I am trying to adapt a snake game in Android Studio so that game over triggers a GameOverActivity. The problem is that the game over text is currently written to the screen in the redrawCanvas() function:
public void redrawCanvas(Canvas canvas) {
if (this.snake.isEnabled()) {
this.snake.draw(canvas);
this.apple.draw(canvas);
this.score.draw(canvas);
} else {
Paint p = getPaint();
p.setTextSize(50);
p.setColor(Color.BLACK);
canvas.drawText("Game over!", 100, 100, p);
// LAUNCH PLAY AGAIN ACTIVITY HERE?
}
}
and this redrawCanvas code is contained in a class extending SurfaceView. I would ordinarily call an intent, but I can’t call startActivity() from within a SurfaceView class. My SnakeGameActivity just sets the content view, and all the code occurs in this surface view. Here is the code in SnakeGameActivity:
public class SnakeGameActivity extends com.codepath.simplegame.GameActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//before activity is created : cold start
//switch back to original Theme (App Theme)
setTheme(R.style.AppTheme);
switchFullscreen();
setContentView(new SnakeGamePanel(this));
}
}
And here is the full code in SnakeGamePanel:
public class SnakeGamePanel extends AbstractGamePanel {
public SnakeGamePanel(Context context) {
super(context);
}
private SnakeActor snake;
private AppleActor apple ;
private ScoreBoard score;
private boolean isPaused = false;
@Override
public void onStart() {
this.snake = new SnakeActor(100, 100);
this.apple = new AppleActor(200, 50);
this.score = new ScoreBoard(this);
}
@Override
public void onTimer() {
if (!isPaused) {
if (this.snake.checkBoundsCollision(this)) {
this.snake.setEnabled(false);
}
this.snake.move();
if (this.apple.intersect(this.snake)) {
this.snake.grow();
this.score.earnPoints(50);
this.apple.reposition(this);
}
}
}
@Override
public void redrawCanvas(Canvas canvas) {
if (this.snake.isEnabled()) {
this.snake.draw(canvas);
this.apple.draw(canvas);
this.score.draw(canvas);
} else {
Paint p = getPaint();
p.setTextSize(50);
p.setColor(Color.BLACK);
canvas.drawText("Game over!", 100, 100, p);
// LAUNCH PLAY AGAIN ACTIVITY?
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
this.snake.handleKeyInput(keyCode);
if (keyCode == KeyEvent.KEYCODE_G) {
this.onStart();
}
if (keyCode == KeyEvent.KEYCODE_P) {
isPaused = !isPaused;
}
return true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
this.snake.handleTouchInput(event);
return true;
}
return false;
}
}
Is there any way to start an activity when the game ends?
2
Answers
I found what seems to be a solution so far. I just made the SurfaceView extension class be an inner class in my activity. That way, it has an activity as a containing class.
One alternative to your inner class solution is to pass a
Context
object to the constructor of yourSurfaceView
subclass. Then you can callstartActivity()
on that context.