Android重写textview排版

又遇textview排版问题，记录备忘一下～

import org.json.JSONArray;import org.json.JSONException;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;import android.widget.TextView;public class XRTextView extends TextView{private final String namespace ="http://schemas.android.com/apk/res/android";private String text;private float textSize;private float paddingLeft;private float paddingRight;private float marginLeft;private float marginRight;private int textColor;private JSONArray colorIndex;private Paint paint1 = new Paint();private Paint paintColor = new Paint();private float textShowWidth;private float Spacing = 0;private float LineSpacing = 1.3f;//行与行的间距public XRTextView(Context context, AttributeSet attrs) {super(context, attrs);text = attrs.getAttributeValue("http://schemas.android.com/apk/res/android", "text");textSize = attrs.getAttributeIntValue(namespace, "textSize",18);//字体大小textColor = attrs.getAttributeIntValue(namespace,"textColor",Color.BLACK);//字体颜色paddingLeft = attrs.getAttributeIntValue(namespace,"paddingLeft", 0);paddingRight = attrs.getAttributeIntValue(namespace,"paddingRight", 0);marginLeft = attrs.getAttributeIntValue(namespace,"marginLeft", 0);marginRight = attrs.getAttributeIntValue(namespace,"marginRight", 0);paint1.setTextSize(textSize);paint1.setColor(textColor);paint1.setAntiAlias(true);paintColor.setAntiAlias(true);paintColor.setTextSize(textSize);paintColor.setColor(Color.BLUE);}public XRTextView(Context context, float textSize, inttextColor, float paddingLeft, float paddingRight, float marginLeft,float marginRight){super(context);this.textSize = textSize;this.textColor = textColor;this.paddingLeft = paddingLeft;this.paddingRight = paddingRight;this.marginLeft = marginLeft;this.marginRight = marginRight;paint1.setTextSize(textSize);paint1.setColor(textColor);paint1.setAntiAlias(true); paintColor.setAntiAlias(true);paintColor.setTextSize(textSize);paintColor.setColor(Color.BLUE);}public JSONArray getColorIndex() {return colorIndex;}public void setColorIndex(JSONArray colorIndex) {this.colorIndex = colorIndex;}public boolean isColor(int index) throws JSONException{if(colorIndex == null){return false;}for(int i = 0 ; i < colorIndex.length() ; i++){JSONArray array = colorIndex.getJSONArray(i);int start = array.getInt(0);int end = array.getInt(1)-1;if(index >= start&& index <=end){return true;}}return false;}@Overrideprotected void onDraw(Canvas canvas) {// super.onDraw(canvas);View view=(View)this.getParent();textShowWidth=this.getMeasuredWidth()-paddingLeft -paddingRight;int lineCount = 0;text = this.getText().toString();//.replaceAll("\n","\r\n");if(text==null)return;char[] textCharArray = text.toCharArray();// 已绘的宽度float drawedWidth = 0;float charWidth;for (int i = 0; i < textCharArray.length; i++){charWidth = paint1.measureText(textCharArray, i, 1);if(textCharArray[i]=='\n'){lineCount++;drawedWidth = 0;continue;}if (textShowWidth - drawedWidth < charWidth){lineCount++;drawedWidth = 0;}boolean color = false;try {color = isColor(i);} catch (JSONException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}if(color){canvas.drawText(textCharArray, i, 1, paddingLeft +drawedWidth,(lineCount + 1) * textSize * LineSpacing, paintColor);}else{canvas.drawText(textCharArray, i, 1, paddingLeft +drawedWidth,(lineCount + 1) * textSize * LineSpacing, paint1);}if(textCharArray[i] > 127&& textCharArray[i] != '、'&& textCharArray[i] != '，'&& textCharArray[i] != '。'&& textCharArray[i] != '：'&& textCharArray[i] != '！'){drawedWidth += charWidth + Spacing;}else{drawedWidth += charWidth;}}setHeight((int) ((lineCount + 1) * (int) textSize *LineSpacing + 10));}public float getSpacing() {return Spacing;}public void setSpacing(float spacing) {Spacing = spacing;}public float getMYLineSpacing() {return LineSpacing;}public void setMYLineSpacing(float lineSpacing) {LineSpacing = lineSpacing;}public float getMYTextSize() {return textSize;}public void setMYTextSize(float textSize) {this.textSize = textSize;paint1.setTextSize(textSize);paintColor.setTextSize(textSize);}}

注：上面代码存在BUG，调用setHeight会导致刷新，从而重新调用ondraw，导致ondraw无限循环调用。应该在其他地方如（onlayout）中计算高度，然后setheight，并且在高度改变的时候重新计算（如settext）。