Android应用内版本检查

Question

当我的应用程序打开时,我想在Google Play上查看应用程序版本.如果App的版本高于已安装的应用程序,我想通知用户更新应用程序.我从这里发现了"android-query"jar ,在此我无法动态检查版本,我想设置Major,Minor或Revision.有人请帮帮我怎么办？

提前致谢

Answer 1

基本上,您应该检查市场中应用程序的最新版本以及设备上的应用程序版本,并确定是否有可用的更新.为此,请尝试这样做:

您应该使用它来获取当前版本(设备上的应用程序版本):

private String getCurrentVersion(){
PackageManager pm = this.getPackageManager();
PackageInfo pInfo = null;

        try {
            pInfo =  pm.getPackageInfo(this.getPackageName(),0);

        } catch (PackageManager.NameNotFoundException e1) {
            e1.printStackTrace();
        }
        String currentVersion = pInfo.versionName;

        return currentVersion;
    }

并使用它来获取Google Play中的最新版本(取自/sf/answers/2305994981/):

private class GetLatestVersion extends AsyncTask<String, String, String> {
String latestVersion;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... params) {
        try {
            //It retrieves the latest version by scraping the content of current version from play store at runtime
            String urlOfAppFromPlayStore = "https://play.google.com/store/apps/details?id= your app package address";
            Document  doc = Jsoup.connect(urlOfAppFromPlayStore).get();
            latestVersion = doc.getElementsByAttributeValue("itemprop","softwareVersion").first().text();

        }catch (Exception e){
            e.printStackTrace();

        }

        return latestVersion;
    }
}

然后,当您的应用启动时,请检查彼此,如下所示:

String latestVersion = "";
        String currentVersion = getCurrentVersion();
        Log.d(LOG_TAG, "Current version = " + currentVersion);
        try {
            latestVersion = new GetLatestVersion().execute().get();
            Log.d(LOG_TAG, "Latest version = " + latestVersion);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

        //If the versions are not the same
        if(!currentVersion.equals(latestVersion)){
            final AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("An Update is Available");
            builder.setPositiveButton("Update", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    //Click button action
                    startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=your app package address")));
                    dialog.dismiss();
                }
            });

            builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    //Cancel button action
                }
            });

            builder.setCancelable(false);
            builder.show();
        }

并显示用户更新对话框.但请确保您已导入jsoup库.

额外:要导入jsoup库,请按照下列步骤操作:

1-转到文件菜单
2-项目结构
3-左侧单击应用程序
4-选择依赖项选项卡
5-单击+
6-单击库依赖项
7-搜索"jsoup"
8-选择org.jsoup:jsoup并单击确定

Answer 2

如果您不想使用像Jsoup这样的库,可以使用类似的东西从Google Play获取当前版本号:

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.MalformedURLException;
import java.net.URL;

public class StackAppVersion {

    public static void main(String[] args) {
        try {
            System.out.println(currentVersion());
        } catch (IOException ex) {
            System.out.println("Failed to read Google Play page!");
        }
    }

    private static String currentVersion() throws IOException {
        StringBuilder sb = new StringBuilder();

        try (Reader reader = new InputStreamReader(
                new URL("https://play.google.com/store/apps/details?id=com.stackexchange.marvin&hl=en")
                        .openConnection()
                        .getInputStream()
                , "UTF-8"
        )) {
            while (true) {
                int ch = reader.read();
                if (ch < 0) {
                    break;
                }
                sb.append((char) ch);
            }
        } catch (MalformedURLException ex) {
            // Can swallow this exception if your static URL tests OK.
        }

        String parts[] = sb.toString().split("softwareVersion");

        return parts[1].substring(
                parts[1].indexOf('>') + 1, parts[1].indexOf('<')
        ).trim();
    }
}

如果在URL中保留"&hl = en",则UTF-8的字符编码应该没问题.