如何在android上查看desaturate？

Question

我有LinearLayout包含一些意見。是否可以這樣做，以使LinearLayout內的所有內容都以灰度色彩模式繪製？

Answer 1

您需要擴展LinearLayout並重寫dispatchDraw方法。

然後創建一個大小爲LinearLayout和畫布的位圖。並用新的畫布作爲參數調用super.dispatchDraw。之後，您可以使用設置ColorFilter的顏料在原始Canvas上繪製位圖。

這裏的例子：

private Bitmap mBitmap; 
private Canvas mCanvas; 
private Paint mPaint; 

public {Constructor}{ 
    mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
    ColorMatrix colorMatrix = new ColorMatrix(); 
    colorMatrix.setSaturation(0); 

    ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(colorMatrix); 
    mPaint.setColorFilter(colorFilter); 
} 

@Override 
public void onSizeChanged(int w, int h, in oldw, int oldh){ 
    mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
    mCanvas = new Camvas(mBitmap); 
} 

@Override 
public void dispatchDraw(Canvas canvas){ 
    super.dispatchDraw(mCanvas); 

    canvas.drawBitmap(mBitmap, 0, 0, mPaint); 
}