I'm trying to draw a 2D Rectangle on my Android project. It's working great, but the only problem is that I'm using a Background image for my project. The 2D Rectangle won't allow the Background image to show. For example, if I draw the rectangle before showing the Background image, the Background will hide the rectangle. It'll do the same if I show the Background first and then draw the rectangle, only this time the rectangle will hide the Background image completely.
public class DrawView extends View
{
Paint paint = new Paint();
public DrawView(Context context)
{
super(context);
}
#Override
public void onDraw(Canvas canvas)
{
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStrokeWidth(3);
canvas.drawRect(30, 30, 80, 80, paint);
paint.setColor(Color.CYAN);
canvas.drawRect(33, 60, 77, 77, paint);
paint.setColor(Color.YELLOW);
canvas.drawRect(33, 33, 77, 60, paint);
}
}
On the main form:
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
DrawView drawview = new DrawView(this);
setContentView(drawview);
setContentView(R.layout.activity_login);
}
Try to add super.onDraw() into your onDraw() override, to make view's onDraw() execute before you start draw custom elements on it:
#Override
public void onDraw(Canvas canvas)
{
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStrokeWidth(3);
canvas.drawRect(30, 30, 80, 80, paint);
paint.setColor(Color.CYAN);
canvas.drawRect(33, 60, 77, 77, paint);
paint.setColor(Color.YELLOW);
canvas.drawRect(33, 33, 77, 60, paint);
}
I've figured it out. All that's left is changing the rectangle's location.
Add the following:
addContentView(drawview, new LayoutParams(Width, Height));
And remove the setContentView() command.
Related
I am new in android. I am trying to draw this image(match statistic)
and fill the image with color with 10% to 100% . I tried this much and this is image
this is the code
public class DrawView extends View {
Paint paint = new Paint();
public DrawView(Context context) {
super(context);
}
#Override
public void onDraw(Canvas canvas) {
paint.setColor(Color.BLACK);
paint.setStrokeWidth(3);
canvas.drawRect(30, 30, 100, 100, paint);
paint.setStrokeWidth(0);
paint.setColor(Color.GRAY);
canvas.drawRect(33, 60, 97, 97, paint);
paint.setColor(Color.WHITE);
canvas.drawRect(33, 33, 97, 60, paint);
}
Any Suggestion will be much helpful for me.
Thanks in advance.
I would prepare two images - fully filled and not filled (only stroke). Having that, load them as two Bitmap objects and then draw like that:
float fillProgress = 0.1f; // let's say image is 10% filled
canvas.drawBitmap(onlyStroke, 0f, 0f, null); // draw just stroke first
canvas.save();
canvas.clipRect(
0f, // left
getHeight() - fillProgress * getHeight(), // top
getWidth(), // right
getHeight() // bottom
);
canvas.drawBitmap(filled, 0f, 0f, null); // region of filled image specified by clipRect will now be drawn on top of onlyStroke image
canvas.restore();
Using two images, outlined and filled e.g. below.
The code above does the following:
draw outline.
apply clip (crop) area.
draw filled shape with crop applied.
remove clip, image as desired.
Applying different clip sizes, you can get the % of fill you require. e.g.
I want to draw a view like the picture above，but I'm stuck in how to draw the outline, I can only draw a circle, I cannot add two ears ，so someone can help me, I also want to draw a progress.
Draw line it just
#Override
public void onDraw(Canvas canvas) {
//canvas.drawLine(sx, sy, fx, fy, paint);
canvas.drawLine(20, 0, 0, 20, paint);
}
If you are asking how to draw an arc, then you really need to use the Path.
or this code:
canvas.drawColor(Color.CYAN);
Paint p = new Paint();
p.setAntiAlias(true);
p.setColor(Color.RED);
p.setStyle(Paint.Style.STROKE);
p.setStrokeWidth(5);
RectF rectF = new RectF(50, 20, 100, 80);
canvas.drawOval(rectF, p);
p.setColor(Color.BLACK);
canvas.drawArc (rectF, 90, 45, true, p);
I want to draw two colored circle on canvas. Everything is right but the circle isn't smooth.
This is the effect:
And this is code:
private void drawCircle(Canvas c)
{
RectF oval = new RectF(20, 20, 100, 100);
c.drawArc(oval, -90, 180, false, getPaintWithColor(R.color.background));
c.drawArc(oval, 90, 180, false, getPaintWithColor(R.color.font_grey));
}
private Paint getPaintWithColor(int colorId){
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setDither(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(4);
paint.setColor(getResources().getColor(colorId));
return paint;
}
paint.setFlags(Paint.ANTI_ALIAS_FLAG)
See in Can I draw with antialiasing on canvas?
Hello i added rectangle in my canvas now i want to add textview or some other view in that rectangle.Suggest me some tutorial also. Thanks in advance
public class DrawView extends View {
public DrawView(Context context) {
super(context);
}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Rect rect = new Rect();
rect.set(20 ,10 ,canvas.getWidth()/2, canvas.getHeight()/2);
Paint paint = new Paint();
paint.setColor(Color.GREEN);
canvas.drawRect(rect, paint);
}
}
You can draw text on your canvas.
Paint mpaint= new Paint();
mpaint.setColor(Color.RED);//set red color for rectangle
mpaint.setStyle(Paint.Style.FILL);//mpaint will fill the rectangle
Paint paint2 = new Paint();
paint2.setColor(Color.GREEN);//green color for text
paint2.setTextSize(30f);//set text size. you can change the stroke width also
#Override
protected void onDraw(Canvas canvas)
{
canvas.drawRect(30, 30, 600, 600, mpaint);
canvas.drawText("hello", 150, 150, paint2);//change x and y according to your needs
}
Resulting snapshot on samsung galaxy s3
Adding a View of any kind is out of question here since you are simply drawing on a canvas. But Canvas.drawText(...) might be exactly what you are looking for.
I want to draw an oval shape around the text on Canvas, I am displaying the 3 texts on Canvas using drawwText() method.
Now when I click on a particular text, I need to draw an oval around that text and again when we click on another text, the oval shape should appear on the clicked text. For this give me some code suggestions.Thanks in advance
use drawOval method().. here is the signature of the method..
public void drawOval (RectF oval, Paint paint)
RectF is class for drawing rectangle...whose constructor is defined as following...
RectF(x,y,x+width,y+height);
you can make its object as follows
RectF rect = new RectF(x,y,x+width,y+height);...
now pass this object in drawOval method....
canvas.drawOval(rect,paint);
for resolution (480 x 800)
in onCreate()
setContentView(new SampleView(this));
create class
private static class SampleView extends View {
// CONSTRUCTOR
public SampleView(Context context) {
super(context);
setFocusable(true);
}
#SuppressLint("DrawAllocation")
#Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
//1
Paint paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.GRAY);
RectF oval1 = new RectF(0, 0, 250,250);
Paint p1 = new Paint();
p1.setColor(Color.BLACK);
canvas.drawText("Parent", 30, 50, p1);
canvas.drawOval(oval1, paint);
//2
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.BLUE);
RectF oval2 = new RectF(50, 50, 150, 150);
Paint p2 = new Paint();
p2.setColor(Color.GREEN);
canvas.drawText("Child", 75, 75, p2);
canvas.drawOval(oval2, paint);
}
}