Newb question. How can you know what the main launch Activity is? Learning Android.
Assuming this is for your code, check out the manifest.xml and look for this element:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
It should be contained within <Activity> ... </Activity> tags, and that Activity is the one that a user can launch from their phone.
You have to put the right intent tag on the activity in the manifest:
<activity android:name=".SomeActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
The main activity can be considered the one which handles the initial screen of the application you're creating.
?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="clustering.android"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10"
android:targetSdkVersion="11" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:icon="#drawable/gene_launcher"
android:label="#string/app_name" >
<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=".yourSubActivity" android:label="#string/<ActivityName>"> </activity>
...list of other activities...
</application>
</manifest>
The main activity can be found and set in AndroidManifest.xml; look for
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
The <activity> with that action is the main activity (is the entry point for the app).
You can look into AndroidManifest.xml in your porject
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
This will help you to find Launch activity.
Related
I removed these 2 lines from my android manifest file. Then I found them in internet and paste it to manifest file. And now my app can't find them. When I run my app says that there is no launcher activity and that may be I want to launch default activity.What can I do?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.amadey.myapplication3" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</intent-filter>
</activity>
<activity
android:name=".HomeScreen">
</activity>
</application>
</manifest>
You have a doubly-nested intent-filter element in your manifest:
<intent-filter>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</intent-filter>
It needs to look like this:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
Because an intent filter was surrounded with another intent filter, just like this:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
My application is installed on real device as well on emulator but it does not display on my device screen as well on emulator screen. I mean to say here that whenever an app is run or installed on a device it opens up but here my app does not open it just installed and no error are shown or forced stop is not there. I even checked my download file where every app info is shown and it is present there. Can anyone help???? Thank you in advance.
This is my Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hide"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.hide.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.hide.Info"
android:label="#string/title_activity_info" >
<intent-filter>
<action android:name="com.example.hide.Info" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.example.hide.Help"
android:label="#string/title_activity_help" >
<intent-filter>
<action android:name="com.example.hide.Help" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.example.hide.Next"
android:label="#string/title_activity_next" >
<intent-filter>
<action android:name="com.example.hide.Next" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
Make sure you specify the launcher activity for the app in your AndroidManifest.xml file:
<activity android:name=".YOURACTIVITY" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
More information here: http://developer.android.com/training/basics/activity-lifecycle/starting.html
If you have <data android:mimeType="image/*" /> in intent filter of your Launcher activity, then remove it.
just place following two lines < action and category) as:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
If you can see it in app list, but not shown on app screen, so I suppose you could be just missing 'android:icon="#drawable/your_app_icon"' setting in your manifest file.
I have 2 activity, I want to run one first. If I run this code, Console will write this: No Launcher activity found!, but i declared LAUNCHER in manifest?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.manif"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".splash"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.manif.MAIN" />
<category android:name="android.intent.category.LAUNCHER" /> //<--here is a problem, i think
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.manif.SECOND_CLASS" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
Change the action name to :
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
try to replace this
<intent-filter>
<action android:name="com.example.manif.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
with this
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
Don't use intent filter and other thing second time-
<activity
android:name=".MainActivity"
android:label="#string/app_name" />
This code is enough for second activity.
just remove tag:
<action android:name="com.example.manif.SECOND_CLASS" />
aid with this example at Return back to MainActivity from another activity
I copy that codes as follow,
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<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=".Activity1"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.ACTIVITY001" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Activity2"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.ACTIVITY002" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Activity3"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.ACTIVITY003" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
So many statements: action android:name="android.intent.action.MAIN"; if I would use their class path to instead of them, they can also do the job. what's different from these two ways?
setClass() is a explicit declaration, setAction() is a implicit declaration. It will find your target action im manifest.xml.
If the intent-filter with “android.intent.action.MAIN”, there would more entryance of your application, also you can found more icon in launcher.
its wrong
<action android:name="ACTIVITYNAME FOR INTENT" />
<category android:name=""/> // android.intent.action.DEFAULT or android.intent.action.MAIN
android.intent.action.MAIN is given to the activity wich is going to launch at first and
android.intent.action.OTHER to the rest of the activities getting called by other activities
Your application will refer to the manifest to fetch the activity for first launch , havin MAIN in it
I made a android app and it worked very well, but there are two icons in my device screen. I think it could be a AndroidManifest problem. Any idea what it could be?
This my AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="pk.aeh.ideos.taa"
android:versionCode="1"
android:versionName="1.0" >
<application
android:icon="#drawable/icon"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar" >
<activity
android:name=".Ghinho_congviecActivity"
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="Nhap_congviecActivity"></activity>
<activity android:name="Sua_congviecActivity"></activity>
<activity
android:name=".Quizzes"
android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".PlayGame" />
<activity android:name=".Result" />
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
This could be because you have declared two activities as MAIN and LAUNCHER
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
in your Androidmanifest.xml file. You need to have only one activity with these intent filters so that when the app is installed the system will know which activity is to be used as the main launcher activity.
It is. You have two of these:
<category android:name="android.intent.category.LAUNCHER" />
Get rid of the one you don't want.
You need to make these changes to your Manifest.xml
<activity
android:name=".Ghinho_congviecActivity"
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="Nhap_congviecActivity"></activity>
<activity android:name="Sua_congviecActivity"></activity>
<activity
android:name=".Quizzes"
android:launchMode="singleTask">
</activity>
I am assuming that the Activity with the attribute android:label="#string/app_name" might be your main activity.
It could be because you have changed your package name and installed it twice with different package names.
Remove the intent filter of one the activity and it would work perfectly.!
Your manifest file should only have one activity with below Intent Filter, Activity which you want to have an icon:
<intent-filter>
<action android:name = "android.intent.action.MAIN" />
<category android:name = "android.intent.category.LAUNCHER" />
</intent-filter>
Based on your description, it sounds like two activities have this line. Check your Manifest...
You can declare only one Intent filter in the activity, on AndroidManifest.
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
If you used two or more intent filter in AndroidManifest, then you will have display 2 app icon, So remove it & set one intent filter.
I hove this is usedful to you.