[移动开发]能够自定义后缀的TextView

废话不多说。
此文章大部分参考了 https://github.com/TheCodeYard/EllipsizedTextView/blob/master/ellipsizedtextview/src/main/java/com/thecodeyard/ellipsizedtextview/EllipsizedTextView.kt 。改了一个小问题。
废话不多说上代码。
package com.example.testapplication;

import android.content.Context;
import android.content.res.TypedArray;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.style.ForegroundColorSpan;
import android.util.AttributeSet;

import androidx.appcompat.widget.AppCompatTextView;

/**

• see https://github.com/TheCodeYard/EllipsizedTextView/blob/master/ellipsizedtextview/src/main/java/com/thecodeyard/ellipsizedtextview/EllipsizedTextView.kt

• 通过kt改造
  */
  public class EllipsizedTextView extends AppCompatTextView {
  private SpannableString ellipsisSpannable;
  private SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder();
  String ellipsis;
  int ellipsisColor;
  private static final String ELLIPSIS_NORMAL = “\u2026”; // (…)

  public EllipsizedTextView(Context context) {
  this(context,null);
  }

  public EllipsizedTextView(Context context, AttributeSet attrs) {
  this(context, attrs,0);
  }

  public EllipsizedTextView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  init(context, attrs, defStyleAttr);

  }

  private void init(Context context, AttributeSet attrs, int defStyleAttr) {
  ellipsis = getDefaultEllipsis().toString();
  ellipsisColor = getDefaultEllipsisColor();
  if (attrs != null) {
  TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.EllipsizedTextView, 0, 0);
  ellipsis = typedArray.getString(R.styleable.EllipsizedTextView_ellipsis);
  ellipsisColor = typedArray.getColor(R.styleable.EllipsizedTextView_ellipsisColor, getDefaultEllipsisColor());
  typedArray.recycle();
  }

   ellipsisSpannable = new SpannableString(ellipsis);
   ellipsisSpannable.setSpan(new ForegroundColorSpan(ellipsisColor), 0, ellipsis.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
  

  }

  @Override
  public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  float availableScreenWidth = getMeasuredWidth() - getCompoundPaddingLeft() - getCompoundPaddingRight();
  float availableTextWidth = availableScreenWidth * getMaxLines();
  String ellipsizedText = TextUtils.ellipsize(getText(), getPaint(), availableTextWidth, getEllipsize()).toString();
  //如果裁剪后文字跟TextView文字不一致。需要执行替换逻辑。
  if (ellipsizedText.toString() != getText().toString()) {
  // If the ellipsizedText is different than the original text, this means that it didn’t fit and got indeed ellipsized.
  // Calculate the new availableTextWidth by taking into consideration the size of the custom ellipsis, too.
  //此处计算错误。应该是最后一行才有Ellipsize
  // availableTextWidth = (availableScreenWidth - getPaint().measureText(ellipsis)) * getMaxLines();
  if(getMaxLines()>=1) {
  availableTextWidth = availableScreenWidth * (getMaxLines() - 1) + (availableScreenWidth - getPaint().measureText(ellipsis));
  ellipsizedText = TextUtils.ellipsize(getText(), getPaint(), availableTextWidth, getEllipsize()).toString();
  int defaultEllipsisStart = ellipsizedText.indexOf(getDefaultEllipsis());
  int defaultEllipsisEnd = defaultEllipsisStart + 1;

           spannableStringBuilder.clear();
  
           // Update the text with the ellipsized version and replace the default ellipsis with the custom one.
           setText(spannableStringBuilder.append(ellipsizedText).replace(defaultEllipsisStart, defaultEllipsisEnd, ellipsisSpannable));
       }
   }
  

  }

  private String getDefaultEllipsis() {
  return ELLIPSIS_NORMAL;
  }

  private int getDefaultEllipsisColor() {
  return getTextColors().getDefaultColor();
  }
  }

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