我有一個益智遊戲,其中件圍繞屏幕拖動但不能重疊。如果它們嘗試重疊,則它們的位置將更改回它們不重疊的位置,並使用invalidate()重新繪製UI。除非關閉應用程序並重新啓動應用程序或更改方向時,除非該活動被銷燬並重新構建,否則該方法運行良好。活動重新啓動後功能發生變化
什麼似乎發生的是,我用於碰撞(x,y,右,底等)的位置變量不會重置爲它們在構造函數中如何初始化。碎片與不可見物體相撞,撞擊到看起來隨機的位置,或者移動不規則。
解決它的唯一方法是手動殺死應用程序(如使用任務殺手)或重新安裝它。然後它會正常工作,直到遊戲活動再次創建。我究竟做錯了什麼?有任何想法嗎?這裏的一塊是如何在OnCreate()添加我GameView類中:
Pieces redtiki = new Pieces(this,0,0,R.drawable.tikired);
...
board.addView(redtiki);
這是我的小品類的一部分:
public class Pieces extends View{
private int x;
private int y;
private int width;
private int height;
private int right;
private int bottom;
private int initialX;
private int initialY;
private Bitmap sizedBitmap;
private Bitmap sourceBitmap;
private int boardSize = 6;
public static ArrayList<Pieces> aPieces = new ArrayList<Pieces>();
//private final Paint mPaint = new Paint();
public Pieces(Context context, int x, int y, int img){
super(context);
this.x = x;
this.y = y;
sourceBitmap = BitmapFactory.decodeResource(getResources(), img);
aPieces.add(this);
initialX=x;
initialY=y;
}
private void sizePiece(){
int scaledWidth;
int scaledHeight;
int h = sourceBitmap.getHeight();
int w = sourceBitmap.getWidth();
if (h>w){
scaledWidth = 1;
}else if (w>h){
scaledWidth = w/h;
}else{
scaledWidth = 0;
}
if (h>w){
scaledHeight = h/w;
}else if (w>h){
scaledHeight = 1;
}else{
scaledHeight = 0;
}
int dstWidth = (((((View) getParent()).getWidth())*scaledWidth)/boardSize)-1;//TODO make sure that -1 is necessary for
int dstHeight = (((((View) getParent()).getHeight())*scaledHeight)/boardSize)-1;//fitting all pieces on the board
sizedBitmap = Bitmap.createScaledBitmap(sourceBitmap, dstWidth, dstHeight, true);
width = sizedBitmap.getWidth();
height = sizedBitmap.getHeight();
right = x+width;
bottom = y+height;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
sizePiece();
canvas.drawBitmap(sizedBitmap, x, y, null);
}
@Override
public boolean onTouchEvent(MotionEvent event){
float eventX = event.getX();
float eventY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//check if touch is on piece
if (eventX > x && eventX < (x+width) && eventY > y && eventY < (y+height)){
initialX=x;
initialY=y;
break;
}else{
return false;
}
case MotionEvent.ACTION_MOVE:
//determine if piece should move horizontally or vertically
if(width>height){
for (Pieces piece : aPieces) {
//if object equals itself in array, skip to next object
if(piece==this){
continue;
}
//check if there the possibility for a horizontal collision
if(this.isAllignedHorizontallyWith(piece)){
//check for and handle collisions while moving left
if(this.isRightOf(piece)){
if(eventX>piece.right+(width/2)){
x = (int)(eventX-(width/2)); //move normally
/*for(Pieces piece2 : aPieces){
if(this.isAllignedHorizontallyWith(piece2)){
if(this.isLeftOf(piece2)){
if(eventX<piece2.x-(width/2)){
x = (int)(eventX-(width/2));
continue;
}else{
x = piece2.x-width-1;
}
}
}
}*/
continue;
}else{
x = piece.right+1;
}
}
//check for and handle collisions while moving right
if(this.isLeftOf(piece)){
if(eventX<piece.x-(width/2)){
x = (int)(eventX-(width/2));
continue;
}else{
x = piece.x-width-1;
}
}
break;
}else{
x = (int)(eventX-(width/2));
}
}
}
if(height>width){
for (Pieces piece : aPieces) {
//if object equals itself in array, skip to next object
if(piece==this){
continue;
}
//check if there the possibility for a vertical collision
if(this.isAllignedVerticallyWith(piece)){
//check for and handle collisions while moving up
if(this.isBelow(piece)){
if(eventY>piece.bottom+(height/2)){
y = (int)(eventY-(height/2)); //move normally
continue;
}else{
y = piece.bottom+1;
}
}
//check for and handle collisions while moving down
if(this.isAbove(piece)){
if(eventY<piece.y-(height/2)){
y = (int)(eventY-(height/2));
continue;
}else{
y = piece.y-height-1;
}
}
break;
}else{
y = (int)(eventY-(height/2));
}
}
}
invalidate();
break;
case MotionEvent.ACTION_UP:
// end move
if(this.moves()){
GameView.counter++;
}
initialX=x;
initialY=y;
break;
}
// parse puzzle
invalidate();
return true;
}
感謝您的回答。你對onCreate()只調用一次是正確的。我誤解了方向變化時會發生什麼。它會銷燬活動,但它不會再次調用onCreate()。我正在自學編程,雖然我已經學會了一些關於Android的知識,但我不確定如何使用日誌語句。你知道有什麼好的資源可以讓我開始嗎?謝謝你的幫助。 – Amplify91 2011-03-20 06:20:24
@ Amplify91日誌語句用於向控制檯輸出/打印信息。 [http://developer.android.com/reference/android/util/Log.html] [http://stackoverflow.com/questions/2018263/android-logging]第二個鏈接將幫助您定製/增強日誌功能。我會建議開始使用第一個鏈接,並且在您理解/使用該概念後,您可以前進到第二個鏈接。 – 2011-03-20 11:41:39
再次感謝您的幫助!我已經解決了我的問題,並且我也學會了如何使用日誌消息。感謝您的幫助和有用的鏈接。 – Amplify91 2011-04-05 00:12:31