自定义View控件解决android文字排版和换行的问题

冷不防 2022-04-23 13:24 245阅读 0赞

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import java.util.Vector;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.util.AttributeSet;import android.view.View;import android.view.WindowManager;import android.widget.LinearLayout;import android.widget.TextView;public class MyView extends TextView \{private final String namespace="http://www.nearmobile.net";private int resourceId=0;/\* 声明Paint对象 \*/private Paint mPaint = null;/\* 声明TextUtil对象 \*/private TextUtil mTextUtil = null;public static int m\_iTextHeight;private WindowManager wm=null;private String string=""; public MyView(Context context, AttributeSet set) \{ super(context,set); resourceId=set.getAttributeResourceValue(namespace, "text", 0); if(resourceId==0) string=set.getAttributeValue(null,"text"); else string=this.getResources().getString(resourceId); wm=(WindowManager)context.getSystemService(Context.WINDOW\_SERVICE); /\* 构建对象 \*/ m\_iTextHeight=2000; mPaint = new Paint(); mPaint.setColor(Color.RED); mPaint.setStrokeWidth(40); mPaint.setTextSize(20); int m\_iTextWidth=wm.getDefaultDisplay().getWidth(); FontMetrics fm = mPaint.getFontMetrics(); int m\_iFontHeight = (int) Math.ceil(fm.descent - fm.top) + 4; int line=0; int istart=0; int w=0; for (int i = 0; i < string.length(); i++) \{ char ch = string.charAt(i); float\[\] widths = new float\[1\]; String srt = String.valueOf(ch); mPaint.getTextWidths(srt, widths); if (ch == '/n') \{ line++; istart = i + 1; w = 0; \} else \{ w += (int) (Math.ceil(widths\[0\])); if (w > m\_iTextWidth) \{ line++; istart = i; i--; w = 0; \} else \{ if (i == (string.length() - 1)) \{ line++; \} \} \} \} m\_iTextHeight=(line+2)\*m\_iFontHeight+2; //用反射机制得到 m\_iTextHeight 值 /\* 实例化TextUtil mTextUtil = new TextUtil(string,5,25,wm.getDefaultDisplay().getWidth(),this.getHeight(),0x0,0xffffff,255,15); 初始化TextUtil mTextUtil.InitText(string,5,25,wm.getDefaultDisplay().getWidth(),wm.getDefaultDisplay().getHeight(),0x0,0xffffff,255,15);\*/ \} @Override protected void onDraw(Canvas canvas) \{ super.onDraw(canvas); /\* 设置背景颜色 \*/ canvas.drawColor(Color.BLACK); mPaint.setAntiAlias(true); char ch; int w = 0; int istart = 0; int m\_iFontHeight; int m\_iRealLine=0; int x=2; int y=60; Vector m\_String=new Vector(); int m\_iTextWidth=wm.getDefaultDisplay().getWidth(); FontMetrics fm = mPaint.getFontMetrics(); m\_iFontHeight = (int) Math.ceil(fm.descent - fm.top) + 4; //m\_ipageLineNum = m\_iTextHeight / m\_iFontHeight; for (int i = 0; i < string.length(); i++) \{ ch = string.charAt(i); float\[\] widths = new float\[1\]; String srt = String.valueOf(ch); mPaint.getTextWidths(srt, widths); if (ch == '/n') \{ m\_iRealLine++; m\_String.addElement(string.substring(istart, i)); istart = i + 1; w = 0; \} else \{ w += (int) (Math.ceil(widths\[0\])); if (w > m\_iTextWidth) \{ m\_iRealLine++; m\_String.addElement(string.substring(istart, i)); istart = i; i--; w = 0; \} else \{ if (i == (string.length() - 1)) \{ m\_iRealLine++; m\_String.addElement(string.substring(istart, string.length())); \} \} \} \} m\_iTextHeight=m\_iRealLine\*m\_iFontHeight+2; System.out.println("m\_iTextHeight----->"+m\_iTextHeight); canvas.setViewport(m\_iTextWidth, m\_iTextWidth); for (int i = 0, j = 0; i < m\_iRealLine; i++, j++) \{ canvas.drawText((String) (m\_String.elementAt(i)), x, y+m\_iFontHeight \* j, mPaint); \} \} protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) \{ int measuredHeight = measureHeight(heightMeasureSpec); int measuredWidth = measureWidth(widthMeasureSpec); this.setMeasuredDimension(measuredWidth, measuredHeight); this.setLayoutParams(new LinearLayout.LayoutParams(measuredWidth,measuredHeight)); super.onMeasure(widthMeasureSpec, heightMeasureSpec); \} private int measureHeight(int measureSpec) \{ int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); // Default size if no limits are specified. int result = m\_iTextHeight; if (specMode == MeasureSpec.AT\_MOST) \{ // Calculate the ideal size of your // control within this maximum size. // If your control fills the available // space return the outer bound. result = specSize; \} else if (specMode == MeasureSpec.EXACTLY) \{ // If your control can fit within these bounds return that value. result = specSize; \} return result; \} private int measureWidth(int measureSpec) \{ int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); // Default size if no limits are specified. int result = 500; if (specMode == MeasureSpec.AT\_MOST) \{ // Calculate the ideal size of your control // within this maximum size. // If your control fills the available space // return the outer bound. result = specSize; \} else if (specMode == MeasureSpec.EXACTLY) \{ // If your control can fit within these bounds return that value. result = specSize; \} return result; \}\}

[https_blog.csdn.net_jiangjunshow]: https://blog.csdn.net/jiangjunshow/article/details/77338485