ANDROID APP

280 บทที่ 11 เทคนิคขั้นสูงสำาหรับพัฒนาแอพบนแอนดรอยด์
}
mPaint.setStyle(Paint.Style.STROKE);
mShader = new SweepGradient(this.getMeasuredWidth()/2,
this.getMeasuredHeight()/2,
new int[] { Color.GREEN,
Color.RED,
Color.CYAN,Color.DKGRAY },
null);
mPaint.setShader(mShader);
public void setText(String text) {
mText = text;
requestLayout();
invalidate();
}
public void setTextSize(int size) {
mTextPaint.setTextSize(size);
requestLayout();
invalidate();
}
public void setTextColor(int color) {
mTextPaint.setColor(color);
invalidate();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
setMeasuredDimension(measureWidth(widthMeasureSpec),
measureHeight(heightMeasureSpec));
}
private int measureWidth(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
// We were told how big to be
result = specSize;
} else {
// Measure the text
result = (int) mTextPaint.measureText(mText)
+ getPaddingLeft()
+ getPaddingRight();
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}