would try to move multiple points along an L shaped path to simulate water flow from a point to another. I created a view that allow to create a single point and created an animation. Now I'm stuck as I cannot understand how to retrieve values from the animator add points to it and update animation. Can someone try to move me on right path?
public class FlowAnimation extends View implements ValueAnimator.AnimatorUpdateListener {
int radius = 20;
int color = Color.WHITE;
Paint paint = null;
private ValueAnimator mAnimator;
PathMeasure pm;
float point[] = {0f, 0f};
Path path;
public FlowAnimation(Context context) {
super(context);
paint = new Paint();
path = new Path();
path.lineTo(100,150);
path.lineTo(300,500);
path.close();
}
public FlowAnimation(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
}
public FlowAnimation(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public FlowAnimation(Context context, #Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
super.onDraw(canvas);
int x = getWidth();
int y = getHeight();
paint.setColor(this.color);
canvas.drawCircle(x / 2, y / 2, this.radius, paint);
}
public void startAnim() {
// sets the range of our value
mAnimator = ValueAnimator.ofInt(0, 180);
// sets the duration of our animation
mAnimator.setDuration(1000);
// registers our AnimatorUpdateListener
mAnimator.addUpdateListener(this);
mAnimator.start();
}
#Override
public void onAnimationUpdate(#NonNull ValueAnimator valueAnimator) {
//gets the current value of our animation
int value = (int) valueAnimator.getAnimatedValue();
}
}
I have some coordinates which is coming from the backend. I need to draw some rectangles or squares according to the coordinates on image in the (JAVA) android app. The rectangles or squares should be clickable you can see the coordinates in the image
public class DrawView extends View {
Paint paint = new Paint();
private void init() {
paint.setColor(Color.BLACK);
}
public DrawView(Context context) {
super(context);
init();
}
public DrawView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public DrawView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
#Override
public void onDraw(Canvas canvas) {
canvas.drawRoundRect(150,150,300,300,10,10,paint);
canvas.drawRect(300, 300, 600, 600,paint);
}
}
I'm trying to make a custom view on android as below. Please anyone give me any reference.
Here I found the solution.
public class BackgroundView extends View {
private Paint paint = new Paint();
private Path path = new Path();
public BackgroundView(Context context) {
super(context);
}
public BackgroundView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
}
public BackgroundView(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
Shader shader = new LinearGradient(0, 0, 0, h, Color.parseColor("#21E5AD"), Color.parseColor("#00C48C"), Shader.TileMode.MIRROR);
paint.setShader(shader);
float horizontalOffset = w * .8f;
float top = -h * .8f;
RectF ovalRect = new RectF(-horizontalOffset, top, w + horizontalOffset, (float) h / 2);
path.lineTo(ovalRect.left, top);
path.arcTo(ovalRect, 0, 180, false);
path.setFillType(Path.FillType.EVEN_ODD);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawPath(path, paint);
}
}
I want to add an imagebutton along this path that I have created in android studio. I have been trying to find a tutorial that would help me with pragmatically placing a few buttons along this path I have made.
I haven't tried anything but researching tutorials to find out what to do because I am completely lost. I just need someone who has done this or can refer me to something to learn.
public class MyView extends View {
Paint paint;
Path path;
public MyView(Context context) {
super(context);
init();
}
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init(){
paint = new Paint();
paint.setColor(Color.BLUE);
paint.setStrokeWidth(1);
paint.setStyle(Paint.Style.STROKE);
}
#Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
final RectF oval = new RectF();
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.GRAY);
;
oval.set(0, 20, 500, 1000);
canvas.drawArc(oval, 270, 180, false, paint);
}
}
I expect to learn how to align a few buttons along this path.
I used the old guide according to which the icon should appear in surfaceview.
Unfortunately the app dispalys the entire black surfaceview except icon.
I do not
know how to fix this because android studio does not display errors.
What i should add or change?
public class mySurfaceView extends SurfaceView {
private SurfaceHolder surfaceHolder;
private Bitmap bmpIcon;
public mySurfaceView(Context context) {
super(context);
init();
}
public mySurfaceView(Context context,
AttributeSet attrs) {
super(context, attrs);
init();
}
public mySurfaceView(Context context,
AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init(){
surfaceHolder = getHolder();
bmpIcon = BitmapFactory.decodeResource(getResources(),
R.drawable.icon);
surfaceHolder.addCallback(new SurfaceHolder.Callback(){
#Override
public void surfaceCreated(SurfaceHolder holder) {
Canvas canvas = holder.lockCanvas(null);
drawSomething(canvas);
holder.unlockCanvasAndPost(canvas);
}
#Override
public void surfaceChanged(SurfaceHolder holder,
int format, int width, int height) {
// TODO Auto-generated method stub
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}});
}
protected void drawSomething(Canvas canvas) {
canvas.drawColor(Color.BLACK);
if (bmpIcon != null){ canvas.drawBitmap(bmpIcon,
getWidth()/2, getHeight()/2, null);
}
}
}
ScreenShot
my icon
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
<path
android:fillColor="#FF020000"
android:pathData="M6,18c0,0.55 0.45,1 1,1h1v3.5c0,0.83 0.67,1.5 1.5,1.5s1.5,-0.67 1.5,-1.5L11,19h2v3.5c0,0.83 0.67,1.5 1.5,1.5s1.5,-0.67 1.5,-1.5L16,19h1c0.55,0 1,-0.45 1,-1L18,8L6,8v10zM3.5,8C2.67,8 2,8.67 2,9.5v7c0,0.83 0.67,1.5 1.5,1.5S5,17.33 5,16.5v-7C5,8.67 4.33,8 3.5,8zM20.5,8c-0.83,0 -1.5,0.67 -1.5,1.5v7c0,0.83 0.67,1.5 1.5,1.5s1.5,-0.67 1.5,-1.5v-7c0,-0.83 -0.67,-1.5 -1.5,-1.5zM15.53,2.16l1.3,-1.3c0.2,-0.2 0.2,-0.51 0,-0.71 -0.2,-0.2 -0.51,-0.2 -0.71,0l-1.48,1.48C13.85,1.23 12.95,1 12,1c-0.96,0 -1.86,0.23 -2.66,0.63L7.85,0.15c-0.2,-0.2 -0.51,-0.2 -0.71,0 -0.2,0.2 -0.2,0.51 0,0.71l1.31,1.31C6.97,3.26 6,5.01 6,7h12c0,-1.99 -0.97,-3.75 -2.47,-4.84zM10,5L9,5L9,4h1v1zM15,5h-1L14,4h1v1z"/>
</vector>
You gave black color in drawSomething method, If you change the color your background will change.
protected void drawSomething(Canvas canvas) {
//canvas.drawColor(Color.BLACK);
canvas.drawColor(Color.RED); // here i changed black to red(add you expected color here)
if (bmpIcon != null) {
canvas.drawBitmap(bmpIcon,
getWidth() / 2, getHeight() / 2, null);
}
}
As your drawble is vector drawable so use the following function to convert into bitmap
public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
Drawable drawable = ContextCompat.getDrawable(context, drawableId);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
drawable = (DrawableCompat.wrap(drawable)).mutate();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
and create your bitmap like this
bmpIcon = getBitmapFromVectorDrawable(getContext(), R.drawable.icon);
it will work fine.
and your final code will be like this,
public class MySurface extends SurfaceView {
private SurfaceHolder surfaceHolder;
private Bitmap bmpIcon;
public MySurface(Context context) {
super(context);
init();
}
public MySurface(Context context,
AttributeSet attrs) {
super(context, attrs);
init();
}
public MySurface(Context context,
AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
Drawable drawable = ContextCompat.getDrawable(context, drawableId);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
drawable = (DrawableCompat.wrap(drawable)).mutate();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
private void init() {
surfaceHolder = getHolder();
bmpIcon = getBitmapFromVectorDrawable(getContext(), R.drawable.icon);
surfaceHolder.addCallback(new SurfaceHolder.Callback() {
#Override
public void surfaceCreated(SurfaceHolder holder) {
Canvas canvas = holder.lockCanvas(null);
drawSomething(canvas);
holder.unlockCanvasAndPost(canvas);
}
#Override
public void surfaceChanged(SurfaceHolder holder,
int format, int width, int height) {
// TODO Auto-generated method stub
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
});
}
protected void drawSomething(Canvas canvas) {
canvas.drawColor(Color.RED);
if (bmpIcon != null) {
canvas.drawBitmap(bmpIcon,
getWidth() / 2, getHeight() / 2, null);
}
}
}