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POdraw a line in a LinearLayout extended class
 

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  1. POdraw a line in a LinearLayout extended class
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    <p>I have this class: My problem:</p> <pre><code>public class Example extends Activity implements OnClickListener{ DrawView view1; Canvas canvas = new Canvas(); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); view1 = new DrawView(this); setContentView(view1); } @Override public boolean onTouchEvent(MotionEvent event) { int x = (int) event.getX(); int y = (int) event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: view1.setFirstCoord(x, y); break; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_UP: view1.setSecondCoord(x, y); view1.dispatchDraw(canvas); break; } return true; } public class DrawView extends LinearLayout { private Paint paint = new Paint(); public int x1, x2; public int y1, y2; public DrawView(Context c){ super(c); LayoutInflater inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); addView(inflater.inflate(R.layout.union, null)); x1 = 0; x2 = 0; y1 = 0; y2 = 0; paint.setColor(Color.BLACK); paint.setAntiAlias(true); paint.setDither(true); paint.setStyle(Paint.Style.STROKE); paint.setStrokeJoin(Paint.Join.ROUND); paint.setStrokeWidth(10); } @Override public void dispatchDraw(Canvas canvas) { super.dispatchDraw(canvas); canvas.drawLine(0, 50, 900,2000 , paint);//WORKS canvas.drawLine((int) x1, (int) y1,(int) x2,(int) y2, paint);//NO WORKS } public void setFirstCoord(int e, int f){ x1 = e; y1 = f; } public void setSecondCoord(int e, int f){ x2 = e; y2 = f; } } } </code></pre> <p>When the next line is executed I see the "example" line on the screem:</p> <pre><code>canvas.drawLine(0, 50, 900,2000 , paint); </code></pre> <p>But when the following line "is executed" is not painted any straight line. Why???</p> <pre><code>canvas.drawLine((int) x1, (int) y1,(int) x2,(int) y2, paint); </code></pre> <p>I also tried with:</p> <pre><code>canvas.drawLine(x1, y1, x2, y2, paint); </code></pre> <p>But, obviously, the results are the same.</p> <p>I also tried with executed a onDraw() method but any line is painted because onDraw paint under de "UI" (under the content of the layout .xml file)</p> <p>I hope found somebody who can help me. I think the solution can very easy but I'm going crazy trying things without finding the solution.</p> <p>Thanks!!!</p> <p>The solution:</p> <pre><code>public class Example extends Activity implements OnClickListener{ DrawView view1; Canvas canvas = new Canvas(); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); view1 = new DrawView(this); setContentView(view1); view1.setOnClickListener(this); } public class DrawView extends LinearLayout { private Paint paint = new Paint(); public int x1, x2; public int y1, y2; public DrawView(Context c){ super(c); LayoutInflater inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); addView(inflater.inflate(R.layout.union, null)); x1 = 0; x2 = 0; y1 = 0; y2 = 0; paint.setColor(Color.BLACK); paint.setAntiAlias(true); paint.setDither(true); paint.setStyle(Paint.Style.STROKE); paint.setStrokeJoin(Paint.Join.ROUND); paint.setStrokeWidth(10); } public boolean onTouchEvent(MotionEvent event) { int x = (int) event.getX(); int y = (int) event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: view1.setFirstCoord(x, y); break; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_UP: view1.setSecondCoord(x, y); view1.onDraw(canvas); view1.postInvalidate(); break; } return true; } public void setFirstCoord(int e, int f){ x1 = e; y1 = f; } public void setSecondCoord(int e, int f){ x2 = e; y2 = f; } public void onDraw(Canvas canvas){ canvas.drawLine((int) x1, (int) y1,(int) x2,(int) y2, paint); } } } </code></pre> <p>THANKS AGAIN for your help and your attention. It's a pleasure!!!</p>
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    1. COI noticed that your are implementing an OnClickListener, understand that any OnClickListener consumes a touch event preventing it from reaching your Activity's `onTouchEvent()` method. Have you verified that `onTouchEvent()` is called?
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