public class CustomTitleView extends View {
/**
* 文本
*/
private String mTitleText;
/**
* 文本的颜色
*/
private int mTitleTextColor;
/**
* 文本的大小
*/
private int mTitleTextSize;
/**
* 绘制时控制文本绘制的范围
*/
private Rect mBound;
private Paint mPaint;
public CustomTitleView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CustomTitleView(Context context) {
this(context, null);
}
public CustomTitleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
/**
* 获得我们所定义的自定义属性
* R.styleable.CustomTitleView为自定义属性集合
*
*/
TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomTitleView, defStyle, 0);
int n = a.getIndexCount();
for (int i = 0; i < n; i++) {
int attr = a.getIndex(i);
switch (attr) {
case R.styleable.CustomTitleView_titleText:
mTitleText = a.getString(attr);
break;
case R.styleable.CustomTitleView_titleTextColor:
mTitleTextColor = a.getColor(attr, Color.BLACK);
break;
case R.styleable.CustomTitleView_titleTextSize:
mTitleTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
break;
}
}
a.recycle();
/**
* 获得绘制文本的宽和高
*/
mPaint = new Paint();
mPaint.setTextSize(mTitleTextSize);
mBound = new Rect();
mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);
this.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mTitleText = randomText();
postInvalidate();
}
});
}
private String randomText() {
Random random = new Random();
Set<Integer> set = new HashSet<Integer>();
while (set.size() < 4) {
int randomInt = random.nextInt(10);
set.add(randomInt);
}
StringBuffer sb = new StringBuffer();
for (Integer i : set) {
sb.append("" + i);
}
return sb.toString();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = 0;
int height = 0;
/**
* 设置宽度
*/
int specMode = MeasureSpec.getMode(widthMeasureSpec);
int specSize = MeasureSpec.getSize(widthMeasureSpec);
switch (specMode) {
case MeasureSpec.EXACTLY:
width = getPaddingLeft() + getPaddingRight() + specSize;
break;
case MeasureSpec.AT_MOST:
width = getPaddingLeft() + getPaddingRight() + mBound.width();
break;
}
/**
* 设置高度
*/
specMode = MeasureSpec.getMode(heightMeasureSpec);
specSize = MeasureSpec.getSize(heightMeasureSpec);
switch (specMode) {
case MeasureSpec.EXACTLY:
height = getPaddingTop() + getPaddingBottom() + specSize;
break;
case MeasureSpec.AT_MOST:
height = getPaddingTop() + getPaddingBottom() + mBound.height();
break;
}
setMeasuredDimension(width, height);
}
@Override
protected void onDraw(Canvas canvas) {
mPaint.setColor(Color.YELLOW);
canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);
mPaint.setColor(mTitleTextColor);
canvas.drawText(mTitleText, getWidth() / 2 - mBound.width() / 2, getHeight() / 2 + mBound.height() / 2, mPaint);
}
}