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POHow to add an OnClick event for an Android custom View
 

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    <p>I have two images moving across the screen, one is a ball and one is a man. What I want to happen is when the user touches the image of the man, the ball drops. </p> <p>My problem is I cannot seem to add an onclick/ontouch event and get it to work.</p> <p>I'm not implementing it properly, can anyone help please?</p> <p>I have included the 3 classes below. Greg is the man and the ball is named ball :)</p> <p>TestAnimationActivity.java</p> <pre><code> package com.test.firstAnimation; import android.app.Activity; import android.os.Bundle; public class TestAnimationActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new MyAnimationView(this)); } } </code></pre> <p>Sprite.java</p> <pre><code>package com.test.firstAnimation; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.view.View; import android.view.View.OnClickListener; import android.widget.Toast; public class Sprite extends View implements OnClickListener{ private static int gregCoordX = 410; // the x coordinate at the canvas for greg private Bitmap img; // the image of Greg private Bitmap img2; // the image of pointer private static int gregCoordY = 125; // the y coordinate at the canvas for greg private static int pointCoordX = 10; private static int pointCoordY = 10; private static int count = 1; private static int ballSpeed = 25; private static boolean goingRight = false; private static boolean goingLeft = true; private static boolean pointerGoingRight = false; private static boolean pointerGoingLeft = true; public Sprite(Context context, int drawable) { super(context); BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inJustDecodeBounds = true; img = BitmapFactory.decodeResource(context.getResources(), drawable); img2 = (BitmapFactory.decodeResource(context.getResources(), drawable)); count++; } public static int getCount() { return count; } void setX(int newValue) { gregCoordX = newValue; } public static int getX() { return gregCoordX; } public static int getY() { return gregCoordY; } public static int getBX() { return pointCoordX; } public static int getBY() { return pointCoordY; } public Bitmap getBitmap() { return img; } public Bitmap getImg2() { return img2; } public static void dropBall() { pointCoordY++; } public static void moveBall(int x) { // check the borders //if more than ten go right //if ten go left //if more than 250 go left if (x &lt;= 10 &amp;&amp; pointerGoingLeft) { pointCoordX = pointCoordX + ballSpeed; pointerGoingRight = true; pointerGoingLeft = false; } else if (x &gt;= 410 &amp;&amp; pointerGoingRight) { pointCoordX = pointCoordX - ballSpeed; pointerGoingLeft = true; pointerGoingRight = false; } else if (pointerGoingRight) pointCoordX = pointCoordX + ballSpeed; else pointCoordX = pointCoordX - ballSpeed; if(MyAnimationView.ballDropping == true) { while (pointCoordY&lt;gregCoordY) dropBall(); } } public static void moveGreg(int x) { if (x &lt;= 10 &amp;&amp; goingLeft) { gregCoordX = gregCoordX + count; goingRight = true; goingLeft = false; } else if (x &gt;= 410 &amp;&amp; goingRight) { gregCoordX = gregCoordX - count; goingLeft = true; goingRight = false; } else if (goingRight) gregCoordX = gregCoordX + count; else gregCoordX = gregCoordX - count; } @Override public void onClick(View arg0) { dropBall(); } } </code></pre> <p>MyAnimationView.java</p> <pre><code>package com.test.firstAnimation; import android.content.Context; import android.graphics.Canvas; import android.view.View; public class MyAnimationView extends View{ private Sprite greg; private Sprite ball; private int xCoOr; private int ballXCoOr; public static boolean ballDropping; public MyAnimationView(Context context) { super(context); ballDropping = false; greg = new Sprite(context,R.drawable.greg); ball = new Sprite(context, R.drawable.ball); OnClickListener gregClicked = new OnClickListener() { public void onClick(View v) { ballDropping = true; } }; greg.setOnClickListener(gregClicked); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(0xFFFFFFFF); //white background ballXCoOr = Sprite.getBX(); xCoOr = Sprite.getX(); Sprite.moveGreg(xCoOr); //move ball left or right depending Sprite.moveBall(ballXCoOr); if(ballDropping == true) { Sprite.dropBall(); } canvas.drawBitmap(greg.getBitmap(), xCoOr, Sprite.getY(), null); canvas.drawBitmap(ball.getBitmap(), ballXCoOr, Sprite.getBY(), null); invalidate(); } } </code></pre> <p>Thanks in advance, I've been stuck for days!</p> <p>Ben</p>
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    1. COI apologise for the poor formatting, this is my first post :)
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    2. COI don't think your code works because the Sprite views aren't subviews of MyAnimationView. The onClick listener doesn't fire because the Views are never used - you simply read out their Bitmaps and draw those in onDraw. I'd post this as an answer but it is the problem, not the solution.
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      1. POHow to add an OnClick event for an Android custom View
      1. USDavid Snabel-Caunt
 

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