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import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;/**
* 创建时间：2016.8.11
* 创建人：王亮
* 功能作用：可变字符串文字大小颜色
* 逻辑：重绘制文字，使用记录类（MySpannableString）记录所要修改的区间信息，在使用重绘重新绘制，绘制之前根据用户给的位置信息计算位置坐标，
* 缺点：只能单行显示，一行排满不会切换到下一行显示
*/
public class MyTextView extends View {
private Paint paint;
private String changeText = “123456”;
private Float defaltTextSize = Float.valueOf(sp2px(10f));
private static Integer defaltTextColor = Color.BLACK;
private MySpannableString mySpannableString;
private static Context context;public MyTextView(Context context) {
super(context);
this.context = context;
}
public MyTextView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public MyTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
TypedArray attr = context.obtainStyledAttributes(attrs, R.styleable.myText, defStyleAttr, 0);
defaltTextSize = attr.getDimension(R.styleable.myText_defaltTextSize,defaltTextSize);
defaltTextColor = attr.getColor(R.styleable.myText_defaltTextColor,defaltTextColor);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height = getDefaultSize(getSuggestedMinimumHeight(),
heightMeasureSpec);
int width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
setMeasuredDimension(width, height);
viewWidth = getWidth();
viewHeight = getHeight();
paint = new Paint();
paint.setColor(defaltTextColor);
paint.setTextSize(defaltTextSize);
paint.setAntiAlias(true);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(getHeight() != 0 && mySpannableString != null){
List<MySpannableStringSetInfoDto> list = mySpannableString.getList();
if(list .size() > 0 && list.get(0).getStart() > 0){//绘制第一个改变的起始点之前的文字
canvas.drawText(changeText.substring(0,list.get(0).getStart())
,showTextCenterX,showTextBaselineY,paint);
}
float showTextWidth = list.size() > 0 ? paint.measureText(changeText,0,list.get(0).getStart()) : 0;//计算并保存每次已经绘制过得总的宽度，以保证下次绘制的部分在前一部分之后
//绘制中间部分（不包含起始改变点之前以及最后一个绘制的结束点之后的部分）
for(int i = 0 ; i < list.size();i++){
Paint paintChange = new Paint();
paintChange.setTextSize(list.get(i).getTextSize());
paintChange.setColor(list.get(i).getTextColor());
paintChange.setAntiAlias(true);
canvas.drawText(changeText.substring(list.get(i).getStart(),list.get(i).getStop())
,showTextCenterX + showTextWidth,showTextBaselineY,paintChange);//绘制需要改变的部分
//计算并保存每次已经绘制过得总的宽度，以保证下次绘制的部分在前一部分之后
showTextWidth += paintChange.measureText(changeText,list.get(i).getStart(),list.get(i).getStop());
//绘制两个要修改的区间的部分
if(i + 1 != list.size() && list.get(i).getStop() < list.get(i + 1).getStart()){
canvas.drawText(changeText.substring(list.get(i).getStop(),list.get(i + 1).getStart())
,showTextCenterX + showTextWidth,showTextBaselineY,paint);
//计算并保存每次已经绘制过得总的宽度，以保证下次绘制的部分在前一部分之后
showTextWidth += paint.measureText(changeText,list.get(i).getStop(),list.get(i + 1).getStart());
}
}
//绘制最后一个区间的终点之后的部分
if(list.get(list.size() - 1).getStop() < changeText.length() ) {
canvas.drawText(changeText.substring(list.get(list.size() - 1).getStop(), changeText.length())
, showTextCenterX + showTextWidth, showTextBaselineY, paint);
}
}
}
//设置文字以及显示位置
public void setText(MySpannableString mySpannableString,int showTextAlign){
this.mySpannableString = mySpannableString;
this.showTextAlign = showTextAlign;
this.changeText = mySpannableString.text;
viewWidth = getWidth();
viewHeight = getHeight();
}
/** 文字的方位 */
private int showTextAlign;
/** 左上角显示 */
public static final int TEXT_ALIGN_LEFT_TOP = 0x00000001;
/** 左侧中间显示 */
public static final int TEXT_ALIGN_LEFT_CENTER = 0x00000010;
/** 左侧下方显示 */
public static final int TEXT_ALIGN_LEFT_BOTTOM = 0x00000100;
/** 右上角显示 */
public static final int TEXT_ALIGN_RIGHT_TOP = 0x00001000;
/** 右侧中间显示 */
public static final int TEXT_ALIGN_RIGHT_CENTER = 0x00010000;
/** 右侧下方显示 */
public static final int TEXT_ALIGN_RIGHT_BOTTOM = 0x00100000;
/** 中间顶部显示 */
public static final int TEXT_ALIGN_CENTER_HORIZONTAL_TOP = 0x00001000|0x00010000;
/** 中间下方显示 */
public static final int TEXT_ALIGN_CENTER_HORIZONTAL_BOTTOM = 0x10000010;
/** 居中显示 */
public static final int TEXT_ALIGN_CENTER = 0x10000100;
/** 居中靠上显示 */
public static final int TEXT_ALIGN_CENTER_TOP = 0x10001000;
/** 居中靠下显示 */
public static final int TEXT_ALIGN_CENTER_BOTTOM = 0x10010000;
/** 居中靠左显示 */
public static final int TEXT_ALIGN_CENTER_LEFT = 0x10100000;
/** 居中靠右显示 */
public static final int TEXT_ALIGN_CENTER_RIGHT = 0x11000000;
/** 居中靠左上显示 */
public static final int TEXT_ALIGN_CENTER_LEFT_TOP = 0x11000001;
/** 居中靠左下显示 */
public static final int TEXT_ALIGN_CENTER_LEFT_BOTTOM = 0x11000010;
/** 居中靠右上显示 */
public static final int TEXT_ALIGN_CENTER_RIGHT_TOP = 0x11000100;
/** 居中靠右下显示 */
public static final int TEXT_ALIGN_CENTER_RIGHT_BOTTOM = 0x11001000;
/** */
/** 文本中轴线X坐标 */
private Float showTextCenterX;
/** 文本baseline线Y坐标 */
private Float showTextBaselineY;
/** 控件的宽度 */
private Integer viewWidth;
/** 控件的高度 */
private Integer viewHeight;
private Paint.FontMetrics fm;
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
viewWidth = getWidth();
viewHeight = getHeight();
if(changeText != null) {
setTextLocation();
postInvalidate();
}
super.onLayout(changed, left, top, right, bottom);
}
/**
* 定位文本绘制的位置
*/
private void setTextLocation() {
List<MySpannableStringSetInfoDto> list = mySpannableString.getList();
int maxTextSize = 0;//最大的文字的大小
float textWidth = 0; //文本的宽度
for(int i = 0 ; i < list.size() ; i++){//找出最大的字体的大小
if(list.get(i).getTextSize() > maxTextSize){
maxTextSize = list.get(i).getTextSize();
}
Paint paint = new Paint();
paint.setTextSize(list.get(i).getTextSize());
textWidth += paint.measureText(mySpannableString.text,list.get(i).getStart(),list.get(i).getStop());
}
Paint paint1 = new Paint();
paint1.setTextSize(defaltTextSize);
textWidth += paint1.measureText(mySpannableString.text,0,mySpannableString.text.length() - mySpannableString.changeCharNum);
Paint paint = new Paint();
paint.setTextSize(maxTextSize);
fm = paint.getFontMetrics();
float textHeight = fm.descent - fm.ascent;
float textCenterVerticalBaselineY = viewHeight / 2 - fm.descent + (fm.descent - fm.ascent) / 2;
switch (showTextAlign) {
case TEXT_ALIGN_CENTER://居中
showTextCenterX = (float)viewWidth / 2 - textWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_LEFT_CENTER://居中靠最左
showTextCenterX = 0f;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_RIGHT_CENTER://居中靠最右
showTextCenterX = viewWidth - textWidth;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_CENTER_HORIZONTAL_BOTTOM://居中靠最下
showTextCenterX = Float.valueOf(viewWidth / 2 - textWidth / 2);
showTextBaselineY = viewHeight - fm.bottom;
break;
case TEXT_ALIGN_CENTER_HORIZONTAL_TOP://居中靠最上
showTextCenterX = Float.valueOf(viewWidth / 2 - textWidth / 2);
showTextBaselineY = -fm.ascent;
break;
case TEXT_ALIGN_LEFT_TOP://左上
showTextCenterX = 0f;
showTextBaselineY = -fm.ascent;
break;
case TEXT_ALIGN_LEFT_BOTTOM://左下
showTextCenterX = 0f;//
showTextBaselineY = viewHeight - fm.bottom;
break;
case TEXT_ALIGN_RIGHT_TOP://右上
showTextCenterX = viewWidth - textWidth;
showTextBaselineY = -fm.ascent;
break;
case TEXT_ALIGN_RIGHT_BOTTOM://右下
showTextCenterX = viewWidth - textWidth;
showTextBaselineY = viewHeight - fm.bottom;
break;
case TEXT_ALIGN_CENTER_TOP://居中靠上
showTextCenterX = (float)viewWidth / 2 - textWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY - textHeight / 2;
break;
case TEXT_ALIGN_CENTER_BOTTOM:/** 居中靠下显示 */
showTextCenterX = (float)viewWidth / 2 - textWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY + textHeight / 2;
break;
case TEXT_ALIGN_CENTER_LEFT:/** 居中靠左显示 */
showTextCenterX = (float)viewWidth / 2 - textWidth ;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_CENTER_RIGHT:/** 居中靠右显示 */
showTextCenterX = (float)viewWidth / 2 + textWidth ;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_CENTER_LEFT_TOP:/** 居中靠左上显示 */
showTextCenterX = (float)viewWidth / 2 - textWidth ;
showTextBaselineY = textCenterVerticalBaselineY - textHeight ;
break;
case TEXT_ALIGN_CENTER_LEFT_BOTTOM:/** 居中靠左下显示 */
showTextCenterX = (float)viewWidth / 2 - textWidth ;
showTextBaselineY = textCenterVerticalBaselineY + textHeight ;
break;
case TEXT_ALIGN_CENTER_RIGHT_TOP:/** 居中靠右上显示 */
showTextCenterX = (float)viewWidth / 2 + textWidth ;
showTextBaselineY = textCenterVerticalBaselineY - textHeight ;
break;
case TEXT_ALIGN_CENTER_RIGHT_BOTTOM:/** 居中靠右下显示 */
showTextCenterX = (float)viewWidth / 2 + textWidth ;
showTextBaselineY = textCenterVerticalBaselineY + textHeight ;
break;
}
}
/**
* 将sp值转换为px值，保证文字大小不变
*
* @param spValue
* （DisplayMetrics类中属性scaledDensity）
* @return
*/
public static int sp2px(float spValue) {
final float fontScale = MyApplication.getContext().getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
/**
* 负责存储要修改的文字以及要修改的区间的参数
*/
public static class MySpannableString{
private List<MySpannableStringSetInfoDto> list = new ArrayList<>();
private String text;
private int changeCharNum = 0;
public MySpannableString(String text) {
this.text = text;
}
protected List<MySpannableStringSetInfoDto> getList() {
return list;
}
/**
* 设置要改变的文字所在的位置以及要改变的文字的大小以及颜色，可以多次设置，多次设置则改变多处位置
* @param start
* @param stop
* @param textSize
* @param textColor
*/
public void setMySpans(int start,int stop,int textSize,Integer textColor){
try {
for(int i = 0; i < list.size() ; i++){
if((start >= list.get(i).getStart() && start < list.get(i).getStop())
|| (stop > list.get(i).getStart() && stop <= list.get(i).getStop())
|| start > stop){
new Exception();
return;
}
}
}catch (Exception e){
Log.e("MySpannableString","End position can not be more than the previous starting point! "
+"or"
+" Starting position can not exceed the previous end! "
+"start > stop");//结束位不能超过以前的起点！或 起始位置不能超过以前的终点！或起点大于终点
}
MySpannableStringSetInfoDto dto;
if(textColor == null){
dto = new MySpannableStringSetInfoDto(start,stop,sp2px(textSize),defaltTextColor);
}else {
dto = new MySpannableStringSetInfoDto(start,stop,sp2px(textSize),textColor);
}
changeCharNum += stop - start;
list.add(dto);
}
}
/**
* 修改区间参数类
*/
private static class MySpannableStringSetInfoDto implements Comparator<MySpannableStringSetInfoDto>{
private int start;
private int stop;
private int textSize;
private int textColor;
protected MySpannableStringSetInfoDto(int start, int stop, int textSize, int textColor) {
this.start = start;
this.stop = stop;
this.textSize = textSize;
this.textColor = textColor;
}
protected int getStart() {
return start;
}
protected int getStop() {
return stop;
}
protected int getTextSize() {
return textSize;
}
protected int getTextColor() {
return textColor;
}
@Override
public int compare(MySpannableStringSetInfoDto t1, MySpannableStringSetInfoDto t2) {
if(t1.start > t2.start){
return -1;
}else if(t1.start < t2.start){
return 1;
}else {
return 0;
}
}
}}
“`
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