Android Studio 外掛開發詳解二：工具類
阿新 • • 發佈：2018-12-31
轉載請標明出處：http://blog.csdn.net/zhaoyanjun6/article/details/78112856
本文出自【趙彥軍的部落格】
在外掛開發過程中，我們按照開發一個正式的專案來操作，需要整理一些常用工具類。
Http 請求封裝
在外掛的專案中，我們看到依賴庫如下圖所示：
在依賴包中，我們可以看到外掛中是用了 httpClient 作為 http 底層連線庫，做過 Android 開發的同學對 httpClient 庫應該很熟悉，在早期的Android開發中，我們都用 httpClient 做 http 請求，後來被Android 廢棄了。
另外，在這裡的 Json 解析用的 Gson , 是谷歌官方出品的 Json 解析框架。
下面我們總結一個 HttpManager 以滿足日常的外掛開發需求，HttpManager 目前滿足的功能有
- Get 請求
HttpManager.getInstance().get(String url) ;
HttpManager.getInstance().get(String url, Map<String, String> params) ;
- Post 請求
HttpManager.getInstance().post(String url, Map<String, String> requestParams) ;- 下載檔案
HttpManager.getInstance().downloadFile(String url, String destFileName);如果我們需要其他的網路服務，可以自行搜尋 Httpclient 的其他功能。
HttpManager 原始碼如下所示：
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請求 * * @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 請求 * * @param url * @param params * @return */ public String get(String url, Map<String, String> params) { return get(getUrlWithQueryString(url, params)); } /** * Get 請求 * * @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：執行請求，獲取伺服器發還的相應物件 CloseableHttpResponse httpResponse = null; try { httpResponse = httpCient.execute(httpGet); if (httpResponse.getStatusLine().getStatusCode() == 200) { HttpEntity entity = httpResponse.getEntity(); String response = EntityUtils.toString(entity, "utf-8");//將entity當中的資料轉換為字串 result = response.toString(); } } catch (IOException e) { e.printStackTrace(); } finally { if (httpResponse != null) { try { httpResponse.close(); } catch (IOException e) { e.printStackTrace(); } } } return result; } /** * 根據api地址和引數生成請求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) { //過濾空的key continue; } if (i != 0) { builder.append('&'); } builder.append(key); builder.append('='); builder.append(encode(value)); i++; } return builder.toString(); } /** * 下載檔案 * * @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 { // 關閉低層流。 if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return false; } /** * 進行URL編碼 * * @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 解析封裝
根據 Gson 庫進行封裝，具體用法如下：
- json字串轉物件
JsonUtil.fromJson(String json, Class<T> classOfT)- 物件轉json字串
JsonUtil.toJson(Object src);
JsonUtil 原始碼如下：
package com.util;
import com.google.gson.Gson;
public class JsonUtil {
static Gson gson = new Gson() ;
/**
* json字串轉物件
* @param json
* @param classOfT
* @param <T>
* @return
*/
public static <T>T fromJson(String json, Class<T> classOfT){
return gson.fromJson(json,classOfT);
}
/**
* 物件轉json字串
* @param src
* @return
*/
public static String toJson(Object src){
return gson.toJson(src);
}
}
Log 日誌
Logger 類原始碼
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);
//列印 debug 資訊
Logger.debug("i am a debug");
//列印info資訊
Logger.info("i am a info");
//列印warn資訊
Logger.warn("i am a warn");
//列印error資訊
Logger.error("i am a error");在 Android Studio 裡效果如下
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