问题
I have a simple class written in Android Studio:
package com.mysite.myapp;
import org.apache.http.client.HttpClient;
public class Whatever {
public void headBangingAgainstTheWallExample () {
HttpClient client = new DefaultHttpClient();
}
}
and from this I get the following compile time error:
Cannot resolve symbol HttpClient
Isn't HttpClient included in the Android Studio SDK? Even if it is not, I added it to my Gradle build like this:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.0.0'
compile 'org.apache.httpcomponents:httpclient:4.5'
}
With or without the last compile line, the error is the same. What am I missing?
回答1:
HttpClient is not supported any more in sdk 23. You have to use URLConnection or downgrade to sdk 22 (compile 'com.android.support:appcompat-v7:22.2.0')
If you need sdk 23, add this to your gradle:
android {
useLibrary 'org.apache.http.legacy'
}
You also may try to download and include HttpClient jar directly into your project or use OkHttp instead
回答2:
HttpClient was deprecated in API Level 22 and removed in API Level 23. You can still use it in API Level 23 and onwards if you must, however it is best to move to supported methods to handle HTTP. So, if you're compiling with 23, add this in your build.gradle:
android {
useLibrary 'org.apache.http.legacy'
}
回答3:
TejaDroid's answer in below link helped me . Can't import org.apache.http.HttpResponse in Android Studio
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:23.0.1'
compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
...
}
回答4:
To use Apache HTTP for SDK Level 23:
Top level build.gradle - /build.gradle
buildscript {
...
dependencies {
classpath 'com.android.tools.build:gradle:1.5.0'
// Lowest version for useLibrary is 1.3.0
// Android Studio will notify you about the latest stable version
// See all versions: http://jcenter.bintray.com/com/android/tools/build/gradle/
}
...
}
Notification from Android studio about gradle update:
Module specific build.gradle - /app/build.gradle
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
...
useLibrary 'org.apache.http.legacy'
...
}
回答5:
Try this worked for me Add this dependency to your build.gradle File
compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
回答6:
1- download Apache jar files (as of this answer) 4.5.zip file from:
https://hc.apache.org/downloads.cgi?Preferred=http%3A%2F%2Fapache.arvixe.com%2F
2- open the zip copy the jar files into your libs folder. You can find it if you go to the top of your project where it says "Android" you'll find a list when u click it. So,
Android -> Project -> app -> libs
,Then put jars there.
3- In build.gradle (Module: app) add
compile fileTree(dir: 'libs', include: ['*.jar'])
in
dependency {
}
4- In the java class add these imports:
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreProtocolPNames;
回答7:
HttpClient is not supported any more in sdk 23. Android 6.0 (API Level 23) release removes support for the Apache HTTP client. You have to use
android {
useLibrary 'org.apache.http.legacy'
.
.
.
and also add below code snippet in your dependency :
//http final solution for web-service (including file uploading)
compile('org.apache.httpcomponents:httpmime:4.3.6') {
exclude module: 'httpclient'
}
compile 'org.apache.httpcomponents:httpclient-android:4.3.5'
It will also help you while you use Use MultipartEntity for File upload.
回答8:
in API 22 they become deprecated and in API 23 they removed them completely, a simple workaround if you don't need all the fancy stuff from the new additions is to simply use the .jar files from apache that were integrated before API 22, but as separated .jar files:
1. http://hc.apache.org/downloads.cgi
2. download httpclient 4.5.1, the zile file
3. unzip all files
4. drag in your project httpclient-4.5.1.jar, httpcore-4.4.3.jar and httpmime-4.5.1.jar
5. project, right click, open module settings, app, dependencies, +, File dependency and add the 3 files
6. now everything should compile properly
回答9:
If you want import some class like :
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
You can add the following line in the build.gradle (Gradle dependencies)
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.0'
implementation 'com.android.support:support-v4:27.1.0'
.
.
.
implementation 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
}
回答10:
You can simply add this to Gradle dependencies:
compile "org.apache.httpcomponents:httpcore:4.3.2"
回答11:
Android 6.0 (API Level 23) release removes support for the Apache HTTP client. Hence you can not use this library directly in API 23. But there is a way to use it. Add useLibrary ‘org.apache.http.legacy’ in your build.gradle file as below-
android {
useLibrary 'org.apache.http.legacy'
}
If this does not work you may apply the following hack-
– Copy org.apache.http.legacy.jar which is in /platforms/android-23/optional path of your Android SDK directory to your project’s app/libs folder.
– Now Add compile files(‘libs/org.apache.http.legacy.jar’) inside dependencies{} section of build.gradle file.
回答12:
ApacheHttp Client is removed in v23 sdk. You can use HttpURLConnection or third party Http Client like OkHttp.
ref : https://developer.android.com/preview/behavior-changes.html#behavior-apache-http-client
回答13:
Simply use this :-
android {
.
.
.
useLibrary 'org.apache.http.legacy'
.
.
.
}
回答14:
HttpClient is not supported in sdk 23 and 23+.
If you need to use into sdk 23, add below code to your gradle:
android {
useLibrary 'org.apache.http.legacy'
}
Its working for me. Hope useful for you.
回答15:
If you need sdk 23, add this to your gradle:
android {
useLibrary 'org.apache.http.legacy'
}
回答16:
You have to add just one line
useLibrary 'org.apache.http.legacy'
into build.gradle(Module: app), for example
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "25.0.0"
useLibrary 'org.apache.http.legacy'
defaultConfig {
applicationId "com.avenues.lib.testotpappnew"
minSdkVersion 15
targetSdkVersion 24
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
testCompile 'junit:junit:4.12'
}
回答17:
Which API target do you have within your project?AndroidHttpClientis only for API Level 8 <.
and please have a look on here
enjoy your code:)
回答18:
As mentioned before, org.apache.http.client.HttpClient is not supported any more in:
SDK (API level) #23.
You have to use java.net.HttpURLConnection.
If you want to make your code (and life) easier when using HttpURLConnection, here is a Wrapper of this class that will let you do simple operations with GET, POST and PUT using JSON, like for example, doing a HTTP PUT.
HttpRequest request = new HttpRequest(API_URL + PATH).addHeader("Content-Type", "application/json");
int httpCode = request.put(new JSONObject().toString());
if (HttpURLConnection.HTTP_OK == httpCode) {
response = request.getJSONObjectResponse();
} else {
// log error
}
httpRequest.close()
Feel free to use it.
package com.calculistik.repository;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
* <p>
* Copyright © 2017, Calculistik . All rights reserved.
* <p>
* Oracle and Java are registered trademarks of Oracle and/or its
* affiliates. Other names may be trademarks of their respective owners.
* <p>
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common
* Development and Distribution License("CDDL") (collectively, the
* "License"). You may not use this file except in compliance with the
* License. You can obtain a copy of the License at
* https://netbeans.org/cddl-gplv2.html or
* nbbuild/licenses/CDDL-GPL-2-CP. See the License for the specific
* language governing permissions and limitations under the License.
* When distributing the software, include this License Header
* Notice in each file and include the License file at
* nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this particular file
* as subject to the "Classpath" exception as provided by Oracle in the
* GPL Version 2 section of the License file that accompanied this code. If
* applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
* <p>
* Contributor(s):
* Created by alejandro tkachuk @aletkachuk
* www.calculistik.com
*/
public class HttpRequest {
public static enum Method {
POST, PUT, DELETE, GET;
}
private URL url;
private HttpURLConnection connection;
private OutputStream outputStream;
private HashMap<String, String> params = new HashMap<String, String>();
public HttpRequest(String url) throws IOException {
this.url = new URL(url);
connection = (HttpURLConnection) this.url.openConnection();
}
public int get() throws IOException {
return this.send();
}
public int post(String data) throws IOException {
connection.setDoInput(true);
connection.setRequestMethod(Method.POST.toString());
connection.setDoOutput(true);
outputStream = connection.getOutputStream();
this.sendData(data);
return this.send();
}
public int post() throws IOException {
connection.setDoInput(true);
connection.setRequestMethod(Method.POST.toString());
connection.setDoOutput(true);
outputStream = connection.getOutputStream();
return this.send();
}
public int put(String data) throws IOException {
connection.setDoInput(true);
connection.setRequestMethod(Method.PUT.toString());
connection.setDoOutput(true);
outputStream = connection.getOutputStream();
this.sendData(data);
return this.send();
}
public int put() throws IOException {
connection.setDoInput(true);
connection.setRequestMethod(Method.PUT.toString());
connection.setDoOutput(true);
outputStream = connection.getOutputStream();
return this.send();
}
public HttpRequest addHeader(String key, String value) {
connection.setRequestProperty(key, value);
return this;
}
public HttpRequest addParameter(String key, String value) {
this.params.put(key, value);
return this;
}
public JSONObject getJSONObjectResponse() throws JSONException, IOException {
return new JSONObject(getStringResponse());
}
public JSONArray getJSONArrayResponse() throws JSONException, IOException {
return new JSONArray(getStringResponse());
}
public String getStringResponse() throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
StringBuilder response = new StringBuilder();
for (String line; (line = br.readLine()) != null; ) response.append(line + "\n");
return response.toString();
}
public byte[] getBytesResponse() throws IOException {
byte[] buffer = new byte[8192];
InputStream is = connection.getInputStream();
ByteArrayOutputStream output = new ByteArrayOutputStream();
for (int bytesRead; (bytesRead = is.read(buffer)) >= 0; )
output.write(buffer, 0, bytesRead);
return output.toByteArray();
}
public void close() {
if (null != connection)
connection.disconnect();
}
private int send() throws IOException {
int httpStatusCode = HttpURLConnection.HTTP_BAD_REQUEST;
if (!this.params.isEmpty()) {
this.sendData();
}
httpStatusCode = connection.getResponseCode();
return httpStatusCode;
}
private void sendData() throws IOException {
StringBuilder result = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {
result.append((result.length() > 0 ? "&" : "") + entry.getKey() + "=" + entry.getValue());//appends: key=value (for first param) OR &key=value(second and more)
}
sendData(result.toString());
}
private HttpRequest sendData(String query) throws IOException {
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
writer.write(query);
writer.close();
return this;
}
}
回答19:
Add these two lines under dependencies
compile 'org.apache.httpcomponents:httpcore:4.4.1'
compile 'org.apache.httpcomponents:httpclient:4.5'
then
useLibrary 'org.apache.http.legacy'
under the android
回答20:
Another way is if you have httpclient.jar file then you can do this :
Paste your .jar file in "libs folder" in your project. Then in gradle add this line in your build.gradle(Module:app)
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:23.0.0'
compile files('libs/httpcore-4.3.3.jar')
}
回答21:
Error:(30, 0) Gradle DSL method not found: 'classpath()' Possible causes:
回答22:
I think depending on which Android Studio version you have, it's important you update your android studio as well, i was becoming frustrated too following everyone's advice but no luck, until i had to upgrade my android version from 1.3 to 1.5, the errors disappeared like magic.
来源：https://stackoverflow.com/questions/32153318/httpclient-wont-import-in-android-studio