adding button onto a view programatically

Question

If I want to add a button in this class so that I can call the onclicklistener, how should I do it?i have also provided the activity class onto which i am adding this view.

activity:

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.RelativeLayout;

import android.content.Context;



public class NewGame extends Activity {

View view;
Context context;
RelativeLayout layout;
GameView gameview;

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    gameview=new GameView(this);
    setContentView(gameview);
    //layout = (RelativeLayout) findViewById(R.id.relative_layout);



    //layout.addView(gameview);

}


}

view: public class GameView extends View { Path circle; Paint cPaint; Paint tPaint; String z; int i = 65, strt, arc, leftx, topy, rightx, bottomy, maxx, maxy; boolean flag1, flag2, flag3; double n1, n2; int n, n3 = 180,n4,n5 = 90; float f1 = 180, f2 = 90; Button b1; Random r = new Random(); RectF oval;

    public GameView(Context context) {
        super(context);

        leftx = 0;
        topy = 60;
        rightx = 150;
        bottomy = 120;

        z = String.valueOf(Character.toChars(i));

        cPaint = new Paint();
        cPaint.setColor(Color.RED);

        strt = 45;
        arc = 315;

        n1 = Math.random() * 600;
        Log.d("random", z);

        if (flag2 == false)
            new DrawThread(this);

        // cPaint.setStrokeWidth(2);
        tPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        tPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        tPaint.setColor(Color.BLACK);
        float scale = getResources().getDisplayMetrics().scaledDensity;
        tPaint.setTextSize(20 * scale);
    }

    public void onSizeChanged(int w,int h,int oldh,int oldw) {
        maxx = oldw;
        maxy = oldh;
    }

    //@Override
    protected void onDraw(Canvas canvas) {
        // Drawing commands go here
        oval = new RectF(leftx,topy,rightx,bottomy);
        canvas.drawArc(oval, strt, arc, true, cPaint);
        while (i < 90)  {
            canvas.drawText(String.valueOf(Character.toChars(i)),f1,f2, tPaint);
            break;
        }
    }
}

user2532769 · Accepted Answer · 2013-07-18 12:01:29Z

1

You can do it like this:

Button bt = new Button(this);
bt.setText("A Button");
bt.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
linerLayout.addView(bt);

And then you can do this

bt.setOnClickListener(new View.OnClickListener() {

//TO DO
}

I hope that this can help you.

answered Jul 18, 2013 at 12:01

user2532769

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Comments

Apperside · Accepted Answer · 2013-07-18 12:05:38Z

0

first of all in order to allow to your custom view to have an addView(View v) method it must extend ViewGroup instead of View; then you can use this code

b1=new Button(context);
b1.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT ));
b1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

            }
        });
        this.addView(b1);

answered Jul 18, 2013 at 12:05

Apperside

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30 Comments

user2586942 Over a year ago

after doing what you mentioned above i am now getting a blank screen.what do you think can be the problem ?

Apperside Over a year ago

try to set an id for the button b1.setId(1234)

user2586942 Over a year ago

still getting a blank screen

Apperside Over a year ago

try adding text with b1.setText("your text") and using LayoutParams.FILL_PARENT instead of LayoutParams.WRAP_CONTENT. what if you don't put in your custom view the code for the button? how are you adding your custom view to the layout? in xml or by code?

user2586942 Over a year ago

sir i have also provided the activity class above.

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