~楓花雪岳~: [X.Andriod] Application

星期五, 7月 01, 2016

[X.Andriod] Application

Activity 之間傳遞參數，可以透過 Intent 來傳遞，但假如是共同參數，EX：使用者登錄資訊，可以透過自訂 Application，把參數放在 Application 內，來讓 Activity 來存取參數資訊

自訂 Application

namespace ApplicationLogin
{
    // 一定要有 Application Attribute
    [Application]
    public class MyApplication : Android.App.Application
    {

        public string UserName { get; set; }

        public MyApplication(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
        {
            this.UserName = "Unkown";
        }

        public override void OnCreate()
        {
            base.OnCreate();
            Toast.MakeText(this, "執行 MyApplication", ToastLength.Long).Show();
        }
    }
}

Loginlayout.axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="25px"
    android:minHeight="25px">
    <LinearLayout
        android:orientation="horizontal"
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout1">
        <TextView
            android:text="使用者名稱："
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:id="@+id/textView1"
            android:textSize="20dp"
            android:gravity="center" />
        <EditText
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:id="@+id/txtUserName"
            android:hint="請輸入使用者名稱"
            android:inputType="text" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout3">
        <Button
            android:text="登錄"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:id="@+id/btnLogin" />
    </LinearLayout>
</LinearLayout>

Layout1.axml：沒有任何控件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

LoginActivity.cs

namespace ApplicationLogin
{
    [Activity(Label = "ApplicationLogin", MainLauncher = true, Icon = "@drawable/icon")]
    public class LoginActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.Loginlayout);

            FindViewById<Button>(Resource.Id.btnLogin).Click += (sender, e) =>
            {
                MyApplication app = (MyApplication)this.Application;
                app.UserName = FindViewById<EditText>(Resource.Id.txtUserName).Text.Trim();
                this.StartActivity(typeof(Activity1));
            };
        }
    }
}

Activity.cs

namespace ApplicationLogin
{
    [Activity(Label = "Activity1")]
    public class Activity1 : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            MyApplication app = (MyApplication)this.Application;
            Toast.MakeText(this, app.UserName, ToastLength.Long).Show();
        }
    }
}

執行 App