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私は表面図を持っています。私が画面に触れるたびに、私が触れる場所に画像が現れます。素晴らしいですが、SurfaceViewにバックグラウンドを置く方法を理解することはできません。私はOnDrawを使ってすぐに背景を描こうとしましたが（タッチする必要はありません）、それは時間の一部しか動作しません。それはほとんどの時間を閉じます。Android：SurfaceViewの背景？
私のコードを見て、Surfaceビューで背景画像を取得することができますか？前もって感謝します。
class MyViewはSurfaceViewを実装していますSurfaceHolder.Callback { private Thready _thread; プライベートArrayList _graphicsz =新しいArrayList（）; プライベートGraphicObject _currentGraphic = null;
public MyView(Context context) {
super(context);
getHolder().addCallback(this);
_thread = new Thready(getHolder(), this);
setFocusable(true);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
synchronized (_thread.getSurfaceHolder()) {
GraphicObject graphic = null;
if (event.getAction() == MotionEvent.ACTION_DOWN) {
graphic = new GraphicObject(BitmapFactory.decodeResource(getResources(), R.drawable.cat1small));
graphic.getCoordinates().setX((int) event.getX() - graphic.getGraphic().getWidth()/2);
graphic.getCoordinates().setY((int) event.getY() - graphic.getGraphic().getHeight()/2);
_currentGraphic = graphic;
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
_currentGraphic.getCoordinates().setX((int) event.getX() - _currentGraphic.getGraphic().getWidth()/2);
_currentGraphic.getCoordinates().setY((int) event.getY() - _currentGraphic.getGraphic().getHeight()/2);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
_graphicsz.add(_currentGraphic);
_currentGraphic = null;
}
return true;
}
}
@Override
public void onDraw(Canvas canvas) {
canvas.drawColor(Color.BLACK);
Bitmap bitmap1;
GraphicObject.Coordinates coords1;
for (GraphicObject graphic : _graphicsz) {
bitmap1 = graphic.getGraphic();
coords1 = graphic.getCoordinates();
canvas.drawBitmap(bitmap1, coords1.getX(), coords1.getY(), null);
}
// draw current graphic at last...
if (_currentGraphic != null) {
bitmap1 = _currentGraphic.getGraphic();
coords1 = _currentGraphic.getCoordinates();
canvas.drawBitmap(bitmap1, coords1.getX(), coords1.getY(), null);
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
_thread.setRunning(true);
_thread.start();
}
public void surfaceDestroyed(SurfaceHolder holder) {
// simply copied from sample application LunarLander:
// we have to tell thread to shut down & wait for it to finish, or else
// it might touch the Surface after we return and explode
boolean retry = true;
_thread.setRunning(false);
while (retry) {
try {
_thread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
}
糸状スレッド{ プライベートSurfaceHolder _surfaceHolderを拡張クラス。 プライベートMyView _panel; プライベートboolean _run = false;
public Thready(SurfaceHolder surfaceHolder, MyView panel) {
_surfaceHolder = surfaceHolder;
_panel = panel;
}
public void setRunning(boolean run) {
_run = run;
}
public SurfaceHolder getSurfaceHolder() {
return _surfaceHolder;
}
@Override
public void run() {
Canvas c;
while (_run) {
c = null;
try {
c = _surfaceHolder.lockCanvas(null);
synchronized (_surfaceHolder) {
_panel.onDraw(c);
}
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
_surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
クラスGraphicObject { /** *グラフィックの座標を含みます。 */ public class座標{ プライベートint _x = 100; プライベートint _y = 0;
public int getX() {
return _x + _bitmap.getWidth()/2;
}
public void setX(int value) {
_x = value - _bitmap.getWidth()/2;
}
public int getY() {
return _y + _bitmap.getHeight()/2;
}
public void setY(int value) {
_y = value - _bitmap.getHeight()/2;
}
public String toString() {
return "Coordinates: (" + _x + "/" + _y + ")";
}
}
private Bitmap _bitmap;
private Coordinates _coordinates;
public GraphicObject(Bitmap bitmap) {
_bitmap = bitmap;
_coordinates = new Coordinates();
}
public Bitmap getGraphic() {
return _bitmap;
}
public Coordinates getCoordinates() {
return _coordinates;
}
}