我有兩個活動，一個只有一個巨大的列表視圖，另一個有一個純文本和按鈕。這個“newRoll”活動需要返回一個添加到 ObservableCollection 的字符串，我還沒有實現 listView 更新的部分但是使用 logcat，我可以看出沒有任何東西被添加到包含所有項目的 ObservableCollection。從我得到的信息來看，我對意圖的工作方式有什么誤解嗎？主要活動： //upon clicking any item in the listView this runs: Intent NewRoll = new Intent(this, typeof(NewRoll)); StartActivityForResult(NewRoll, requestCode);protected void onActivityResult(int requestCode, int resultCode, Intent data) { //just holds the string holder = data.GetStringExtra("roll_name"); //adds it to an observable collection rolls.Add(holder); //me trying to get something back Log.Info(rolls.Count.ToString(), "Roll Added"); Log.Info(holder, "Please?"); }新卷：//on button click//get whatever is in the plaintext newRoll = rollName.Text; data.PutExtra("roll_name",newRoll); SetResult(Result.Ok, data); Finish();
2 回答
翻翻過去那場雪
TA貢獻2065條經驗 獲得超14個贊
Xamarin的文檔指出 Android.App.Activity.OnActivityResult 的簽名是
[Android.Runtime.Register("onActivityResult", "(IILandroid/content/Intent;)V", "GetOnActivityResult_IILandroid_content_Intent_Handler")]
protected virtual Void OnActivityResult (Int32 requestCode, [Android.Runtime.GeneratedEnum] Result resultCode, Intent data)
所以你必須重寫它來接收活動結果，比如
protected override Void OnActivityResult (Int32 requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
// do your stuff
}
斯蒂芬大帝
TA貢獻1827條經驗 獲得超8個贊
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
//just holds the string
holder = data.GetStringExtra("roll_name");
//adds it to an observable collection
rolls.Add(holder);
//me trying to get something back
Log.Info(rolls.Count.ToString(), "Roll Added");
Log.Info(holder, "Please?");
}
我在這里沒有看到@Override注釋。您確定要覆蓋Activity基類方法onActivityResult嗎？
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