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TextView的纵向排列

2015-08-14 10:18 525 查看

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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标签： TextView的纵向排列 TextViewVertical

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