Android重写TextView实现文字整齐排版的方法(附demo源码下载)

本文实例讲述了android重写textview实现文字整齐排版的方法。分享给大家供大家参考，具体如下：

xrtextview类

package rong.android.test;
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 = "rong.android.textview";
 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", 25);//字体大小
 textcolor = attrs.getattributeintvalue(namespace, "textcolor",color.blue);//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, int textcolor, 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;
 }
 /**
 * 传入一个索引，判断当前字是否被高亮
 * @param index
 * @return
 * @throws jsonexception 
 */
 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;
 }
 @override
 protected void ondraw(canvas canvas) {
// super.ondraw(canvas);
 view view=(view)this.getparent();
 textshowwidth=view.getmeasuredwidth()-paddingleft - paddingright - marginleft - marginright;
 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 block
  e1.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);
 }
}

mainactivity类

package rong.android.test;
import android.os.bundle;
import android.widget.textview;
import android.app.activity;
public class mainactivity extends activity {
 private xrtextview xrtextview = null;
 private textview textview = null;
 private string content = "abcdefgabcdef我要你lfwjkdfl;skjf asljkflskjfls;kjfsljfwfisdlfjsllkjsdfjlskjf546132s1f3sd4f31s3dffslfksjdfljlsadkjflsajdf sdfjklsajdflsa;jdfls 的!@#$%^&*()_";
 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);
 xrtextview = (xrtextview) this.findviewbyid(r.id.mytextview_tv);
 xrtextview.settext(content);
 textview = (textview) this.findviewbyid(r.id.mytextview_tv1);
 textview.settext(content);
 }
}

布局文件

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" >
  <rong.android.test.xrtextview
    android:id="@+id/mytextview_tv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
  <textview
    android:id="@+id/mytextview_tv1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textcolor="@android:color/black" />
</linearlayout>

完整实例代码点击此处本站下载。

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希望本文所述对大家android程序设计有所帮助。