android maxLines ellipsize 配合使用失效，解决办法

来源：互联网发布：淘宝达人个人介绍编辑：程序博客网时间：2024/05/05 01:39

首先，自定义一个TextView

package com.hx.readeralliance.customView;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.graphics.Canvas;import android.text.Layout;import android.text.Layout.Alignment;import android.text.StaticLayout;import android.text.TextUtils.TruncateAt;import android.util.AttributeSet;import android.widget.TextView;  public class EllipsizingTextView extends TextView {      private static final String ELLIPSIS = "...";        public interface EllipsizeListener {          void ellipsizeStateChanged(boolean ellipsized);      }        private final List<EllipsizeListener> ellipsizeListeners = new ArrayList<EllipsizeListener>();      private boolean isEllipsized;      private boolean isStale;      private boolean programmaticChange;      private String fullText;      private int maxLines = -1;      private float lineSpacingMultiplier = 1.0f;      private float lineAdditionalVerticalPadding = 0.0f;        public EllipsizingTextView(Context context) {          super(context);      }        public EllipsizingTextView(Context context, AttributeSet attrs) {          super(context, attrs);      }        public EllipsizingTextView(Context context, AttributeSet attrs, int defStyle) {          super(context, attrs, defStyle);      }        public void addEllipsizeListener(EllipsizeListener listener) {          if (listener == null) {              throw new NullPointerException();          }          ellipsizeListeners.add(listener);      }        public void removeEllipsizeListener(EllipsizeListener listener) {          ellipsizeListeners.remove(listener);      }        public boolean isEllipsized() {          return isEllipsized;      }        @Override      public void setMaxLines(int maxLines) {          super.setMaxLines(maxLines);          this.maxLines = maxLines;          isStale = true;      }        public int getMaxLines() {          return maxLines;      }        @Override      public void setLineSpacing(float add, float mult) {          this.lineAdditionalVerticalPadding = add;          this.lineSpacingMultiplier = mult;          super.setLineSpacing(add, mult);      }        @Override      protected void onTextChanged(CharSequence text, int start, int before, int after) {          super.onTextChanged(text, start, before, after);          if (!programmaticChange) {              fullText = text.toString();              isStale = true;          }      }        @Override      protected void onDraw(Canvas canvas) {          if (isStale) {              super.setEllipsize(null);              resetText();          }          super.onDraw(canvas);      }        private void resetText() {          int maxLines = getMaxLines();          String workingText = fullText;          boolean ellipsized = false;          if (maxLines != -1) {              Layout layout = createWorkingLayout(workingText);              if (layout.getLineCount() > maxLines) {                  workingText = fullText.substring(0, layout.getLineEnd(maxLines - 1)).trim();                  while (createWorkingLayout(workingText + ELLIPSIS).getLineCount() > maxLines) {                      int lastSpace = workingText.lastIndexOf(' ');                      if (lastSpace == -1) {                          break;                      }                      workingText = workingText.substring(0, lastSpace);                  }                  workingText = workingText + ELLIPSIS;                  ellipsized = true;              }          }          if (!workingText.equals(getText())) {              programmaticChange = true;              try {                  setText(workingText);              } finally {                  programmaticChange = false;              }          }          isStale = false;          if (ellipsized != isEllipsized) {              isEllipsized = ellipsized;              for (EllipsizeListener listener : ellipsizeListeners) {                  listener.ellipsizeStateChanged(ellipsized);              }          }      }        private Layout createWorkingLayout(String workingText) {          return new StaticLayout(workingText, getPaint(), getWidth() - getPaddingLeft() - getPaddingRight(),                  Alignment.ALIGN_NORMAL, lineSpacingMultiplier, lineAdditionalVerticalPadding, false);      }        @Override      public void setEllipsize(TruncateAt where) {          // Ellipsize settings are not respected       }  }

然后，在布局文件中引用该TextView

<com.hx.readeralliance.customView.EllipsizingTextView           android:id="@+id/tx_attention_des"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginBottom="@dimen/contentMarginBottom"        android:layout_marginLeft="@dimen/leftPadding"        android:layout_marginRight="@dimen/rightPadding"        android:layout_below="@+id/articlPic"        android:textColor="@color/index_content"        android:textSize="@dimen/index_content"/>

最后，在代码中设置最大的行数

viewHolder.txArticleDes.setMaxLines(5);viewHolder.txArticleDes.setEllipsize(TextUtils.TruncateAt.valueOf("END"));

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