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通用情况下，我们都是用TextView的横向排列，但有时候需求需要用到纵向排列，此时就傻眼了，本人也因此摘了两篇文章，供参考：
1、仅文字方向纵向排列，文字并没有翻转
public class VerticalTextView extends TextView{ final boolean topDown; public VerticalTextView(Context context, AttributeSet attrs){ super(context, attrs); final int gravity = getGravity(); if(Gravity.isVertical(gravity) && (gravity&Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) { setGravity((gravity&Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP); topDown = false; }else topDown = true; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){ super.onMeasure(heightMeasureSpec, widthMeasureSpec); setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth()); } @Override protected boolean setFrame(int l, int t, int r, int b){ return super.setFrame(l, t, l+(b-t), t+(r-l)); } @Override public void draw(Canvas canvas){ if(topDown){ canvas.translate(getHeight(), 0); canvas.rotate(90); }else { canvas.translate(0, getWidth()); canvas.rotate(-90); } canvas.clipRect(0, 0, getWidth(), getHeight(), android.graphics.Region.Op.REPLACE); super.draw(canvas); } } |
2、文字正常的纵向排列（真实需求）
public class TextViewVertical 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 TextViewVertical(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public TextViewVertical(Context context,AttributeSet attrs) { super(context, attrs); matrix = new Matrix(); paint = new Paint();//新建画笔 paint.setTextAlign(Align.CENTER);//文字居中 paint.setAntiAlias(true);//平滑处理 paint.setColor(Color.BLUE);//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); } } } } //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); }
FontMetrics fm = paint.getFontMetrics(); mFontHeight = (int) (Math.ceil(fm.descent - fm.top) * 1.0);// 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); 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; } } |
有空的亲，请自己测试一下！
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