根据资源名称获取对应资源

public static int getDrawResourceID(Context ctx, String resourceName) {
        Resources res=ctx.getResources();
        int picid = res.getIdentifier(resourceName,"mipmap",ctx.getPackageName());
        return picid;
    }

根据资源名称获取到资源id   

如果是drawable 

mipmap 换成drawable 

Drawable d = ContextCompat.getDrawable(msgView.getContext(),  android.R.drawable.ic_menu_add);