Develop Reference

Android if my launcher has not started and pressing home button

I've developed a launcher. In my device, there are 3 launcher with my application and the default launcher of Android. If I have not launched my application before, when I press home, my application appears on the launcher list. So, when I touch my launcher, it occurs error because of I didn't start it before. What can I do to solve this problem?
My manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.comeks.deneme"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.comeks.deneme.Main"
android:label="#string/app_name"
android:screenOrientation="landscape"
android:excludeFromRecents="true" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:label="#string/app_name"
android:name=".main.java"
android:excludeFromRecents="true" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>

What is the name of the file of your second activity?
main.java.java?
Do you even have two different activities?

A little error in Android launcher

I install my launcher on my device. If I press home button and select my launcher always without opening my application, everything's OK. However, when firstly I start my application, then press home and select my launcher, it opens my application again and again. What should I do?
My manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.comeks.cocuktab"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.comeks.cocuktab.Main"
android:label="#string/app_name"
android:screenOrientation="landscape" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

No sure if it is your problem but try to but this in your aplication:
in Manifest:
<activity
android:noHistory="true"
android:excludeFromRecents="true">

Try adding this line in the manifest
<activity
android:launchMode="singleInstance"

Android launch icon doesn't work

I'm having problems with setting my launcher icon from my android app.
As you can see, i've named the logo logodoor.png in the folder drawable (too in drawable hdpi, ldpi, etc.), and in AndroidManifest.xml drawable/logodoor
When starting up the app, it won't show the right launch icon, but the standard no-icon-android-icon.
-> On the target device the icon isn't displayed good; like there is a logo for twitter too
thanks for your answer :)
Menno
Manifest code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="me.menno.ghlyceum" android:versionCode="1" android:versionName="1.0.4">
<uses-permission android:name="android.permission.INTERNET"/>
<application android:icon="#drawable/logodoor" android:label="Ghlyceum OB" android:theme="#android:style/Theme.Black.NoTitleBar" android:debuggable="false">
<activity android:name=".MainActivity" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Notes" />
<activity android:name=".Help"></activity>
<activity android:name=".Rooster"></activity>
</application>
</manifest>

are you sure you have something like this:
<application
android:icon="#drawable/logodoor"
............>
</application>

<application
android:icon="#drawable/logodoor"
android:label="#string/app_name" >
<activity
android:name="YourActivityname"
android:label="#string/title_activity_flash_file" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
This way you can put your my launcher icon in manifest.

Sometimes I've had to uninstall the app for the icon to change

<application android:icon="#drawable/icon"
android:label="#string/app_name"

exported apk showing activities when installed

I have exported an app with 3 activities (main, splash and another activity called "about") to an apk file. It works fine when tested on the emulator. After uploading to the Play Store and then downloading to my own phone, it installs fine on my phone. Good so far. However, the apk doesn't appear packaged - it's showing the separate activities and not starting with the splash screen as it did in the emulator. What could be the problem? It exported with no errors. When I was exporting, I gave the apk a name that was different than the package name in the manifest. Would this cause the problem? Here is the manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.spinner"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar" >
<activity
android:name=".SplashActivity"
android:label="#string/title_activity_splash" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".AboutActivity"
android:label="#string/title_activity_about" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Thank you for looking.

This intent-filter
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
tells Android launcher app to show icon associated with Activity this filter is attached to on its Launcher screen. When corresponding icon is tapped by user, launcher app starts that activity and your code is executed. You usually want one entry point in your application so edit your Manifest file and ensure only one Activity element uses it. In your case, I guess leave it for SplashActivity and remove from others. It should look like this:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.spinner"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar" >
<activity
android:name=".SplashActivity"
android:label="#string/title_activity_splash" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
</activity>
<activity
android:name=".AboutActivity"
android:label="#string/title_activity_about" >
</activity>
</application>
</manifest>
I'd also get rid of android:label from <activity> elements (just leave for <application>)

Android manifest.xml problems

Following this: http://developer.android.com/training/basics/firstapp/starting-activity.html I am confused when editing the Android Manifest.xml file. It says that the file should contain this:
<application ... >
<activity android:name="com.example.myapp.DisplayMessageActivity" />
...
</application>
My android manifest.xml looks like this:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nick.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="4"
android:targetSdkVersion="15" />
<application android:label="#string/app_name">
<activity android:name="com.nick.myfirstapp.DisplayMessageActivity" />
...
</application>
</manifest>
and when I run the app everything goes fine except it says : "No Launcher activity found!
The launch will only sync the application package on the device!" Is this something missing from the android manifest.xml file?

declare Your Activity in AndroidManifest.xml as for Showing In Launcher as:
<application android:label="#string/app_name">
<activity android:name="com.nick.myfirstapp.DisplayMessageActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
see for more info how we set an activity which so in Launcher :
http://developer.android.com/reference/android/content/Intent.html
http://developer.android.com/reference/android/app/Activity.html

You need to change you manifest to the following. Doing this will tell Android that you want this Activity to be displayed in the Launcher using your icon.
<application android:label="#string/app_name" android:icon="drawable icon resource here">
<activity android:name="com.nick.myfirstapp.DisplayMessageActivity" android:label="Your Label">
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
In the docs the used ... to show that your normal code goes here. What you're doing is fine for non-launcher Activities.

You are missing the launcher intent and therefore the app finds no activity to launch at the start.
You need to lay out the activity like so:
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

package="com.example.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.myfirstapp.DisplayMessageActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>