Also, you should not call this.layout(0, 0, width, height) from
onMeasure(), it will be done for you.
On Tue, Jul 7, 2009 at 3:33 PM, Carl<carl...@gmail.com> wrote:
> Excellent, thanks.
>
> On 7 July, 17:17, Jack Ha <jack...@t-mobile.com> wrote:
>> Your Court.onDraw() function will not get called by default for
>> efficiency. You need to call setWillNotDraw(false) to enable it.
>>
>> --
>> Jack Ha
>> Open Source Development Center
>> ・T・ ・ ・Mobile・ stick together
>>
>> The views, opinions and statements in this email are those of
>> the author solely in their individual capacity, and do not
>> necessarily represent those of T-Mobile USA, Inc.
>>
>> On Jul 7, 5:30 am, Carl <carl...@gmail.com> wrote:
>>
>>
>>
>> > 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);
>> > }
>>
>> > }- Hide quoted text -
>>
>> - Show quoted text -
> >
>
--
Romain Guy
Android framework engineer
romain...@android.com
Note: please don't send private questions to me, as I don't have time
to provide private support. All such questions should be posted on
public forums, where I and others can see and answer them
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