private File exportToInternalStorage(Bitmap bitmap, String name) {
File resizedImageFile = new File(Environment.getExternalStorageDirectory().toString(),"face.png");
try {
FileOutputStream fOut = new FileOutputStream(resizedImageFile);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
fOut.flush();
fOut.close();
} catch (Exception e) { // TODO
e.printStackTrace();
}
return resizedImageFile;
}
private String getResultsURL(HttpResponse response) throws IOException {
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String resultsURL = "";
try {
String line;
while ((line = rd.readLine()) != null) {
if (line.indexOf("https://www.google.ca/search?tbs=sbi") > 0) {
resultsURL = line.substring(9, line.length() - 12);
continue;
}
}
} finally {
rd.close();
}
return resultsURL;
}
private void openResultsPage(String resultsURL) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(resultsURL));
mContext.startActivity(browserIntent);
}
@Override
protected File doInBackground(File... params) {
File image =params[0];
String fileyol=image.getAbsolutePath();
Bitmap shrunkBitmap= BitmapFactory.decodeFile(fileyol);
File resizedImage = exportToInternalStorage(shrunkBitmap, "resized_" + System.currentTimeMillis());
String path = resizedImage.getAbsolutePath();
HttpResponse response = null;
try {
response = uploadImage(resizedImage);
resultsURL = getResultsURL(response);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(File file) {
super.onPostExecute(file);
openResultsPage(resultsURL);
}
}
logcat的
04-24 15:19:32.538 5194-5344/com.example.ygoc95.myapplication E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.NoClassDefFoundError: org.apache.http.entity.ContentType
at org.apache.http.entity.mime.content.FileBody.<init>(FileBody.java:89)
at com.example.ygoc95.myapplication.async.uploadImage(async.java:60)
at com.example.ygoc95.myapplication.async.doInBackground(async.java:135)
at com.example.ygoc95.myapplication.async.doInBackground(async.java:38)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
代碼可凌亂一點，因爲我嘗試過許多其他的東西，deleted.At錯誤就結束說引起：java.lang.NoClassDefFoundError：org.apache.http.entity.ContentType，但我不知道如果這與它有任何關係。我將活動意圖改爲發佈執行，（在UI中，UI代碼可能很危險），但它沒有幫助。我真的很感謝任何幫助/指導，我對Android編程很陌生如果可能有簡單的錯誤。
謝謝！
你能編輯你原來的帖子來包含你的Logcat輸出嗎？ –
'NoClassDefFoundError'表示您正在引用無法找到的類。由於Android 5（我認爲）'org.apache.http'中的所有內容都被棄用了。但是，在聲明AsyncTask時，您禁止棄用警告：'@SuppressWarnings（「deprecation」）'。你可以在依賴關係範圍內添加到你的gradle文件中，我認爲這是你可以嘗試的方法：'useLibrary'org.apache.http.legacy''。我會建議，儘管停止使用這些類，並轉到「HttpConnection」 – 0xDEADC0DE
@德魯哦，對不起。現在編輯 –