Android 自定义TextView去除paddingTop和paddingBottom

android 自定义textview去除paddingtop和paddingbottom

最近项目中需要用libgdx渲染一个android的textview， 但是绘制出来的textview总是默认带有paddingtop和paddingbottom， 如下图所示：

网上有很多解决方案，例如在xml中设置如下属性：

android:linespacingmultiplier="0.8"
android:includefontpadding="false"

或者设置margin为负值等等。 但是以上方法在6.0之后都没什么卵用。

只有一种方法可以做到，就是自定义textview

package com.ef.smallstar.common.widget;

import android.content.context;
import android.graphics.canvas;
import android.graphics.paint;
import android.graphics.rect;
import android.support.annotation.nonnull;
import android.util.attributeset;

/**
 * created by danny on 17/8/28.
 *
 * this is a android textview without padding top & padding bottom
 */

public class textviewwithoutpadding extends android.support.v7.widget.appcompattextview {

  private final paint mpaint = new paint();

  private final rect mbounds = new rect();

  public textviewwithoutpadding(context context) {
    super(context);
  }

  public textviewwithoutpadding(context context, attributeset attrs) {
    super(context, attrs);
  }

  public textviewwithoutpadding(context context, attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);
  }

  @override
  protected void ondraw(@nonnull canvas canvas) {
    final string text = calculatetextparams();

    final int left = mbounds.left;
    final int bottom = mbounds.bottom;
    mbounds.offset(-mbounds.left, -mbounds.top);
    mpaint.setantialias(true);
    mpaint.setcolor(getcurrenttextcolor());
    canvas.drawtext(text, -left, mbounds.bottom - bottom, mpaint);
  }

  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);
    calculatetextparams();
    setmeasureddimension(mbounds.width() + 1, -mbounds.top + 1);
  }

  private string calculatetextparams() {
    final string text = gettext().tostring();
    final int textlength = text.length();
    mpaint.settextsize(gettextsize());
    mpaint.gettextbounds(text, 0, textlength, mbounds);
    if (textlength == 0) {
      mbounds.right = mbounds.left;
    }
    return text;
  }
}

如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！