Develop Reference

Installing the debug apk shows up as two apps?

So I am very new to android programming and I was installing a basic app I just built on my android device and I find that it always seems to install two "instances" of the app ? Here is a screenshot of what I am looking at [The two instances are of the SR520 app] :
I did some research and it seems like it could be due to the android manifest file but I am not exactly sure what I should change in it. This is what my manifest file looks like
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".SplashActivity" android:theme="#style/SplashTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Some suggestions would be much appreciated.

Ok I guess I needed to delete this section
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
That fixed the issue.

Android Studio generates three separate apps after I compiled and ran in the android emulator

I have upgraded my Android studio.
I think there is something different from the previous version
When I finished writing the code and compile then run. I look something different like this:
Whether it's something new or I destructive my android studio settings

May be you create multiple intent-filter in android AndroidManifest.xml.

this is happening because you have posted below code in three different activities in AndroidManifest.xml file.
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
the mistake you have done is like below in AndroidManifest.xml file:
<activity
android:name=".SplashActivity"
android:launchMode="singleTop"
android:screenOrientation="sensorPortrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".HomeActivity"
android:launchMode="singleTop"
android:screenOrientation="sensorPortrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:screenOrientation="sensorPortrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

How to remove splash activity from an existing project?

I have an existing Android Studio project and i wanted to remove splash screen. I tried to remove changes in AndroidManifest.xml but couldn't make it.
Here this my actual AndroidManifest.xml
<!-- Home Tab Group -->
<activity
android:name=".view.TabHomeActivity"
android:label="#string/app_name"
android:windowSoftInputMode="adjustPan|stateHidden" >
</activity>
<activity
android:name=".view.activity.SplashActivity"
android:label="#string/app_name"
android:windowSoftInputMode="adjustPan|stateHidden" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".view.activity.TestLoginFacebookActivity"
android:configChanges="keyboardHidden|orientation"
>
</activity>
<!-- Tab Screen -->
<activity android:name=".view.tabscreen.TabHomeScreen"
android:windowSoftInputMode="stateAlwaysHidden|adjustResize" />

Delete the SplashActivity class,delete it from the manifest. Set the Launching Activity first which you want to come as your first screen
<activity
android:name=".view.TabHomeActivity"
android:label="#string/app_name"
android:windowSoftInputMode="adjustPan|stateHidden" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".view.activity.TestLoginFacebookActivity"
android:configChanges="keyboardHidden|orientation"
>
</activity>

Delete the SplashActivity class,
delete it's layout,
delete it from the manifest.
Add the intent filters to your TabHomeActivity.
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

Default Activity not found Waiting for process

When I am trying to debug-run my application I am getting this error in console:
Default Activity not foundWaiting for process: com.myapp.myapp
My AndroidManifest look like this:
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name="com.myapp.myapp.Splash"
android:label="#string/app_name"
android:noHistory="true">
<intent-filter>
<action android:name="android.intent.action.Main" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.myapp.myapp.Main"
android:label="#string/app_name"
android:launchMode="singleInstance"
android:windowSoftInputMode="adjustPan">
<intent-filter>
<action android:name="android.intent.action.Main" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
This doesn't work for me because I can't find any sources tab as mentioned there.

For the second activity, in intent filter, change android:name to com.myapp.myapp.Main .

No Launcher activity found

I can't find any problem but it keep giving me the error "No Launcher activity found!" and "The launch will only sync the application package on the device!"
can anyone solve this problem???
This is my Maniest
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.saikoro.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.example.saikoro.StartUp"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.saikoro.StartUp" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

The <activity> element of the activity you want to launch through the icon on the app list must contain both of the following parts of the intent-filter:
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.intent.action.MAIN" />
</intent-filter>
Your current manifest has an activity with category LAUNCHER and action MAIN, but in different activities. The one with the icon in the app list must have them both.

Change
<action android:name="com.example.saikoro.StartUp" />
with
<action android:name="android.intent.action.MAIN" />