I am creating a custom view. This is basically a rectangle box with borders in it. I want the border to change color and make it focusable when a user clicks on it. I want the border to return to original color if the rectangle loses focus. I want to use this background as form background. I have tried android documentation and stack overflow answers and I am not able to do this. I have made it clickable but I am not able to proceed further than that.
public class FormBackgroundView extends View implements View.OnClickListener{
private int _borderColor;
Paint fillPaint, strokePaint;
Canvas canvas;
public FormBackgroundView(Context context) {
super(context);
init();
}
public FormBackgroundView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FormBackgroundView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
public FormBackgroundView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init();
}
private void init(){
super.setOnClickListener(this);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
fillPaint = new Paint();
strokePaint = new Paint();
fillPaint.setStyle(Paint.Style.FILL);
fillPaint.setColor(Color.WHITE);
strokePaint.setStyle(Paint.Style.FILL);
strokePaint.setColor(Color.BLACK);
strokePaint.setAntiAlias(true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
canvas.drawRoundRect(0,0,getWidth(),getHeight(), 10, 10, strokePaint);
canvas.drawRoundRect(0 + 3,0 + 3,getWidth() - 3,getHeight() - 3, 7, 7, fillPaint);
} else {
canvas.drawRect(0,0,getWidth(),getHeight(), strokePaint);
canvas.drawRect(0 + 4,0 + 4,getWidth() -4 ,getHeight() -4, fillPaint);
}
this.canvas = canvas;
}
@Override
public void onClick(View view) {
}
}
Your view is not automatically focusable in touch mode. You must make a call to "setFocusableInTouchMode()` if you want your view to get the focus when it is clicked (touched.) Although dated, I found this explanation useful to describe touch mode.
So, in your init()
add setFocusableInTouchMode(true)
.
Secondly, you don't do anything different in your onDraw()
whether the view is focused or not. Change it to something like the following:
protected void onDraw(Canvas canvas) {
// your paint code
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (isFocused()) { // draw the border
canvas.drawRoundRect(0, 0, getWidth(), getHeight(), 10, 10, strokePaint);
canvas.drawRoundRect(0 + 3, 0 + 3, getWidth() - 3, getHeight() - 3, 7, 7, fillPaint);
} else { // don't draw the border
canvas.drawRoundRect(0, 0, getWidth(), getHeight(), 7, 7, fillPaint);
}
} else {
//similar here
}
// The rest of your code
}
Try this:
public class FormBackGroundView extends View {
private int _borderColor;
Paint fillPaint, strokePaint;
Canvas canvas;
private boolean isFocused;
public FormBackGroundView(Context context) {
super(context);
init();
}
public FormBackGroundView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FormBackGroundView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
fillPaint = new Paint();
strokePaint = new Paint();
fillPaint.setStyle(Paint.Style.FILL);
strokePaint.setStyle(Paint.Style.FILL);
strokePaint.setAntiAlias(true);
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN && !isFocused) {
isFocused = true;
invalidate();
} else if (motionEvent.getAction() == MotionEvent.ACTION_UP && isFocused) {
isFocused = false;
invalidate();
}
return true;
}
});
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
fillPaint.setColor(Color.WHITE);
strokePaint.setColor(isFocused? Color.RED:Color.BLACK);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
canvas.drawRoundRect(0, 0, getWidth(), getHeight(), 10, 10, strokePaint);
canvas.drawRoundRect(0 + 3, 0 + 3, getWidth() - 3, getHeight() - 3, 7, 7, fillPaint);
} else {
canvas.drawRect(0, 0, getWidth(), getHeight(), strokePaint);
canvas.drawRect(0 + 4, 0 + 4, getWidth() - 4, getHeight() - 4, fillPaint);
}
}
}
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