android bitmap传入canvas 画的东西看不见

android bitmap传入canvas 画的东西看不见

android中，我将一个bitmap传入canvas中，并且在上面画了一个圆，然后再将bitmap保存,保存出来的图片上面的确有个圆，但是我在模拟器上看不到圆，要怎么弄呢？

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public class GameView extends View {     public GameView(Context context) {         super(context);     }     @Override     protected void onDraw(Canvas canvas) {         super.onDraw(canvas);                   Bitmap bmp = Bitmap.createBitmap(480, 800, Config.ARGB_8888);         canvas = new Canvas(bmp);         Paint myPaint = new Paint();         myPaint.setColor(Color.RED);         myPaint.setAntiAlias(true);         canvas.drawCircle(50, 50, 50, myPaint);                   File file = new File("/sdcard/test/");         if(!file.exists()){             file.mkdirs();         }         try {             FileOutputStream fos = new FileOutputStream(file.getPath() + "/1.jpg");             bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);             fos.close();         } catch (Exception e) {             Log.e("Error", e.toString());         }     } }

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• 平凡简单 3年前
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  Bitmap bmp = Bitmap.createBitmap(480, 800, Config.ARGB_8888);         // canvas = new Canvas(bmp);         Paint myPaint = new Paint();         myPaint.setColor(Color.RED);         myPaint.setAntiAlias(true);         Canvas c = new Canvas(bmp);         c.drawCircle(50, 50, 50, myPaint);         Matrix m = new Matrix();         canvas.drawBitmap(bmp, m, myPaint);

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