I have a problem that I implemented a functionality in which we draw bitmaps on a canvas and We can Dragging and dropping the same in whole canvas area, I refer the Drag and Drop Sample Code from the API Demos which is working fine but when we implement same functionality in our code then it returns ArrrayOutOfBoundsException frequently means some times it is working fine and some times returns an error after touching the Canvas. Please suggest me a right solution for the problem if you find any bug in the source.
Error Stack:
02-27 11:41:16.046: E/AndroidRuntime(5413): FATAL EXCEPTION: main
02-27 11:41:16.046: E/AndroidRuntime(5413): java.lang.ArrayIndexOutOfBoundsException
02-27 11:41:16.046: E/AndroidRuntime(5413): at com.TestFace.FaceDetect.DrawView.onTouchEvent(DrawView.java:132)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.view.View.dispatchTouchEvent(View.java:3766)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
02-27 11:41:16.046: E/AndroidRuntime(5413): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1676)
02-27 11:41:16.046: E/AndroidRuntime(5413): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1112)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.app.Activity.dispatchTouchEvent(Activity.java:2086)
02-27 11:41:16.046: E/AndroidRuntime(5413): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1660)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.view.ViewRoot.handleMessage(ViewRoot.java:1785)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.os.Handler.dispatchMessage(Handler.java:99)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.os.Looper.loop(Looper.java:123)
02-27 11:41:16.046: E/AndroidRuntime(5413): at android.app.ActivityThread.main(ActivityThread.java:4627)
02-27 11:41:16.046: E/AndroidRuntime(5413): at java.lang.reflect.Method.invokeNative(Native Method)
02-27 11:41:16.046: E/AndroidRuntime(5413): at java.lang.reflect.Method.invoke(Method.java:521)
02-27 11:41:16.046: E/AndroidRuntime(5413): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
02-27 11:41:16.046: E/AndroidRuntime(5413): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
02-27 11:41:16.046: E/AndroidRuntime(5413): at dalvik.system.NativeStart.main(Native Method)
DrawView.java:
package com.TestFace.FaceDetect;
import java.io.IOException;
import java.net.MalformedURLException;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.MotionEvent;
import android.view.View;
import com.TestFace.FaceDetect.Util.ResultPack;
public class DrawView extends View {
private ColorBall[] colorballs = new ColorBall[3]; // array that holds the balls
private int balID = 0; // variable to know what ball is being dragged
ResultPack result = ResultPack.getSingletonObject();
Bitmap myBitmap,myBitmap_Circle;
int width, height;
public DrawView(Context context) {
super(context);
setFocusable(true); //necessary for getting the touch events
// setting the start point for the balls
Point point1 = new Point();
point1.x = (int)result.getEyeLeftX()+50;
point1.y = (int)result.getEyeLeftY()+25;
Point point2 = new Point();
point2.x = (int)result.getEyeRightX()+50;
point2.y = (int)result.getEyeRightY()+25;
Point point3 = new Point();
point3.x = (int)result.getMouthCenterX()+50;
point3.y = (int)result.getMouthCenterY()+25;
Drawable d=null;
try {
d = drawable_from_url(result.getImgUrl(), "Image Url");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
myBitmap=((BitmapDrawable)d).getBitmap();
myBitmap_Circle = BitmapFactory.decodeResource(getResources(), R.drawable.circle1);
// declare each ball with the ColorBall class
colorballs[0] = new ColorBall(context,myBitmap_Circle, point1);
colorballs[1] = new ColorBall(context,myBitmap_Circle, point2);
colorballs[2] = new ColorBall(context,myBitmap_Circle, point3);
width=myBitmap.getWidth();
height=myBitmap.getHeight();
}
Drawable drawable_from_url(String url, String src_name) throws java.net.MalformedURLException, java.io.IOException
{
return Drawable.createFromStream(((java.io.InputStream)new java.net.URL(url).getContent()), src_name);
}
// the method that draws the balls
@Override protected void onDraw(Canvas canvas) {
//canvas.drawColor(0xFFCCCCCC); //if you want another background color
canvas.drawBitmap(myBitmap, 0,0, null);
//draw the balls on the canvas
for (ColorBall ball : colorballs) {
canvas.drawBitmap(ball.getBitmap(), ball.getX(), ball.getY(), null);
}
}
// events when touching the screen
public boolean onTouchEvent(MotionEvent event) {
int eventaction = event.getAction();
int X = (int)event.getX();
int Y = (int)event.getY();
switch (eventaction ) {
case MotionEvent.ACTION_DOWN: // touch down so check if the finger is on a ball
balID = 0;
for (int i=0;i<colorballs.length;i++) {
// check if inside the bounds of the ball (circle)
// get the center for the ball
int centerX = colorballs[i].getX() + 25;
int centerY = colorballs[i].getY() + 25;
// calculate the radius from the touch to the center of the ball
double radCircle = Math.sqrt( (double) (((centerX-X)*(centerX-X)) + (centerY-Y)*(centerY-Y)));
System.out.println("The Rad Circle:"+radCircle);
// if the radius is smaller then 23 (radius of a ball is 22), then it must be on the ball
if (radCircle < 23){
balID = colorballs[i].getID();
}
// check all the bounds of the ball (square)
//if (X > ball.getX() && X < ball.getX()+50 && Y > ball.getY() && Y < ball.getY()+50){
// balID = ball.getID();
// break;
//}
}
break;
case MotionEvent.ACTION_MOVE: // touch drag with the ball
// move the balls the same as the finger
if (balID > 0) {
colorballs[balID-1].setX(X-25);
colorballs[balID-1].setY(Y-25);
}
break;
case MotionEvent.ACTION_UP:
// touch drop - just do things here after dropping
break;
}
// redraw the canvas
invalidate();
return true;
}
}
ColorBall.java:
package com.TestFace.FaceDetect;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Point;
public class ColorBall {
private Bitmap img; // the image of the ball
private int coordX = 0; // the x coordinate at the canvas
private int coordY = 0; // the y coordinate at the canvas
private int id; // gives every ball his own id, for now not necessary
private static int count = 1;
private boolean goRight = true;
private boolean goDown = true;
public ColorBall(Context context, Bitmap drawable) {
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
//img = BitmapFactory.decodeResource(context.getResources(), drawable);
img = drawable;
id=count;
count++;
}
public ColorBall(Context context, Bitmap drawable, Point point) {
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
//img = BitmapFactory.decodeResource(context.getResources(), drawable);
img = drawable;
id=count;
count++;
coordX= point.x;
coordY = point.y;
}
public static int getCount() {
return count;
}
void setX(int newValue) {
coordX = newValue;
}
public int getX() {
return coordX;
}
void setY(int newValue) {
coordY = newValue;
}
public int getY() {
return coordY;
}
public int getID() {
return id;
}
public Bitmap getBitmap() {
return img;
}
public void moveBall(int goX, int goY) {
// check the borders, and set the direction if a border has reached
if (coordX > 270){
goRight = false;
}
if (coordX < 0){
goRight = true;
}
if (coordY > 400){
goDown = false;
}
if (coordY < 0){
goDown = true;
}
// move the x and y
if (goRight){
coordX += goX;
}else
{
coordX -= goX;
}
if (goDown){
coordY += goY;
}else
{
coordY -= goY;
}
}
}
The problem is that you generate id for your
ColorBalland then try to use this id as an index ofcolorballsarray:and:
Which evidently is wrong. If it is id of the
ColorBallthat you want to referColorBallobjects by, then consider using other types of collections to hold a list ofColorBallobjects, i.e.HashMap<Integer, ColorBall>, otherwise use the index of element within the array to refer to certainColorBallobject.