FFTDrawer/app/src/main/java/com/feemers/android/fftdrawer/BarChartView.java

package com.feemers.android.fftdrawer;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class BarChartView extends SurfaceView implements Runnable {

    private Animation animation;
    private SurfaceHolder surfaceHolder;
    private Thread thread = null;
    private volatile boolean running = false;
    private int backgroudColor = 0;
    private String name = "";
    private int sleepTime = 0;
    private volatile boolean update;


    public BarChartView(Context context) {
        super(context);
        surfaceHolder = getHolder();
    }
    public BarChartView(Context context, AttributeSet attributeSet){
        super(context, attributeSet);
        surfaceHolder = getHolder();
        ReadXML(attributeSet);
    }
    private void ReadXML(AttributeSet attributeSet){
        android.content.res.TypedArray typedArray = getContext().obtainStyledAttributes(attributeSet, R.styleable.BarChartView);
        //String s = typedArray.getString(R.styleable.GrafikView_android_text);
        //name = (s!=null) ? s : "";
        backgroudColor = typedArray.getColor(R.styleable.BarChartView_backgroundColor, Color.BLACK);
        typedArray.recycle();
        log(", hintergrundFarbe=" + backgroudColor);
    }

    public void setAnimation(Animation animation){
        this.animation = animation;
        this.animation.SetBackgroundColor(backgroudColor);
    }

    private void log(String s) {
        Log.d(this.getClass().getSimpleName(), s);
    }

    public void Start(){
        running = true;
        thread = new Thread(this);
        thread.start();
        log("Thread started");
    }

    public void Stop(){
        running = false;
        while(true){
            try{
                thread.join();
                log("Thread stopped");
                break;
            }catch (InterruptedException e){
                e.printStackTrace();
            }
        }
    }
    public void Draw(){
        update = true;
    }

    @Override
    public void run() {
        while (running) {
            if (update) {
                if (!surfaceHolder.getSurface().isValid()) {
                    continue;
                }
                Canvas canvas = surfaceHolder.lockCanvas();
                if (animation != null) {
                    animation.Draw(canvas);
                    update = false;
                }
                surfaceHolder.unlockCanvasAndPost(canvas);
            }
            try {
                Thread.sleep(5);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}