Android/C# Socket - Decode/Enconde String64 Error after 1 frame

Question

I created a C# server that sends an Bitmap through a socket to android client. That Bitmap is constantly updating because it's a video feed.

Server C#

private void send_data() {
    ImageConverter converter = new ImageConverter();
    byte[] sendBytes = (byte[]) converter.ConvertTo(master.picturebox_master.Image, typeof(byte[]));

    string_master_frame = System.Text.Encoding.UTF8.GetString(sendBytes);
    string_master_frame = Convert.ToBase64String(sendBytes);

    data = string_master_frame + "\n";

    tcpServer1.Send(data);
}

Client Android

@Override
protected Void doInBackground(Void... arg0) {
    Socket socket = null;
    try {
        socket = new Socket(dstAddress, dstPort);
        Scanner r = new Scanner(new InputStreamReader(socket.getInputStream()));

        while (true) {
            valores[26] = r.nextLine();

            publishProgress(valores[26]);
        }
        return null;
    }

    @Override
    protected void onProgressUpdate(String... values) {

    byte[] decodedString = Base64.decode(values[26], Base64.NO_WRAP);
        Bitmap master_bitmap = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
        master_frame.setImageBitmap(master_bitmap);

    }

The first frame is sent and the Android client displays it correctly. But when the next frame comes, the Android Client Crashes.

Error:

Process: com.example.tiago.java_android, PID: 826 java.lang.IllegalArgumentException: bad base-64 at android.util.Base64.decode(Base64.java:161) at android.util.Base64.decode(Base64.java:136) at android.util.Base64.decode(Base64.java:118) at com.example.tiago.java_android.Cliente.onProgressUpdate(Cliente.java:228) at com.example.tiago.java_android.Cliente.onProgressUpdate(Cliente.java:28) at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:656) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5431) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:914) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)

I though the valores[26] data was being corrupted but it's not. I get the data correctly. I used http://codebeautify.org/base64-to-image-converter to check if I get the data correctly.

Any idea?

PS: I lost my account so I had to make this one.

Bitmap master_bitmap;

byte[] decodedString = Base64.decode(values[26],Base64.NO_WRAP);
    master_bitmap = BitmapFactory.decodeByteArray(decodedString,0,decodedString.length);
    if(master_bitmap != null)
    {
        try {
            master_frame.setImageBitmap(master_bitmap);
        }
        catch (IllegalArgumentException e)
        {
            e.printStackTrace();
        }
    }
    master_bitmap.recycle();


}

Didnt work. Error:

java.lang.RuntimeException: Canvas: trying to use a recycled bitmap

Answer 1

Did you try with try/catch block I explained previously?

Recall:

I had the same problem and I am almost sure this will solve your problem:

    String[] safe = values[26].split("=");
    byte[] decodedString = Base64.decode(safe[0],Base64.NO_WRAP);
    Bitmap master_bitmap = BitmapFactory.decodeByteArray(decodedString,0,decodedString.length);
    master_frame.setImageBitmap(master_bitmap);
    master_bitmap.recycle(); //THIS LINE WAS ENOUGH TO FIX MY CODE

Also, don't forget to use try/catch blocks effectively.

try{ //code here} catch(IllegalArgumentException e){ //code here if you want} (Add more catch statements if necessary.)

My full code for further help:

byte[] bytearray = Base64.decode(dataIn);
Bitmap myBitmap = BitmapFactory.decodeByteArray(bytearray, 0,bytearray.length);
if (myBitmap!=null) {
  //some irrelevant code here to turn bitmap to a PImage (a Processing image class)
}
myBitmap.recycle();

This works perfectly for me.

---

Try also this:

try { 
  Bitmap master_bitmap; 
  master_bitmap=BitmapFactory.decodeByteArray(decodedString, 0, ‌​decodedString.‌​leng‌​th); 
  if (master_bitmap != null) {  //might be an unnecessary if condidition
    try { 
      if (((BitmapDrawable)master_frame.getDrawable()).getBitmap()!=null) { 
        ((BitmapDrawable)master_frame.getDrawable()).getBitmap().recycle();
      }
      master_frame.setImageBitmap(master_bitmap);
      //maybe try here: master_bitmap.recycle();
    } 
    catch(RuntimeException e) { 
      e.printStackTrace();
    }
  }
} 
catch (IllegalArgumentException e) { 
  e.printStackTrace();
}