Android编程更新apk

public void checkForUpdates() {
    // 模拟检查更新
    boolean hasUpdate = true;
    if (hasUpdate) {
        downloadApk("https://example.com/app-update.apk");
    }
}

private void downloadApk(String url) {
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "app-update.apk");
    DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
    long downloadId = manager.enqueue(request);

    // 监听下载完成
    BroadcastReceiver onComplete = new BroadcastReceiver() {
        public void onReceive(Context ctxt, Intent intent) {
            long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
            if (downloadId == id) {
                installApk();
            }
        }
    };
    registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}

private void installApk() {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(getExternalFilesDir(null) + "/app-update.apk", "application/vnd.android.package-archive");
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
}