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package com.liao.intentservice;
import java.util.Arrays;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
public class AutoText extends View {
private Paint mPaint = new Paint();
public AutoText(Context context) {
this(context,null);
}
public AutoText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public AutoText(Context context, AttributeSet attrs) {
this(context,attrs,0);
}
private void init() {
mPaint.setAntiAlias(true);
mPaint.setColor(Color.RED);
mPaint.setStyle(Style.STROKE);
mPaint.setTextSize(getRawSize(TypedValue.COMPLEX_UNIT_DIP, 15));
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//setMeasuredDimension(300, 200);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//view.draw()绘制了控件的背景
//控件的绘制操作及顺序:
/*
* Draw traversal performs several drawing steps which must be executed
* in the appropriate order:
*
* 1. Draw the background (绘制控件设置的背景)
* 2. If necessary, save the canvas' layers to prepare for fading
* 3. Draw view's content (可以重写, onDraw(canvas);)
* 4. Draw children (可重写,用来分发画布到子控件,具体看ViewGroup。对应方法dispatchDraw(canvas);此方法依次调用了子控件的draw()方法)
* 5. If necessary, draw the fading edges and restore layers (绘制控件四周的阴影渐变效果)
* 6. Draw decorations (scrollbars for instance) (用来绘制滚动条,对应方法onDrawScrollBars(canvas);。
* 可以重写onDrawHorizontalScrollBar()和onDrawVerticalScrollBar()来自定义滚动条)
*/
//可以绘制内容和滚动条。
//draw backgroud
canvas.drawColor(Color.WHITE);
//draw text
FontMetrics fm = mPaint.getFontMetrics();
float baseline = fm.descent - fm.ascent;
float x = 0;
float y = baseline; //由于系统基于字体的底部来绘制文本,所有需要加上字体的高度。
//String txt = getResources().getString("asda");
String txt = "计算机科学或相关专业领域的本科及以上学历, 并有2年以上相关工作经验;2、在计算机技术领域拥有扎实的技术功底,尤其在数据结构、算法和代码、软件设计方面功力深厚;" +
"+3、熟悉分布式计算、网络系统设计,数据库设计和大规模存储系统,娴熟的C/C++编程技巧"+
"4、熟悉HTTP协议,开发基于HTTP协议的应用;有联网应用、联网游戏开发经验者优先"+
"5、具备Web service/Ajax/JavaScript/Apache/Tomcat/Struts/iBatis/Spring/PHP/JSP/Python等方面经验者优先考虑;"+
"6、熟悉TCP/IP协议,熟悉socket和多线程开发,具备高访问量网络开发工作经验。";
//文本自动换行
String[] texts = autoSplit(txt, mPaint, getWidth() - 5);
System.out.printf("line indexs: %s\n", Arrays.toString(texts));
for(String text : texts) {
canvas.drawText(text, x, y, mPaint); //坐标以控件左上角为原点
y += baseline + fm.leading; //添加字体行间距
}
}
/**
* 自动分割文本
* @param content 需要分割的文本
* @param p 画笔,用来根据字体测量文本的宽度
* @param width 指定的宽度
* @return 一个字符串数组,保存每行的文本
*/
private String[] autoSplit(String content, Paint p, float width) {
int length = content.length();
float textWidth = p.measureText(content);
if(textWidth <= width) {
return new String[]{content};
}
int start = 0, end = 1, i = 0;
int lines = (int) Math.ceil(textWidth / width); //计算行数
String[] lineTexts = new String[lines];
while(start < length) {
if(p.measureText(content, start, end) > width) { //文本宽度超出控件宽度时
lineTexts[i++] = (String) content.subSequence(start, end);
start = end;
}
if(end == length) { //不足一行的文本
lineTexts[i] = (String) content.subSequence(start, end);
break;
}
end += 1;
}
return lineTexts;
}
/**
* 获取指定单位对应的原始大小(根据设备信息)
* px,dip,sp -> px
*
* Paint.setTextSize()单位为px
*
*
*
* 代码摘自:TextView.setTextSize()
*
* @param unit TypedValue.COMPLEX_UNIT_*
* @param size
* @return
*/
public float getRawSize(int unit, float size) {
Context c = getContext();
Resources r;
if (c == null)
r = Resources.getSystem();
else
r = c.getResources();
return TypedValue.applyDimension(unit, size, r.getDisplayMetrics());
}
}
转自:
http://blog.csdn.net/liao3841054/article/details/7165708
分享到:
2012-08-10 16:44
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