修复 camera lib 错误

ApexDrivers/racameralib/src/main/java/redant/usai/com/racameralib/crop/FloatDrawable.java

@@ -5,6 +5,7 @@ import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
+import android.graphics.PixelFormat;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 
@@ -112,7 +113,8 @@ public class FloatDrawable extends Drawable {
 
     @Override
     public int getOpacity() {
-        return 0;
+
+        return PixelFormat.UNKNOWN;
     }
 
     public int dipTopx(Context context, float dpValue) {