安卓自定义控件之可变字符串大小颜色控件

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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);}@Overrideprotected 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);}@Overrideprotected 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;@Overrideprotected 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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