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; } }
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