如何勾勒出一个TextView？ [英] How to outline a TextView?

问题描述

我想做的事情是什么？（蓝色将被改变为白色）

我所做的？
我发现它扩展TextView的是能够勾勒出的TextView非常接近我想要的一类。问题是，我不能笔触颜色更改为任何颜色，它总是绘制为黑色。如何设置边框颜色为白色？

什么是我的输出：

哪里是我的codeS？

 公共类TypeFaceTextView扩展TextView的{

私人静电漆getWhiteBorderPaint（）{
    涂料P =新的油漆（Color.WHITE）;
    返回磷;
}

私有静态最后的油漆BLACK_BORDER_PAINT = getWhiteBorderPaint（）;

静态{
    BLACK_BORDER_PAINT.setXfermode（新PorterDuffXfermode（PorterDuff.Mode.DST_OUT））;
}

@覆盖
公共无效的setText（CharSequence的文字，BufferType型）{

    super.setText（的String.Format（text.toString（）），类型）;
}

私有静态最终诠释BORDER_WIDTH = 1;

私人字样字样;

公共TypeFaceTextView（上下文的背景下）{
    超（上下文）;
}

公共TypeFaceTextView（上下文的背景下，ATTRS的AttributeSet）{
    超（背景下，ATTRS）;

    setDrawingCacheEnabled（假）;

    setTypeface（ATTRS）;
}

私人无效setTypeface（AttributeSet中的ATTRS）{
    最后弦乐typefaceFileName = attrs.getAttributeValue（NULL，字体）;
    如果（typefaceFileName！= NULL）{
        字体= Typeface.createFromAsset（的getContext（）getAssets（），typefaceFileName）;
    }

    setTypeface（字体）;
}

公共TypeFaceTextView（上下文的背景下，ATTRS的AttributeSet，诠释defStyle）{
    超（背景下，ATTRS，defStyle）;

    setTypeface（ATTRS）;
}

@覆盖
公共无效画（油画aCanvas）{
    aCanvas.saveLayer（NULL，BLACK_BORDER_PAINT，Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
            | Canvas.FULL_COLOR_LAYER_SAVE_FLAG | Canvas.MATRIX_SAVE_FLAG）;

    drawBackground（aCanvas，-BORDER_WIDTH，-BORDER_WIDTH）;
    drawBackground（aCanvas，BORDER_WIDTH + BORDER_WIDTH，0）;
    drawBackground（aCanvas，0，BORDER_WIDTH + BORDER_WIDTH）;
    drawBackground（aCanvas，-BORDER_WIDTH  -  BORDER_WIDTH，0）;

    aCanvas.restore（）;
    super.draw（aCanvas）;

}

私人无效drawBackground（帆布aCanvas，诠释ADX，诠释ADY）{
    aCanvas.translate（ADX，ADY）;
    super.draw（aCanvas）;
}
}
 

解决方案

1）创建TextView的对象扩展的TextView

 公共类YourTextView扩展的TextView {.........
 

2）执行此操作在其绘制方法

  @覆盖
公共无效画（油画画布）{
        的for（int i = 0;我小于5;我++）{
        super.draw（画布）;
    }
}
 

3）设定的TextView的XML侧面，如下

 安卓则shadowColor =@色/白
机器人：shadowRadius =5
 

What I want to do? (blue will be changed as white)

What I did?
I have found a class which extends TextView that able to outline textview very close to what I want. The problem is that I could not change stroke color to any color, it draws always as black. How to set border color as white?

What is my output:

Where are my codes?

public class TypeFaceTextView extends TextView {

private static Paint getWhiteBorderPaint(){
    Paint p = new Paint(Color.WHITE);
    return p;
}

private static final Paint BLACK_BORDER_PAINT = getWhiteBorderPaint();

static {
    BLACK_BORDER_PAINT.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
}

@Override
public void setText(CharSequence text, BufferType type) {

    super.setText(String.format(text.toString()), type);
}

private static final int BORDER_WIDTH = 1;

private Typeface typeface;

public TypeFaceTextView(Context context) {
    super(context);
}

public TypeFaceTextView(Context context, AttributeSet attrs) {
    super(context, attrs);

    setDrawingCacheEnabled(false);

    setTypeface(attrs);
}

private void setTypeface(AttributeSet attrs) {
    final String typefaceFileName = attrs.getAttributeValue(null, "typeface");
    if (typefaceFileName != null) {
        typeface = Typeface.createFromAsset(getContext().getAssets(), typefaceFileName);
    }

    setTypeface(typeface);
}

public TypeFaceTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    setTypeface(attrs);
}

@Override
public void draw(Canvas aCanvas) {
    aCanvas.saveLayer(null, BLACK_BORDER_PAINT, Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
            | Canvas.FULL_COLOR_LAYER_SAVE_FLAG | Canvas.MATRIX_SAVE_FLAG);

    drawBackground(aCanvas, -BORDER_WIDTH, -BORDER_WIDTH);
    drawBackground(aCanvas, BORDER_WIDTH + BORDER_WIDTH, 0);
    drawBackground(aCanvas, 0, BORDER_WIDTH + BORDER_WIDTH);
    drawBackground(aCanvas, -BORDER_WIDTH - BORDER_WIDTH, 0);

    aCanvas.restore();
    super.draw(aCanvas);

}

private void drawBackground(Canvas aCanvas, int aDX, int aDY) {
    aCanvas.translate(aDX, aDY);
    super.draw(aCanvas);
}
}

解决方案

1) create your textview object extends TextView

public class YourTextView extends TextView { .........

2) Do this on its draw method

@Override
public void draw(Canvas canvas) {
        for (int i = 0; i < 5; i++) {
        super.draw(canvas);
    }
}

3) set textview's xml side as below

android:shadowColor="@color/white"
android:shadowRadius="5"

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