[Xamarin] 動態載入Fragment (转帖)

這篇我們來動態加入，一樣務求好懂簡單

1.一樣先將專案調整成3.0以上版本

 

2.首先建立自定Control的Layout ResourcesLayoutMyControlLayout1.axml

主要我要設定此元件有一個按鈕 按下去後，可以改變上方TextView (textView1) 的文字內容，當然這文字內容可能是由主要的Activity給予的

MyControlLayout1.axml Code :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是Control 預設文字" />
    <Button
        android:text="Control內部按鈕"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnChangeText" />
</LinearLayout>

3. 來開一個Fragment 來操控 MyControlLayout1 的Layout MyControlFragment.cs

MyControlFragment.cs Code :

using Android.App;
using Android.OS;
using Android.Views;
using Android.Widget;

namespace DynamicCallFragment
{
    public class MyControlFragment : Fragment
    {
        /// <summary>
        /// Poroperty DisplayContext
        /// 欲呈現的文字
        /// </summary>
        public string DisplayContext { get; set; }


        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            View v = inflater.Inflate(Resource.Layout.MyControlLayout1, container, false);
            var btnChangeText = v.FindViewById<Button>(Resource.Id.btnChangeText);

            //設定  btnChangeText 點擊後將 textView1 的內容設為 DisplayContext
            btnChangeText.Click += delegate
            {
                var textView1 = v.FindViewById<TextView>(Resource.Id.textView1);
                textView1.Text = DisplayContext;
            };

            return v;
        }
    }
}

4.主Activity Layout   ResourcesLayoutMain.axml

 
其中我放入一個LinearLayout (linearLayout1)拿來放生出來的Control  Main.axml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:orientation="vertical"
    android:layout_height="fill_parent">
    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Test 動態加入Control" />
    <Button
        android:text="加入新的Fragment"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnDynamicAddFragment" />
    <LinearLayout
        android:orientation="vertical"
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout1" />
</LinearLayout>

5.接下來就是 MainActivity 來做動態生成的部分拉:

using Android.App;
using Android.Widget;
using Android.OS;

namespace DynamicCallFragment
{
    [Activity(Label = "動態加入Control", MainLauncher = true, Icon = "@drawable/icon")]
    public class Activity1 : Activity
    {
        private int count { get; set; }

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            // --- 動態呼叫
            var btnDynamicAddFragment = FindViewById<Button>(Resource.Id.btnDynamicAddFragment);
            btnDynamicAddFragment.Click += delegate
            {

                var fragmentManager = FragmentManager;
                FragmentTransaction fragmentTransaction = fragmentManager.BeginTransaction();
                var d_fragment1 = new MyControlFragment();
                //加上計數作為辨識
                d_fragment1.DisplayContext = "我是動態叫起來的" + count;
                fragmentTransaction.Add(Resource.Id.linearLayout1, d_fragment1);
                fragmentTransaction.Commit();
                count++;

            };
        }
    }
}

結果： 執行起來

按下加入新的Fragment後

按下Control內部按鈕:

多測試幾個

是不是比之前單純Inflate好管理多了呢 :)

 

Reference: http://docs.xamarin.com/guides/android/platform_features/fragments

http://blog.kenyang.net/2013/03/android-fragment-activity.html