我的应用程序显示了一堆位图，它们一个接一个地动画，因为它存储在Bitmap数组中，最初当应用程序启动时，curPosition为0，以便在索引0处开始动画化obj。handleMessage将为每个obj设置动画。当应用程序第一次启动时，每个obj之间的延迟为1000毫秒，因此当应用程序第一次启动时，handleMessage会正常地为每个对象设置动画。
问题是我双击重启按钮位图。我使用了GestureDetector类，并且我通过位图构建了一个Restart按钮，当我监听onDoubleTap时，会发生什么是handleMessage将通过每个位图重新启动它们的动画。
出于某种原因，当我双击Restart按钮位图时，handleMessage正在运行，我知道这一点，因为我输入了一个logcat消息，并且在update方法中我看到它通过每个curPosition运行，所以我的意思是这个line：Log.i（＆＃34; cur pos。到目前为止：＆＃34;，＆＃34;＆＃34; + curPosition）;
但我不会直观地看到通过更新方法运行的动画，除非我中断应用程序（即关闭应用程序或最小化然后恢复应用程序）并双击“重新启动”按钮位图和双击“重新启动”按钮位图仅适用于此我需要中断应用程序才能让它再次运行。
public class MainActivity extends Activity implements
GestureDetector.OnGestureListener,
GestureDetector.OnDoubleTapListener {
private MySurfaceView mysurfaceView;
private Bitmap restart_buttonBitmap;
private GestureDetector mGestureDetector;
private MiniProj2Button restart;
private MiniProj2Button newLevel;
private final int SIZE = 5;
private final int DELAY = 1000;
private Bitmap[] myObjs = new Bitmap[ SIZE ];
//Screen size info
private int screenWidth;
private int screenHeight;
//The size in pixels of a place on the game board
private int blockSize;
private int numBlocksWide;
private int numBlocksHigh;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mySurfaceView = new MySurfaceView(this);
setContentView(mySurfaceView);
// Create a GestureDetector
mGestureDetector = new GestureDetector(this, this);
// Attach listeners that'll be called for double-tap and related gestures
mGestureDetector.setOnDoubleTapListener( this );
}//END METHOD: onCreate
@Override
protected void onStop() {
super.onStop();
Log.d("onStop", "Main Activity's onStop called");
gameView.surfaceDestroyed( mySurfaceView.getHolder() );
this.finish();
}
@Override
protected void onResume() {
super.onResume();
Log.d("onResume", "Main Activity's onResume called");
mySurfaceView = new MySurfaceView(this);
setContentView(mySurfaceView);
mySurfaceView.surfaceCreated( mySurfaceView.getHolder() );
}
@Override
protected void onPause() {
super.onPause();
Log.i("onPause", "Main Activity's onPause called");
mySurfaceView.surfaceDestroyed( mySurfaceView.getHolder() );
}
@Override
public boolean onDoubleTap(MotionEvent e) {
//reset animation if Restart button pressed!
if ( restart.isButtonTouched(e.getX(), e.getY(), blockSize,blockSize) ) {
curPosition = 0;
}
return true;
}
public void configureDisplay() {
//find out the width and height of the screen
Display display =
getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
screenHeight = size.y;
//Determine the size of each block/place on the board
// blockSize = screenWidth/10;
blockSize = screenWidth/10;
//Determine how many blocks will fit into the
//height and width
// numBlocksWide = 10;
numBlocksWide = 10;
numBlocksHigh = ( ( screenHeight ) ) / blockSize;
}//END METHOD: configureDisplay
@Override
public boolean onTouchEvent(MotionEvent e) {
mGestureDetector.onTouchEvent(e);
return super.onTouchEvent(e);
}//END onTouchEvent
class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback, Handler.Callback {
Canvas canvas = new Canvas();
SurfaceHolder surfaceHolder;//this lets us access the canvas but still need to use Canvas class
Handler myHandler;
Paint paint = new Paint ();
public MySurfaceView(Context context) {
super(context);
paint.setColor(Color.argb(255, 0, 0, 0));
path = new Path ();
myHandler = new Handler(this);
getHolder().addCallback(this);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
this.surfaceHolder = holder;
myHandler.sendEmptyMessage(0);
}
@Override
public void surfaceChanged(SurfaceHolder holder,
int format, int width, int height) {
// What do I enter here???
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.i("Me", "surfaceDestroyed: bye!" );
myHandler.removeCallbacksAndMessages(null);
}
protected void drawIt ( ) {
if ( surfaceHolder.getSurface().isValid() ) {
canvas = surfaceHolder.lockCanvas();
canvas.drawColor(Color.WHITE);//the background
//for each obj, draw it
surfaceHolder.unlockCanvasAndPost(canvas);
}//END IF BLOCK: For valid surfaceHolder
}//END METHOD: drawIt
public void update() {
Log.i ("cur pos. so far:", "" + curPosition );
if ( curPosition < SIZE ) {
myObjs [ curPosition ].animateMe ( );
curPosition++;
}
}//END METHOD: update
@Override
public boolean handleMessage(Message msg) {
if (curPosition < SIZE ) {
Log.i("Still objs 2 animate","Yes");
Log.i ("cur pos. so far:", "" + curPosition );
gameView.update();
gameView.drawIt();
myHandler.sendEmptyMessageDelayed(msg.what, DELAY);
}
else {
myHandler.sendEmptyMessageDelayed(msg.what, 10);
gameView.drawIt();
}
return true;
}//END METHOD: handleMessage
}//END INNER CLASS: MySurfaceView
}//END CLASS: MainActivity