（快速）AndroidStudio报错ERROR: Cause:

转载请注明出处。

接上篇，如果你需要知道原理，请查看我的这篇文章https://www.jianshu.com/p/89ca5b635d3f，如果你不需要了解那么多，并且只想快速的装好你的AndroidStudio，那就请按着教程愉快的开始吧！

目录

• 1.安装证书
• 2.使用阿里仓库
• 3.刷新缓存使配置生效

1.安装证书

（1）准备安装证书的java代码

注意，该文件与上篇文章的文件内容不一样，所以不要使用上一篇文章InstallCert.java文件来进行下面的操作！！该文件集成了新建项目要用到的域名"dl.google.com", "maven.aliyun.com", "jcenter.bintray.com", "d29vzk4ow07wi7.cloudfront.net"，后续操作会一次性添加这些证书，如果你还有其它的域名，在代码中的hosts加上即可

• 点击下载：InstallCert.java（推荐，如果打开是源码而不是文件，右键浏览器另存为，保存名为InstallCert.java即可）
• 也可以新建一个InstallCert.java文件，然后复制以下代码。

/*
 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import java.io.*;
import java.security.*;
import java.security.cert.*;
import java.util.Scanner;
import javax.net.ssl.*;

public class InstallCert {
    public static int certCount = 0;
    public static StringBuilder stringBuilder = new StringBuilder();
    public static void main(String[] args) {
        //if you hava other host, you can add host to it
        String[] hosts = new String[]{"dl.google.com", "maven.aliyun.com", "jcenter.bintray.com", "d29vzk4ow07wi7.cloudfront.net"};
        for (String host : hosts) {
            addCert(host);
        }

        System.out.println("Success Add Cert Count:"+certCount);
        System.out.println("Add Error:"+stringBuilder.toString());
    }

    public static void addCert(String host) {
        try {
            int port = 443; //Server Port
            String p = "changeit"; //default is changeit
            char[] passphrase = p.toCharArray();
            String tfilePath = new File(new File("").getAbsolutePath()).getParentFile().getAbsolutePath();
            System.out.println(new File("").getAbsolutePath());
            File file = new File(tfilePath + "/jre/lib/security/cacerts");
            System.out.println("Loading KeyStore " + file.getAbsolutePath() + "...");
            InputStream in = new FileInputStream(file);
            KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
            ks.load(in, passphrase);
            in.close();

            SSLContext context = SSLContext.getInstance("TLS");
            TrustManagerFactory tmf =
                    TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            tmf.init(ks);
            X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
            SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
            context.init(null, new TrustManager[]{tm}, null);
            SSLSocketFactory factory = context.getSocketFactory();

            System.out.println("Opening connection to " + host + ":" + port + "...");
            SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
            socket.setSoTimeout(10000);
            try {
                System.out.println("Starting SSL handshake...");
                socket.startHandshake();
                socket.close();
                System.out.println();
                System.out.println("No errors, certificate is already trusted");
            } catch (SSLException e) {
                System.out.println();
                e.printStackTrace(System.out);
            }

            X509Certificate[] chain = tm.chain;
            if (chain == null) {
                System.out.println("Could not obtain server certificate chain");
                return;
            }

            BufferedReader reader =
                    new BufferedReader(new InputStreamReader(System.in));

            System.out.println();
            System.out.println("Server sent " + chain.length + " certificate(s):");
            System.out.println();
            MessageDigest sha1 = MessageDigest.getInstance("SHA1");
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            for (int i = 0; i < chain.length; i++) {
                X509Certificate cert = chain[i];
                System.out.println
                        (" " + (i + 1) + " Subject " + cert.getSubjectDN());
                System.out.println("   Issuer  " + cert.getIssuerDN());
                sha1.update(cert.getEncoded());
                System.out.println("   sha1    " + toHexString(sha1.digest()));
                md5.update(cert.getEncoded());
                System.out.println("   md5     " + toHexString(md5.digest()));
                System.out.println();
            }

            //jump user input
            System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
            int k = 0;
            X509Certificate cert = chain[k];
            String alias = host + "-" + (k + 1);
            ks.setCertificateEntry(alias, cert);
            OutputStream out = new FileOutputStream(file);
            ks.store(out, passphrase);
            out.close();

            System.out.println();
            System.out.println(cert);
            System.out.println();
            System.out.println
                    ("Added certificate to keystore 'jssecacerts' using alias '"
                            + alias + "'");
            certCount++;
        } catch (Exception e) {
            e.printStackTrace();
            stringBuilder.append(host+"=======");
        }
    }

    private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

    private static String toHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 3);
        for (int b : bytes) {
            b &= 0xff;
            sb.append(HEXDIGITS[b >> 4]);
            sb.append(HEXDIGITS[b & 15]);
            sb.append(' ');
        }
        return sb.toString();
    }

    private static class SavingTrustManager implements X509TrustManager {

        private final X509TrustManager tm;
        private X509Certificate[] chain;

        SavingTrustManager(X509TrustManager tm) {
            this.tm = tm;
        }

        public X509Certificate[] getAcceptedIssuers() {
            throw new UnsupportedOperationException();
        }

        public void checkClientTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            throw new UnsupportedOperationException();
        }

        public void checkServerTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            this.chain = chain;
            tm.checkServerTrusted(chain, authType);
        }
    }
}

（2）将证书文件放到AndroidStudio的java目录里
把InstallCert.java移动到 “AndroidStudio安装目录/jre/bin”目录下，注意！不是jre/jre/bin目录下，不要弄错了，如下图所示

1.jpg

（3）导入证书

• 以管理员身份打开cmd进入到该目录，您也可以在地址栏直接输入cmd可快速进入该目录，如图所示

  
  3.png
  4.png
• 在cmd输入javac InstallCert.java然后回车编译代码， 随后输入java InstallCert运行程序，等待程序结束运行即可！

C:\FastSoftwore\AndroidStudio\jre\bin>javac InstallCert.java

C:\FastSoftwore\AndroidStudio\jre\bin>java InstallCert

• 当cmd窗口最后出现Add Error为空表示所有证书导入完成

  
  5.png

2.使用阿里仓库

（1）加入阿里仓库地址

这个步骤可以加快你项目构建的速度，为了节省您的时间，推荐你将阿里仓库加入到你的项目中

• 打开Project级别的build.gradle文件，google()之上加入以下代码，建议加在最上面，以便优先使用该地址（如图所示，有两处地方需要加上）

        //阿里仓库服务，加快依赖下载速度
        maven{ url 'https://maven.aliyun.com/repository/google/'}
        maven{ url 'https://maven.aliyun.com/repository/jcenter/'}

6.png

3.刷新缓存使配置生效

• ** 点击File->Invalidate Caches / Restart ** 刷新缓存并重启

  
  7.png

• ** 在弹出的窗口中选择Invalidate and Restart 确认刷新缓存并重启 **

  
  8.png
  

  -- ** 当AndroidStudio自动重启后，发现运行按钮是灰色的，并且右下角也没有Gradle进程在运行，可以尝试点击File->Sync Project with Gradle Files来同步项目

  
  9.png

到这一步，问题基本已经解决，如果问题没解决，你应该检查你是否改过AndroidStudio使用的java环境，基本上AndroidStudio默认使用自带的java环境，除非你手动设置过，如果确实没动过，可尝试多同步一下项目看看（File->Sync Project with Gradle Files），因为有时候网络不好，导致下载失败，也会引起这个问题】（完）

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