App completely restarting when launched by icon press in launcher

Question

I\'m in the process of trying to make a release build of my first android app to send to a few testers. However, I ran into a problem with it. When you exit the app and then

Answer 1

For me, I found that I had erroneously posted NoHistory = true in my activity attribute

[Activity(NoHistory = true, ScreenOrientation = ScreenOrientation.Landscape)]

This prevented the app resuming into this activity and restarted

Answer 2

All of the solutions above didn't work consistently on all of my devices. It worked on some Samsung but not all.

The cause of the problem for me was installing the APK manually.

Answer 3

Add this to your first activity:

if (!isTaskRoot()) {
        finish();
        return;
}     
super.onCreate(savedInstanceState);

Answer 4

You could use launchMode as singleTop to the Launcher Activity in AndroidManifest.xml

       <activity
        android:name="<YOUR_ACTIVITY>"
        android:label="@string/app_name"
        android:launchMode="singleTop">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

Answer 5

For me the fix was adding LaunchMode = LaunchMode.SingleTop to my Activity attribute over the Main Activity:

/// <summary>
    /// The main activity of the application.
    /// </summary>
    [Activity(Label = "SilhuettePhone",
        Icon = "@drawable/icon",
        Theme = "@style/MainTheme",
        MainLauncher = true,
        ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation,
        ScreenOrientation = ScreenOrientation.Portrait,
        LaunchMode = LaunchMode.SingleTop,
        WindowSoftInputMode = SoftInput.AdjustResize)]

Answer 6

 // To prevent launching another instance of app on clicking app icon 
        if (!isTaskRoot()
                && getIntent().hasCategory(Intent.CATEGORY_LAUNCHER)
                && getIntent().getAction() != null
                && getIntent().getAction().equals(Intent.ACTION_MAIN)) {

            finish();
            return;
        }

write the above code in your launcher activity before calling setContentView. This will solve the problem