问如何程序化启动应用程序？

EN

  public void checkXposedInstaller() {
    String packageName = "de.robv.android.xposed.installer";
    //check if app is installed
    try {
        PackageManager manager = getPackageManager();
        Intent i = manager.getLaunchIntentForPackage(packageName);
        if (i == null)
            throw new PackageManager.NameNotFoundException();
        i.addCategory(Intent.CATEGORY_LAUNCHER);
        checkXposedFramework();
    } catch (PackageManager.NameNotFoundException e) {
        Toast.makeText(this, "app not found", Toast.LENGTH_LONG).show(); //*** download and root install apk
        // search on browser/market
        try {
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + packageName));
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
        } catch (android.content.ActivityNotFoundException e1) {
            Toast.makeText(this, "no app found to handle request", Toast.LENGTH_LONG).show();
        }
    }
}