我对我的代码有疑问。我希望每次有人触摸显示器时我的位图都会改变。
protected boolean processTouch(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
player.setGraphic(BitmapFactory.decodeResource(Game.res, R.drawable.sprite2));
}
return true;
}
在我的 player.java 文件中，我输入：
public class Player extends Sprite
{
public Player(int x, int y)
{
super(BitmapFactory.decodeResource(Game.res, R.drawable.sprite1), x-350, y, 50, 17, 5, 2);
}
public void update()
{
getGraphic();
}
public Bitmap getGraphic()
{
return bitmap;
}
public void setGraphic(Bitmap bitmap)
{
this.bitmap = bitmap;
}
private Bitmap bitmap;}
我的 Sprite 类包含：
public Sprite(Bitmap bitmap, int x, int y, int width, int height, int fps, int frameCount)
{
this.bitmap = bitmap;
}
public Bitmap getGraphic()
{
return bitmap;
}
private Bitmap bitmap;
然后我想显示它：
canvas.drawBitmap(s.getGraphic(), s.getSourceRect(), destRect, null);
但是，当我尝试启动游戏时，它崩溃了。我怎么解决这个问题？
编辑：
日志：
02-15 15:29:51.174: I/ActivityManager(18563): Displayed com.example.nic_beta/.Game: +488ms
02-15 15:29:51.197: W/dalvikvm(29635): threadid=11: thread exiting with uncaught exception (group=0x419cb930)
02-15 15:29:51.197: E/AndroidRuntime(29635): FATAL EXCEPTION: Thread-23004
02-15 15:29:51.197: E/AndroidRuntime(29635): java.lang.NullPointerException
02-15 15:29:51.197: E/AndroidRuntime(29635): at android.graphics.Canvas.throwIfRecycled(Canvas.java:1025)
02-15 15:29:51.197: E/AndroidRuntime(29635): at android.graphics.Canvas.drawBitmap(Canvas.java:1127)
02-15 15:29:51.197: E/AndroidRuntime(29635): at com.example.nic_beta.Panel.onDraw(Panel.java:70)
02-15 15:29:51.197: E/AndroidRuntime(29635): at com.example.nic_beta.RunnerThread.run(Panel.java:187)
02-15 15:29:51.213: W/ActivityManager(18563): Force finishing activity com.example.nic_beta/.Game
02-15 15:29:51.260: W/ActivityManager(18563): Force finishing activity com.example.nic_beta/.Menu