Android App自动更新解决方案(DownloadManager)

一开始，我们先向服务器请求数据获取版本

    public ObservableField<VersionBean> appVersion = new ObservableField<>();
 
     /**
      * 获取服务器版本并判断是否需要更新
      */
     public void getServiceAppVersionEvent() {
         resource.getAppVersionEvent()
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(response -> {
                     if (EmptyUtil.isNotEmpty(response.body)) {
                         appVersion.set(response.body);
                         if (UpdateAppUtil.checkAppVersion(response.body)) {
                             checkUpdate.set("发现新版本" + response.body.getVersion());
                         }
                     }
                 });
     }

服务器返回的数据

 /**
  * Created by hyx on 17-9-29.
  */
 
 public class VersionBean {
 
     private String description;
     private String url;
     private String version;
 
     public String getUrl() {
         return url;
     }
 
     public void setUrl(String url) {
         this.url = url;
     }
 
     public String getVersion() {
         return version;
     }
 
     public void setVersion(String version) {
         this.version = version;
     }
 
     public String getDescription() {
         return description;
     }
 
     public void setDescription(String description) {
         this.description = description;
     }
 }

对比服务器和本地判断是否需要更新，我这里是根据VersionName判断

   /**
     * 获取versionName
     *
     * @return
     */
    public static String getAppVersionName() {
        if (EmptyUtil.isNotEmpty(CtrAppImpl.getContext())) {
            try {
                PackageManager manager = CtrAppImpl.getContext().getPackageManager();
                PackageInfo info = manager.getPackageInfo(CtrAppImpl.getContext().getPackageName(), 0);
                return info.versionName;
            } catch (Exception e) {
                e.printStackTrace();
                return "";
            }
 
        } else {
            return null;
        }
    }
 
    /**
     * 获取versionId
     *
     * @return
     */
    public static int getAppVersionCode() {
        if (EmptyUtil.isNotEmpty(CtrAppImpl.getContext())) {
            try {
                PackageManager manager = CtrAppImpl.getContext().getPackageManager();
                PackageInfo info = manager.getPackageInfo(CtrAppImpl.getContext().getPackageName(), 0);
                return info.versionCode;
            } catch (Exception e) {
                e.printStackTrace();
                return -1;
            }
 
        } else {
            return -1;
        }
    }
 
    /**
     * true 表示需要更新，false 表示当前版本是最新的
     *
     * @param versionBean
     * @return
     */
    public static boolean checkAppVersion(VersionBean versionBean) {
        if (EmptyUtil.isNotEmpty(versionBean)) {
            if (!getAppVersionName().equals(versionBean.getVersion())) {
                return true;
            } else {
                return false;
            }
        }
        return false;
    }

如果需要更新，我们根据存储的downloadId去查询下载状态，因为有可能用户之前已经下载了，没有安装，亦或正在下载中，下载暂停等情况，

  if (UpdateAppUtil.checkAppVersion(getViewModel().appVersion.get())) {
                 //根据downloadId查询下载状态
                 long downloadId = (long) SPUtil.get(PersonalActivity.this, "downloadId", -1L);
                 UpdateAppUtil.checkDownloadStatus(downloadId, new DataBack<Integer>() {
                     @Override
                     public void take(Integer status) {
                         if (status == -1) {
                             new MaterialDialog.Builder(PersonalActivity.this)
                                     .title("版本更新")
                                     .content("发现新版本，是否更新？")
                                     .positiveText("确定")
                                     .negativeText("取消")
                                     .onPositive(((materialDialog, dialogAction) -> {
                                         ToastUtil.showShortToast("正在后台为您下载");
                                         UpdateAppUtil.downloadAPK(getViewModel().appVersion.get(), "ctrshoppix.apk");
                                     }))
                                     .onNegative((materialDialog, dialogAction) -> {
                                         materialDialog.dismiss();
                                     })
                                     .show();
                         } else if (status == DownloadManager.STATUS_FAILED) {
                             ToastUtil.showShortToast("下载失败,正在为您重新下载");
                             UpdateAppUtil.downloadAPK(getViewModel().appVersion.get(), "ctrshoppix.apk");
                         } else if (status == DownloadManager.STATUS_SUCCESSFUL) {
                             if (UpdateAppUtil.compareApk(UpdateAppUtil.getApkInfo(UpdateAppUtil.getDownloadPath(downloadId)))) {
                                 UpdateAppUtil.installApp(UpdateAppUtil.getDownloadUri(downloadId));
                             } else {
                                 UpdateAppUtil.removeDownloadId(downloadId);
                             }
                         }
                     }
                 });

具体的方法在下面UpdateAppUtil中查看，备注写的很清楚

 import android.app.Activity;
 import android.app.DownloadManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Environment;
 import android.support.v4.content.FileProvider;
 import android.text.BoringLayout;
 
 import java.io.File;
 import java.io.IOException;
 
 import ppm.ctr.cctv.ctr.application.CtrAppImpl;
 import ppm.ctr.cctv.ctr.common.AsyncCall;
 import ppm.ctr.cctv.ctr.common.DataBack;
 import ppm.ctr.cctv.ctr.network.entity.VersionBean;
 import ppm.ctr.cctv.ctr.services.file.UriPraseUtil;
 
 /**
  * Created by css on 2017/10/30.
  */
 
 public class UpdateAppUtil {
     private static DownloadManager downloadManager;
 
     /**
      * 获取versionName
      *
      * @return
      */
     public static String getAppVersionName() {
         if (EmptyUtil.isNotEmpty(CtrAppImpl.getContext())) {
             try {
                 PackageManager manager = CtrAppImpl.getContext().getPackageManager();
                 PackageInfo info = manager.getPackageInfo(CtrAppImpl.getContext().getPackageName(), 0);
                 return info.versionName;
             } catch (Exception e) {
                 e.printStackTrace();
                 return "";
             }
 
         } else {
             return null;
         }
     }
 
     /**
      * 获取versionId
      *
      * @return
      */
     public static int getAppVersionCode() {
         if (EmptyUtil.isNotEmpty(CtrAppImpl.getContext())) {
             try {
                 PackageManager manager = CtrAppImpl.getContext().getPackageManager();
                 PackageInfo info = manager.getPackageInfo(CtrAppImpl.getContext().getPackageName(), 0);
                 return info.versionCode;
             } catch (Exception e) {
                 e.printStackTrace();
                 return -1;
             }
 
         } else {
             return -1;
         }
     }
 
     /**
      * true 表示需要更新，false 表示当前版本是最新的
      *
      * @param versionBean
      * @return
      */
     public static boolean checkAppVersion(VersionBean versionBean) {
         if (EmptyUtil.isNotEmpty(versionBean)) {
             if (!getAppVersionName().equals(versionBean.getVersion())) {
                 return true;
             } else {
                 return false;
             }
         }
         return false;
     }
 
     /**
      * 检查下载状态
      *
      * @param downloadId
      * @param dataBack
      */
     public static void checkDownloadStatus(long downloadId, DataBack<Integer> dataBack) {
         DownloadManager.Query query = new DownloadManager.Query();
         //通过下载的id查找
         query.setFilterById(downloadId);
         //获取DownloadManager
         if (EmptyUtil.isEmpty(downloadManager)) {
             downloadManager = (DownloadManager) CtrAppImpl.getContext().getSystemService(Context.DOWNLOAD_SERVICE);
         }
         Cursor c = downloadManager.query(query);
         if (c.moveToFirst()) {
             int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
             switch (status) {
                 case -1:
                     dataBack.take(-1);
                     break;
                 //下载暂停
                 case DownloadManager.STATUS_PAUSED:
                     ToastUtil.showShortToast("下载暂停");
                     break;
                 //下载延迟
                 case DownloadManager.STATUS_PENDING:
                     ToastUtil.showShortToast("下载延迟");
                     break;
                 //正在下载
                 case DownloadManager.STATUS_RUNNING:
                     ToastUtil.showShortToast("正在下载");
                     break;
                 //下载完成
                 case DownloadManager.STATUS_SUCCESSFUL:
                     dataBack.take(DownloadManager.STATUS_SUCCESSFUL);
 
                     break;
                 //下载失败
                 case DownloadManager.STATUS_FAILED:
                     dataBack.take(DownloadManager.STATUS_FAILED);
                     break;
                 default:
                     dataBack.take(-1);
                     break;
             }
 
             dataBack.take(status);
         } else {
             //可能用户误删之前已经下载得apk
             dataBack.take(-1);
         }
         c.close();
     }
 
     /**
      * 根据downloadID获取本地存储的文件path
      *
      * @param downloadId
      * @return
      */
     public static String getDownloadPath(long downloadId) {
         //获取DownloadManager
         if (EmptyUtil.isEmpty(downloadManager)) {
             downloadManager = (DownloadManager) CtrAppImpl.getContext().getSystemService(Context.DOWNLOAD_SERVICE);
         }
         String downloadPath = new File(UriPraseUtil.uriToFile(downloadManager.getUriForDownloadedFile(downloadId), CtrAppImpl.getContext())).toString();
         return downloadPath;
     }
 
     /**
      * 根据downloadID 获取获取本地文件存储的uri
      *
      * @param downloadId
      * @return
      */
     public static Uri getDownloadUri(long downloadId) {
         //获取DownloadManager
         if (EmptyUtil.isEmpty(downloadManager)) {
             downloadManager = (DownloadManager) CtrAppImpl.getContext().getSystemService(Context.DOWNLOAD_SERVICE);
         }
         Uri downloadFileUri = downloadManager.getUriForDownloadedFile(downloadId);
         //适配不同的手机，有的手机不能识别，所以再转一遍
         Uri uri = Uri.fromFile(new File(UriPraseUtil.uriToFile(downloadFileUri, CtrAppImpl.getContext())));
         return uri;
     }
 
     /**
      * 获取apk程序信息
      *
      * @param path apk path
      */
     public static PackageInfo getApkInfo(String path) {
         PackageManager pm = CtrAppImpl.getContext().getPackageManager();
         PackageInfo info = pm.getPackageArchiveInfo(path, PackageManager.GET_ACTIVITIES);
         if (info != null) {
             return info;
         }
         return null;
     }
 
     /**
      * 下载的apk和当前程序版本比较
      *
      * @param apkInfo apk file's packageInfo
      * @return 如果当前应用版本小于apk的版本则返回true
      */
     public static boolean compareApk(PackageInfo apkInfo) {
         if (apkInfo == null) {
             return false;
         }
         if (!apkInfo.versionName.equals(getAppVersionName())) {
             return true;
         }
         return false;
 
     }
 
     /**
      * 下载apk
      *
      * @param versionBean
      * @param apkName
      */
     public static void downloadAPK(VersionBean versionBean, String apkName) {
         //创建下载任务
         DownloadManager.Request request = new DownloadManager.Request(Uri.parse(versionBean.getUrl()));
         //移动网络情况下是否允许漫游
         request.setAllowedOverRoaming(false);
 //        设置在通知栏是否显示下载通知(下载进度), 有 3 个值可选:
 //        VISIBILITY_VISIBLE:                   下载过程中可见, 下载完后自动消失 (默认)
 //        VISIBILITY_VISIBLE_NOTIFY_COMPLETED:  下载过程中和下载完成后均可见
 //        VISIBILITY_HIDDEN:                    始终不显示通知
         request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
         request.setTitle("单单拍");
         request.setDescription("");
         request.setVisibleInDownloadsUi(true);
 
         //设置下载的路径
         request.setDestinationInExternalPublicDir(Environment.getExternalStorageDirectory().getAbsolutePath(), apkName);
 
         //获取DownloadManager
         if (EmptyUtil.isEmpty(downloadManager)) {
             downloadManager = (DownloadManager) CtrAppImpl.getContext().getSystemService(Context.DOWNLOAD_SERVICE);
         }
         //将下载请求加入下载队列，加入下载队列后会给该任务返回一个long型的id，通过该id可以取消任务，重启任务、获取下载的文件等等
         long downloadId = downloadManager.enqueue(request);
         SPUtil.put(CtrAppImpl.getContext(), "downloadId", downloadId);
     }
 
     /**
      * 移除本地存储的downloadid 和相关文件
      *
      * @param downloadId
      */
     public static void removeDownloadId(long downloadId) {
         //获取DownloadManager
         if (EmptyUtil.isEmpty(downloadManager)) {
             downloadManager = (DownloadManager) CtrAppImpl.getContext().getSystemService(Context.DOWNLOAD_SERVICE);
         }
         downloadManager.remove(downloadId);
         SPUtil.remove(CtrAppImpl.getContext(), "downloadId");
     }
 
     /**
      * 安装app
      *
      * @param uri
      */
     public static void installApp(Uri uri) {
         Intent intent = new Intent();
         intent.setDataAndType(uri, "application/vnd.android.package-archive");
         intent.setAction(Intent.ACTION_VIEW);
         intent.addCategory(Intent.CATEGORY_DEFAULT);
         intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
         CtrAppImpl.getContext().startActivity(intent);
     }
 
     /**
      * 安装app
      *
      * @param apkPath
      */
     public static void installApp(String apkPath) {
         File file = new File(apkPath);
         Uri uri = null;
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
             String command = "chmod " + "777" + " " + file;
             Runtime runtime = Runtime.getRuntime();
             try {
                 runtime.exec(command);
             } catch (IOException e) {
                 e.printStackTrace();
             }
             uri = FileProvider.getUriForFile(CtrAppImpl.getContext(), "ppm.ctr.cctv.ctr.provider", file);
         } else {
             uri = Uri.fromFile(file);
         }
         Intent intent = new Intent();
         intent.setDataAndType(uri, "application/vnd.android.package-archive");
         intent.setAction(Intent.ACTION_VIEW);
         intent.addCategory(Intent.CATEGORY_DEFAULT);
         intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
         CtrAppImpl.getContext().startActivity(intent);
     }
 
 }