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PODraw with a Canvas on a view, but nothing painted
 

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  1. PODraw with a Canvas on a view, but nothing painted
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    <p>I'm a beginner. I got a problem. This is an example about canvas on a view. </p> <p>A circle and text on it are supposed to be seen.</p> <p>(<a href="http://goo.gl/6ZPvQ" rel="nofollow">http://goo.gl/6ZPvQ</a>) My reputation isn't enough to get a picture.</p> <p>But Nothing happened.</p> <p>This is the view I draw canvas on. </p> <pre><code>public class TestCanvasActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new MyGraphics(this)); } } class MyGraphics extends View { private Paint cPaint,tPaint; private Path circle; private String text; @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); cPaint = new Paint(Color.GRAY); tPaint = new Paint(Color.BLACK); circle = new Path(); text = "Welcome to Android!!"; circle.addCircle(150, 150, 100, Direction.CW); canvas.drawPath(circle, cPaint); canvas.drawTextOnPath(text, circle, 0, 20, tPaint); } public MyGraphics(Context context) { super(context); // TODO Auto-generated constructor stub setBackgroundColor(R.drawable.background); } } </code></pre> <p>This is the background image code!!</p> <p>background.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;shape xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;gradient android:startColor="#FFFFFF" android:endColor="#808080" android:angle="270" /&gt; &lt;/shape&gt; </code></pre> <p>Thank you!!</p> <p>I Made a low level mistake. I change <strong>cPaint = new Paint(Color.GRAY)</strong> to the next two line. It works!! </p> <pre><code> cPaint = new Paint(); cPaint.setColor(Color.WHITE); </code></pre> <p>Thank you all the same.</p>
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      1. PODraw with a Canvas on a view, but nothing painted
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    1. COWhenever you draw, it should be drawing on a bitmap (i believe), and then you would call `layout.setImageBitmap(bitmap);` to actually update your view.
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      1. PODraw with a Canvas on a view, but nothing painted
      1. USJakar
    2. COYou are right!! But I inherit MyGraphics from class View. It will draw canvas on a bitmap itself!!
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      1. USSam
    3. COOkay. I have little experience with it, so I wasn't sure.
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      1. USJakar
 

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