在Xamarin.Forms中的android上的运行时期间更改状态栏颜色
问题描述：
我想在运行时以编程方式更改状态栏的颜色.我已经尝试过了:
I would like to change the colour of the status bar during run-time programatically. I have tried this:
if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
{
Window.ClearFlags(WindowManagerFlags.TranslucentStatus);
Window.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
Window.SetStatusBarColor(Android.Graphics.Color.Blue);
}
但是它只能在MainActivity.cs类中使用.
but it only works in the MainActivity.cs class.
我想在运行时进行更改.
I would like to change it during runtime.
答
依赖接口:
public interface IStatusBarColor
{
void CoreMeltDown();
void MakeMe(string color);
}
您需要可以通过多种方法获得的当前Activity的上下文； MainActivity上的静态变量，使用CurrentActivityPlugin等. hackie并使用静态变量，因此添加一个静态Context变量并将其设置在OnResume中.
You need the current Activity's context which you can obtain via multiple methods; A static var on the MainActivity, using the CurrentActivityPlugin, etc... Lets keep it simple & hackie and use a static var, so add a static Context var and set it in the OnResume.
public static Context context;
protected override void OnResume()
{
context = this;
base.OnResume();
}
Android依赖关系实现:
public class StatusBarColor : IStatusBarColor
{
public void MakeMe(string color)
{
if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
{
var c = MainActivity.context as FormsAppCompatActivity;
c?.RunOnUiThread(() => c.Window.SetStatusBarColor(Color.ParseColor(color)));
}
}
public void CoreMeltDown()
{
Task.Run(async () =>
{
for (int i = 0; i < 10; i++)
{
switch (i%2)
{
case 0:
MakeMe($"#{Integer.ToHexString(Color.Red.ToArgb())}");
break;
case 1:
MakeMe($"#{Integer.ToHexString(Color.White.ToArgb())}");
break;
}
await Task.Delay(200);
}
});
}
}
用法:
var statusBarColor = DependencyService.Get<IStatusBarColor>();
statusBarColor?.MakeMe(Color.Blue.ToHex());
statusBarColor?.CoreMeltDown();