Develop Reference

How to use a custom view in main activity

I'm developing a game which shows shapes randomly, I got the class but I got no idea how to call the custom view from my GameFragment. I was wondering if anyone can help me to achieve it.
CustomView.java
public class CustomViews extends View {
private final int SQUARE_SIZE = 500;
private RectF rectF;
private Paint paint;
private boolean CIRCLE = false;
private boolean RECTANGLE = false;
public CustomViews(Context context) {
super(context);
init(null);
}
public CustomViews(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
init(attrs);
}
public CustomViews(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs);
}
public CustomViews(Context context, #Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(attrs);
}
private void init(#Nullable AttributeSet set) {
rectF = new RectF();
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
randomColorGenerator();
}
public void rect(Canvas canvas) {
int height = canvas.getHeight() / 2;
int width = canvas.getWidth() / 2;
rectF.set(width - 200, height - 200, width + 200, height + 200);
}
private void circle(Canvas canvas) {
float cx;
float cy;
float radius = 200;
cx = canvas.getWidth() / 2;
cy = canvas.getWidth() / 2;
canvas.drawCircle(cx, cy, radius, paint);
}
private void randomColorGenerator() {
Random random = new Random();
int choices = 3;
switch (random.nextInt(choices)) {
case 0:
paint.setColor(Color.GREEN);
break;
case 1:
paint.setColor(Color.RED);
break;
case 2:
paint.setColor(Color.BLACK);
break;
}
}
public void randomShapeGenerator(Canvas canvas) {
Random random = new Random();
int numberOfMethods = 2;
switch (random.nextInt(numberOfMethods)) {
case 0:
rect(canvas);
rectSelected();
break;
case 1:
circle(canvas);
circleSelected();
break;
}
}
public boolean circleSelected(){
RECTANGLE = false;
return CIRCLE = true;
}
public boolean rectSelected( ) {
CIRCLE = false;
return RECTANGLE = true;
}
#Override
public void onDraw(Canvas canvas) {
randomShapeGenerator(canvas);
canvas.drawRect(rectF, paint);
}
}
Now I need to call it from my GameFragment where there are some buttons and whenever you click on them a new random shape must be generate. Is anyone got any idea?

Assuming your fragment has a LinearLayout with id main_content then this might help you to add your custom view programmatically:
Button btn = findViewById(R.id.yourbutton);
btn.setOnClickListener(v -> {
LinearLayout main_layout = findViewById(R.id.main_content);
CustomViews customView = new CustomViews(this);
customView.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
main_layout.addView(customView);
});
layoutParams might be also tuned according your needs.
You have to take into account where you want to display the customViews and also their sizes. For instance, if you have a linear layout with vertical orientation, you can add views in the following way:
main_layout.addView(customView, 400, 400);
This will display multiple customViews one below the other (until the screen's height is reached).
Indeed, CustomViews has to be modified a bit (here are two methods to be changed):
public void rect(Canvas canvas) {
int height = canvas.getHeight() / 2;
int width = canvas.getWidth() / 2;
rectF.set(width - 200, height - 200, width + 200, height + 200);
canvas.drawRect(rectF, paint);
}
#Override
public void onDraw(Canvas canvas) {
randomShapeGenerator(canvas);
}

Page line in editText in android

how can appear pagelines in the editText in android , like picture ..?

It is not possible with Default EditText, you need to find out any custom library to use this type of functionality with EditText.

You can do it with custom EditText like the one below (copied from here).
public class LinedEditText extends EditText {
private Paint mPaint = new Paint();
public LinedEditText(Context context) {
super(context);
initPaint();
}
public LinedEditText(Context context, AttributeSet attrs) {
super(context, attrs);
initPaint();
}
public LinedEditText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initPaint();
}
private void initPaint() {
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setColor(0x80000000);
}
#Override protected void onDraw(Canvas canvas) {
int left = getLeft();
int right = getRight();
int paddingTop = getPaddingTop();
int paddingBottom = getPaddingBottom();
int paddingLeft = getPaddingLeft();
int paddingRight = getPaddingRight();
int height = getHeight();
int lineHeight = getLineHeight();
int count = (height-paddingTop-paddingBottom) / lineHeight;
for (int i = 0; i < count; i++) {
int baseline = lineHeight * (i+1) + paddingTop;
canvas.drawLine(left+paddingLeft, baseline, right-paddingRight, baseline, mPaint);
}
super.onDraw(canvas);
}
}

Animate Edit text color change from outside to inside

I have custom edit text that allows to change and animate background color, but when I try to switch the animation to go from outside to inside, the edit text takes the paint color and overlay over edit text highlight color. So my activated color for edit text is blue and I am trying to change to green with animation, the outside in animation in the class below ends up with a mix of blue and green.
But the inside out animation work fine, I am not sure why. Any help would be appreciated.
So basically playInsideOut() method does animation fine but playOutsideInAnimation() ends up with weird color.
public class AnimatedEditText extends EditText {
private Paint paint;
private Rect rect;
private static final int ANIMATION_DURATION = 500;
public AnimatedEditText(Context context) {
super(context);
}
public AnimatedEditText(Context context, AttributeSet attrs) {
super(context, attrs);
}
public AnimatedEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public AnimatedEditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected void onFinishInflate() {
super.onFinishInflate();
resetPaint(getResources().getColor(R.color.grey));
}
public void playAnimationInsideOut(int color) {
getBackground().setColorFilter(null);
resetPaint(getResources().getColor(color));
rect.top = getMeasuredHeight() - getResources().getDimensionPixelSize(R.dimen.line_offset);
rect.bottom = getMeasuredHeight();
rect.left = getMeasuredWidth() / 2;
rect.right = getMeasuredWidth() / 2;
ValueAnimator animator = ValueAnimator.ofPropertyValuesHolder(PropertyValuesHolder.ofInt("left", rect.left, 0), PropertyValuesHolder.ofInt("right", rect.right, getMeasuredWidth()));
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
rect.left = (int) animation.getAnimatedValue("left");
rect.right = (int) animation.getAnimatedValue("right");
}
});
animator.setDuration(ANIMATION_DURATION);
animator.start();
}
public void playAnimationOutsideIn() {
getBackground().setColorFilter(getResources().getColor(R.color.green), PorterDuff.Mode.SRC_ATOP);
rect.top = getMeasuredHeight() - getResources().getDimensionPixelSize(R.dimen.line_offset);
rect.bottom = getMeasuredHeight();
rect.left = getMeasuredWidth() / 2;
rect.right = getMeasuredWidth() / 2;
ValueAnimator animator = ValueAnimator.ofPropertyValuesHolder(PropertyValuesHolder.ofInt("left", 0, rect.left), PropertyValuesHolder.ofInt("right",getMeasuredWidth(), rect.right ));
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
rect.left = (int) animation.getAnimatedValue("left");
rect.right = (int) animation.getAnimatedValue("right");
}
});
animator.setDuration(ANIMATION_DURATION);
animator.start();
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawRect(rect, paint);
invalidate();
}
private void resetPaint(int color) {
paint = new Paint();
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));
paint.setColor(color);
rect = new Rect();
setLayerType(LAYER_TYPE_SOFTWARE, null);
}
}

Android: Custom circle ProgressBar with spaces in between

I am trying to create a custom view that has a Circle and in it, I have to have sections in run time as shown in the image below. I tried a lot of stuff in onDraw method but got no luck. I even tried https://github.com/donvigo/CustomProgressControls . Basically, I want to give a number of sections and then in each section I can select colors as per my need.
I am looking for ProgressBar that should have gap/space as shown in the image; in between circles. Say if I have given 5 sections, 3 of which should be "full", it should color the first 3 in red, and the other 2 in green, for example.
To draw I am doing like:
private void initExternalCirclePainter() {
internalCirclePaint = new Paint();
internalCirclePaint.setAntiAlias(true);
internalCirclePaint.setStrokeWidth(internalStrokeWidth);
internalCirclePaint.setColor(color);
internalCirclePaint.setStyle(Paint.Style.STROKE);
internalCirclePaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, dashSpace));
}

I might be a little late to the party, but I actually wrote a custom component that has 2 rings that look quite similar to what you're trying to achieve. You can just remove the outer ring easily. The image of what I got in the end:
Here's the class:
public class RoundedSectionProgressBar extends View {
// The amount of degrees that we wanna reserve for the divider between 2 sections
private static final float DIVIDER_ANGLE = 7;
public static final float DEGREES_IN_CIRCLE = 360;
public static final int PADDING = 18;
public static final int PADDING2 = 12;
protected final Paint paint = new Paint();
protected final Paint waitingPaint = new Paint();
protected final Paint backgroundPaint = new Paint();
private int totalSections = 5;
private int fullSections = 2;
private int waiting = 3; // The outer ring. You can omit this
private RectF rect = new RectF();
public RoundedSectionProgressBar(Context context) {
super(context);
init(context, null);
}
public RoundedSectionProgressBar(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public RoundedSectionProgressBar(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
// Can come from attrs if need be?
int strokeWidth = 3;
setupPaint(context, strokeWidth, paint, R.color.filled_color_inner_ring);
setupPaint(context, strokeWidth, waitingPaint, R.color.empty_color_inner_ring);
setupPaint(context, strokeWidth, backgroundPaint, R.color.filled_color_outer_ring);
}
private void setupPaint(Context context, int strokeWidth, Paint backgroundPaint, int colorRes) {
backgroundPaint.setStrokeCap(Paint.Cap.SQUARE);
backgroundPaint.setColor(context.getResources().getColor(colorRes));
backgroundPaint.setAntiAlias(true);
backgroundPaint.setStrokeWidth(strokeWidth);
backgroundPaint.setStyle(Paint.Style.STROKE);
}
public int getTotalSections() {
return totalSections;
}
public void setTotalSections(int totalSections) {
this.totalSections = totalSections;
invalidate();
}
public int getFullSections() {
return fullSections;
}
public void setNumberOfSections(int fullSections, int totalSections, int waiting) {
this.fullSections = fullSections;
this.totalSections = totalSections;
this.waiting = waiting;
invalidate();
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
rect.set(getLeft() + PADDING, getTop() + PADDING, getRight() - PADDING, getBottom() - PADDING);
float angleOfSection = (DEGREES_IN_CIRCLE / totalSections) - DIVIDER_ANGLE;
// Drawing the inner ring
for (int i = 0; i < totalSections; i++) {
// -90 because it doesn't start at the top, so rotate by -90
// divider_angle/2 especially in 2 sections, it's visibly rotated by Divider angle, so we split this between last and first
float startAngle = -90 + i * (angleOfSection + DIVIDER_ANGLE) + DIVIDER_ANGLE / 2;
if (i < fullSections) {
canvas.drawArc(rect, startAngle, angleOfSection, false, paint);
} else {
canvas.drawArc(rect, startAngle, angleOfSection, false, backgroundPaint);
}
}
// Drawing the outer ring
rect.set(getLeft() + PADDING2, getTop() + PADDING2, getRight() - PADDING2, getBottom() - PADDING2);
for (int i = 0; i < waiting; i++) {
float startAngle = -90 + i * (angleOfSection + DIVIDER_ANGLE) + DIVIDER_ANGLE / 2;
canvas.drawArc(rect, startAngle, angleOfSection, false, waitingPaint);
}
}
}
Notice that this code won't give you the outer ring's 'empty' slots, since we decided against them in the end. The inner circle will have both the empty and filled slots. The whole class can be reused, and it's responsible just for the 2 rings that are drawn, the 6/6, +3 and the red circle are parts of another view.
The most important piece of the code is the onDraw method. It contains the logic for drawing the arcs in the for loop, as well as the logic for calculating the angles and adding spaces between them. Everything is rotated by -90 degrees, because I needed it to start at the top, rather than on the right, as it is the 0-degree angle in Android. It's not that complex, and you can modify it to fit your needs better should you need to.

I find it easier to do math for drawArc(operating on angle values based on number of sections) rather than computing the arc length.
Here's a quick idea, with a lot of hard-coded properties, but you should be able to get the idea:
public class MyStrokeCircleView extends View {
private Paint mPaint;
private RectF mRect;
private int mPadding;
private int mSections;
private int mFullArcSliceLength;
private int mColorArcLineLength;
private int mArcSectionGap;
public MyStrokeCircleView(Context context) {
super(context);
init(null, 0);
}
public MyStrokeCircleView(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public MyStrokeCircleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs, defStyle);
}
private void init(AttributeSet attrs, int defStyle) {
mPaint = new Paint();
mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(10);
mPaint.setColor(ContextCompat.getColor(getContext(), android.R.color.darker_gray));
mPadding = 5;
mRect = new RectF(mPadding, mPadding, mPadding, mPadding);
mSections = 4;
mFullArcSliceLength = 360 / mSections;
mArcSectionGap = mFullArcSliceLength / 10;
mColorArcLineLength = mFullArcSliceLength - 2 * mArcSectionGap;
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mRect.right = getWidth() - mPadding;
mRect.bottom = getHeight() - mPadding;
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for (int i = 0; i < mSections; i++) {
canvas.drawArc(mRect, i * mFullArcSliceLength + mArcSectionGap, mColorArcLineLength, false, mPaint);
}
}
}

Prevent ImageView redraw state after hide keyboard

First, I have a view like this:
When user press some text in edittext, I try to draw some rectangles in ImageView with specific coordinates. The problem is when the soft keyboard is hidden, all draw state of Imageview display wrong coordinates, look like it invalidated the imageview. I wonder is there any way to stop this.
Here is my Custom Drawable Imageview:
public class DrawableImageView extends ImageView {
private Paint ptBlur;
private List<Rect> rects;
private int originWidth;
private int originHeight;
public DrawableImageView(Context context) {
super(context);
initPaint();
}
public DrawableImageView(Context context, AttributeSet attrs) {
super(context, attrs);
initPaint();
}
public DrawableImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initPaint();
}
public void setRects(List<Rect> rects, int originWidth, int originHeight) {
this.originHeight = originHeight;
this.originWidth = originWidth;
this.rects = rects;
invalidate();
}
private void initPaint() {
ptBlur = new Paint();
ptBlur.setColor(Color.YELLOW);
ptBlur.setStyle(Paint.Style.STROKE);
ptBlur.setStrokeWidth(5);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (rects != null) {
int width = getWidth();
int height = getHeight();
for (Rect rect : rects) {
rect.bottom = Math.round(height * rect.bottom / originHeight);
rect.left = Math.round(width * rect.left / originWidth);
rect.right = Math.round(width * rect.right / originWidth);
rect.top = Math.round(height * rect.top / originHeight);
canvas.drawRect(rect, ptBlur);
}
}
}
}
The OnEditorActionListener for EditText:
// get the rectangles and draw
List<Rect> rects = DataUtil.getHighlightRectList(searchText);
drawableImageView.setRects(rects, pageWidth, pageHeight);