我有一个简单的类写在Android Studio:

package com.mysite.myapp;

import org.apache.http.client.HttpClient;

public class Whatever {
    public void headBangingAgainstTheWallExample () {
        HttpClient client = new DefaultHttpClient();
    }
}

从这里我得到了以下编译时错误:

无法解析HttpClient符号

HttpClient不是包含在Android Studio SDK中吗?即使不是,我也像这样把它添加到我的Gradle构建中:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.0'
    compile 'org.apache.httpcomponents:httpclient:4.5'
}

不管有没有最后一个编译行,错误都是一样的。我错过了什么?


当前回答

另一种方法是如果你有httpclient。jar文件你就可以 这样的:

将.jar文件粘贴到项目的“libs文件夹”中。然后在gradle中添加这一行到build.gradle(模块: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')
}

其他回答

试试这个 为我工作 将此依赖项添加到构建中。gradle文件

compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'

如果你想导入一些类,比如:

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;

您可以在构建中添加以下行。gradle (gradle依赖项)

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'

}

适用于android API 28及更高版本 在Manifest.xml应用程序标签内

    <application
    .
    .
    .

    <uses-library android:name="org.apache.http.legacy" android:required="false"/>

在API 22中,它们被弃用了,在API 23中,它们被完全删除了,如果你不需要新添加的所有花哨的东西,一个简单的解决方法是简单地使用API 22之前集成的apache的。jar文件,但作为独立的。jar文件:

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

在SDK级别23中使用Apache HTTP:

顶层构建。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/
    }
    ...
}

Android工作室关于gradle更新的通知:

特定于模块的构建。Gradle - /app/build.gradle

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
    ...
    useLibrary 'org.apache.http.legacy'
    ...
}