我在MWC.Android项目上工作，我建立了自己的项目，但是当我在活动之间切换时，我需要花费几秒钟的时间和GC启动。问题显示在活动之间的所有切换。所有对象列表等清除可能是我的项目设置中的问题。
从设备部署：
[AbsListView] unregisterIRListener() is called
[AbsListView] onVisibilityChanged() is called, visibility : 0
[AbsListView] unregisterIRListener() is called
[AbsListView] unregisterIRListener() is called
[AbsListView] unregisterIRListener() is called
[AbsListView] unregisterIRListener() is called
[AbsListView] unregisterIRListener() is called
[Mono] GC_BRIDGE num-objects 60 num_hash_entries 70 sccs size 70 init 0.00ms df1 0.24ms sort 0.03ms dfs2 0.15ms setup-cb 0.09ms free-data 0.09ms user-cb 27.86ms clenanup 0.18ms links 21/21/19/1 dfs passes 260/149
[Mono] GC_MINOR: (Nursery full) pause 5.55ms, total 5.68ms, bridge 28.47ms promoted 368K major 1344K los 0K
[Choreographer] Skipped 76 frames! The application may be doing too much work on its main thread.
[AbsListView] unregisterIRListener() is called
[AbsListView] unregisterIRListener() is called
[AbsListView] unregisterIRListener() is called
[--------] OnResume called, app is ready to interact with the user
[AbsListView] unregisterIRListener() is called
[Mono] The request to load the assembly System.Xml v2.0.5.0 was remapped to v2.0.0.0
[Mono] Unloading image System.Xml.dll [0x7cae81d8].
[Mono] GC_BRIDGE num-objects 202 num_hash_entries 8119 sccs size 8119 init 0.00ms df1 17.58ms sort 2.99ms dfs2 7.84ms setup-cb 1.01ms free-data 6.10ms user-cb 35.55ms clenanup 0.46ms links 9462/9462/7954/4 dfs passes 18022/17709
[Mono] GC_MINOR: (Nursery full) pause 31.77ms, total 31.95ms, bridge 54.08ms promoted 864K major 2208K los 64K
[Mono] The request to load the assembly System v2.0.5.0 was remapped to v2.0.0.0
[Mono] Unloading image System.dll [0x7acf0768].
Thread started: <Thread Pool> #2
Thread started: <Thread Pool> #3
[AbsListView] unregisterIRListener() is called
[Mono] The request to load the assembly Mono.Security v2.0.5.0 was remapped to v2.0.0.0
[Mono] Assembly Mono.Security[0x7b675248] added to domain RootDomain, ref_count=1
[Mono] AOT failed to load AOT module Mono.Security.dll.so: dlopen failed: library "/data/data/CarCatalog.CarCatalog/lib/Mono.Security.dll.so" not found
[Mono] The request to load the assembly mscorlib v2.0.5.0 was remapped to v2.0.0.0
[Mono] Unloading image mscorlib.dll [0x7c1195b8].
Loaded assembly: Mono.Security.dll [External]
[Mono] The request to load the assembly Mono.Security v2.0.5.0 was remapped to v2.0.0.0
[Mono] Unloading image Mono.Security.dll [0x7c9a7668].
[Mono] The request to load the assembly System v2.0.5.0 was remapped to v2.0.0.0
[Mono] Unloading image System.dll [0x7c9a7668].
[Mono] DllImport attempting to load: '/system/lib/libc.so'.
[Mono] DllImport loaded library '/system/lib/libc.so'.
[Mono] DllImport searching in: '/system/lib/libc.so' ('/system/lib/libc.so').
[Mono] Searching for 'uname'.
[Mono] Probing 'uname'.
[Mono] Found as 'uname'.
[Mono] DllImport attempting to load: '/system/lib/libc.so'.
[Mono] DllImport loaded library '/system/lib/libc.so'.
[Mono] DllImport searching in: '/system/lib/libc.so' ('/system/lib/libc.so').
[Mono] Searching for 'gettid'.
[Mono] Probing 'gettid'.
[Mono] Found as 'gettid'.
[Mono] GC_BRIDGE num-objects 18 num_hash_entries 24 sccs size 24 init 0.00ms df1 0.09ms sort 0.09ms dfs2 0.21ms setup-cb 0.00ms free-data 0.06ms user-cb 30.79ms clenanup 0.03ms links 9468/9468/7960/4 dfs passes 18070/17739
[Mono] GC_MINOR: (Nursery full) pause 20.20ms, total 20.35ms, bridge 31.28ms promoted 1232K major 3440K los 256K
[AbsListView] onVisibilityChanged() is called, visibility : 4
[AbsListView] unregisterIRListener() is called
我的代码示例：
protected override void OnCreate(Bundle bundle)
{
//CMobApp.LogDebug("CARS OnCreate");
base.OnCreate(bundle);
// set our layout to be the home screen
SetContentView(Resource.Layout.ContentLayout);
//Top left menu btn
tittle = FindViewById<TextView> (Resource.Id.textView1);
selectCar = FindViewById<TextView> (Resource.Id.textView2);
Typeface tf = Typeface.CreateFromAsset (this.Assets, "fonts/ProximaNova-Regular.otf");
tittle.SetTypeface (tf, TypefaceStyle.Normal);
selectCar.SetTypeface (tf, TypefaceStyle.Normal);
//spinnerText.SetTypeface (tf, TypefaceStyle.Normal);
//Find our controls
carListView = FindViewById<ListView>(Resource.Id.CarList);
makeSpinner = FindViewById<Spinner> (Resource.Id.MakeSpinner);
modelSpinner = FindViewById<Spinner> (Resource.Id.ModelSpinner);
versionSpinner = FindViewById<Spinner> (Resource.Id.VersionSpinner);
//Nowy spinner: GENERACJA
generationSpinner = FindViewById<Spinner> (Resource.Id.TypeSpinner);
ImageButton favouriteButton = FindViewById<ImageButton> (Resource.Id.favouriteButton);
//var gallery = FindViewById<ImageButton> (Resource.Id.gallery);
//var menu = FindViewById<FlyOutContainer> (Resource.Id.FlyOutContainer);
//var menuButton = FindViewById (Resource.Id.MenuButton);
favouriteButton.Click += (sender, e) => {
Intent intent = new Intent();
intent.SetClass(this, typeof(FavoritesScreen));
intent.AddFlags(ActivityFlags.ClearTop); // http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TOP
StartActivity(intent);
};
generationSpinner.Visibility = ViewStates.Gone;
InitMakeSpinner ();
InitModelSpinner ();
InitVersionSpinner ();
InitGenerationSpinner ();
// wire up task click handler
if (carListView != null) {
carListView.ItemClick += (object sender, AdapterView.ItemClickEventArgs e) => {
var carDetails = new Intent(this, typeof(CarDetailsScreen));
carDetails.PutExtra("CarID", cars[e.Position].ID);
StartActivity(carDetails);
};
}
}
//NEW Adding generation:
void InitGenerationSpinner () {
generationSpinner.Enabled = true;
generationSpinner.ItemSelected += (object sender, AdapterView.ItemSelectedEventArgs e) => {
selectedGeneration = generation [e.Position];
RunOnUiThread (() => {
UpdateGenerationSpinner();
UpdateCarList ();
selectedGeneration = null;
});
};
}
void InitVersionSpinner () {
//versionSpinner.Enabled = false;
versionSpinner.ItemSelected += (object sender, AdapterView.ItemSelectedEventArgs e) => {
selectedVersion = versions [e.Position];
RunOnUiThread (() => {
UpdateCarList ();
UpdateGenerationSpinner();
});
};
}
void InitModelSpinner ()
{
modelSpinner.Enabled = false;
modelSpinner.ItemSelected += (object sender, AdapterView.ItemSelectedEventArgs e) => {
selectedModel = models [e.Position];
RunOnUiThread (() => {
UpdateVersionSpinner();
UpdateCarList ();
});
};
}
void InitMakeSpinner ()
{
makes = MakeManager.GetMakes ();
if (makes.Count != 0) {
selectedMake = makes [2];
ArrayAdapter<Make> makesArrayAdapter = new ArrayAdapter<Make> (this, Resource.Layout.SpinnerText, makes);
makesArrayAdapter.SetDropDownViewResource (Resource.Layout.row_spinner);
makeSpinner.Adapter = makesArrayAdapter;
makeSpinner.Visibility = Android.Views.ViewStates.Visible;
makeSpinner.SetSelection (2);
makeSpinner.ItemSelected += (object sender, AdapterView.ItemSelectedEventArgs e) => {
selectedMake = makes [e.Position];
RunOnUiThread (() => {
UpdateModelSpinner ();
UpdateCarList ();
});
};
} else {
makeSpinner.Visibility = Android.Views.ViewStates.Invisible;
Android.Util.Log.Info ("CarsScreen.cs", "MakeManager count 0");
}
}
protected void UpdateCarList() {
if (selectedModel!=null && selectedVersion!=null && selectedGeneration == null) {
//cars.Clear ();
cars = CMob.BL.Managers.CarManager.GetCars(selectedModel, selectedVersion);
} else if (selectedModel!=null && selectedVersion!=null && selectedGeneration!=null) {
//cars.Clear ();
cars = CMob.BL.Managers.CarManager.GetCars(selectedModel, selectedVersion,selectedGeneration);
} else if (selectedModel!=null) {
//cars.Clear ();
cars = CMob.BL.Managers.CarManager.GetCars(selectedModel);
}
else if (selectedMake!=null) {
//cars.Clear ();
cars = CMob.BL.Managers.CarManager.GetCars(selectedMake);
}
else if(selectedGeneration!=null){
// cars.Clear ();
cars = CMob.BL.Managers.CarManager.GetCars(selectedGeneration);
}
carListView.Adapter = new CMob.Adapters.CarListAdapter(this, cars);
}
protected void UpdateModelSpinner() {
if (selectedMake != null) {
models = ModelManager.GetModels(selectedMake);
modelsArrayAdapter = new ArrayAdapter<Model> (this, Resource.Layout.SpinnerText , models);
modelsArrayAdapter.SetDropDownViewResource (Resource.Layout.row_spinner);
modelSpinner.Adapter = modelsArrayAdapter;
if (models.Count > 0) {
modelSpinner.Enabled = true;
} else {
modelSpinner.Enabled = false;
}
}
}
protected void UpdateVersionSpinner() {
if (selectedModel != null) {
versions = VersionGeneralManager.GetFilteredVersions((List<Car>)CMob.BL.Managers.CarManager.GetCars(selectedModel));
ArrayAdapter<VersionGeneral> versionAdapter = new ArrayAdapter<VersionGeneral> (this, Resource.Layout.SpinnerText , versions);
versionAdapter.SetDropDownViewResource (Resource.Layout.row_spinner);
versionSpinner.Adapter = versionAdapter;
if(versions.Count>0)
versionSpinner.Enabled = true;
else
versionSpinner.Enabled = false;
}
}
//Generation spinner:
protected void UpdateGenerationSpinner() {
if (selectedVersion != null) {
generation = BL.Managers.GenerationManager.GetGenerations(selectedModel);
ArrayAdapter<Generation> genAdapter = new ArrayAdapter<Generation> (this, Resource.Layout.SpinnerText , generation);
genAdapter.SetDropDownViewResource (Resource.Layout.row_spinner);
generationSpinner.Adapter = genAdapter;
if (generation.Count > 0) {
generationSpinner.Enabled = true;
generationSpinner.Visibility = ViewStates.Visible;
}else {
generationSpinner.Enabled = false;
generationSpinner.Visibility = ViewStates.Gone;
}
}
}
public int getMake(){
return selectedMake.ID;
}
public string getMakeText(){
return selectedMake.Makename;
}
public string getModelText(){
return selectedModel.Modelname;
}
public string getGenerationText(){
return selectedGeneration.Generationname;
}
public int getScreenType(){
return 0;
}
protected override void OnResume()
{ UpdateCarList ();
Log.Debug ("--------", "OnResume called, app is ready to interact with the user");
base.OnResume();
}
}
}