Xamarin Forms 2.0 AppCompat安卓键盘模式

Question

Xamarin我更新到版本4,Forms和2.0版本.在Android上,我使用AppCompat.

我有一个问题.以前,Android键盘导致调整大小视图.现在这不会发生.键盘出现在顶视图上.并且要隐藏所需的元素.

我试过了:

[Activity(WindowSoftInputMode = SoftInput.AdjustResize, Label = "Title", Icon = "@drawable/icon", Theme = "@style/MyTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            global::Xamarin.Forms.Forms.Init(this, bundle);


            ToolbarResource = Resource.Layout.toolbar;
            TabLayoutResource = Resource.Layout.tabs;

            LoadApplication(new App());
            Window.DecorView.SetFitsSystemWindows(true);
        }
    }

Daylight AppCompat已在本课程中完成:https://blog.xamarin.com/material-design-for-your-xamarin-forms-android-apps/

谢谢.

Answer 1

我已经解决了这个问题.反编译类"Forms AppCompatActivity"并观察该方法如何工作OnCreate.

结果,我发现了以下代码:

[Activity(Label = "Title", Icon = "@drawable/icon", Theme = "@style/MyTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            global::Xamarin.Forms.Forms.Init(this, bundle);

            Window.SetSoftInputMode(SoftInput.AdjustResize);
            AndroidBug5497WorkaroundForXamarinAndroid.assistActivity(this);

            ToolbarResource = Resource.Layout.toolbar;
            TabLayoutResource = Resource.Layout.tabs;

            LoadApplication(new App());

        }

        public class AndroidBug5497WorkaroundForXamarinAndroid
        {

            // For more information, see https://code.google.com/p/android/issues/detail?id=5497
            // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.

            // CREDIT TO Joseph Johnson (http://stackoverflow.com/users/341631/joseph-johnson) for publishing the original Android solution on stackoverflow.com

            public static void assistActivity(Activity activity)
            {
                new AndroidBug5497WorkaroundForXamarinAndroid(activity);
            }

            private Android.Views.View mChildOfContent;
            private int usableHeightPrevious;
            private FrameLayout.LayoutParams frameLayoutParams;

            private AndroidBug5497WorkaroundForXamarinAndroid(Activity activity)
            {
                FrameLayout content = (FrameLayout)activity.FindViewById(Android.Resource.Id.Content);
                mChildOfContent = content.GetChildAt(0);
                ViewTreeObserver vto = mChildOfContent.ViewTreeObserver;
                vto.GlobalLayout += (object sender, EventArgs e) => {
                    possiblyResizeChildOfContent();
                };
                frameLayoutParams = (FrameLayout.LayoutParams)mChildOfContent.LayoutParameters;
            }

            private void possiblyResizeChildOfContent()
            {
                int usableHeightNow = computeUsableHeight();
                if (usableHeightNow != usableHeightPrevious)
                {
                    int usableHeightSansKeyboard = mChildOfContent.RootView.Height;
                    int heightDifference = usableHeightSansKeyboard - usableHeightNow;

                    frameLayoutParams.Height = usableHeightSansKeyboard - heightDifference;

                    mChildOfContent.RequestLayout();
                    usableHeightPrevious = usableHeightNow;
                }
            }

            private int computeUsableHeight()
            {
                Rect r = new Rect();
                mChildOfContent.GetWindowVisibleDisplayFrame(r);
                if (Build.VERSION.SdkInt < BuildVersionCodes.Lollipop)
                {
                    return (r.Bottom - r.Top);
                }
                return r.Bottom;
            }

        }
    }

添加"Window.SetSoftInputMode(SoftInput.AdjustResize);"非常重要.在调用base.OnCreate(bundle)之后;