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사용자가 화면에서 도형을 드래그 할 수있는 앱이 있습니다. 드래그를 위해 사용자 지정 표면 뷰를 사용합니다. 표면 뷰는 OnTouchEvent를 얻을 때마다 그래픽 이미지의 위치를 변경하고 OnDraw를 호출하여 화면을 업데이트합니다.무효가 화면을 업데이트하지 않습니다.
그래서 touchevent가 발생할 때까지 비트 맵 이미지는 그려지지 않습니다. 나는 Costume 표면보기를 무효화하려고 시도했지만, 디버거에 따르면 OnDraw는 결코 호출되지 않습니다.
몇 가지 중 하나가 화면에게 닿을 때까지 그래서 지금 내 화면이 비어
// 코드
public class cPlay extends cBase implements OnClickListener {
/** Called when the activity is first created. */
// sound
private SoundPool soundPool;
private int soundID;
boolean loaded = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.play);
int w=getWindowManager().getDefaultDisplay().getWidth();
int h=getWindowManager().getDefaultDisplay().getHeight();
BallView ballView=new BallView(this,w,h);
setContentView(ballView);
// Does not update screen??????
ballView.invalidate();
....
...
....} // end of class
public class BallView extends SurfaceView implements SurfaceHolder.Callback {
private Bitmap bitmap ;
private int x=20,y=20;int width,height;
cShapeParent MyShapes;
cTarget MyTargetShapes;
Context context;
int counter=0;
// sound
private SoundPool soundPool;
private int soundID;
boolean loaded = false;
public BallView(Context InContext,int w,int h) {
super(InContext);
context=InContext;
int counter=0;
int Page=0;
width=w;
height=h;
getHolder().addCallback(this);
setFocusable(true);
MyShapes=new cShapeParent(context,w,h);
MyTargetShapes= new cTarget(context,w,h);
MyShapes.SetTargets( MyTargetShapes);
// load in bitmaps
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
bitmap =BitmapFactory.decodeResource(getResources(), R.drawable.ball_green);
canvas.drawColor(Color.BLUE);//To make background
// canvas.drawBitmap(bitmap,x-(bitmap.getWidth()/2),y-(bitmap.getHeight()/2),null);
// See if we shoyld drag it
for(int i=MyShapes.Amount-1; i>=0; i--)
{
if (MyShapes.Intersect(i,x,y))
{
// see if we can drag it
if (MyShapes.getDragFlag(i)==false)
break;
// yes drag this image
MyShapes.SetCenter(i, x, y);
// if the target was found
// make it so we can no loner drag it
if (MyShapes.CheckTarget(i))
{
MyShapes.SetDrag(i,false);
MyShapes.SetToTarget(i);
if (++counter>2)
DisplayNextScreen();
}
break;
}
}
// Draw target shapes
// NOTE: draw these first so they are on the bottom
for(int i=0; i<MyShapes.Amount;i++)
{
int x=MyTargetShapes.GetX(i);
int y=MyTargetShapes.GetY(i);
int w=MyTargetShapes.GetW(i);
int h=MyTargetShapes.GetH(i);
Rect br=new Rect(x, y,w+x, h+y);
Bitmap m= MyTargetShapes.MyImages[i];
canvas.drawBitmap(m, null, br, null);
}
// Draw shapes that can be dragged
for(int i=0; i<MyShapes.Amount;i++)
{
int x=MyShapes.GetX(i);
int y=MyShapes.GetY(i);
int w=MyShapes.GetW(i);
int h=MyShapes.GetH(i);
Rect br=new Rect(x, y, x+w,y+h);
Bitmap m= MyShapes.MyImages[i];
canvas.drawBitmap(m, null, br, null);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
x=(int)event.getX();
y=(int)event.getY();
if(x<25)
x=25;
if(x> width)
x=width;
if(y <25)
y=25;
if(y > height)
y=height;
updateBall();
return true;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
private void updateBall() {
Canvas canvas = null;
try {
canvas = getHolder().lockCanvas(null);
synchronized (getHolder()) {
this.onDraw(canvas);
}
}
finally {
if (canvas != null) {
getHolder().unlockCanvasAndPost(canvas);
}
}
}
void DisplayNextScreen()
{
/////////////////////////////////////
// call up dialog
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.custom);
dialog.setTitle("Title...");
// set the custom dialog components - text, image and button
TextView text = (TextView) dialog.findViewById(R.id.text);
text.setText("Android custom dialog example!");
ImageView image = (ImageView) dialog.findViewById(R.id.image);
image.setImageResource(R.drawable.ic_launcher);
Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
// if button is clicked, close the custom dialog
dialogButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
MyTargetShapes.SetUp(1);
MyShapes.SetUp(1);
MyShapes.SetTargets( MyTargetShapes);
counter =0;
}
});
dialog.show();
} // end methed
void StartSound(int soundID)
{
AudioManager audioManager = (AudioManager) context.getSystemService("audio");
float actualVolume = (float) audioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
float maxVolume = (float) audioManager
.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
float volume = actualVolume/maxVolume;
// Is the sound loaded already?
soundPool.play(soundID, volume, volume, 1, 0, 1f);
// Log.e("Test", "Playe");
}
} // end class