Android实现竖直显示的TextView【转载】

转载自：http://hz-chenwenbiao-91.iteye.com/blog/2089851  

感觉写的很好，特此转载记录下。但是我发现这个哥们也是转的，原文出处已经找不到在哪儿了。

public class VerticalTextView extends View {    public static final int LAYOUT_CHANGED = 1;    PRivate Paint paint;    private int mTextPosx = 0;// x坐标    private int mTextPosy = 0;// y坐标    private int mTextWidth = 0;// 绘制宽度    private int mTextHeight = 0;// 绘制高度    private int mFontHeight = 0;// 绘制字体高度    private float mFontSize = 24;// 字体大小    private int mRealLine = 0;// 字符串真实的行数    private int mLineWidth = 0;//列宽度    private int TextLength = 0;//字符串长度    private int oldwidth = 0;//存储久的width    private String text = "";//待显示的文字    private Handler mHandler = null;    private Matrix matrix;    BitmapDrawable drawable = (BitmapDrawable) getBackground();    public VerticalTextView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    public VerticalTextView(Context context, AttributeSet attrs) {        super(context, attrs);        matrix = new Matrix();        paint = new Paint();//新建画笔        paint.setTextAlign(Paint.Align.CENTER);//文字居中        paint.setAntiAlias(true);//平滑处理        paint.setColor(Color.BLACK);//默认文字颜色        try {            mFontSize = Float.parseFloat(attrs.getAttributeValue(null, "textSize"));//获取字体大小属性        } catch (Exception e) {        }    }    /*    //获取整数值    private final int getAttributeIntValue(AttributeSet attrs,String field) {        int intVal = 0;        //TODO        //应该可以直接用attrs.getAttributeIntValue()获取对应的数值的，        //但不知道为什么一直无法获得只好临时写个函数凑合着用,没有写完整，暂时只支持px作为单位，其它单位的转换有空再写        String tempText=attrs.getAttributeValue(androidns, field);        intVal = (int)Math.ceil(Float.parseFloat(tempText.replaceAll("px","")));        return intVal;    }*/    //设置文字    public final void setText(String text) {        this.text = text;        this.TextLength = text.length();        if (mTextHeight > 0) GetTextInfo();    }    //设置字体大小    public final void setTextSize(float size) {        if (size != paint.getTextSize()) {            mFontSize = size;            if (mTextHeight > 0) GetTextInfo();        }    }    //设置字体颜色    public final void setTextColor(int color) {        paint.setColor(color);    }    //设置字体颜色    public final void setTextARGB(int a, int r, int g, int b) {        paint.setARGB(a, r, g, b);    }    //设置字体    public void setTypeface(Typeface tf) {        if (this.paint.getTypeface() != tf) {            this.paint.setTypeface(tf);        }    }    //设置行宽    public void setLineWidth(int LineWidth) {        mLineWidth = LineWidth;    }    //获取实际宽度    public int getTextWidth() {        return mTextWidth;    }    //设置Handler，用以发送事件    public void setHandler(Handler handler) {        mHandler = handler;    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Log.v("TextViewVertical", "onDraw");        if (drawable != null) {            //画背景            Bitmap b = Bitmap.createBitmap(drawable.getBitmap(), 0, 0, mTextWidth, mTextHeight);            canvas.drawBitmap(b, matrix, paint);        }        //画字        draw(canvas, this.text);    }    private void draw(Canvas canvas, String thetext) {        char ch;        mTextPosy = 0;//初始化y坐标        mTextPosx = mTextWidth - mLineWidth;//初始化x坐标        for (int i = 0; i < this.TextLength; i++) {            ch = thetext.charAt(i);            if (ch == '/n') {                mTextPosx -= mLineWidth;// 换列                mTextPosy = 0;            } else {                mTextPosy += mFontHeight;                if (mTextPosy > this.mTextHeight) {                    mTextPosx -= mLineWidth;// 换列                    i--;                    mTextPosy = 0;                } else {                    canvas.drawText(String.valueOf(ch), mTextPosx, mTextPosy, paint);                }            }        }        //调用接口方法        //activity.getHandler().sendEmptyMessage(TestFontActivity.UPDATE);    }    //计算文字行数和总宽    private void GetTextInfo() {        Log.v("TextViewVertical", "GetTextInfo");        char ch;        int h = 0;        paint.setTextSize(mFontSize);        //获得字宽        if (mLineWidth == 0) {            float[] widths = new float[1];            paint.getTextWidths("正", widths);//获取单个汉字的宽度            mLineWidth = (int) Math.ceil(widths[0] * 1.1 + 2);        }        Paint.FontMetrics fm = paint.getFontMetrics();        mFontHeight = (int) (Math.ceil(fm.descent - fm.top) * 0.9);// 获得字体高度        //计算文字行数        mRealLine = 0;        for (int i = 0; i < this.TextLength; i++) {            ch = this.text.charAt(i);            if (ch == '/n') {                mRealLine++;// 真实的行数加一                h = 0;            } else {                h += mFontHeight;                if (h > this.mTextHeight) {                    mRealLine++;// 真实的行数加一                    i--;                    h = 0;                } else {                    if (i == this.TextLength - 1) {                        mRealLine++;// 真实的行数加一                    }                }            }        }        mRealLine++;//额外增加一行        mTextWidth = mLineWidth * mRealLine;//计算文字总宽度        measure(mTextWidth, getHeight());//重新调整大小        layout(getLeft(), getTop(), getLeft() + mTextWidth, getBottom());//重新绘制容器    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int measuredHeight = measureHeight(heightMeasureSpec);        //int measuredWidth = measureWidth(widthMeasureSpec);        if (mTextWidth == 0) GetTextInfo();        setMeasuredDimension(mTextWidth, measuredHeight);        if (oldwidth != getWidth()) {//            oldwidth = getWidth();            if (mHandler != null) mHandler.sendEmptyMessage(LAYOUT_CHANGED);        }    }    private int measureHeight(int measureSpec) {        int specMode = MeasureSpec.getMode(measureSpec);        int specSize = MeasureSpec.getSize(measureSpec);        int result = 500;        if (specMode == MeasureSpec.AT_MOST) {            result = specSize;        } else if (specMode == MeasureSpec.EXACTLY) {            result = specSize;        }        mTextHeight = result;//设置文本高度        return result;    }    /*    private int measureWidth(int measureSpec) {        int specMode = MeasureSpec.getMode(measureSpec);        int specSize = MeasureSpec.getSize(measureSpec);        int result = 500;        if (specMode == MeasureSpec.AT_MOST){            result = specSize;        }else if (specMode == MeasureSpec.EXACTLY){            result = specSize;        }        return result;    }  */}用法是：
public class TestFontActivity extends Activity{      private HorizontalScrollView sv;      private TextViewVertical tv;        @Override      public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.main);                      tv=(TextViewVertical)findViewById(R.id.tv);             sv=(HorizontalScrollView)findViewById(R.id.sv);                        //设置接口事件接收           Handler handler=new Handler(){              public void handleMessage(android.os.Message msg) {                  switch(msg.what){                      case TextViewVertical.LAYOUT_CHANGED:                          sv.scrollBy(tv.getTextWidth(), 0);//滚动到最右边                          break;                  }              }           };           tv.setHandler(handler);//将Handler绑定到TextViewVertical                      //创建并设置字体（这里只是为了效果好看一些，但为了让网友们更容易下载，字体库并没有一同打包           //如果需要体验下效果的朋友可以自行在网络上搜索stxingkai.ttf并放入assets/fonts/中）           //Typeface face=Typeface.createFromAsset(getAssets(),"fonts/stxingkai.ttf");           //tv.setTypeface(face);                      //设置文字内容           tv.setText("测试/n这是一段测试文字，主要是为了测试竖直排版TextView的显示效果。" +                  "为了能更好的体验感受，我特意增加了比较接近书法的字体和颜色，如果有什么改进的建议请发邮件到我的邮箱吧。" +                  "/n竖直排版的TextView需要配合HorizontalScrollView使用才能有更佳的效果。当然，如果你有时间的话，也可以给这个类" +                  "加上滚动的功能。");      }    }