Android Studio 插件开发详解二：工具类

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本文出自【赵彦军的博客】

在插件开发过程中，我们按照开发一个正式的项目来操作，需要整理一些常用工具类。

Http 请求封装

在插件的项目中，我们看到依赖库如下图所示：

• 在依赖包中，我们可以看到插件中是用了 httpClient 作为 http 底层连接库，做过 Android 开发的同学对 httpClient 库应该很熟悉，在早期的Android开发中，我们都用 httpClient 做 http 请求，后来被Android 废弃了。

• 另外，在这里的 Json 解析用的 Gson , 是谷歌官方出品的 Json 解析框架。

下面我们总结一个 HttpManager 以满足日常的插件开发需求，HttpManager 目前满足的功能有

• Get 请求

HttpManager.getInstance().get(String url) ;HttpManager.getInstance().get(String url, Map<String, String> params) ;

• Post 请求

HttpManager.getInstance().post(String url, Map<String, String> requestParams) ;

• 下载文件

HttpManager.getInstance().downloadFile(String url, String destFileName);

如果我们需要其他的网络服务，可以自行搜索 Httpclient 的其他功能。

HttpManager 源码如下所示：

package com.http;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;import java.io.*;import java.net.URI;import java.net.URLEncoder;import java.util.*;public class HttpManager {    private static HttpManager ourInstance = new HttpManager();    public static HttpManager getInstance() {        return ourInstance;    }    private HttpManager() {    }    /**     * POST请求     *     * @param url     * @param requestParams     * @return     * @throws Exception     */    public String post(String url, Map<String, String> requestParams) throws Exception {        String result = null;        CloseableHttpClient httpClient = HttpClients.createDefault();        /**HttpPost*/        HttpPost httpPost = new HttpPost(url);        List params = new ArrayList();        Iterator<Map.Entry<String, String>> it = requestParams.entrySet().iterator();        while (it.hasNext()) {            Map.Entry<String, String> en = it.next();            String key = en.getKey();            String value = en.getValue();            if (value != null) {                params.add(new BasicNameValuePair(key, value));            }        }        httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));        /**HttpResponse*/        CloseableHttpResponse httpResponse = httpClient.execute(httpPost);        try {            HttpEntity httpEntity = httpResponse.getEntity();            result = EntityUtils.toString(httpEntity, "utf-8");            EntityUtils.consume(httpEntity);        } finally {            try {                if (httpResponse != null) {                    httpResponse.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }        return result;    }    /**     * GET 请求     *     * @param url     * @param params     * @return     */    public String get(String url, Map<String, String> params) {        return get(getUrlWithQueryString(url, params));    }    /**     * Get 请求     *     * @param url     * @return     */    public String get(String url) {        CloseableHttpClient httpCient = HttpClients.createDefault();        HttpGet httpGet = new HttpGet();        httpGet.setURI(URI.create(url));        String result = null;        //第三步：执行请求，获取服务器发还的相应对象        CloseableHttpResponse httpResponse = null;        try {            httpResponse = httpCient.execute(httpGet);            if (httpResponse.getStatusLine().getStatusCode() == 200) {                HttpEntity entity = httpResponse.getEntity();                String response = EntityUtils.toString(entity, "utf-8");//将entity当中的数据转换为字符串                result = response.toString();            }        } catch (IOException e) {            e.printStackTrace();        } finally {            if (httpResponse != null) {                try {                    httpResponse.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }        return result;    }    /**     * 根据api地址和参数生成请求URL     *     * @param url     * @param params     * @return     */    private String getUrlWithQueryString(String url, Map<String, String> params) {        if (params == null) {            return url;        }        StringBuilder builder = new StringBuilder(url);        if (url.contains("?")) {            builder.append("&");        } else {            builder.append("?");        }        int i = 0;        for (String key : params.keySet()) {            String value = params.get(key);            if (value == null) { //过滤空的key                continue;            }            if (i != 0) {                builder.append('&');            }            builder.append(key);            builder.append('=');            builder.append(encode(value));            i++;        }        return builder.toString();    }    /**     * 下载文件     *     * @param url     * @param destFileName     * @throws ClientProtocolException     * @throws IOException     */    public boolean downloadFile(String url, String destFileName) {        CloseableHttpClient httpclient = HttpClients.createDefault();        HttpGet httpget = new HttpGet(url);        HttpResponse response = null;        InputStream in = null;        try {            response = httpclient.execute(httpget);            HttpEntity entity = response.getEntity();            in = entity.getContent();            File file = new File(destFileName);            FileOutputStream fout = new FileOutputStream(file);            int l = -1;            byte[] tmp = new byte[1024];            while ((l = in.read(tmp)) != -1) {                fout.write(tmp, 0, l);            }            fout.flush();            fout.close();            return true;        } catch (IOException e) {            e.printStackTrace();        } finally {            // 关闭低层流。            if (in != null) {                try {                    in.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            try {                httpclient.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return false;    }    /**     * 进行URL编码     *     * @param input     * @return     */    private String encode(String input) {        if (input == null) {            return "";        }        try {            return URLEncoder.encode(input, "utf-8");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return input;    }}

Json 解析封装

根据 Gson 库进行封装，具体用法如下：

• json字符串转对象

  JsonUtil.fromJson(String json, Class<T> classOfT)

• 对象转json字符串

 JsonUtil.toJson(Object src);

JsonUtil 源码如下：

package com.util;import com.google.gson.Gson;public class JsonUtil {    static Gson gson = new Gson() ;    /**     * json字符串转对象     * @param json     * @param classOfT     * @param <T>     * @return     */    public static <T>T fromJson(String json, Class<T> classOfT){        return gson.fromJson(json,classOfT);    }    /**     * 对象转json字符串     * @param src     * @return     */    public static String toJson(Object src){       return gson.toJson(src);    }}

Log 日志

Logger 类源码

package com.util;import com.intellij.notification.*;/** * logger * Created by zhaoyanjun on 15/11/27. */public class Logger {    private static String NAME;    private static int LEVEL = 0;    public static final int DEBUG = 3;    public static final int INFO = 2;    public static final int WARN = 1;    public static final int ERROR = 0;    public static void init(String name,int level) {        NAME = name;        LEVEL = level;        NotificationsConfiguration.getNotificationsConfiguration().register(NAME, NotificationDisplayType.NONE);    }    public static void debug(String text) {        if (LEVEL >= DEBUG) {            Notifications.Bus.notify(                    new Notification(NAME, NAME + " [DEBUG]", text, NotificationType.INFORMATION));        }    }    public static void info(String text) {        if (LEVEL > INFO) {            Notifications.Bus.notify(                    new Notification(NAME, NAME + " [INFO]", text, NotificationType.INFORMATION));        }    }    public static void warn(String text) {        if (LEVEL > WARN) {            Notifications.Bus.notify(                    new Notification(NAME, NAME + " [WARN]", text, NotificationType.WARNING));        }    }    public static void error(String text) {        if (LEVEL > ERROR) {            Notifications.Bus.notify(                    new Notification(NAME, NAME + " [ERROR]", text, NotificationType.ERROR));        }    }}

使用

//初始化Logger.init("zhao" , Logger.DEBUG);//打印 debug 信息Logger.debug("i am a debug");//打印info信息Logger.info("i am a info");//打印warn信息Logger.warn("i am a warn");//打印error信息Logger.error("i am a error");

在 Android Studio 里效果如下

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