FFTDrawer/app/src/main/java/com/feemers/android/fftdrawer/SignalProcessing/Logger.java

package com.feemers.android.fftdrawer.SignalProcessing;

import android.app.Activity;
import android.util.Log;
import android.widget.TextView;

import java.io.PrintWriter;
import java.io.StringWriter;

public class Logger
{
    private TextView textView; 
    private StringBuffer sb = new StringBuffer(); 
    private String tag; 
    private Activity activity; 

    public Logger(String tag, String logInitText)
    {
        this.activity = null;
        this.tag = tag;
        sb.append(logInitText);
    }

    public Logger(Activity activity, String tag, TextView textView, String logInitText) 
    {
        this.activity = activity;
        this.tag = tag;
        this.textView = textView;
        sb.append(logInitText);
    }

    public void log(String s) 
    {
        Log.d(tag, s);
        sb.append(s).append("\n");
        if (textView != null)
        {
            if(activity !=null)
            {
                activity.runOnUiThread(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        textView.setText(sb.toString());
                    }
                });
            }
            else
            {
                textView.setText(sb.toString());
            }
        }
    }

    public void log(Exception e) 
    {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        log(sw.toString());
    }

    public void clearLog() 
    {
        sb.setLength(0);
        if (textView != null)
        {
            textView.setText("");
        }
    }

    public String getLoggedText() 
    {
        return sb.toString();
    }
}