title: Canvas and android button
body: <p>so maybe my problem will be so obvious but I've tried many trials and any of them were succesfull. So I'm writing simple program to generate fractal on canvas. But I need to add some button on this same layer and I have a problem because I can only add them on RelativeLayout and there are being hidden by canvas. How to solve it? If nedd I can paste my code.</p>
  
  <pre><code>DrawView.java
  
  package com.example.rafa.fractalsgenerator;
  
  import android.content.Context;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.Paint;
  import android.view.View;
  
  public class DrawView extends View {
  
  protected Paint paint = new Paint();
  
  public DrawView(Context context) {
      super(context);
  }
  
  @Override
  public void onDraw(Canvas canvas) {}  //this public method will be changed       in other class
   }
  </code></pre>
  
  <p>The next one:</p>
  
  <pre><code>MainActivity.java
  
  package com.example.rafa.fractalsgenerator;
  
  import android.app.Activity;
  import android.graphics.Color;
  import android.support.v7.app.ActionBarActivity;
  import android.os.Bundle;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.widget.Button;
  import android.widget.FrameLayout;
  
  
  public class MainActivity extends Activity implements View.OnClickListener {
  
  BarnsleyFern fern;
  Button button;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
      fern = new BarnsleyFern(this);
      fern.setBackgroundColor(Color.WHITE);
      button = (Button) findViewById(R.id.button);
  
      setContentView(fern);
  
    }
  
    @Override
    public void onClick(View v) {
    }
   }
  </code></pre>
  
  <p>The last java file:</p>
  
  <pre><code>BarnsleyFern.java
  
  package com.example.rafa.fractalsgenerator;
  
  import android.content.Context;
  import android.graphics.Canvas;
  import android.graphics.Color;
  
  public class BarnsleyFern extends DrawView {
  
  private double x,y,newx,newy; //coordinates of point of iteration
  private double xe,ye; //screen coordinates
  private  double rand; //generated number from [0;1) to choose corect  iteration equation
  private final int Nmax = 180000; //number of iteration
  
  public BarnsleyFern(Context context) {
      super(context);
  }
  
  @Override
  public void onDraw(Canvas canvas) {
  
      paint.setColor(Color.argb(127, 255, 0, 255));
  
      x =0;
      y= 0;  //beginning values
  
      for (int i = 0; i &lt; Nmax; i++) {
  
          rand = Math.random();
  
          if (rand &lt; 0.01) {
              x = 0;
              y = 0.16 * y;
          }
          else if (rand &lt; 0.84) {
              newx = (0.85 * x) + (0.04 * y);
              newy = (-0.04 * x) + (0.85 * y) + 1.6;
              x = newx;
              y = newy;
          }
          else if (rand &lt; 0.92) {
              newx = (0.2 * x) - (0.26 * y);
              newy = (0.23 * x) + (0.22 * y) + 1.6;
              x = newx;
              y = newy;
          }
          else {
              newx = (-0.15 * x) + (0.28 * y);
              newy = (0.26 * x) + (0.24 * y) + 0.44;
              x = newx;
              y = newy;
          }
          xe = (float) (70*x + 300);
          ye = (float) (70*y +55);
          canvas.drawCircle((float) xe, (float) ye,1,paint); //cast needed cause, drawCircle(float,x float y...)
      }
  
     }
  
    }
  </code></pre>
  
  <p>And the xml file:</p>
  
  <pre><code>&lt;RelativeLayout
  android:id="@+id/mainView"
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical"&gt;
  
      &lt;Button
          android:id="@+id/button"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Color" /&gt;
    &lt;/RelativeLayout&gt;
  </code></pre>