如何勾勒TextView？

Question

我想要做什麼？（藍色會變成白色）

我做了什麼？
我發現了一個擴展TextView的類，它能夠將textview放在非常接近我想要的位置的位置。問題是我無法將筆畫顏色更改爲任何顏色，它總是以黑色繪製。如何將邊框顏色設置爲白色？

什麼是我的輸出：

哪裏是我的代碼？

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); 
} 
} 

Answer 1

1）創建TextView的對象擴展的TextView

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

2）做這在其繪製方法

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

3）設置的TextView的XML側面，如下

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

Answer 2

無法此這一點，但嘗試嘗試：PorterDuff.Mode

http://developer.android.com/reference/android/graphics/PorterDuff.Mode.html

嘗試將其更改爲 '添加' 或 '清除'，希望這有助於。

Answer 3

你需要改變你的getWhiteBorderPaint（）方法如下：

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

的Paint constructor只需bitmasked標誌，並且不支持任意整數作爲參數。

Answer 4

考察轉化爲這個問題所陳述的原始問題。找到解決方案。

首先，更改DST_OUT變暗

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

其次，保存原來的文本顏色，並把預期的輪廓顏色了，畫出輪廓，然後恢復原來的文本顏色。

@Override 
public void draw(Canvas aCanvas) { 
    int originalColor = this.getCurrentTextColor(); 
    this.setTextColor(0xff000000); //set it to white. 

    aCanvas.saveLayer(null, borderPaint, 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); 

    this.setTextColor(originalColor); 
    aCanvas.restore(); 
    super.draw(aCanvas); 
}