Hello,
I've patterned my initial code from another tutorial to create classes
to handle drawing to a SurfaceView. This tutorial (and others I've
found) associate an xml-defined SurfaceView to a class which intiates
upon creation.
My goal is to initiate animation in an xml-defined surface view upon
pushing a button in my layout and terminating it when I push it
again. Furthermore, the animation must run inside the region I've
specified in my xml (rather than the entire display) confined to that
region and not disturb the other widgets on the layout.
For simplicity, I'm currently only drawing a circle in the surfaceview
until I figure out how to get my layout working.
So, when I click the Go button (BattleActivity::onClick), my surface
view is created and drawn, but it fills the entire display covering
the other controls in my layout including the button. I want the
animation to take place only in the surface view defined as part of my
layout (id=battleView).
Here's a sub-layout section of my XML code (tabBattle.xml).
<LinearLayout
android:orientation="vertical"
android:gravity="center"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<SurfaceView
android:id="@+id/battleView"
android:layout_weight="70"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"/>
<Button
android:onClick="onClick"
android:text=" Go "
android:gravity="center"
android:layout_weight="30"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
Here's my main activity class. This is created when I navigate to the
tab view where its layout (tabBattle) resides. The onClick is called
when I push the Go button. My intention in onClick is to get the
surface view, create a new BattleView instance, and and pass the
surface view context to the BattleView constructor. Based on my
tests, this clearly is not correct but I have no idea how else to
accomplish my goal.
public class BattleActivity extends Activity implements
View.OnClickListener
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.tabbattle);
}
@Override
public void onClick(View v)
{
SurfaceView battleSurface =
(SurfaceView)findViewById(R.id.battleView);
setContentView(new BattleView( battleSurface.getContext() ));
}
}
SurfaceView subclass:
public class BattleView extends SurfaceView implements
SurfaceHolder.Callback
{
private int circleRadius;
private Paint circlePaint;
UpdateThreadBattle updateThread;
private int width;
private int height;
private int xPos;
private int yPos;
private int xVel;
private int yVel;
public BattleView(Context context)
{
super(context);
getHolder().addCallback(this);
circleRadius = 10;
circlePaint = new Paint();
circlePaint.setColor(Color.BLUE);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
canvas.drawCircle(xPos, yPos, circleRadius, circlePaint);
}
@Override
public void surfaceCreated(SurfaceHolder holder)
{
Rect surfaceFrame = holder.getSurfaceFrame();
width = surfaceFrame.width();
height = surfaceFrame.height();
// do stuff herre
updateThread = new UpdateThreadBattle(this);
updateThread.setRunning(true);
updateThread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0)
{
boolean retry = true;
updateThread.setRunning(false);
while (retry) {
try {
updateThread.join();
retry = false;
} catch (InterruptedException e) {
}
}
}
}
Any help is greatly appreciated!
Greg
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