如何從調色板API中選取模糊顏色android

Question

我正在顯示從服務器獲取的每個圖像的佈局背景圖像，並且它工作正常。我需要佈局背景圖像以模糊。我爲此寫了一堂課。

我的問題是： 如何從調色板API中選取模糊顏色？

Bluer.java

public class BlurBuilder { 

    private static final float BITMAP_SCALE = 0.4f; 
    private static final float BLUR_RADIUS = 7.5f; 

    public static Bitmap blur(Context context, Bitmap image) { 
     int width = Math.round(image.getWidth() * BITMAP_SCALE); 
     int height = Math.round(image.getHeight() * BITMAP_SCALE); 

     Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false); 
     Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap); 

     RenderScript rs = RenderScript.create(context); 
     ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); 
     Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap); 
     Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap); 
     theIntrinsic.setRadius(BLUR_RADIUS); 
     theIntrinsic.setInput(tmpIn); 
     theIntrinsic.forEach(tmpOut); 
     tmpOut.copyTo(outputBitmap); 
     return outputBitmap; 
    } 
} 

MainActivity.java

final LinearLayout mMainLayout = (LinearLayout)findViewById(R.id.revi_main_layout); 

target = new Target() { 
    @Override 
    public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) { 

     mMainLayout.setBackground(new BitmapDrawable(bitmap)); 

     Palette.generateAsync(bitmap, new Palette.PaletteAsyncListener() { 
      public void onGenerated(Palette palette) { 
       movie_image.setImageBitmap(bitmap); 

       int defaultColor = getResources().getColor(R.color.whiteColor); 
       toolbar.setBackgroundColor(palette.getLightVibrantColor(defaultColor)); 

       toolbar.setTitleTextColor(palette.getDarkMutedColor(defaultColor)); 
       toolbar.setTitle(getString(R.string.title_activity_news_update_fulldec)); 
      } 
     }); 
    } 

    @Override 
    public void onBitmapFailed(Drawable errorDrawable) { 

    } 

    @Override 
    public void onPrepareLoad(Drawable placeHolderDrawable) { 

    } 
}; 
Picasso.with(getApplicationContext()).load((Reviews_update.revData.get(mov_pos)) 
             .getNewsImage()).into(target); 

請幫助我如何模糊我的佈局的背景圖像，從調色板API模糊的顏色嗎？

謝謝你提前

Answer 1

RenderScript要求sdk版本22.2作爲最低sdk。此方法也適用於較早版本。 使用此方法：

public Bitmap fastblur(Bitmap sentBitmap, float scale, int radius) { 

    int width = Math.round(sentBitmap.getWidth() * scale); 
    int height = Math.round(sentBitmap.getHeight() * scale); 
    sentBitmap = Bitmap.createScaledBitmap(sentBitmap, width, height, false); 

    Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true); 

    if (radius < 1) { 
     return (null); 
    } 

    int w = bitmap.getWidth(); 
    int h = bitmap.getHeight(); 

    int[] pix = new int[w * h]; 
    Log.e("pix", w + " " + h + " " + pix.length); 
    bitmap.getPixels(pix, 0, w, 0, 0, w, h); 

    int wm = w - 1; 
    int hm = h - 1; 
    int wh = w * h; 
    int div = radius + radius + 1; 

    int r[] = new int[wh]; 
    int g[] = new int[wh]; 
    int b[] = new int[wh]; 
    int rsum, gsum, bsum, x, y, i, p, yp, yi, yw; 
    int vmin[] = new int[Math.max(w, h)]; 

    int divsum = (div + 1) >> 1; 
    divsum *= divsum; 
    int dv[] = new int[256 * divsum]; 
    for (i = 0; i < 256 * divsum; i++) { 
     dv[i] = (i/divsum); 
    } 

    yw = yi = 0; 

    int[][] stack = new int[div][3]; 
    int stackpointer; 
    int stackstart; 
    int[] sir; 
    int rbs; 
    int r1 = radius + 1; 
    int routsum, goutsum, boutsum; 
    int rinsum, ginsum, binsum; 

    for (y = 0; y < h; y++) { 
     rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0; 
     for (i = -radius; i <= radius; i++) { 
      p = pix[yi + Math.min(wm, Math.max(i, 0))]; 
      sir = stack[i + radius]; 
      sir[0] = (p & 0xff0000) >> 16; 
      sir[1] = (p & 0x00ff00) >> 8; 
      sir[2] = (p & 0x0000ff); 
      rbs = r1 - Math.abs(i); 
      rsum += sir[0] * rbs; 
      gsum += sir[1] * rbs; 
      bsum += sir[2] * rbs; 
      if (i > 0) { 
       rinsum += sir[0]; 
       ginsum += sir[1]; 
       binsum += sir[2]; 
      } else { 
       routsum += sir[0]; 
       goutsum += sir[1]; 
       boutsum += sir[2]; 
      } 
     } 
     stackpointer = radius; 

     for (x = 0; x < w; x++) { 

      r[yi] = dv[rsum]; 
      g[yi] = dv[gsum]; 
      b[yi] = dv[bsum]; 

      rsum -= routsum; 
      gsum -= goutsum; 
      bsum -= boutsum; 

      stackstart = stackpointer - radius + div; 
      sir = stack[stackstart % div]; 

      routsum -= sir[0]; 
      goutsum -= sir[1]; 
      boutsum -= sir[2]; 

      if (y == 0) { 
       vmin[x] = Math.min(x + radius + 1, wm); 
      } 
      p = pix[yw + vmin[x]]; 

      sir[0] = (p & 0xff0000) >> 16; 
      sir[1] = (p & 0x00ff00) >> 8; 
      sir[2] = (p & 0x0000ff); 

      rinsum += sir[0]; 
      ginsum += sir[1]; 
      binsum += sir[2]; 

      rsum += rinsum; 
      gsum += ginsum; 
      bsum += binsum; 

      stackpointer = (stackpointer + 1) % div; 
      sir = stack[(stackpointer) % div]; 

      routsum += sir[0]; 
      goutsum += sir[1]; 
      boutsum += sir[2]; 

      rinsum -= sir[0]; 
      ginsum -= sir[1]; 
      binsum -= sir[2]; 

      yi++; 
     } 
     yw += w; 
    } 
    for (x = 0; x < w; x++) { 
     rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0; 
     yp = -radius * w; 
     for (i = -radius; i <= radius; i++) { 
      yi = Math.max(0, yp) + x; 

      sir = stack[i + radius]; 

      sir[0] = r[yi]; 
      sir[1] = g[yi]; 
      sir[2] = b[yi]; 

      rbs = r1 - Math.abs(i); 

      rsum += r[yi] * rbs; 
      gsum += g[yi] * rbs; 
      bsum += b[yi] * rbs; 

      if (i > 0) { 
       rinsum += sir[0]; 
       ginsum += sir[1]; 
       binsum += sir[2]; 
      } else { 
       routsum += sir[0]; 
       goutsum += sir[1]; 
       boutsum += sir[2]; 
      } 

      if (i < hm) { 
       yp += w; 
      } 
     } 
     yi = x; 
     stackpointer = radius; 
     for (y = 0; y < h; y++) { 
      // Preserve alpha channel: (0xff000000 & pix[yi]) 
      pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum]; 

      rsum -= routsum; 
      gsum -= goutsum; 
      bsum -= boutsum; 

      stackstart = stackpointer - radius + div; 
      sir = stack[stackstart % div]; 

      routsum -= sir[0]; 
      goutsum -= sir[1]; 
      boutsum -= sir[2]; 

      if (x == 0) { 
       vmin[y] = Math.min(y + r1, hm) * w; 
      } 
      p = x + vmin[y]; 

      sir[0] = r[p]; 
      sir[1] = g[p]; 
      sir[2] = b[p]; 

      rinsum += sir[0]; 
      ginsum += sir[1]; 
      binsum += sir[2]; 

      rsum += rinsum; 
      gsum += ginsum; 
      bsum += binsum; 

      stackpointer = (stackpointer + 1) % div; 
      sir = stack[stackpointer]; 

      routsum += sir[0]; 
      goutsum += sir[1]; 
      boutsum += sir[2]; 

      rinsum -= sir[0]; 
      ginsum -= sir[1]; 
      binsum -= sir[2]; 

      yi += w; 
     } 
    } 

    Log.e("pix", w + " " + h + " " + pix.length); 
    bitmap.setPixels(pix, 0, w, 0, 0, w, h); 

    return (bitmap); 
} 

例子：

Drawable myDrawable = getResources().getDrawable(R.drawable.pp); 
Bitmap myLogo = ((BitmapDrawable) myDrawable).getBitmap(); 
Bitmap bitmap = fastblur(myLogo, 0.9f, (int) 7.5f); 

讓我知道，如果它工作或沒有