我正在做一些项目，我必须根据用户的触摸来为图像制作动画，但问题是我没有得到所有的接触点，因此我没有得到流畅的动画。我正在使用 Android 平板电脑 os 4.0.3。
public class DrawView extends View implements OnTouchListener {
private static final String TAG = "DrawView";
List<Points> points = new ArrayList<Points>();
Paint paint = new Paint();
Button button = null;
int movement = 0;
int[] imageIds = {R.drawable.zero,R.drawable.one,R.drawable.two,R.drawable.three,R.drawable.four,
R.drawable.five,R.drawable.six,R.drawable.seven,R.drawable.eight,R.drawable.ninie,R.drawable.ten,
R.drawable.eleven,R.drawable.twelve,R.drawable.thirteen,R.drawable.fourteen,R.drawable.fifteen,
R.drawable.sixteen,R.drawable.seventeen,R.drawable.eighteen,R.drawable.ninteen,R.drawable.twenty,
R.drawable.twentyone,R.drawable.twentytwo,R.drawable.twentythree,R.drawable.twentyfour,
R.drawable.twentyfive,R.drawable.twentysix,R.drawable.twentyseven,R.drawable.twentyeight,
R.drawable.twentynine,R.drawable.thirty,R.drawable.thirtyone,R.drawable.thirtytwo,
R.drawable.thirtythree,R.drawable.thirtyfour,R.drawable.thirtyfive,R.drawable.thirtysix,
R.drawable.thirtyseven,R.drawable.thirtyeight,R.drawable.thirtynine,R.drawable.fortyone,
R.drawable.fortytwo,R.drawable.fortytwo,R.drawable.fortyfour,R.drawable.fortyfive,
R.drawable.fortysix,R.drawable.fortyseven,R.drawable.fortyeight,R.drawable.fortynine,
R.drawable.fifty,R.drawable.fiftyone,R.drawable.fiftyone,R.drawable.fiftythree,R.drawable.fiftyfour,
R.drawable.fiftyfive,R.drawable.fiftysix,R.drawable.fiftyseven,R.drawable.fiftyeight,
R.drawable.fiftynine,R.drawable.sixty,R.drawable.sixtyone,R.drawable.sixtytwo,
R.drawable.sixtythree,R.drawable.sixtyfour,R.drawable.sixtyfive,R.drawable.sixtysix,
R.drawable.sixtyseven,R.drawable.sixtyeight,R.drawable.sixtynine,R.drawable.seventy,
R.drawable.seventyone,R.drawable.seventytwo,R.drawable.seventythree,R.drawable.seventyfour,
R.drawable.seventyfive,R.drawable.seventysix,R.drawable.seventyseven,R.drawable.seventyeight,
R.drawable.seventynine,R.drawable.eighty,R.drawable.eightyone,R.drawable.eightytwo,R.drawable.thirtythree,
R.drawable.eightyfour,R.drawable.eightyfive,R.drawable.eightysix,R.drawable.eightyseven,
R.drawable.seventyeight,R.drawable.eightynine,R.drawable.ninty,R.drawable.nintyone,
R.drawable.nintytwo,R.drawable.nintythree,R.drawable.nintyfour,R.drawable.nintyfive,
R.drawable.nintysix,R.drawable.nintyseven,R.drawable.nintyeight,R.drawable.nintynine,
R.drawable.hundred
};
int touchPoint=0,currentImage=0;
float previousX = 0, starting = 0, difference = 0, remaining=0;
RelativeLayout relativeLayout;
Boolean update = false;
int changeImageFrequency = 4;
ImageView image;
public DrawView(Context context) {
super(context);
setFocusable(true);
setFocusableInTouchMode(true);
this.setOnTouchListener(this);
}
@SuppressLint("DrawAllocation")
@TargetApi(11)
@Override
public void onDraw(Canvas canvas) {
Log.i("testing", "i am in draw");
if (movement==0) {
Bitmap bimap = BitmapFactory.decodeResource(getResources(), imageIds[currentImage]);
canvas.drawBitmap(bimap, 0, 0,null);
invalidate();
}
else if (movement==1) {
if (currentImage+changeImageFrequency<100) {
currentImage+=changeImageFrequency;
Bitmap bimap = BitmapFactory.decodeResource(getResources(), imageIds[currentImage]);
canvas.drawBitmap(bimap, 0, 0,null);
invalidate();
}
else {
Bitmap bimap = BitmapFactory.decodeResource(getResources(), imageIds[currentImage]);
canvas.drawBitmap(bimap, 0, 0,null);
currentImage=0;
}
movement=0;
invalidate();
}
else if (movement==2) {
if (currentImage-changeImageFrequency>=0) {
currentImage-=changeImageFrequency;
Bitmap bimap = BitmapFactory.decodeResource(getResources(), imageIds[currentImage]);
canvas.drawBitmap(bimap, 0, 0,null);
invalidate();
}
else {
Bitmap bimap = BitmapFactory.decodeResource(getResources(), imageIds[currentImage]);
canvas.drawBitmap(bimap, 0, 0,null);
currentImage=99;
}
movement=0;
invalidate();
}
}
public boolean onTouch(View view, MotionEvent event) {
// TODO Auto-generated method stub
int action = event.getAction();
switch(action) {
case MotionEvent.ACTION_DOWN:
starting = event.getX();
invalidate();
break;
case MotionEvent.ACTION_MOVE:
difference = event.getX()-starting;
if (difference>0)
movement = 1;
else if (difference<0)
movement = 2;
invalidate();
break;
case MotionEvent.ACTION_UP:
invalidate();
break;
}
return true;
}