Develop Reference

Background with a cut in on edge / Custom background shape

I have to create ViewPager with Fragments, and the main problem is that, each Fragment's background needs to have a cut in on edge in background. The cut in should expand while dragging. Do you have any ideas how to do it?
It should look like that:

U can refer the Flowing Drawer in the git
Link :https://github.com/mxn21/FlowingDrawer
In this sample they are using a "LeftDrawerLayout" a custom class to handle this effect and its property is set by FlowingView.
Use this to create a custom class.

This is prototype of my solution:
I created the custom FrameLayout and override onDraw method. This is how it's look like:
I'll add comments and description, how it's work, soon!
public class CurvedFrameLayout extends FrameLayout {
private Paint paint;
private Path path;
private int width;
private int height;
private float leftCurvePosition = 0.5f;
private float topCurvePosition = 0.5f;
private float rightCurvePosition = 0.5f;
private float bottomCurvePosition = 0.5f;
private int minimumCurve = 50;
private int maximumCurve = 100;
private int minimumLeftCurve = minimumCurve;
private int minimumTopCurve = minimumCurve;
private int minimumRightCurve = minimumCurve;
private int minimumBottomCurve = minimumCurve;
private int maximumLeftCurve = maximumCurve;
private int maximumTopCurve = maximumCurve;
private int maximumRightCurve = maximumCurve;
private int maximumBottomCurve = maximumCurve;
private float leftCurveOffset = 0f;
private float topCurveOffset = 0f;
private float rightCurveOffset = 0f;
private float bottomCurveOffset = 0f;
private int curveRadius = 150;
private float elevation = 4f;
private float cornerRadius = 50f;
private float margin = elevation;
private int color = Color.LTGRAY;
public CurvedFrameLayout(Context context) {
super(context);
init(context, null);
}
public CurvedFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public CurvedFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
if (attrs != null) {
TypedArray a = context.getTheme().obtainStyledAttributes(
attrs,
R.styleable.CurvedFrameLayout,
0, 0);
try {
leftCurvePosition = a.getFloat(R.styleable.CurvedFrameLayout_leftCurvePosition, 0.5f);
topCurvePosition = a.getFloat(R.styleable.CurvedFrameLayout_topCurvePosition, 0.5f);
rightCurvePosition = a.getFloat(R.styleable.CurvedFrameLayout_rightCurvePosition, 0.5f);
bottomCurvePosition = a.getFloat(R.styleable.CurvedFrameLayout_bottomCurvePosition, 0.5f);
minimumCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_minimumCurve, 50);
maximumCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_maximumCurve, 100);
minimumLeftCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_minimumLeftCurve, 50);
minimumTopCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_minimumTopCurve, 50);
minimumRightCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_minimumRightCurve, 50);
minimumBottomCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_minimumBottomCurve, 50);
maximumLeftCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_maximumLeftCurve, 100);
maximumTopCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_maximumTopCurve, 100);
maximumRightCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_maximumRightCurve, 100);
maximumBottomCurve = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_maximumBottomCurve, 100);
leftCurveOffset = a.getFloat(R.styleable.CurvedFrameLayout_leftCurveOffset, 0f);
topCurveOffset = a.getFloat(R.styleable.CurvedFrameLayout_topCurveOffset, 0f);
rightCurveOffset = a.getFloat(R.styleable.CurvedFrameLayout_rightCurveOffset, 0f);
bottomCurveOffset = a.getFloat(R.styleable.CurvedFrameLayout_bottomCurveOffset, 0f);
curveRadius = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_curveRadius, 150);
cornerRadius = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_cornerRadius, 50);
elevation = a.getDimensionPixelSize(R.styleable.CurvedFrameLayout_elevation, 0);
margin = elevation;
color = a.getColor(R.styleable.CurvedFrameLayout_color, Color.LTGRAY);
} finally {
a.recycle();
}
}
setWillNotDraw(false);
paint = new Paint();
//setLayerType(LAYER_TYPE_SOFTWARE, paint);
paint.setColor(color);
paint.setShadowLayer(elevation, 0f, 0f, Color.LTGRAY);
path = new Path();
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawLayout(canvas);
}
private void drawLayout(Canvas canvas) {
float cornerRadiusMargin = cornerRadius + margin;
float widthMinusMargin = width - margin;
float widthMinusMarginMinusCornerR = widthMinusMargin - cornerRadius;
float heightMinusMargin = height - margin;
float heightMinusMarginMinusCornerR = heightMinusMargin - cornerRadius;
//Top-left corner
path.reset();
path.moveTo(margin, cornerRadiusMargin);
path.quadTo(margin, margin, cornerRadiusMargin, margin);
//Top line
drawTopEdge(cornerRadiusMargin, margin, widthMinusMarginMinusCornerR, margin);
//Top-right corner
path.quadTo(widthMinusMargin, margin, widthMinusMargin, cornerRadiusMargin);
//Right line
drawRightEdge(widthMinusMargin, cornerRadiusMargin, widthMinusMargin, heightMinusMarginMinusCornerR);
//Bottom-right corner
path.quadTo(widthMinusMargin, heightMinusMargin, widthMinusMarginMinusCornerR, heightMinusMargin);
//Bottom line
path.lineTo(cornerRadiusMargin, heightMinusMargin);
//Bottom-left corner
path.quadTo(margin, heightMinusMargin, margin, heightMinusMarginMinusCornerR);
//Left line
drawLeftEdge(margin, heightMinusMarginMinusCornerR, margin, cornerRadiusMargin);
canvas.drawPath(path, paint);
canvas.clipPath(path, Region.Op.REPLACE);
}
private void drawTopEdge(float x1, float y1, float x2, float y2) {
float curveCenterX = (x1 + x2) * topCurvePosition;
float curveDeltaY = positionForOffset(minimumTopCurve, maximumTopCurve, topCurveOffset);
int curveX = curveRadius / 2;
path.lineTo(curveCenterX - curveRadius, y1);
path.rCubicTo(curveX, 0, curveX, curveDeltaY, curveRadius, curveDeltaY);
path.rCubicTo(curveX, 0, curveX, -curveDeltaY, curveRadius, -curveDeltaY);
path.lineTo(x2, y2);
}
private void drawRightEdge(float x1, float y1, float x2, float y2) {
float curveCenterY = (y1 + y2) * rightCurvePosition;
float curveDeltaX = positionForOffset(minimumRightCurve, maximumRightCurve, rightCurveOffset);
path.lineTo(x1, curveCenterY - curveRadius);
int curveY = curveRadius / 2;
path.rCubicTo(0, curveY, -curveDeltaX, curveY, -curveDeltaX, curveRadius);
path.rCubicTo(0, curveY, curveDeltaX, curveY, curveDeltaX, curveRadius);
path.lineTo(x2, y2);
}
private void drawLeftEdge(float x1, float y1, float x2, float y2) {
float curveCenterY = (y1 + y2) * leftCurvePosition;
float curveDeltaX = positionForOffset(minimumLeftCurve, maximumLeftCurve, leftCurveOffset);
path.lineTo(x1, curveCenterY + curveRadius);
int curveY = -curveRadius / 2;
path.rCubicTo(0, curveY, curveDeltaX, curveY, curveDeltaX, -curveRadius);
path.rCubicTo(0, curveY, -curveDeltaX, curveY, -curveDeltaX, -curveRadius);
path.lineTo(x2, y2);
}
private float positionForOffset(float start, float end, float offset) {
return start + (end - start) * offset;
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
width = w;
height = h;
}
public void setLeftCurveOffset(float leftCurveOffset) {
this.leftCurveOffset = leftCurveOffset;
invalidate();
}
public void setRightCurveOffset(float rightCurveOffset) {
this.rightCurveOffset = rightCurveOffset;
invalidate();
}
}
At this time, code is not perfect, but as soon as I improve this code I'll update the answer.

How to bring canvas on top of other views

I am using magnifier view for my application which is a library I got from here :
https://github.com/nomanr/android-image-magnifier
I have modified this class to extend FrameLayout (It was ImageView before) to work on my FrameLayout.
It's working well except the painted canvas view stays back of all the views which are added in that custom view.
How to bring that canvas on front of those added views?
Custom view class that i am using :
public class ImageMagnifier extends FrameLayout {
private PointF zoomPos;
private boolean zooming = false;
private Matrix matrix;
private Paint paint;
private Bitmap bitmap;
private BitmapShader shader;
private int sizeOfMagnifier = 300;
int cheight, cwidth;
Context con;
C c = C.getInstance();
public ImageMagnifier(Context context) {
super(context);
init();
con=context;
}
public ImageMagnifier(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
con=context;
}
public ImageMagnifier(Context context, AttributeSet attrs) {
super(context, attrs);
init();
con=context;
}
private void init() {
zoomPos = new PointF(0, 0);
matrix = new Matrix();
paint = new Paint();
cwidth = c.Width * 109 / 1280;
cheight = cwidth * 134 / 109;
}
public void otherTouch(int x, int y) {
if (x > c.getwidth1(28) && x < c.getwidth1(921) && y > c.getheight1(135) && y < c.getheight1(560)) {
zoomPos.x = x - 10;
zoomPos.y = y - 75;
zooming = true;
this.invalidate();
} else {
RemoveMagnifire();
}
}
public void RemoveMagnifire() {
zooming = false;
this.invalidate();
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (!zooming) {
buildDrawingCache();
} else {
bitmap = getDrawingCache();
shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP,Shader.TileMode.CLAMP);
paint.setShader(shader);
matrix.reset();
matrix.postScale(2f, 2f, zoomPos.x-10, zoomPos.y+60);
paint.getShader().setLocalMatrix(matrix);
int width = c.Width;
int height = c.Height;
float leftX = zoomPos.x - ((width * 100) / 1280);
float topY = zoomPos.y - ((height * 250) / 720);
float rightX = zoomPos.x + ((width * 100) / 1280);
float bottomY = zoomPos.y - ((height * 100) / 720);
canvas.drawRect(leftX , topY, rightX, bottomY, paint);
}
}
}

A ViewGroup draws its child Views in the dispatchDraw() method. We just need to move the magnifier drawing to after that happens.
The fix is simple. Move everything after the super call in onDraw() to after the super call in dispatchDraw().
...
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// Removed
}
#Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
if (!zooming) {
buildDrawingCache();
}
else {
bitmap = getDrawingCache();
shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
paint.setShader(shader);
matrix.reset();
matrix.postScale(2f, 2f, zoomPos.x - 10, zoomPos.y + 60);
paint.getShader().setLocalMatrix(matrix);
int width = c.Width;
int height = c.Height;
float leftX = zoomPos.x - ((width * 100) / 1280);
float topY = zoomPos.y - ((height * 250) / 720);
float rightX = zoomPos.x + ((width * 100) / 1280);
float bottomY = zoomPos.y - ((height * 100) / 720);
canvas.drawRect(leftX , topY, rightX, bottomY, paint);
}
}
...
You can just remove the onDraw() override, if you no longer need it for anything else.

Android : draw arc without resetting the previous drawn circle

I am trying to draw a circle which will represent time and after each complete circle, I want to change the color to indicate to the user that the next time unit has started and draw over the previous circle color rather than reset as shown in the example below.
I am trying to draw a circle using Draw Arc method in the following way
canvas.drawArc(mRect, 270, sweepAngle, false, fgPaint);
The sweep angle is controlled by an Object Animator :
outerCircleAnimator = ObjectAnimator.ofFloat(timeView, TimeView.SET_SWEEPWANGLE, 0, 360);
With the following code, I am able to achieve the following
The following is my View class :
public class TimeView extends View {
final protected Paint bgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
final protected Paint fgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
final protected Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private RectF mRect = new RectF();
private float sweepAngle;
private float radiusInDPI = 100;
private float radiusInPixels;
private float strokeWidthInDPI = 4;
private float stokeWidthInPixels;
private float dpi;
private int heightByTwo;
private int widthByTwo;
public TimeView(Context context) {
super(context);
init();
}
public TimeView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public TimeView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
#Override
public void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
heightByTwo = h / 2;
widthByTwo = w / 2;
mRect = new RectF(w / 2 - radiusInPixels, h / 2 - radiusInPixels, w / 2 + radiusInPixels, h / 2 + radiusInPixels);
}
private void init() {
DisplayMetrics metrics = getResources().getDisplayMetrics();
dpi = metrics.density;
radiusInPixels = dpi * radiusInDPI;
stokeWidthInPixels = dpi * strokeWidthInDPI;
bgPaint.setStrokeWidth(stokeWidthInPixels);
bgPaint.setStyle(Paint.Style.STROKE);
bgPaint.setColor(ContextCompat.getColor(getContext(), R.color.colorAccent));
fgPaint.setStrokeWidth(stokeWidthInPixels);
fgPaint.setStyle(Paint.Style.STROKE);
fgPaint.setColor(ContextCompat.getColor(getContext(), R.color.colorPrimary));
textPaint.setTextSize(24 * 3);
textPaint.setStyle(Paint.Style.STROKE);
textPaint.setColor(ContextCompat.getColor(getContext(), R.color.colorPrimary));
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// canvas.drawCircle(widthByTwo, heightByTwo, radiusInPixels, bgPaint);
canvas.drawArc(mRect, 270, sweepAngle, false, fgPaint);
}
public static final Property<TimeView, Float> SET_SWEEPWANGLE =
new Property<TimeView, Float>(Float.class, "outerCircleRadiusProgress") {
#Override
public Float get(TimeView object) {
return object.getSweepAngle();
}
#Override
public void set(TimeView object, Float value) {
object.setSweepAngle(value);
}
};
public float getSweepAngle() {
return sweepAngle;
}
public void setSweepAngle(float sweepAngle) {
Log.v("Testing", "Sweep angle is " + sweepAngle + " " + (sweepAngle + 270));
this.sweepAngle = sweepAngle;
postInvalidate();
}
public void setColor(boolean change) {
if (change) {
fgPaint.setColor(ContextCompat.getColor(getContext(), R.color.mint_green));
} else {
fgPaint.setColor(ContextCompat.getColor(getContext(), R.color.colorPrimary));
}
}
}

onDraw is used to draw on the empty canvas. It is always starting from the beginning. You'll need to save the last fgPaint and:
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (lastFgPaint != null) {
canvas.drawArc(mRect, sweepAngle, 360, false, lastFgPaint);
}
canvas.drawArc(mRect, 270, sweepAngle, false, fgPaint);
}

Customize a ProgressBar to become a Thermometer

How to customize a ProgressBar to look like a Thermometer ? with the possibility to change color.
My suggestion was to rotate the progressBar 90° to become vertical then have it overlay an image of an empty Thermometer but it's bad and messy solution.
I Think the best will be to either to extends View or ProgressBar class and customize the draw method but I have no idea how to draw Thermometer, any Help would be appreciated.

I created something like this for a project
package com.janslab.thermometer.widgets;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.Scroller;
import com.janslab.thermometer.R;
public class DummyThermometer extends View {
private Paint mInnerCirclePaint;
private Paint mOuterCirclePaint;
private Paint mFirstOuterCirclePaint;
//thermometer arc paint
private Paint mFirstOuterArcPaint;
//thermometer lines paints
private Paint mInnerLinePaint;
private Paint mOuterLinePaint;
private Paint mFirstOuterLinePaint;
//thermometer radii
private int mOuterRadius;
private int mInnerRadius;
private int mFirstOuterRadius;
//thermometer colors
private int mThermometerColor = Color.rgb(200, 115, 205);
//circles and lines variables
private float mLastCellWidth;
private int mStageHeight;
private float mCellWidth;
private float mStartCenterY; //center of first cell
private float mEndCenterY; //center of last cell
private float mStageCenterX;
private float mXOffset;
private float mYOffset;
// I 1st Cell I 2nd Cell I 3rd Cell I
private static final int NUMBER_OF_CELLS = 3; //three cells in all ie.stageHeight divided into 3 equal cells
//animation variables
private float mIncrementalTempValue;
private boolean mIsAnimating;
private Animator mAnimator;
public DummyThermometer(Context context) {
this(context, null);
}
public DummyThermometer(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DummyThermometer(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if (attrs != null) {
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Thermometer, defStyle, 0);
mThermometerColor = a.getColor(R.styleable.Thermometer_therm_color, mThermometerColor);
a.recycle();
}
init();
}
private void init() {
mInnerCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mInnerCirclePaint.setColor(mThermometerColor);
mInnerCirclePaint.setStyle(Paint.Style.FILL);
mInnerCirclePaint.setStrokeWidth(17f);
mOuterCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mOuterCirclePaint.setColor(Color.WHITE);
mOuterCirclePaint.setStyle(Paint.Style.FILL);
mOuterCirclePaint.setStrokeWidth(32f);
mFirstOuterCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mFirstOuterCirclePaint.setColor(mThermometerColor);
mFirstOuterCirclePaint.setStyle(Paint.Style.FILL);
mFirstOuterCirclePaint.setStrokeWidth(60f);
mFirstOuterArcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mFirstOuterArcPaint.setColor(mThermometerColor);
mFirstOuterArcPaint.setStyle(Paint.Style.STROKE);
mFirstOuterArcPaint.setStrokeWidth(30f);
mInnerLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mInnerLinePaint.setColor(mThermometerColor);
mInnerLinePaint.setStyle(Paint.Style.FILL);
mInnerLinePaint.setStrokeWidth(17f);
mOuterLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mOuterLinePaint.setColor(Color.WHITE);
mOuterLinePaint.setStyle(Paint.Style.FILL);
mFirstOuterLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mFirstOuterLinePaint.setColor(mThermometerColor);
mFirstOuterLinePaint.setStyle(Paint.Style.FILL);
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mStageCenterX = getWidth() / 2;
mStageHeight = getHeight();
mCellWidth = mStageHeight / NUMBER_OF_CELLS;
//center of first cell
mStartCenterY = mCellWidth / 2;
//move to 3rd cell
mLastCellWidth = (NUMBER_OF_CELLS * mCellWidth);
//center of last(3rd) cell
mEndCenterY = mLastCellWidth - (mCellWidth / 2);
// mOuterRadius is 1/4 of mCellWidth
mOuterRadius = (int) (0.25 * mCellWidth);
mInnerRadius = (int) (0.656 * mOuterRadius);
mFirstOuterRadius = (int) (1.344 * mOuterRadius);
mFirstOuterLinePaint.setStrokeWidth(mFirstOuterRadius);
mOuterLinePaint.setStrokeWidth(mFirstOuterRadius / 2);
mFirstOuterArcPaint.setStrokeWidth(mFirstOuterRadius / 4);
mXOffset = mFirstOuterRadius / 4;
mXOffset = mXOffset / 2;
//get the d/f btn firstOuterLine and innerAnimatedline
mYOffset = (mStartCenterY + (float) 0.875 * mOuterRadius) - (mStartCenterY + mInnerRadius);
mYOffset = mYOffset / 2;
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawFirstOuterCircle(canvas);
drawOuterCircle(canvas);
drawInnerCircle(canvas);
drawFirstOuterLine(canvas);
drawOuterLine(canvas);
animateInnerLine(canvas);
drawFirstOuterCornerArc(canvas);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//take care of paddingTop and paddingBottom
int paddingY = getPaddingBottom() + getPaddingTop();
//get height and width
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
height += paddingY;
setMeasuredDimension(width, height);
}
private void drawInnerCircle(Canvas canvas) {
drawCircle(canvas, mInnerRadius, mInnerCirclePaint);
}
private void drawOuterCircle(Canvas canvas) {
drawCircle(canvas, mOuterRadius, mOuterCirclePaint);
}
private void drawFirstOuterCircle(Canvas canvas) {
drawCircle(canvas, mFirstOuterRadius, mFirstOuterCirclePaint);
}
private void drawCircle(Canvas canvas, float radius, Paint paint) {
canvas.drawCircle(mStageCenterX, mEndCenterY, radius, paint);
}
private void drawOuterLine(Canvas canvas) {
float startY = mEndCenterY - (float) (0.875 * mOuterRadius);
float stopY = mStartCenterY + (float) (0.875 * mOuterRadius);
drawLine(canvas, startY, stopY, mOuterLinePaint);
}
private void drawFirstOuterLine(Canvas canvas) {
float startY = mEndCenterY - (float) (0.875 * mFirstOuterRadius);
float stopY = mStartCenterY + (float) (0.875 * mOuterRadius);
drawLine(canvas, startY, stopY, mFirstOuterLinePaint);
}
private void drawLine(Canvas canvas, float startY, float stopY, Paint paint) {
canvas.drawLine(mStageCenterX, startY, mStageCenterX, stopY, paint);
}
//simulate temperature measurement for now
private void animateInnerLine(Canvas canvas) {
if (mAnimator == null)
measureTemperature();
if (!mIsAnimating) {
mIncrementalTempValue = mEndCenterY + (float) (0.875 * mInnerRadius);
mIsAnimating = true;
} else {
mIncrementalTempValue = mEndCenterY + (float) (0.875 * mInnerRadius) - mIncrementalTempValue;
}
if (mIncrementalTempValue > mStartCenterY + mInnerRadius) {
float startY = mEndCenterY + (float) (0.875 * mInnerRadius);
drawLine(canvas, startY, mIncrementalTempValue, mInnerCirclePaint);
} else {
float startY = mEndCenterY + (float) (0.875 * mInnerRadius);
float stopY = mStartCenterY + mInnerRadius;
drawLine(canvas, startY, stopY, mInnerCirclePaint);
mIsAnimating = false;
stopMeasurement();
}
}
private void drawFirstOuterCornerArc(Canvas canvas) {
float y = mStartCenterY - (float) (0.875 * mFirstOuterRadius);
RectF rectF = new RectF(mStageCenterX - mFirstOuterRadius / 2 + mXOffset, y + mFirstOuterRadius, mStageCenterX + mFirstOuterRadius / 2 - mXOffset, y + (2 * mFirstOuterRadius) + mYOffset);
canvas.drawArc(rectF, -180, 180, false, mFirstOuterArcPaint);
}
public void setThermometerColor(int thermometerColor) {
this.mThermometerColor = thermometerColor;
mInnerCirclePaint.setColor(mThermometerColor);
mFirstOuterCirclePaint.setColor(mThermometerColor);
mFirstOuterArcPaint.setColor(mThermometerColor);
mInnerLinePaint.setColor(mThermometerColor);
mFirstOuterLinePaint.setColor(mThermometerColor);
invalidate();
}
//simulate temperature measurement for now
private void measureTemperature() {
mAnimator = new Animator();
mAnimator.start();
}
private class Animator implements Runnable {
private Scroller mScroller;
private final static int ANIM_START_DELAY = 1000;
private final static int ANIM_DURATION = 4000;
private boolean mRestartAnimation = false;
public Animator() {
mScroller = new Scroller(getContext(), new AccelerateDecelerateInterpolator());
}
public void run() {
if (mAnimator != this)
return;
if (mRestartAnimation) {
int startY = (int) (mStartCenterY - (float) (0.875 * mInnerRadius));
int dy = (int) (mEndCenterY + mInnerRadius);
mScroller.startScroll(0, startY, 0, dy, ANIM_DURATION);
mRestartAnimation = false;
}
boolean isScrolling = mScroller.computeScrollOffset();
mIncrementalTempValue = mScroller.getCurrY();
if (isScrolling) {
invalidate();
post(this);
} else {
stop();
}
}
public void start() {
mRestartAnimation = true;
postDelayed(this, ANIM_START_DELAY);
}
public void stop() {
removeCallbacks(this);
mAnimator = null;
}
}
private void stopMeasurement() {
if (mAnimator != null)
mAnimator.stop();
}
#Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
measureTemperature();
}
#Override
protected void onDetachedFromWindow() {
stopMeasurement();
super.onDetachedFromWindow();
}
#Override
public void setVisibility(int visibility) {
super.setVisibility(visibility);
switch (visibility) {
case View.VISIBLE:
measureTemperature();
break;
default:
stopMeasurement();
break;
}
}
}
attrs.xml file
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="Thermometer">
<attr name="therm_color" format="color" />
</declare-styleable>
</resources>

First I would provide 2 setters, one for color and one for the temperature value, normalized from 0 ... 1, where 0 means no visible bar, and 1 means a fully visible bar.
public void setColor(int color) {
mColor = color;
invalidate(); // important, this triggers onDraw
}
public void setValue(float value) {
mValue = -(value - 1);
invalidate(); // important, this triggers onDraw
}
Notice for value, I reverse the value, since we draw the bar from bottom up, instead from top down. It makes sense in the canvas.drawRect method.
If your CustomView may have custom sizes, set your size of the progressBar (I refer to the inner bar as progressBar) in onSizeChanged, as this gets called when the View has changed it's size.
If it is a fixed size, you can just provide those values statically in an init function or the constructor.
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mProgressRect = new Rect(
/*your bar left offset relative to base bitmap*/,
/*your bar top offset relative to base bitmap*/,
/*your bar total width*/,
/*your max bar height*/
);
}
Then in ondraw, take these values into account and draw accordingly.
First draw the Bitmap, depending on your selected color (I would provide the thermometer base as a Bitmap, as long as it does not have to be completely dynamically drawn (special requirements)
Then draw the progress bar, with an height based on mValue * totalHeight of the bar, using the color provided in the setter.
For example:
#Override
protected void onDraw(Canvas canvas) {
// draw your thermometer base, bitmap based on color value
canvas.drawBitmap( /*your base thermometer bitmap here*/ );
// draw the "progress"
canvas.drawRect(mProgressRect.left, mProgressRect.top + (mValue * mProgressRect.bottom - mProgressRect.top), mProgressRect.right, mProgressRect.bottom, mPaint);
}
Hope that helps.
P.S.:
If you want to have the thermometer base image also dynamically drawn, it's a slightly different story, it would involve creating a path first and draw it with a Paint object, instead of drawing the bitmap.
EDIT:
Even better, if you want a simple solution for the "roundness" of the bar, draw a line instead a rect.
Define a line paint object like this:
mPaint = new Paint();
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(20); // thickness of your bar
then in onDraw, instead drawRect:
// draw the "progress"
canvas.drawLine(mProgressRect.left, mProgressRect.top + (mValue * mProgressRect.bottom - mProgressRect.top), mProgressRect.left, mProgressRect.bottom, mPaint);
Be sure to adjust your mProgressRectaccordingly.

add view to linearlayout on a circle drawn in canvas

I have drawn a circle using canvas draw method. Now I want to add a view on circumference of circle. I can get coordinate of circle but totally lost how to add view to that coordinate.
Code is as below -
public class CircleView2 extends LinearLayout {
private int centerX, centerY;
private float fixedRadius = 30;
private Paint paint;
private Logger logger;
private Context context;
TextView textView;
public CircleView2(Context context) {
super(context);
setWillNotDraw(false);
doInit(context);
}
public CircleView2(Context context, AttributeSet attrs) {
super(context, attrs);
setWillNotDraw(false);
doInit(context);
}
private void doInit(Context context) {
this.context = context;
logger = new Logger(context);
fixedRadius = 30;
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5);
paint.setColor(Color.rgb(227, 73, 90));
textView = new TextView(context);
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
centerX = w / 2;
centerY = h / 2;
}
#Override
protected void onDraw(Canvas canvas) {
canvas.drawCircle(centerX, centerY, fixedRadius + 160, paint);
double x = centerX + (fixedRadius + 160) * Math.cos(Math.toDegrees(45.0));
double y = centerY + (fixedRadius + 160) * Math.sin(Math.toDegrees(45.0));
logger.debug(x + "");
logger.debug(y + "");
textView.setTextColor(Color.BLACK);
textView.setText("AAA");
textView.draw(canvas);
super.onDraw(canvas);
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
}
}
This draws circle just fine. But can't add textview. textview.draw(canvas) should add that to view, right ? How to add textview to view and that to at calculated coordinates ?
What I'm doing wrong here?