Viacheslav Viacheslav - 22 days ago 6
Android Question

How to I know parent padding from custom view?

I create a custom view and added it to layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:custom="http://schemas.android.com/apk/res/com.eleks.customview"
android:padding="20dp"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<com.eleks.customview.CView
android:id="@+id/circle1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
custom:textSize="@dimen/circle_text_size"
custom:text="@string/circle_default_text"
custom:radius="@dimen/circle_radius"
custom:textColor="@color/circle_text"
custom:textBackground="@color/circle_background" />

</LinearLayout>


I implement onMeasure in custom view and set width and height. But my view ignores parent padding (20dp). See the picture:

enter image description here

public class CView extends View
{
private static final String TAG = "CView";

// default value
private static final int DEFAULT_RADIUS = 30;
private static final int DEFAULT_TEXT_SIZE = 12;
private static final int DEFAULT_TEXT_COLOR = Color.BLACK;
private static final int DEFAULT_BACKGROUND = Color.GRAY;
private static final int DEFAULT_WIDTH = DEFAULT_RADIUS * 2;
private static final int DEFAULT_HEIGHT = DEFAULT_RADIUS * 2;

// variables
private Paint mBackgroundPaint = null;
private Paint mTextPaint = null;
private float mCircleX = 0;
private float mCircleY = 0;
private float mTextX = 0;
private float mTextY = 0;
private int mWidth = DEFAULT_WIDTH;
private int mHeight = DEFAULT_HEIGHT;

// attrs
private int mTextColor = DEFAULT_TEXT_COLOR;
private int mBackground = DEFAULT_BACKGROUND;
private float mRadius = DEFAULT_RADIUS;
private String mText = null;
private float mTextSize = 0;

public CView(Context context)
{
super(context);
Log.d(TAG, "init view");
init(null);
}

public CView(Context context, AttributeSet attrs)
{
super(context, attrs);
Log.d(TAG, "init view");
init(attrs);
}

private void init(AttributeSet attrs)
{
if (attrs != null)
{
TypedArray a = getContext().getTheme().obtainStyledAttributes(attrs, R.styleable.CircleButton, 0, 0);
try
{
mTextColor = a.getColor(R.styleable.CircleButton_textColor, DEFAULT_TEXT_COLOR);
mBackground = a.getColor(R.styleable.CircleButton_textBackground, DEFAULT_BACKGROUND);
mRadius = a.getDimension(R.styleable.CircleButton_radius, DEFAULT_RADIUS);
mText = a.getString(R.styleable.CircleButton_text);
mTextSize = a.getDimensionPixelOffset(R.styleable.CircleButton_textSize, DEFAULT_TEXT_SIZE);
}
finally
{
a.recycle();
}
}
mBackgroundPaint = new Paint();
mBackgroundPaint.setColor(mBackground);

this.setMinimumHeight((int) mRadius * 2);
this.setMinimumWidth((int) mRadius * 2);
}

private void initLayoutParams()
{
LayoutParams params = this.getLayoutParams();
params.width = mWidth + getLeft();
params.height = mHeight + getTop();
Log.d(TAG, "params| width: " + mWidth + " height: " + mHeight);
}

private void initText()
{
mTextPaint = new Paint();
mTextPaint.setColor(mTextColor);
mTextPaint.setTextSize(mTextSize);
Rect textRect = new Rect();
if (mText == null)
{
mText = "";
}
mTextPaint.getTextBounds(mText, 0, mText.length(), textRect);
mTextX = mCircleX - (((Math.abs(textRect.right) - Math.abs(textRect.left))) / 2);
mTextY = mRadius + ((Math.abs(textRect.top) - (Math.abs(textRect.bottom))) / 2);
Log.d(TAG, "text| x: " + mTextX + " y: " + mTextY);
}

@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
Log.d(TAG, "init onDraw");

if (canvas != null)
{
canvas.drawCircle(mCircleX, mCircleY, mRadius, mBackgroundPaint);
// canvas.drawText(mText, mTextX, mTextY, mTextPaint);
}
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// super.onMeasure(widthMeasureSpec, heightMeasureSpec);
Log.d(TAG, "init onMeasure");
setWidth(MeasureSpec.getMode(widthMeasureSpec), MeasureSpec.getSize(widthMeasureSpec));
setHeight(MeasureSpec.getMode(heightMeasureSpec), MeasureSpec.getSize(heightMeasureSpec));
mCircleX = getLeft() - getPaddingLeft() + mRadius;
mCircleY = getTop() - getPaddingTop() + mRadius;
fixedSize();
Log.d(TAG, "circle| x: " + mCircleX + " y: " + mCircleY);
this.setMeasuredDimension(mWidth, mHeight);
// initText();

}

private void fixedSize()
{
if (mWidth > mHeight)
{
mHeight = mWidth;
}
else if (mHeight > mWidth)
{
mWidth = mHeight;
}
}

private void setWidth(final int modeWidth, final int width)
{
switch (modeWidth)
{
case MeasureSpec.AT_MOST:
Log.d(TAG, "width mode is AT_MOST");
if (mRadius > 0)
{
mWidth = (int) (mRadius * 2) + getPaddingLeft() + getPaddingRight();
}
else
{
mWidth = DEFAULT_WIDTH;
}
mWidth = Math.min(mWidth, width);
break;
case MeasureSpec.EXACTLY:
Log.d(TAG, "width mode is EXACTLY");
break;
case MeasureSpec.UNSPECIFIED:
default:
Log.d(TAG, "width mode is UNSPECIFIED");
mWidth = DEFAULT_WIDTH;
break;
}
}

private void setHeight(final int modeHeight, final int height)
{
switch (modeHeight)
{
case MeasureSpec.AT_MOST:
Log.d(TAG, "height mode is AT_MOST");
if (mRadius > 0)
{
mHeight = (int) (mRadius * 2) + getPaddingTop() + getPaddingBottom();
}
else
{
mHeight = DEFAULT_HEIGHT;
}
mHeight = Math.min(mHeight, height);
break;
case MeasureSpec.EXACTLY:
Log.d(TAG, "height mode is EXACTLY");
break;
case MeasureSpec.UNSPECIFIED:
default:
Log.d(TAG, "height mode is UNSPECIFIED");
mHeight = DEFAULT_HEIGHT;
break;
}
}

@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom)
{
// super.onLayout(changed, left, top, right, bottom);
Log.d(TAG, "init onLayout");
initLayoutParams();
}


How can I get parent's padding?

Answer

use getParent() but imho if you need it there is some design flaw