Android 中TextView文字描边实现（一）

Android 9.0效果图：

Android 10.0效果图：

据以上两图显示此方法只用于android9.0可行，第二种方法见Android 中TextView文字描边实现（二）

1.attrs.xml文件

<?xml version="1.0" encoding="utf-8"?> <resources> <!-- 自定义控件的名称 --> <declare-styleable name="StrokeTextView"> <!-- 自定义的属性名称 和对应的单位 --> <attr name="outerColor" format="color|reference" /> <attr name="innnerColor" format="color|reference" /> </resources>

2.StrokeTextView的实现

package com.app.animalchess.widget; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.text.TextPaint; import android.util.AttributeSet; import android.widget.TextView; import com.app.animalchess.R; import java.lang.reflect.Field; /** * @Author : XiaoXred * @Time : On 2020/10/22 15:59 * @Description : StrokeTextView 文字内容有描边的TextView */ public class StrokeTextViewextends TextView { TextPaintm_TextPaint; int mInnerColor; int mOuterColor; public StrokeTextView(Context context,int outerColor,int innnerColor) { super(context); m_TextPaint =this.getPaint(); this.mInnerColor = innnerColor; this.mOuterColor = outerColor; // TODO Auto-generated constructor stub } public StrokeTextView(Context context, AttributeSet attrs) { super(context, attrs); m_TextPaint =this.getPaint(); //获取自定义的XML属性名称 TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.StrokeTextView); //获取对应的属性值 this.mInnerColor = a.getColor(R.styleable.StrokeTextView_innnerColor,0xffffff); this.mOuterColor = a.getColor(R.styleable.StrokeTextView_outerColor,0xffffff); } public StrokeTextView(Context context, AttributeSet attrs, int defStyle,int outerColor,int innnerColor) { super(context, attrs, defStyle); m_TextPaint =this.getPaint(); this.mInnerColor = innnerColor; this.mOuterColor = outerColor; // TODO Auto-generated constructor stub } private boolean m_bDrawSideLine =true; // 默认采用描边 /** * */ @Override protected void onDraw(Canvas canvas) { if (m_bDrawSideLine) { // 描外层 // super.setTextColor(Color.BLUE); // 不能直接这么设，如此会导致递归 // setTextColorUseReflection(Color.YELLOW); setTextColorUseReflection(getResources().getColor(R.color.color_CC7B02)); m_TextPaint.setStrokeWidth(10); // 描边宽度 m_TextPaint.setStyle(Paint.Style.FILL_AND_STROKE); // 描边种类 m_TextPaint.setFakeBoldText(true); // 外层text采用粗体 //radius：阴影半径 dx：X轴方向的偏移量 dy：Y轴方向的偏移量 color：阴影颜色 m_TextPaint.setShadowLayer(5, 0,0,0); // 字体的阴影效果，可以忽略 super.onDraw(canvas); // 描内层，恢复原先的画笔 // super.setTextColor(Color.BLUE); // 不能直接这么设，如此会导致递归 setTextColorUseReflection(Color.WHITE); m_TextPaint.setStrokeWidth(0); // m_TextPaint.setStyle(Style.FILL_AND_STROKE); m_TextPaint.setFakeBoldText(false); m_TextPaint.setShadowLayer(0, 0, 0, 0); } super.onDraw(canvas); } /** * 使用反射的方法进行字体颜色的设置 * @param color */ private void setTextColorUseReflection(int color) { Field textColorField; try { textColorField = TextView.class.getDeclaredField("mCurTextColor"); textColorField.setAccessible(true); textColorField.set(this, color); textColorField.setAccessible(false); }catch (NoSuchFieldException e) { e.printStackTrace(); }catch (IllegalArgumentException e) { e.printStackTrace(); }catch (IllegalAccessException e) { e.printStackTrace(); } m_TextPaint.setColor(color); } }

3.布局文件中StrokeTextView的使用

<com.app.animalchess.widget.StrokeTextView android:layout_width="260dp" android:layout_height="50dp" android:text="登录" android:background="@drawable/login_btn_wchat_nor" android:textSize="18sp" android:gravity="center" android:layout_marginTop="140dp" android:layout_gravity="center" app:outerColor="@color/color_CC7B02" app:innnerColor="@color/color_ffffff" />