Develop Reference

App icon not visible when code is run

I have created an android app using android studio. When i run my code on the IDE, its runs as expected on the connected phone. The problem is, it does not leave behind an icon on my phone to use it next time. I will again have to run from android studio to use the app. This was fine initially, i don't realize what made the icon vanish. The app is also present in the settings.
When i go to
Settings->apps
i can very well find my app over there. It is not disabled. I tried uninstalling the app and trying again. It still doesn't give me the icon.
I cleared defaults, forced closed and tried everything possible. Nothing is helping me.
Please help.
My AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".TwitterLogin"
android:label="#string/title_activity_twitter_login" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data
android:host="www.chillumapp.com"
android:pathPrefix="/chillum"
android:scheme="http" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
</activity>
<activity
android:name=".NextActivity"
android:label="#string/title_activity_next" >
</activity>
<meta-data
android:name="io.fabric.ApiKey"
android:value="b1fe9f0c7d80c3c24879d634b199f2d0e474b4ba" />
<activity
android:name=".WebViewActivity"
android:label="#string/title_activity_web_view" >
</activity>
</application>
</manifest>

You should specify a different for every intent that can launch your app. So one for the BROWSER category with your url data, and one for the LAUNCHER category.
From the App Manifest Guide.
Components advertise their capabilities — the kinds of intents they can respond to — through intent filters. Since the Android system must learn which intents a component can handle before it launches the component, intent filters are specified in the manifest as elements. A component may have any number of filters, each one describing a different capability.
Your code would become something like:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data
android:host="www.chillumapp.com"
android:pathPrefix="/chillum"
android:scheme="http" />
</intent-filter>

Titanium Android activity not maintaining state

I am trying to set up a mobile website that opens my mobile app when a link is clicked in the Android browser. To accomplish this task, I added an intent filter to AndroidManifest.xml, as seen in the code below:
<activity android:name=".MyAppActivity" android:label="#string/app_name" android:theme="#style/Theme.Titanium" android:configChanges="keyboardHidden|orientation" android:alwaysRetainTaskState="true" android:launchMode="singleInstance">
<intent-filter>
<data android:scheme="myapp" android:host="app"/>
<action android:name="android.intent.action.MAIN"/>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.LAUNCHER"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
</intent-filter>
</activity>
The link itself in the browser works great, and I'm easily able to gather parameters when the app is first opened using Ti.Android.currentActivity. The problem comes when the app is already open, but a user clicks the link to open it from within the mobile browser. When my app opens, instead of resuming where I left off before, I simply see the splashscreen. This goes both ways: If I opened the app first from the mobile browser, then tried to resume it later from the Android homescreen or app drawer, I only see the splash screen. Per tips I saw on other places of the internet, I tried adding the code below to AndroidManifest.xml (as seen above):
android:alwaysRetainTaskState="true" android:launchMode="singleInstance"
This however, appears to have no effect on anything, and the same problem persists. What am I missing here? Any help would be greatly appreciated.

The way i have done was like this
<android xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="18"/>
<manifest android:installLocation="preferExternal"
android:versionCode="1" android:versionName="1.0">
<uses-permission android:name="android.permission.CALL_PHONE"/>
<application android:label="App Name" android:largeHeap="true">
<activity
android:configChanges="keyboardHidden|orientation|screenSize"
android:label="#string/app_name"
android:launchMode="singleTop"
android:name=".mainActivity" android:theme="#style/Theme.Titanium">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
<data android:scheme="schemaname"/>
</intent-filter>
</activity>
</application>
</manifest>
</android>
and its working fine for me . for Android 4.XX

Launcher app not in chooser

I'm in the process of making a Launcher app, but I can't get my app to show up in the activity chooser when the home button is pressed. I'm sure I'm just missing something simple, but I can't find it! Here's my manifest file:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.espian.jump"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="16" android:targetSdkVersion="17" />
<application
android:label="#string/app_name"
android:icon="#drawable/ic_launcher">
<activity
android:name="JumpActivity"
android:label="#string/app_name"
android:theme="#android:style/Theme.Holo.NoActionBar"
android:launchMode="singleTask"
android:clearTaskOnLaunch="true"
android:stateNotNeeded="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

Try replacing that
<category android:name="android.intent.category.LAUNCHER"/>
with
<category android:name="android.intent.category.DEFAULT"/>
As it says in the android intent filter documentation:
activities that are willing to receive implicit intents must include
"android.intent.category.DEFAULT" in their intent filters
Actually I'd suggest opening that page and searching for that text, and having a little read around it. I think you'll find these categories make a lot more sense if you do. You're specifying that this appears in the launcher instead.

android multiple activity declaration in manifest

I have a main activity. From it, I am calling 2 other sub activities called FacebookLogin and Twitterlogin. I am using the following code in AndroidManufest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.examples.Kikin" android:versionCode="1"
android:versionName="1.0">
<!-- THIS IS THE BEGINNING OF SHARING LINKS FROM THE BROWSER -->
<application android:icon="#drawable/kikinlogo"
android:label="#string/app_name" android:debuggable="true">
<activity android:name=".Kikin" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<intent-filter android:label="#string/app_name">
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
</activity>
<activity android:name=".FacebookLogin" android:label="#string/app_name">
<intent-filter android:label="#string/app_name">
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<!-- <data android:mimeType="image/png" /> -->
</intent-filter>
</activity>
<activity android:name=".TwitterLogin" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.VIEW"></action>
<category android:name="android.intent.category.DEFAULT"></category>
<category android:name="android.intent.category.BROWSABLE"></category>
<data android:scheme="yourapp" android:host="twitt"></data>
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />
Am i doing it right?
Should i nest the FacebookLogin and TwitterLogin activities in the main activity?
The aforesaid 2 classes are in the package com.examples..
* is the same wherever used.

The labels for your FacebookLogin and TwitterLogin appear to be missing an '#' - change them to android:label="#string/app_name"

There's no such thing as a "subactvity". Just because you call one activity from another doesn't mean it's a "subactivity".
You can't nest activity tags in the manifest and you'd probably get a compile error if you tried.
in manifest you can set only one activity in launcher tag okay android does support multiple launcher activity.

The manifest you posted looked fine.
But regarding your comment about the error message "Have you declared this activity in AndroidManifest.xml?", you need to check carefully the package and class name of the Activity you are trying to launch, and make sure that it matches the <activity android:name> you have written in the manifest.
All the info you need should be in the error message.

Don't nest activity declarations, just have them all as elements in your application element:
<manifest ...
<application ...
<activity ...
</activity>
<activity ...
</activity>
<activity ...
</activity>
</application>
</manifest>
The sample you posted here (indenting aside) looks fine.

Maybe you have tested it already but just try declaring your activities with the full path (although you have already declared it in the package tag). So, instead of using
<activity android:name=".TwitterLogin" />
use
<activity android:name="com.examples.Kikin.TwitterLogin" />
Sometimes problems are caused because of that.
I know this is an old thread but Im having the same problem and in my case specifying full package name doesnt help. Have you already found a solution? I`m really interested in knowing how to avoid this error.

One application installed, show two entries in launcher

In Android, how to implement the following effect?
Install just one application, but in the launcher, there are two entries, and entering each will go to different ui.
Just like google map, you can see only one application, but there are map and navigation entries.
Thanks.

You need to add category as android.intent.category.LAUNCHER for both of the activities in AndroidManifest.xml
Example:
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".MyActivity1" android:label="#string/app_name">
<intent-filter>
....
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MyActivity2" android:label="#string/app_name">
<intent-filter>
....
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>