How to add Canvas in a specific LinearLayout?

I am new comer to android but not to java. I have been designing UI in android through XML file, in that page i have 3 linear Layouts, in my top layout(first LinearLayout) i have kept some image and in the last layout i have kept some buttons,now i need to place a circle(of red color) in my center layout using canvas,i have written a separate class that extends View where in onDraw(Canvas canvas) ,i have drawn a circle.

package com.project.TargetTrackr3;

import android.content.Context;
import android.view.View;

public class DrawCanvasCircle extends View{
    public DrawCanvasCircle(Context mContext) {
    public void onDraw(Canvas canvas) {
        Paint paint = new Paint();
        canvas.drawCircle(20, 20, 15, paint);


Now i have to bring this canvas to the second layout,my main.xml is shown below

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  • package com.project.TargetTrackr3;
    import android.content.Context;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.LinearLayout;
    public class TargetTrackr3Activity extends Activity {
        /** Called when the activity is first created. */
          protected LinearLayout ll;
          DrawCanvasCircle c;
          public void onCreate(Bundle savedInstanceState) {
            setContentView(R.layout.main1); //layouting file 
            ll = (LinearLayout) findViewById(;//This is where i have to bring the canvas
            c = new DrawCanvasCircle(this);

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  • One Solution collect form web for “How to add Canvas in a specific LinearLayout?”

    Here is what I did to include your view.

    Start with adding a new layout to your xml file, then you can retrieve that, and then you can add to it like this:

        DrawCanvasCircle pcc = new DrawCanvasCircle (this);
        Bitmap result = Bitmap.createBitmap(25, 25, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(result);
        pcc.setLayoutParams(new LayoutParams(25, 25));

    In this example mControls is a layout that is added to the main activity layout.

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