Android 自动适应字体大小的EditText

Android 中 EditText 单行显示时，如果字体过多，自动缩小字体，在字号小于指定字号时，显示”…” ，具体请参考如下代码：

1. packagecom.zepp.newsports.ui.widget;
2.  
3. importandroid.content.Context;
4. importandroid.content.res.TypedArray;
5. importandroid.graphics.Canvas;
6. importandroid.graphics.Color;
7. importandroid.graphics.Rect;
8. importandroid.text.TextPaint;
9. importandroid.text.TextUtils;
10. importandroid.util.AttributeSet;
11. importandroid.widget.TextView;
12. importcom.zepp.newsports.R;
13. importcom.zepp.z3a.common.util.FontUtil;
14.  
15. /**
16. *CreatedbyQYon15/7/20.
17. */
18. publicclassAutoStretchTextViewextendsTextView{
19. privatefloatDEFAULT_MIN_TEXTSIZE=28;
20. privateStringTAG=AutoStretchTextView.class.getSimpleName();
21. privateRectviewRect;
22. privateinttextColor=Color.LTGRAY;
23. privatebooleancenterHorization;
24. privatebooleanalignLeft;
25.  
26. publicAutoStretchTextView(Contextcontext){
27. super(context);
28. }
29.  
30. publicAutoStretchTextView(Contextcontext,AttributeSetattrs){
31. super(context,attrs);
32. init(attrs);
33. }
34.  
35. publicAutoStretchTextView(Contextcontext,AttributeSetattrs,intdefStyleAttr){
36. super(context,attrs,defStyleAttr);
37. init(attrs);
38. }
39.  
40. @OverrideprotectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){
41. setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),MeasureSpec.getSize(heightMeasureSpec));
42. }
43.  
44. @OverrideprotectedvoidonDraw(Canvascanvas){
45. intlayoutWidth=getWidth();
46. doublecharWidth=0;
47. intheight=getHeight();
48. TextPaintpaint=getPaint();
49. Stringtext=getText().toString();
50. viewRect=newRect();
51.  
52. floatdrawedWidth=paint.measureText(text);
53. char[]textCharArray=text.toCharArray();
54. if(textCharArray.length>0){
55. paint.getTextBounds(textCharArray,0,textCharArray.length,viewRect);
56. charWidth=paint.measureText(textCharArray,textCharArray.length-1,1);
57. }
58.  
59. while(layoutWidth-drawedWidth<>
60. if(getTextSize()<=DEFAULT_MIN_TEXTSIZE){
62. StringBuilderbuilder=newStringBuilder();
63. for(charchars:textCharArray){
64. builder.append(chars);
65. floatvisibleTextWidth=paint.measureText(builder.toString()+“…”);
66. if(layoutWidth-visibleTextWidth<1.5*charWidth){
67. text=builder.append(”…”).toString();
68. char[]chars1=text.toCharArray();
69. paint.getTextBounds(chars1,0,chars1.length,viewRect);
70. break;
71. }
72. }break;
73. }
74. paint.setTextSize(getTextSize()-1);
75. drawedWidth=paint.measureText(text);
76. if(textCharArray.length>0)
77. charWidth=paint.measureText(textCharArray,textCharArray.length-1,1);
78. }
79.  
80.  
81. floatstartY=height-(height-viewRect.height())*0.5f;
82. paint.setColor(textColor);
83. if(centerHorization){
84. canvas.drawText(text,Math.abs(layoutWidth-viewRect.width())/2,startY,paint);
85. }elseif(alignLeft){
86. canvas.drawText(text,5,startY,paint);
87. }else{
88. intstartX=layoutWidth-viewRect.width();
89. if(startX<0)
90. startX=0;
91. canvas.drawText(text,startX,startY,paint);
92. }
93. }
94.  
95. privatevoidinit(AttributeSetattrs){
96. if(!isInEditMode()){
97.  
98. Stringresource=attrs.getAttributeValue(”http://schemas.android.com/apk/res/android”,“textColor”);
99. if(!TextUtils.isEmpty(resource)){
100. if(resource.contains(“@”)){
101. textColor=getContext().getResources().getColor(Integer.valueOf(resource.substring(1,resource.length())));
102. }else{
103. textColor=Color.parseColor(resource);
104. }
105. }
106.  
107. TypedArraytypedArray=
108. getContext().obtainStyledAttributes(attrs,R.styleable.AutoStretchTextView);
109. DEFAULT_MIN_TEXTSIZE=
110. typedArray.getDimension(R.styleable.AutoStretchTextView_default_min_textsize,
111. DEFAULT_MIN_TEXTSIZE);
112. typedArray.recycle();
113. intfont=attrs.getAttributeIntValue(“http://schemas.android.com/apk/res-auto”,“font”,
114. 0);
115. getPaint().setTypeface(FontUtil.getInstance().getFontTypeface(getContext(),font));
116.  
117. centerHorization=
118. attrs.getAttributeBooleanValue(”http://schemas.android.com/apk/res-auto”,
119. ”centerHorization”,false);
120. alignLeft=
121. attrs.getAttributeBooleanValue(”http://schemas.android.com/apk/res-auto”,
122. ”alignLeft”,false);
123. }
124. }
125.  
126.  
127. }

     package com.zepp.newsports.ui.widget;
     
     import android.content.Context;
     import android.content.res.TypedArray;
     import android.graphics.Canvas;
     import android.graphics.Color;
     import android.graphics.Rect;
     import android.text.TextPaint;
     import android.text.TextUtils;
     import android.util.AttributeSet;
     import android.widget.TextView;
     import com.zepp.newsports.R;
     import com.zepp.z3a.common.util.FontUtil;
     
     /**
      * Created by QY on 15/7/20.
      */
     public class AutoStretchTextView extends TextView {
         private float DEFAULT_MIN_TEXTSIZE = 28;
         private String TAG = AutoStretchTextView.class.getSimpleName();
         private Rect viewRect;
         private int textColor = Color.LTGRAY;
         private boolean centerHorization;
         private boolean alignLeft;
     
         public AutoStretchTextView(Context context) {
             super(context);
         }
     
         public AutoStretchTextView(Context context, AttributeSet attrs) {
             super(context, attrs);
             init(attrs);
         }
     
         public AutoStretchTextView(Context context, AttributeSet attrs, int defStyleAttr) {
             super(context, attrs, defStyleAttr);
             init(attrs);
         }
     
         @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
             setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec));
         }
     
         @Override protected void onDraw(Canvas canvas) {
             int layoutWidth = getWidth();
             double charWidth = 0;
             int height = getHeight();
             TextPaint paint = getPaint();
             String text = getText().toString();
             viewRect = new Rect();
     
             float drawedWidth = paint.measureText(text);
             char[] textCharArray = text.toCharArray();
             if (textCharArray.length > 0) {
                 paint.getTextBounds(textCharArray, 0, textCharArray.length, viewRect);
                 charWidth = paint.measureText(textCharArray, textCharArray.length - 1, 1);
             }
     
             while (layoutWidth - drawedWidth < charWidth) {
                 if (getTextSize()  <= DEFAULT_MIN_TEXTSIZE) {
                     StringBuilder builder = new StringBuilder();
                     for (char chars : textCharArray) {
                         builder.append(chars);
                         float visibleTextWidth = paint.measureText(builder.toString() + "...");
                         if (layoutWidth - visibleTextWidth < 1.5 * charWidth) {
                             text = builder.append("...").toString();
                             char[] chars1 = text.toCharArray();
                             paint.getTextBounds(chars1, 0, chars1.length, viewRect);
                             break;
                         }
                     } break;
                 }
                 paint.setTextSize(getTextSize() - 1);
                 drawedWidth = paint.measureText(text);
                 if(textCharArray.length > 0)
                     charWidth = paint.measureText(textCharArray, textCharArray.length - 1, 1);
             }
     
     
             float startY = height -(height- viewRect.height()) * 0.5f;
             paint.setColor(textColor);
             if (centerHorization) {
                 canvas.drawText(text, Math.abs(layoutWidth - viewRect.width()) / 2 , startY, paint);
             } else if (alignLeft) {
                 canvas.drawText(text, 5, startY, paint);
             } else {
                 int startX = layoutWidth - viewRect.width();
                 if (startX < 0)
                     startX = 0;
                 canvas.drawText(text, startX, startY, paint);
             }
         }
     
         private void init(AttributeSet attrs) {
             if (!isInEditMode()) {
     
                 String resource = attrs.getAttributeValue("http://schemas.android.com/apk/res/android", "textColor");
                 if (!TextUtils.isEmpty(resource)) {
                     if (resource.contains("@")) {
                         textColor = getContext().getResources().getColor(Integer.valueOf(resource.substring(1, resource.length())));
                     } else {
                         textColor = Color.parseColor(resource);
                     }
                 }
     
                 TypedArray typedArray =
                         getContext().obtainStyledAttributes(attrs, R.styleable.AutoStretchTextView);
                 DEFAULT_MIN_TEXTSIZE =
                         typedArray.getDimension(R.styleable.AutoStretchTextView_default_min_textsize,
                                 DEFAULT_MIN_TEXTSIZE);
                 typedArray.recycle();
                 int font = attrs.getAttributeIntValue("http://schemas.android.com/apk/res-auto", "font",
                         0);
                 getPaint().setTypeface(FontUtil.getInstance().getFontTypeface(getContext(), font));
     
                 centerHorization =
                         attrs.getAttributeBooleanValue("http://schemas.android.com/apk/res-auto",
                                 "centerHorization", false);
                 alignLeft =
                         attrs.getAttributeBooleanValue("http://schemas.android.com/apk/res-auto",
                                 "alignLeft", false);
             }
         }
     
     
     }
     

     在 attr.xml中设置自定义的属性，用于设置最小字体，绘制字体是居中或巨左，默认是居右绘制的

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     7.  
     8.