Android TextView两端对齐解决办法

Android TextView两端对齐解决办法

今天遇到一个关于TextView文字两端对齐其实方案，大家都知道原生控件是不能满足我们的需求的，因此需要自定义View

下面看下效果图

package com.example.VerticalMarqueeTextView.view;import Android.content.Context;import android.graphics.canvas;import android.graphics.Paint;import android.text.TextPaint;import android.text.TextUtils;import android.util.AttributeSet;import android.view.ViewGroup;import android.view.ViewTreeObserver;import android.widget.TextView;public class WordAlignTextView extends TextView {  private float textSize;  private float textLineHeight;  //顶部  private int top;  //y轴  private int y;  //线  private int lines;  //底部  private int bottom;  //右边  private int right;  //左边  private int left;  //线字  private int lineDrawWords;  private char[] textCharArray;  private float singleWordWidth;   //每个字符的空隙  private float lineSpacingExtra;  private boolean isFirst = true;  public WordAlignTextView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {      @Override      public boolean onPreDraw() {        initTextInfo();        return true;      }    });  }  public WordAlignTextView(Context context, AttributeSet attrs) {    this(context, attrs, 0);  }  public WordAlignTextView(Context context) {    this(context, null, 0);  }  public void initTextInfo() {    textSize = getTextSize();    //获取线的高度    textLineHeight = getLineHeight();    left = 0;    right = getRight();    y = getTop();    // 要画的宽度    int drawTotalWidth = right - left;    String text = getText().toString();    if (!TextUtils.isEmpty(text) && isFirst) {      textCharArray = text.toCharArray();      TextPaint mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);      mTextPaint.density = getResources().getDisplayMetrics().density;      mTextPaint.setTextSize(textSize);      // 获取单个单词的的宽度      singleWordWidth = mTextPaint.measureText("一") + lineSpacingExtra;      // 每行可以放多少个字符      lineDrawWords = (int) (drawTotalWidth / singleWordWidth);      int length = textCharArray.length;      lines = length / lineDrawWords;      if ((length % lineDrawWords) > 0) {        lines = lines + 1;      }      first = false;      ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) getLayoutParams();      int totalHeight = (int) (lines*textLineHeight+textLineHeight*2 + getPaddingBottom()+getPaddingTop()+layoutParams.bottomMargin+layoutParams.topMargin);      setHeight(totalHeight);    }  }  @Override  protected void onDraw(Canvas canvas) {    bottom = getBottom();    int drawTotalLine = lines;    if(maxLine!=0&&drawTotalLine>maxLine){      drawTotalLine = maxLine;    }    for (int i = 0; i < drawTotalLine; i++) {      try {        int length = textCharArray.length;        int mLeft = left;        // 第i+1行开始的字符index        int startIndex = (i * 1) * lineDrawWords;        // 第i+1行结束的字符index        int endTextIndex = startIndex + lineDrawWords;        if (endTextIndex > length) {          endTextIndex = length;          y += textLineHeight;        } else {          y += textLineHeight;        }        for (; startIndex < endTextIndex; startIndex++) {          char c = textCharArray[startIndex];//     if (c == ' ') {//      c = '\u3000';//     } else if (c < '\177') {//      c = (char) (c + 65248);//     }          canvas.drawText(String.valueOf(c), mLeft, y, getPaint());          mLeft += singleWordWidth;        }      } catch (Exception e) {        e.printStackTrace();      }    }  }  int maxLine;  public void setMaxLines(int max){    this.maxLine = max;  }  public void setLineSpacingExtra(int lineSpacingExtra){    this.lineSpacingExtra = lineSpacingExtra;  }    public static boolean containChinese(String string){    boolean flag = false;    for (int i = 0; i < string.length(); i++) {      char c = string.charAt(i);      if ((c >= 0x4e00) && (c <= 0x9FA5)) {        flag = true;      }    }    return flag;  }  public static String ToDBC(String input) {    // 导致TextView异常换行的原因：安卓默认数字、字母不能为第一行以后每行的开头字符，因为数字、字母为半角字符    // 所以我们只需要将半角字符转换为全角字符即可    char c[] = input.toCharArray();    for (int i = 0; i < c.length; i++) {      if (c[i] == ' ') {        c[i] = '\u3000';      } else if (c[i] < '\177') {        c[i] = (char) (c[i] + 65248);      }    }    return new String(c);  }}