Android实现APP在线下载更新

前言

项目地址：UpdateAppDemo

现在的android应用app会隔一段时间发布一个新的版本，当你打开某个app，如果有最新的版本，会提醒你是否下载更新。本文利用android自带的下载管理器DownloadManager进行下载最新版本的apk，下载完成后自动跳转安装。效果如下：

第一步、检查版本并判断是否需要更新

通过获取当前app版本号与服务器上的版本号进行对比，如果本地的版本号低于服务器版本号，则弹出提示框：发现新版本，是否下载更新。

/**
 * Created by Teprinciple on 2016/11/15.
 */
public class UpdateAppUtil {

  /**
   * 获取当前apk的版本号 currentVersionCode
   * @param ctx
   * @return
   */
  public static int getAPPLocalVersion(Context ctx) {
    int currentVersionCode = 0;
    PackageManager manager = ctx.getPackageManager();
    try {
      PackageInfo info = manager.getPackageInfo(ctx.getPackageName(), 0);
      String appVersionName = info.versionName; // 版本名
      currentVersionCode = info.versionCode; // 版本号
    } catch (PackageManager.NameNotFoundException e) {
      e.printStackTrace();
    }
    return currentVersionCode;
  }

  /**
   * 获取服务器上版本信息
   * @param context
   * @param callBack
   */
  public static void getAPPServerVersion(Context context, final VersionCallBack callBack){

    HttpUtil.getObject(Api.GETVERSION.mapClear().addBody(), VersionInfo.class, new HttpUtil.ObjectCallback() {
      @Override
      public void result(boolean b, @Nullable Object obj) {
        if (b){
            callBack.callBack((VersionInfo) obj);
        }
      }
    });
  }

  /**
   * 判断版本号，更新APP
   * @param context
   */
  public static void updateApp(final Context context){
    getAPPServerVersion(context, new VersionCallBack() {
      @Override
      public void callBack(final VersionInfo info) {
        if (info != null && info.getVersionCode()!=null){

          Log.i("this","版本信息：当前"+getAPPLocalVersion(context)+",服务器："+Integer.valueOf(info.getVersionCode()));

          if (Integer.valueOf(info.getVersionCode()) > getAPPLocalVersion(context)){
            ConfirmDialog dialog = new ConfirmDialog(context, new lht.wangtong.gowin120.doctor.views.feature.Callback() {
              @Override
              public void callback() {
                DownloadAppUtils.downloadForAutoInstall(context, Api.HOST_IMG+info.getLoadPath(), "demo.apk", "更新demo");
              }
            });
            dialog .setContent("发现新版本:"+info.getVersionNumber()+"\n是否下载更新?");
            dialog.setCancelable(false);
            dialog .show();
          }
        }
      }
    });
  }

  public interface VersionCallBack{
    void callBack(VersionInfo info);
  }

}

第二步、下载最新版apk

通过Android自带的DownloadManager下载管理器，下载服务器上最新版的apk。下载完成后会发送下载完成的广播。

/**
 * Created by Teprinciple on 2016/11/15.
 */
public class DownloadAppUtils {
  private static final String TAG = DownloadAppUtils.class.getSimpleName();
  public static long downloadUpdateApkId = -1;//下载更新Apk 下载任务对应的Id
  public static String downloadUpdateApkFilePath;//下载更新Apk 文件路径

  /**
   * 通过浏览器下载APK包
   * @param context
   * @param url
   */
  public static void downloadForWebView(Context context, String url) {
    Uri uri = Uri.parse(url);
    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.setDataAndType(Uri.fromFile(new File(Environment
            .getExternalStorageDirectory(), "tmp.apk")),
        "application/vnd.android.package-archive");
    context.startActivity(intent);
  }

  /**
   * 下载更新apk包
   * 权限:1,<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
   * @param context
   * @param url
   */
  public static void downloadForAutoInstall(Context context, String url, String fileName, String title) {
    //LogUtil.e("App 下载 url="+url+",fileName="+fileName+",title="+title);
    if (TextUtils.isEmpty(url)) {
      return;
    }
    try {
      Uri uri = Uri.parse(url);
      DownloadManager downloadManager = (DownloadManager) context
          .getSystemService(Context.DOWNLOAD_SERVICE);
      DownloadManager.Request request = new DownloadManager.Request(uri);
      //在通知栏中显示
      request.setVisibleInDownloadsUi(true);
      request.setTitle(title);
      String filePath = null;
      if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {//外部存储卡
        filePath = Environment.getExternalStorageDirectory().getAbsolutePath();

      } else {
        T.showShort(context, R.string.download_sdcard_error);
        return;
      }
      downloadUpdateApkFilePath = filePath + File.separator + fileName;
      // 若存在，则删除
      deleteFile(downloadUpdateApkFilePath);
      Uri fileUri = Uri.parse("file://" + downloadUpdateApkFilePath);
      request.setDestinationUri(fileUri);
      downloadUpdateApkId = downloadManager.enqueue(request);
    } catch (Exception e) {
      e.printStackTrace();
      downloadForWebView(context, url);
    }
  }

  private static boolean deleteFile(String fileStr) {
    File file = new File(fileStr);
    return file.delete();
  }
}

注意添加权限：

<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />

第三步、下载完成后跳转安装

通过广播接收者，接收到下载完成后发出的广播，跳转到系统的安装界面，进行安装。

/**
 * Created by Teprinciple on 2016/11/15.
 */
public class UpdateAppReceiver extends BroadcastReceiver {
  public UpdateAppReceiver() {
  }

  @Override
  public void onReceive(Context context, Intent intent) {
    // 处理下载完成
    Cursor c=null;
    try {
      if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(intent.getAction())) {
        if (DownloadAppUtils.downloadUpdateApkId >= 0) {
          long downloadId = DownloadAppUtils.downloadUpdateApkId;
          DownloadManager.Query query = new DownloadManager.Query();
          query.setFilterById(downloadId);
          DownloadManager downloadManager = (DownloadManager) context
              .getSystemService(Context.DOWNLOAD_SERVICE);
          c = downloadManager.query(query);
          if (c.moveToFirst()) {
            int status = c.getInt(c
                .getColumnIndex(DownloadManager.COLUMN_STATUS));
            if (status == DownloadManager.STATUS_FAILED) {
              downloadManager.remove(downloadId);

            } else if (status == DownloadManager.STATUS_SUCCESSFUL) {
              if (DownloadAppUtils.downloadUpdateApkFilePath != null) {
                Intent i = new Intent(Intent.ACTION_VIEW);
                i.setDataAndType(
                    Uri.parse("file://"
                        + DownloadAppUtils.downloadUpdateApkFilePath),
                    "application/vnd.android.package-archive");
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(i);
              }
            }
          }
        }
      }/* else if (DownloadManager.ACTION_NOTIFICATION_CLICKED.equals(intent.getAction())) {//点击通知取消下载
        DownloadManager downloadManager = (DownloadManager) context
            .getSystemService(Context.DOWNLOAD_SERVICE);
        long[] ids = intent.getLongArrayExtra(DownloadManager.EXTRA_NOTIFICATION_CLICK_DOWNLOAD_IDS);
        //点击通知栏取消下载
        downloadManager.remove(ids);
      }*/

    } catch (Exception e) {
      e.printStackTrace();
    }finally {
      if (c != null) {
        c.close();
      }
    }
  }
}

注意需要在AndroidMainfest.xml中注册receiver：

<receiver android:name=".updateapp.UpdateAppReceiver"
      android:enabled="true"
      android:exported="true">
      <intent-filter>
        <action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
        <action android:name="android.intent.action.DOWNLOAD_NOTIFICATION_CLICKED"/>
      </intent-filter>
</receiver>

通过上面三步就可以快速实现APP的在线更新 。

项目地址：UpdateAppDemo

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。