Android:如何从我们的应用程序中安装类似于playstore的下载应用程序

import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.Environment;

public class AppDownloader {
    private DownloadManager downloadManager;
    private long downloadId;

    public void downloadApplication(Context context, String downloadUrl, String appName) {
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(downloadUrl));
        request.setTitle(appName);
        request.setDescription("Downloading " + appName);
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, appName + ".apk");

        downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
        downloadId = downloadManager.enqueue(request);

        // 注册广播接收器以接收下载完成的通知
        context.registerReceiver(downloadCompleteReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
    }

    private BroadcastReceiver downloadCompleteReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            long completedDownloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
            if (completedDownloadId == downloadId) {
                // 下载完成，开始安装应用程序
                Uri apkUri = downloadManager.getUriForDownloadedFile(downloadId);
                Intent installIntent = new Intent(Intent.ACTION_VIEW);
                installIntent.setDataAndType(apkUri, "application/vnd.android.package-archive");
                installIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(installIntent);

                // 注销广播接收器
                context.unregisterReceiver(this);
            }
        }
    };
}

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