Android - 如何使圖標發光觸摸？

Question

如何在圖標上獲得藍色發光效果？有沒有快速的方法來做到這一點？我真的不想用這個效果的Photoshop。

任何幫助將非常感激。

Answer 1

如果您希望通過編程產生輝光，這裏是你如何能做到。我的建議是，在你的活動beggining產生它只是一次，然後用它創建一個StateListDrawable，如評論說：

// An added margin to the initial image 
    int margin = 24; 
    int halfMargin = margin/2; 

    // the glow radius 
    int glowRadius = 16; 

    // the glow color 
    int glowColor = Color.rgb(0, 192, 255); 

    // The original image to use 
    Bitmap src = BitmapFactory.decodeResource(getResources(), 
      R.drawable.ic_launcher); 

    // extract the alpha from the source image 
    Bitmap alpha = src.extractAlpha(); 

    // The output bitmap (with the icon + glow) 
    Bitmap bmp = Bitmap.createBitmap(src.getWidth() + margin, 
      src.getHeight() + margin, Bitmap.Config.ARGB_8888); 

    // The canvas to paint on the image 
    Canvas canvas = new Canvas(bmp); 

    Paint paint = new Paint(); 
    paint.setColor(glowColor); 

    // outer glow 
    paint.setMaskFilter(new BlurMaskFilter(glowRadius, Blur.OUTER)); 
    canvas.drawBitmap(alpha, halfMargin, halfMargin, paint); 

    // original icon 
    canvas.drawBitmap(src, halfMargin, halfMargin, null); 

    ((ImageView) findViewById(R.id.bmpImg)).setImageBitmap(bmp);