我的启动活动只显示一个纯白色的屏幕。我在Xamarin Forms项目中。当我尝试使用样式来设置背景时，它可以工作，但是图像被拉伸了，这就是我尝试使用LinearLayout和ImageView的原因。这是我的代码：
data := []byte(`{
"fantasy_content": {
"copyright": "Data provided by Yahoo! and STATS, LLC",
"league": [
{
"allow_add_to_dl_extra_pos": 0,
"current_week": "1",
"draft_status": "predraft",
"edit_key": "1",
"end_date": "2017-12-25",
"end_week": "16",
"game_code": "nfl",
"is_cash_league": "0",
"is_pro_league": "0",
"league_id": "XXXXX",
"league_key": "XXXX",
"league_type": "private",
"league_update_timestamp": null,
"name": "XXXXXX",
"num_teams": 14,
"renew": "XXXX",
"renewed": "",
"scoring_type": "head",
"season": "2017",
"short_invitation_url": "XXXXX",
"start_date": "2017-09-07",
"start_week": "1",
"url": "XXXXXX",
"weekly_deadline": ""
},
{
"teams": {
"0": {
"team": [
[
{
"team_key": "XXXX"
},
{
"team_id": "1"
},
{
"name": "XXXXX"
},
[],
{
"url": "XXXXX"
},
{
"team_logos": [
{
"team_logo": {
"size": "large",
"XXX"
}
}
]
},
[],
{
"waiver_priority": ""
},
{
"faab_balance": "100"
},
{
"number_of_moves": 0
},
{
"number_of_trades": 0
},
{
"roster_adds": {
"coverage_type": "week",
"coverage_value": "1",
"value": "0"
}
},
[],
{
"league_scoring_type": "head"
},
[],
[],
{
"has_draft_grade": 0
},
[],
[],
{
"managers": [
{
"manager": {
"email": "XXXXX",
"guid": "XX",
"image_url": "https://s.yimg.com/wm/modern/images/default_user_profile_pic_64.png",
"is_commissioner": "1",
"manager_id": "1",
"nickname": "Andrew"
}
}
]
}
]
]
},
"1": {
"team": [
[
{
"team_key": "XXXXX"
},
{
"team_id": "2"
},
{
"name": "XXXXX"
},
[],
{
"url": "XXXXX"
},
{
"team_logos": [
{
"team_logo": {
"size": "large",
"url": "XXXX"
}
}
]
},
[],
{
"waiver_priority": ""
},
{
"faab_balance": "100"
},
{
"number_of_moves": 0
},
{
"number_of_trades": 0
},
{
"roster_adds": {
"coverage_type": "week",
"coverage_value": "1",
"value": "0"
}
},
[],
{
"league_scoring_type": "head"
},
[],
[],
{
"has_draft_grade": 0
},
[],
[],
{
"managers": [
{
"manager": {
"email": "XXXX@yahoo.com",
"guid": "XXXX",
"image_url": "https://s.yimg.com/wm/modern/images/default_user_profile_pic_64.png",
"manager_id": "2",
"nickname": "Andrew"
}
},
{
"manager": {
"email": "XXX@yahoo.com",
"guid": "XX",
"image_url": "https://s.yimg.com/wm/modern/images/default_user_profile_pic_64.png",
"is_comanager": "1",
"manager_id": "15",
"nickname": "XX"
}
}
]
}
]
]
},
"10": {
"team": [
[
{
"team_key": "XXX"
},
{
"team_id": "11"
},
{
"name": "XXX"
},
[],
{
"url": "https://football.fantasysports.yahoo.com/f1/XXX"
},
{
"team_logos": [
{
"team_logo": {
"size": "large",
"url": "https://s.yimg.com/dh/ap/fantasy/nfl/img/icon_01_100.png"
}
}
]
},
[],
{
"waiver_priority": ""
},
{
"faab_balance": "100"
},
{
"number_of_moves": 0
},
{
"number_of_trades": 0
},
{
"roster_adds": {
"coverage_type": "week",
"coverage_value": "1",
"value": "0"
}
},
[],
{
"league_scoring_type": "head"
},
[],
[],
{
"has_draft_grade": 0
},
[],
[],
{
"managers": [
{
"manager": {
"email": "XXX@gmail.com",
"guid": "XX",
"image_url": "https://s.yimg.com/wm/modern/images/default_user_profile_pic_64.png",
"manager_id": "11",
"nickname": "XX"
}
}
]
}
]
]
},
"2": {
"team": [
[
{
"team_key": "371.l.102542.t.3"
},
{
"team_id": "3"
},
{
"name": "XXX"
},
[],
{
"url": "https://football.fantasysports.yahoo.com/f1/XX/3"
},
{
"team_logos": [
{
"team_logo": {
"size": "large",
"url": "https://ct.yimg.com/cy/5603/30147468023_1c705edb29_192sq.jpg?ct=fantasy"
}
}
]
},
[],
{
"waiver_priority": ""
},
{
"faab_balance": "100"
},
{
"number_of_moves": 0
},
{
"number_of_trades": 0
},
{
"roster_adds": {
"coverage_type": "week",
"coverage_value": "1",
"value": "0"
}
},
[],
{
"league_scoring_type": "head"
},
[],
[],
{
"has_draft_grade": 0
},
[],
[],
{
"managers": [
{
"manager": {
"email": "XXXgmail.com",
"guid": "XXXX",
"image_url": "https://s.yimg.com/wv/images/6c93ed606f742d4c075bc091633cc072_64.jpg",
"manager_id": "3",
"nickname": "XX"
}
}
]
}
]
]
},
"3": {
"team": [
[
{
"team_key": "371.l.102542.t.4"
},
{
"team_id": "4"
},
{
"name": "XX"
},
[],
{
"url": "https://football.fantasysports.yahoo.com/f1/XX/4"
},
{
"team_logos": [
{
"team_logo": {
"size": "large",
"url": "https://s.yimg.com/dh/ap/fantasy/nfl/img/icon_10_100.png"
}
}
]
},
[],
{
"waiver_priority": ""
},
{
"faab_balance": "100"
},
{
"number_of_moves": 0
},
{
"number_of_trades": 0
},
{
"roster_adds": {
"coverage_type": "week",
"coverage_value": "1",
"value": "0"
}
},
[],
{
"league_scoring_type": "head"
},
[],
[],
{
"has_draft_grade": 0
},
[],
[],
{
"managers": [
{
"manager": {
"email": "XXX@yahoo.com",
"guid": "XX",
"image_url": "https://s.yimg.com/wm/modern/images/default_user_profile_pic_64.png",
"manager_id": "4",
"nickname": "XX"
}
}
]
}
]
]
},
"8": {
"team": [
[
{
"team_key": "XXX"
},
{
"team_id": "9"
},
{
"name": "XxX"
},
[],
{
"url": "https://football.fantasysports.yahoo.com/f1/XX/9"
},
{
"team_logos": [
{
"team_logo": {
"size": "large",
"url": "https://ct.yimg.com/cy/8393/28682944304_33bda49603_192sq.jpg?ct=fantasy"
}
}
]
},
[],
{
"waiver_priority": ""
},
{
"faab_balance": "100"
},
{
"number_of_moves": 0
},
{
"number_of_trades": 0
},
{
"roster_adds": {
"coverage_type": "week",
"coverage_value": "1",
"value": "0"
}
},
[],
{
"league_scoring_type": "head"
},
[],
[],
{
"has_draft_grade": 0
},
[],
[],
{
"managers": [
{
"manager": {
"email": "XXX",
"guid": "XXX",
"image_url": "https://s.yimg.com/wm/modern/images/default_user_profile_pic_64.png",
"manager_id": "9",
"nickname": "XXX"
}
}
]
}
]
]
},
"count": 14
}
}
],
"refresh_rate": "60",
"time": "110.55207252502ms",
"xml:lang": "en-US",
"yahoo:uri": "/fantasy/v2/league/XXXX/teams"
}
}`)
答案 0 :(得分：1)
以编程方式创建Layout ImageView：
ViewGroup.LayoutParams，其宽度和高度设置为MatchParent ImageView ImageView.SetScaleType，了解您希望如何扩展您的drawable（例如ImageView.ScaleType.FitCenter）注意：您不需要LinearLayout，只需设置ImageView的背景颜色
即可protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
var layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent);
var imageView = new ImageView(this)
{
LayoutParameters = layoutParams
};
imageView.SetImageResource(Resource.Drawable.splash_screen);
imageView.SetScaleType(ImageView.ScaleType.FitCenter);
imageView.SetBackgroundColor(Color.ParseColor("#0098CC"));
SetContentView(imageView);
}
protected async override void OnResume()
{
base.OnResume();
await Task.Delay(5000); // simulate some background work....
StartActivity(typeof(MainActivity));
}