标签:
public class TextDrawView extends View { private int textColor = 0xffafafaf; private float textSize = 12; private String textToDraw = ""; private List<String> textLines=new ArrayList<String>(); private float lineMul=1.3f; TextPaint textPaint; public TextDrawView(Context context) { super(context); init(); } public TextDrawView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public TextDrawView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } public void init() { textPaint = new TextPaint(); textPaint.setAntiAlias(true); setTextColor(textColor); setTextSize(textSize); } public void setTextColor(int textColor) { this.textColor = textColor; textPaint.setColor(textColor); } /** * 单位sp */ public void setTextSize(float textSize) { Context context = this.getContext(); Resources r = Resources.getSystem(); if (context != null) { r = context.getResources(); } this.textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, textSize, r.getDisplayMetrics()); textPaint.setTextSize(this.textSize); } public void setText(String textToDraw) { if (textToDraw == null) { return; } this.textToDraw = textToDraw; invalidate(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { LogUtils.i("neal", "onmeasure"); super.onMeasure(widthMeasureSpec, heightMeasureSpec); textLines.clear(); while (textToDraw.length() > 0) { int size = textPaint.breakText(textToDraw, true, getMeasuredWidth(), null); textLines.add(textToDraw.substring(0, size)); textToDraw = textToDraw.substring(size); } int width, height; int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); if (widthMode == MeasureSpec.EXACTLY) { width = widthSize; } else { width = getMeasuredWidth(); } if (heightMode == MeasureSpec.EXACTLY) { height = heightSize; } else { height = textLines.size()*(int)(textPaint.getTextSize()*lineMul)+1; } setMeasuredDimension(width, height); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); } @Override protected void onDraw(Canvas canvas) { LogUtils.i("neal", "ondraw"); float x=0; float y=textPaint.getTextSize(); for(String text:textLines){ canvas.drawText(text,x,y,textPaint); y=y+textPaint.getTextSize()*lineMul; } } }很简单的原理,就是自己用canvas去drawtext.
版权声明:本文为博主原创文章,未经博主允许不得转载。
标签:
原文地址:http://blog.csdn.net/sddyljsx/article/details/48008567