開發中,有時候需要獲取View的截圖來做動畫來達到動畫流程的目的
原理:將View的內容畫到一個Bitmap畫布上,然后取出
下面封裝了一個從View生成Bitmap的工具類
/** * 將View轉換為Bitmap對象 */ public class ViewToBitmapUtil { private static final String TAG = "ViewToBitmapUtil"; public static Bitmap convertViewToBitmap(View view) { view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight()); view.buildDrawingCache(); Bitmap bitmap = view.getDrawingCache();
// 或者可以使用下面的方法
// view.setDrawingCacheEnabled(true);
// Bitmap bmp = Bitmap.createBitmap(view.getDrawingCache());
return bitmap; } public static Bitmap convertViewToBitmap(View view, int bitmapWidth, int bitmapHeight) { Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888); view.draw(new Canvas(bitmap)); return bitmap; } public static void getScreenRectOfView(View view, Rect outRect) { int pos[] = new int[2]; view.getLocationOnScreen(pos); outRect.set(pos[0], pos[1], pos[0] + view.getWidth(), pos[1] + view.getHeight()); }
}
