我有一个主屏幕小部件,线性布局。我试图设置阿尔法使用远程视图运行时的背景,但小部件不加载。
I have a homescreen widget, with linear layout. I'm trying to set Alpha for the background during runtime using remote views, but the widget doesn't load.
我用这样的:
remoteView.setFloat(R.id.widget_background, "setAlpha", (float)0.7);设置背景颜色或文本颜色以同样的方式,作品。我如何使用远程视图设置背景透明度?
Setting background color or text color the same way, works. How can I set the background transparency using remote views?
推荐答案我用以下解决方案:
float opacity = 0.3f; //opacity = 0: fully transparent, opacity = 1: no transparancy int backgroundColor = 0x000000; //background color (here black) remoteView.setInt( R.id.loMain, "setBackgroundColor", (int)(opacity * 0xFF) << 24 | backgroundColor);loMain 是我的窗口小部件的主要布局
loMain is a main layout of my widget
如果小部件的主要布局使用背景形状(例如机器人:背景=@绘制/ shape_transparent),其具有的圆角那么这里是一个更复杂的解决方案:
If the main layout of the widget uses shape background (e.g. android:background="@drawable/shape_transparent") which has rounded corner then here is a more complex solution:
float transparency = 0.5f; //0...1 long colorFilter = 0x01000000L * (long)(255f * transparency); try { final Method[] declaredMethods = Class.forName("android.widget.RemoteViews").getDeclaredMethods(); final int len = declaredMethods.length; if (len > 0) { for (int m=0; m<len; m++ ) { final Method method = declaredMethods[m]; if (method.getName().equals("setDrawableParameters")) { method.setAccessible(true); method.invoke(remoteView, R.id.loMain, true, -1, (int)colorFilter, PorterDuff.Mode.DST_OUT, -1); break; } } } } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); }您可以通过使用变量的阿尔法并发挥 colorFilter ,以满足您的需求。
You can play with variables alfa and colorFilter to meet your needs.
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