使用Android向WhatsApp中的未保存联系人发送带有图像的消息

Question

我有这段代码可以将图片和文本分享给我的whatsapp联系人。我该如何让他获取一个EditText编号并将其发送给我，而不保存到我的联系人列表中？

public void shareImageWhatsApp() {

    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(scroll.this);
    String placa_share_whats = sharedPreferences.getString("placa","");

    //Bitmap adv = BitmapFactory.decodeResource(getResources(), R.drawable.adv);
    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/jpeg");
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    //adv.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
    File f = new File(Environment.getExternalStorageDirectory()
            + File.separator + "temporary_file.jpg");
    try {
        f.createNewFile();
        new FileOutputStream(f).write(bytes.toByteArray());
    } catch (IOException e) {
        e.printStackTrace();
    }
    share.putExtra(Intent.EXTRA_STREAM, Uri.parse( Environment.getExternalStorageDirectory()+ File.separator+placa_share_whats+".jpeg"));
    if(isPackageInstalled("com.whatsapp",this)){
        share.setPackage("com.whatsapp");
        startActivity(Intent.createChooser(share, "Share Image"));

    }else{

        Toast.makeText(getApplicationContext(), "Please Install Whatsapp", Toast.LENGTH_LONG).show();
    }

}

private boolean isPackageInstalled(String packagename, Context context) {
    PackageManager pm = context.getPackageManager();
    try {
        pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
        return true;
    } catch (PackageManager.NameNotFoundException e) {
        return false;
    }
}