Create a MytView class
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| public class MyView extends View {
public MyView(Context context) {//for program use
super(context);
init();
}
public MyView(Context context, AttributeSet attrs) {//for XML use AttributeSet is the value get from the XML
super(context, attrs);
init();
}
}
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Now the View have nothing.
Overide onDraw in MYView class to show something
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| protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Draw something here
}
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remark:in Rect and RectF,the number is coordinate.
Some Draw command
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| //First set the paint, paint define the draw style
paint.setColor(Color.BLUE);
paint.setTextSize(50);
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Draw Text
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| //Text
canvas.drawText("Hello", 0, 70, paint);
paint.setStyle(Paint.Style.STROKE);
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draw Line
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| //draw a Line
canvas.drawLine(0, 60, 100, 60, paint);
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draw Rectangle
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| canvas.drawRect(10, 70, 90, 120, paint);
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draw Round Rectangle
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| RectF rf = new RectF(10, 130, 90, 160);
canvas.drawRoundRect(rf, 40, 40, paint);
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draw Bitmap
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| Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.p_04);
//create the 縮略圖
Bitmap bitmap1 = ThumbnailUtils.extractThumbnail(bitmap, bitmap.getWidth() / 6, bitmap.getHeight() / 6);
canvas.drawBitmap(bitmap1,10,400,paint);
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