I'm trying to do some simple UI stuff in a game (Basketball).
I've created my own Court class (which extends ViewGroup) and I want
to add a Ball (extends View) to the court.
Unfortunately my ball doesn't show up on the court, and in fact the
court doesn't draw either.
What have I done wrong?
package test.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
public class test extends Activity
{
/** Constants */
final int FPAR = LinearLayout.LayoutParams.FILL_PARENT;
private FrameLayout main;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.addContentView(new Court(this), new LayoutParams(FPAR,
FPAR));
}
}
package test.com;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.ViewGroup;
public class Court extends ViewGroup
{
// court dimensions
private int height = 0;
private int width = 0;
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
// ball
Ball ball;
public Court(Context context)
{
super(context);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// fix the sizes here
height = this.getMeasuredHeight();
width = this.getMeasuredWidth();
this.layout(0, 0, width, height);
// create a new ball
ball = new Ball(this, 100, 100, 20, Color.RED);
// put a ball on the court
this.addView(ball);
}
@Override
public void onDraw(Canvas canvas)
{
paint.setColor(Color.RED);
Rect rect = new Rect(this.getLeft(), this.getTop(), width,
height);
canvas.drawRect(rect, paint);
// tell the ball to draw itself
ball.draw(canvas);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
// TODO Auto-generated method stub
}
}
package test.com;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.MotionEvent;
import android.view.View;
public class Ball extends View
{
private int x;
private int y;
private int r;
private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
public Ball(Court court, int x, int y, int r, int color)
{
super(court.getContext());
mPaint.setColor(color);
this.x = x;
this.y = y;
this.r = r;
this.layout(this.x, this.y, this.x + (r * 2), this.y + (2 * r));
this.setOnTouchListener(this.ballTouchListener);
}
private OnTouchListener ballTouchListener = new OnTouchListener()
{
@Override
public boolean onTouch(View view, MotionEvent event)
{
// get the location of the click
int X = (int)event.getRawX();
int Y = (int)event.getRawY();
Ball ball = (Ball)view;
// do stuff, depending on what type of touch motion is
occurring
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
ball.layout(X, Y, X + ball.getWidth(),
Y + ball.getHeight());
break;
case MotionEvent.ACTION_UP:
break;
}
return true;
}
};
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
canvas.drawCircle(this.getLeft(), this.getTop(), this.r,
mPaint);
}
}
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