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How long are you waiting?
I'm waiting so long as the timeout for the app to connect the virtual device expires, for around fifteen minutes, but in vain.
With what specs?
While creating a virtual device in AVD manager, I tried with the default specs, i.e. Android 11 API level 30, 1536 MB RAM, 384 MB VM Heap, 800 MB Internal Storage, 512 MB SD Card memory (Studio-managed). It didn't work. Thereafter, I tried with Android 5.0 API level 21 and Android 5.1 API level 22, but to no effect. In terms of memory and storage settings, I increased specs more than the default settings with 2048 MB RAM, 2048 MB VM Heap, 2048 MB Internal Storage, 2048 MB SD Card memory (Studio-managed). Result is the same black screen. Next time, I scaled down the specs way below the default settings, i.e., 500 MB RAM, 250 MB VM Heap, 500 MB Internal Storage, 250 MB SD Card memory (Studio-managed). As usual, it yielded to nothing but the same black screen. Regarding Emulated Performance Graphics, I switched between Automatic, Hardware and Software, but of no avail.
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Gone through the link you attached. But my adb.exe is in the default Android SDK directory, exactly where it's supposed to be as mentioned by the posters in that link.
C:\Users\Admin\AppData\Local\Android\Sdk\platform-tools
I don't see any discrepancy with the adb.exe. What am I missing?
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I am not an expert but I learned somewhere that you can Install HAXM and Switch to x86. Using an x86 system image can speed up the emulator. Creating an x86 AVD is simple. All you need to do is when you’re creating a new AVD, simply select the ‘x86 Images’ tab in the ‘System Image’ window.
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Thanks for your reply.
HAXM is needed in a machine that runs on an Intel processor. Mine is an AMD Phenom processor for which you need to install Android Emulator Hypervisor Driver for AMD Processors, which is the equivalent of HAXM on AMD machines. However, for diagnosis, I already installed HAXM which can be seen in the screenshot of the SDK tools of my SDK Manager here. But that didn't yield to anything.
Regarding using x86 system image, that's what I tried multiple times but with no effect. While creating a virtual device, I tried selecting the default x86 image [Release Name: R, API Level: 30, ABI: x86, Target: Android 11.0 (Google APIs)] that is available in the "Recommended" tab of the System Image window. That produced no effect other than the black emulator screen. Assuming the emulator and image specs to be too high for my RAM/PC, I scaled it down by using the following two images from the "x86 Images" tab of the System Image window as you mentioned:
1. Release Name: Lollipop, API Level: 22, ABI: x86, Target: Android 5.1
2. Release Name: Lollipop, API Level: 21, ABI: x86, Target: Android 5.0
Both yielded the same black dead emulator screen.
I tried using other non-x86 arm and armeabi images, but to no avail. None could produce any activity on the emulator screen.
As more reading on the topic brought forward, I guess, in case of AMD processors, emulator is supported only by the Ryzen series and above. Any processor below it won't work. Android emulators are developed keeping in mind Intel processors primarily. So, I believe, the only safe bet to get rid of this problem and be future-proof is to update my hardware (processor, motherboard, RAM), specifically with a contemporary Intel processor. I don't see any other solution as of now. Although, any better advice is always welcome!
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Is it possible to write an application that takes the user coordinates and puts it in uber application
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You would need to find out how the Uber app accepts its request details, and try to emulate a user doing that on the screen.
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Doesn't that app already have a "Use my location" feature?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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How can we create leitner box app in android studio ?
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By gathering your requirements, designing the application, and then writing some code. It seems you're yet to start step 1.
Zainab Hussaini wrote: leitner box app
Or maybe you should ask Bruce[^]? 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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package com.ishidakorea.test02
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import java.lang.Exception
class MainActivity : AppCompatActivity(), A.interA, Child.interChild
{
override fun Child_EventFire()
{
}
override fun A_SendPost()
{
}
override fun onCreate(savedInstanceState: Bundle?)
{
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var A1 = A()
}
}
class A : Child(), Child.interChild {
interface interA
{
fun A_SendPost()
}
lateinit var LinstenerA : A.interA
init {
LinstenerA = this@A as A.interA
}
fun FireA()
{
if (LinstenerA != null)
LinstenerA.A_SendPost()
}
override fun Child_EventFire()
{
}
}
open class Child {
interface interChild
{
fun Child_EventFire()
}
lateinit var LinstenerB : interChild
init {
LinstenerB = this@Child as interChild
}
fun Fire()
{
if (LinstenerB != null)
LinstenerB.Child_EventFire()
}
}
An error occurs while creating a new listener from a parent class that inherits a child class that has a listener.
Why is that?
If you know anyone, please advise.
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leesungyoen wrote: An error occurs
What error, and where does it occur?
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leesungyoen wrote: Why is that?
If you know anyone, please advise.
Since there are 143,213,227 possible errors, I don't think we should guess. It would help if you would post the actual error message.
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Does the message appear during compilation or execution? If the latter, should you be using try/catch blocks to help trap the error?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Hi,
In Android Studion ,<pre>why the methods are crossed out here ?
because when I insert AsyncTask the methods don't work
Select Methods to Override/Implement
--android.os.AsyncTask
--onPreExecute():void
--doInBackround(params...):Result
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Did you hover the mouse over them to see what the actual issue is? Could they be deprecated, used in the wrong context, or not inside of a try/catch block?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Something weird has happened with Android Studio. The toolbar has become "merged" with the main window's caption. Normally it would sit just below it. I've been through all of the settings I can find.
Screenshot
Any ideas?
Thanks.
DC
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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I have just upgraded and see the same thing (it's the menu not the toolbar). It looks like they are just rying to save some space.
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how to add button in the of the menu item fragment of the navigation drawer so that when the user click on the button he is redirected to anther sub fragment but one issue here is I am using the android custom navigation drawer implementation below is my try
package com.example.entertainmentlab.ui.store;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import com.example.entertainmentlab.R;
import com.example.entertainmentlab.ui.setting.SettingViewModel;
public class StoreFragment extends Fragment {
private StoreViewModel StoreViewModel;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
StoreViewModel =
ViewModelProviders.of(this).get(StoreViewModel.class);
View root = inflater.inflate(R.layout.fragment_store, container, false);
final ImageView MusicButton = root.findViewById(R.id.music_btn);
MusicButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
Fragment fragment = new BlankFragment();
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.nav_host_fragment_container, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}catch (Exception e ){
Toast.makeText(getActivity(), "erro "+e, Toast.LENGTH_SHORT).show();
}
}
});
return root;
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So what exactly is the problem?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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I have been trying FOREVER to get a simple Xamarin Forms app to call a Web API. I am running this Microsoft sample Xamarin.Forms - TodoREST - Code Samples | Microsoft Docs
The only change I made was the port number that the API uses. This line is in a constants file. The emulator uses the internal ip of 10.0.2.2:
public static string RestUrl = DeviceInfo.Platform ==
DevicePlatform.Android ?
"http://10.0.2.2:44300/api/todoitems/{0}" :
"http://localhost:44300/api/todoitems/{0}";
Here's the relevant code. The URI being passed is correct from the line above:
public async Task> RefreshDataAsync()
{
Items = new List();
Uri uri = new Uri(string.Format(Constants.RestUrl, string.Empty));
try
{
HttpResponseMessage response = await client.GetAsync(uri);
if (response.IsSuccessStatusCode)
{
string content = await response.Content.ReadAsStringAsync();
Items = JsonConvert.DeserializeObject>(content);
}
}
catch (Exception ex)
{
Debug.WriteLine(@"\tERROR {0}", ex.Message);
}
return Items;
}
It throws this exception:
{Java.Net.SocketException: Connection reset
at Java.Interop.JniEnvironment+InstanceMethods.CallIntMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0006e] in :0
at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualInt32Method (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in :0
at Java.Net.HttpURLConnection.get_ResponseCode () [0x0000a] in :0
at Xamarin.Android.Net.AndroidClientHandler+<>c__DisplayClass46_0.b__2 () [0x00000] in :0
at System.Threading.Tasks.Task`1[TResult].InnerInvoke () [0x0000f] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:534
at System.Threading.Tasks.Task.Execute () [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2319
--- End of stack trace from previous location where exception was thrown ---
at Xamarin.Android.Net.AndroidClientHandler.DoProcessRequest (System.Net.Http.HttpRequestMessage request, Java.Net.URL javaUrl, Java.Net.HttpURLConnection httpConnection, System.Threading.CancellationToken cancellationToken, Xamarin.Android.Net.AndroidClientHandler+RequestRedirectionState redirectState) [0x00372] in :0
at Xamarin.Android.Net.AndroidClientHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) [0x002d0] in :0
at System.Net.Http.HttpClient.FinishSendAsyncBuffered (System.Threading.Tasks.Task`1[TResult] sendTask, System.Net.Http.HttpRequestMessage request, System.Threading.CancellationTokenSource cts, System.Boolean disposeCts) [0x0017e] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/System.Net.Http/src/System/Net/Http/HttpClient.cs:506
at TodoREST.RestService.RefreshDataAsync () [0x0006b] in C:\Projects\SandBox\Xamarin\Mirosoft Examples\Web Services\ToDoREST\TodoREST\Data\RestService.cs:30
--- End of managed Java.Net.SocketException stack trace ---
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:209)
at java.net.SocketInputStream.read(SocketInputStream.java:139)
at com.android.okhttp.okio.Okio$2.read(Okio.java:136)
at com.android.okhttp.okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
at com.android.okhttp.okio.RealBufferedSource.indexOf(RealBufferedSource.java:306)
at com.android.okhttp.okio.RealBufferedSource.indexOf(RealBufferedSource.java:300)
at com.android.okhttp.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:196)
at com.android.okhttp.internal.http.Http1xStream.readResponse(Http1xStream.java:186)
at com.android.okhttp.internal.http.Http1xStream.readResponseHeaders(Http1xStream.java:127)
at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:737)
at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:609)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:471)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:407)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:538)
}
Can anyone help? All I want is to call into a Rest API can get data back.
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
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Have you allowed traffic to that port in the Windows Firewall?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Do I need to do that on my Dev PC using the Xamarin Forms emulator?
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
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