Android实现版本更新

Android 实现从后台下载apk文件，保存到本地sd卡，使用系统安装apk，完成版本更新功能

LoadAppUtil.java

 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.List;
 
 /**
  * Depiction:
  * Author: kuzan
  * Date: 2017/01/14 9:42
  */
 public class LoadAppUtil {
 
     private static List<String> list = new ArrayList<>();
     private static final int TIMEOUT = 10 * 60 * 1000; // 超时
 
     public static final int LOAD_PROCESS = 1;
     public static final int LOAD_SUCCEED = 2;
     public static final int LOAD_ERROR = 3;
 
     /**
      * 下载apk
      * @param context
      * @param packageName 保存apk的名称
      * @param url apk后台下载的地址
      */
     public static void loadApp(Context context, final String packageName, final String url) {
 
         final String path = getLoadAppPath(context, packageName);
 
         if (StringUtils.isEmptyString(path) || StringUtils.isEmptyString(url)) {
             loadError(packageName);
             return;
         }
 
         // 判断是否在下载
         if (list.contains(packageName)) {
             return;
         }
 
         list.add(packageName);
 
         new Thread(new Runnable() {
             @Override
             public void run() {
                 downloadUpdateFile(packageName, url, path);
             }
         }).start();
     }
 
     /**
      * 文件下载
      * @param packageName 保存apk的名称
      * @param down_url apk后台下载的地址
      * @param file 保存apk的文件路径
      * */
     public static void downloadUpdateFile(String packageName, String down_url, String file) {
 
         int totalSize = 0; // 文件总大小
         InputStream in = null;
         FileOutputStream fos = null;
 
         FileUtils.deleteFile(file);
         FileUtils.createFile(file);
 
         URL url;
         try {
             url = new URL(down_url);
 
             HttpURLConnection httpURLConnection = (HttpURLConnection) url
                     .openConnection();
 
             httpURLConnection.setConnectTimeout(TIMEOUT);
 
             httpURLConnection.setReadTimeout(TIMEOUT);
 
             // 获取下载文件的size
             totalSize = httpURLConnection.getContentLength();
             Log.e("LoadAppUtil", "totalSize = " + totalSize);
 
             if (httpURLConnection.getResponseCode() == 404) {
                 loadError(packageName);
                 return;
             }
 
             in = httpURLConnection.getInputStream();
             fos = new FileOutputStream(file, false);
         } catch (IOException e) {
             e.printStackTrace();
             loadError(packageName);
             return;
         }
 
         int downloadCount = 0; // 已下载大小
         int updateProgress = 0; // 更新进度
 
         byte buffer[] = new byte[64];
         int readsize = 0;
 
         try {
             LoadBean bean = new LoadBean(packageName,file,0);
             post(LOAD_PROCESS,bean);
             while ((readsize = in.read(buffer)) != -1) {
 
                 fos.write(buffer, 0, readsize);
 
                 // 计算已下载到的大小
                 downloadCount += readsize;
 
                 // 先计算已下载的百分比，然后跟上次比较是否有增加，有则更新通知进度
                 int now = downloadCount * 100 / totalSize;
                 // Log.e(TAG, "now = " + now) ;
                 if (updateProgress < now) {
                     updateProgress = now;
                     // 发送下载进度
                     bean.setProcess(now);
                     post(LOAD_PROCESS,bean);
                 }
             }
         } catch (Exception e) {
             e.printStackTrace();
             loadError(packageName);
             return;
         } finally {
             try {
                 fos.close();
                 in.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
 
         // 发送下载完成消息
         if(list.contains(packageName)){
             list.remove(packageName);
             LoadBean bean = new LoadBean(packageName,file,100);
             post(LOAD_SUCCEED,bean);
         }
 
     }
 
     private static void loadError(String packageName) {
         if (list.contains(packageName)) {
             list.remove(packageName);
         }
         // 发送下载错误消息
         LoadBean bean = new LoadBean(packageName,"",0);
         post(LOAD_ERROR,bean);
     }
 
     /**
      * 获取保存apk的文件路径
      *
      * @param context
      * @return
      */
     public static String getLoadAppPath(Context context, String packageName) {
         if (FileUtils.isSdCardExist()) {
             return context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath() + File.separator + packageName + ".apk";
         }
         return "";
     }
 
     /**
      * 判断文件是否存在
      * @param path 文件路径
      * @return
      */
     public static boolean isFileExists(String path) {
         if (TextUtils.isEmpty(path)) {
             return false;
         }
         try {
             File f=new File(path);
             if(!f.exists()) {
                 return false;
             }
         }
         catch (Exception e) {
             return false;
         }
 
         return true;
     }
 
     /**
      * 通知UI
      * */
     public static void post(int clickId,LoadBean bean){
         RxBus.getDefault().post(RxBusEvent.newBuilder(R.id.load_apk).clickId(clickId).setObj(bean).build());
     }
 }

调用方法：

LoadAppUtil.loadApp(UpdateActivity.this, newVersionName, UrlConstants.UPLOAD_URL);

信息读取：（使用的消息通知是android RxBus）

 mySubscriptions.add(RxBus.getDefault().toObserverable(RxBusEvent.class).subscribe(new Action1<RxBusEvent>() {
             @Override
             public void call(final RxBusEvent rxBusEvent) {
                 if (rxBusEvent.getType() == R.id.load_apk) {
                     switch (rxBusEvent.getClickId()) {
                         case LoadAppUtil.LOAD_SUCCEED:
                             runOnUiThread(new Runnable() {
                                 @Override
                                 public void run() {
                                     // 下载完成
                                     Log.e("LOAD", "LOAD_SUCCEED");
                                     AppUtils.installApp(UpdateActivity.this, (LoadBean) rxBusEvent.getObj().getPath());
                                     isLoadFinish = true;
                                 }
                             });
                             break;
 
                         case LoadAppUtil.LOAD_PROCESS:
                             runOnUiThread(new Runnable() {
                                 @Override
                                 public void run() {
                                     // 下载进度
                                     isLoadFinish = false;
                                     updateProgress((LoadBean) rxBusEvent.getObj());
                                 }
                             });
                             break;
 
                         case LoadAppUtil.LOAD_ERROR:
                             runOnUiThread(new Runnable() {
                                 @Override
                                 public void run() {
                                     // 下载出错
                                     Log.e("upload", "err");
                                     isLoadFinish = false;
                                     ToastUtils.ToastMessage(UpdateActivity.this, "下载失败");
                                 }
                             });
                             break;
                     }
                 }
             }
         }));

LoadBean.java

 public class LoadBean {
 
     private String packageName;
     private String path;
     private int process;
 
     public LoadBean(String packageName, String path, int process) {
         this.packageName = packageName;
         this.path = path;
         this.process = process;
     }
 
     public String getPackageName() {
         return packageName;
     }
 
     public void setPackageName(String packageName) {
         this.packageName = packageName;
     }
 
     public String getPath() {
         return path;
     }
 
     public void setPath(String path) {
         this.path = path;
     }
 
     public int getProcess() {
         return process;
     }
 
     public void setProcess(int process) {
         this.process = process;
     }
 }