在图像视图顶部绘制圆形

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当前位于视图上，我有一个ImageView和一个在视图上绘制圆的自定义类。它将在视图上画圆，但它隐藏在图像视图后面。我知道它的存在，因为当半径足够大时，我可以看到一个不在imageview后面的小部分。什么代码会把它带到前面？在图像视图顶部绘制圆形

编辑：发现上述问题不是问题。它似乎只是在为视图上的搜索栏保留的部分上绘制它？

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.image_process); 
    mDraw = new Draw(this); 

    addContentView(mDraw, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

    seekBar1 = (SeekBar) findViewById(R.id.seekBar1); 
    b = (Button) findViewById(R.id.button1); 
    seekBar1.setMax(500); 

    seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){ 

     public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) { 
      mDraw.setCords(500, 500, seekBar1.getProgress()); 
     } 

     public void onStartTrackingTouch(SeekBar seekBar) { 
      mDraw.setCords(500, 500, seekBar1.getProgress());    
     } 

     public void onStopTrackingTouch(SeekBar seekBar) { 
      mDraw.setCords(500, 500, seekBar1.getProgress());    
     } 

    }); 



}

这里是绘制类：

package org.DTS.boltsize; 

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Rect; 
import android.view.View; 

public class Draw extends View { 
    private int x = 1; 
    private int y = 1; 
    private int r = 1; 


    public Draw(Context context) { 

      super(context); 

      // TODO Auto-generated constructor stub 

    } 

public void setCords(int mx, int my, int mr){ 
    x = mx; 
    y = my; 
    r = mr; 
} 


    protected void onDraw(Canvas canvas) { 

      // TODO Auto-generated method stub 

System.out.println("Drew :)"); 


      Paint paint = new Paint(); 

      paint.setStyle(Paint.Style.FILL); 

      paint.setColor(Color.RED); 

canvas.drawCircle(x, y, r, paint); 
      super.onDraw(canvas); 

    } 

    public void DrawCirlce(Canvas canvas, int x, int y, int r){ 
     Paint paint = new Paint(); 
     paint.setStyle(Paint.Style.STROKE); 
     paint.setColor(Color.GREEN); 
     canvas.drawCircle(x, y, r, paint); 
     super.onDraw(canvas); 
    } 





}

这里是什么样子。这个红圈应该覆盖整个屏幕。 enter image description here