Android developer page for <application> contains the flag hasCode. Its description says:
An application would not have any code of its own only if it's using
nothing but built-in component classes, such as an activity that uses
the AliasActivity class, a rare occurrence.
Can someone please give a code example of the AliasActivity use case (rare occurence) they talk about ?
An AliasActivity is - as the name suggests - just an alias to another activity.
You can create one just in XML. There is an example available in the Android git repository.
You manifest could look like this:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.aliasactivity">
<application android:hasCode="false" android:label="#string/app_label">
<activity android:name="android.app.AliasActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<meta-data android:name="android.app.alias"
android:resource="#xml/alias" />
</activity>
</application>
</manifest>
In res/xml/alias.xml you define the intent:
<alias xmlns:android="http://schemas.android.com/apk/res/android">
<intent android:action="android.intent.action.VIEW"
android:data="http://www.google.com/">
</intent>
</alias>
I'm having an issue trying to go to a specific class within my android application using the Intent.
This is my code setup:
Intent Secondscreenintent = new Intent(this, Secondscreen.class);
The error that it gives me is
android.content.ActivityNotFoundException: Unable to find explicit activity class {/project10.aventus.quiz.Secondscreen}; have you declared this activity in your AndroidManifest.xml?
After looking at my manifest I could not see any mistakes that would indicate this message.
<activity
android:name=".Main"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="Quiz">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Secondscreen"
android:label="Secondscreen" />
<activity
android:name=".Quizclass"
android:label="Quizclass"/>
These are within the tag within the tag.
But somehow I'm still getting the class not found error. I have even tried to refer the intent to the Main.class and this has given the same error that it cannot find the Main class.
Does anyone have an idea on how to fix this?
Thanks,
Shams.
In you AndroidManifest.xml you will find some thing like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="project10.aventus.quiz"
android:versionCode="1"
android:versionName="your_version_code">
...
</manifest>
package defines the root of your implementation. So you don't have to write the full path name if you define Activities, BroadCastReceiver etc...
So you do it in this way:
<activity
android:name=".Secondscreen"
android:label="Secondscreen" />
This entry means - you will find my Secondscreen.java in my root folder aka package. In your case it would be project10.aventus.quiz.
So i quess your Secondscreen.java is not there. I'm creating allways a new subpackage ui in my root folder, so my activity entry looks like this:
<activity
android:name=".ui.Secondscreen"
android:label="#string/second_screen"
android:screenOrientation="portrait" >
</activity>
Now, this entry means - you will find my Secondscreen.java here: project10.aventus.quiz.ui.Secondscreen.java
Situation:
I need to combine several apps into one .apk app. Lets say implement app2 into app1
What i have done:
Copied app2 package into main app1 project which i am working, so my app1 has two packages.
app2 had this manifest file:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.package.app2" android:versionCode="3" android:versionName="1.2">
<application android:label="App2" android:icon="#drawable/icon">
<activity android:name="Activity1" 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="Activity2" android:excludeFromRecents="true"></activity>
</application>
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
<uses-permission android:name="android.permission.VIBRATE"></uses-permission>
</manifest>
My original App1 manifest file:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.package.app1">
<application android:icon="#drawable/icon" android:debuggable="true">
<activity android:name=".Start" 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="com.package.app1.PlayerList" />
<activity android:name="com.package.app1.CreateNewPlayer" />
<activity android:name="com.package.app1.Profile" />
<activity android:name="com.package.app1.Braintrainer" />
</application>
</manifest>
The code in app1 i am using to call activity in app2 package:
Intent i = new Intent();
i.setClassName("com.package.app1", "com.package.app2.Activity1");
startActivity(i);
The question:
How do i modify my app1 manifest file to have activities of app2.
Things i`ve tried:
It works if i create simple HelloWorld test class in app2, call using the same code and just include this in the app1 manifest:
<activity android:name="com.package.app2.Test" />
But i can not figure out how to implement the app2 manifest file into the first one. Every way i try give no errors but crashes when calling that activity. App2 alone works fine, so problem not in the activity file.
Appreciate any thoughts on this.
Intent i = new Intent();
i.setClassName("com.package.app1", "com.package.app2.Activity1");
startActivity(i);
Shot in the dark:
change com.package.app1 to com.package.app2. I've called done what you're attempting right now, and I've always had to specify the package of the class I wanted to call.
Ok, PackageManager is not your solution, I misread and thought you had two apps and wanted one app to call the other. It looks like you just want one app.
Modify your app1's manifest like this:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.package.app1">
<application android:icon="#drawable/icon" android:debuggable="true">
<activity android:name=".Start" 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="com.package.app2.Activity1" />
<activity android:name="com.package.app2.Activity2" android:excludeFromRecents="true"></activity>
<activity android:name="com.package.app1.PlayerList" />
<activity android:name="com.package.app1.CreateNewPlayer" />
<activity android:name="com.package.app1.Profile" />
<activity android:name="com.package.app1.Braintrainer" />
</application>
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
<uses-permission android:name="android.permission.VIBRATE"></uses-permission>
</manifest>
And try the first way again.
I have several packages and need to do something similar in my app.
You need to be careful with this technique, otherwise you'll experience nasty memory leaks.
I declared my activity in my base controller (activity) class as a static variable. All controller classes inherit from this class, so all controller classes are able to access it. Pass in the activity as an argument for anything outside of the controller classes that need to access the activity.
I am writing a simple program of Android, and getting these no errors, I don't know what they are. My program is right, but showing not output.
I think it is because of these two lines:
[2005-01-06 19:56:38 - my_Android] No Launcher activity found!
[2005-01-06 19:56:38 - my_Android] The launch will only sync the application package on the device!
Here's an example from AndroidManifest.xml. You need to specify the MAIN and LAUNCHER in the intent filter for the activity you want to start on launch
<application android:label="#string/app_name" android:icon="#drawable/icon">
<activity android:name="ExampleActivity"
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>
Multiple action tags in a single intent-filter tag will also cause the same error.
Like Gusdor said above, "Multiple action tags in a single intent-filter tag will also cause the same error." (Give him the credit! I could just kiss Gusdor for this!)
I didn't find any docs for this fact!
I had added a new (USB) action and being clever, I lumped it in the same intent-filter. And it broke the launch.
Like Gusdor said, one intent filter, one action!
Apparently each action should go in its own intent filter.
It should look like this...
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>
When I did this, WAZOO! it worked!
Do you have an activity set up the be the launched activity when the application starts?
This is done in your Manifest.xml file, something like:
<activity android:name=".Main" android:label="#string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Check your manifest.xml. Make sure you have the category LAUNCHER there.
<activity android:name=".myActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
It means you didn't specify an Activity for Android to launch as the default when the app opens from the launcher. You have to add an Intent Filter in the Manifest for the Activity you would like to act as the default when the app is being launched.
Read http://developer.android.com/guide/topics/intents/intents-filters.html#ccases for more details.
I fixed the problem by adding activity block in the application tag. I created the project using wizard, I don't know why my AdroidManifest.xml file was not containing application block? I added the application block:
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name=".ToDoListActivity"
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>
And I get the desired output on the emulator.
As has been pointed out, this error is likely caused by a missing or incorrect intent-filter.
I would just like to add that this error also shows up if you set android:exported="false" on your launcher activity (in the manifest).
I had this same problem and it turns out I had a '\' instead of a '/' in the xml tag. It still gave the same error but just due to a syntax problem.
If you are using the standard eclipse IDE provided by google for Android development, you can check the "Launcher Activity" check-box while creating a new Activity. Please find below:
In Eclipse when can do this:
But it is preferable make the corresponding changes inside the Android manifest file.
You missed in specifying the intent filter elements in your manifest file.Manifest file is:
<application android:label="#string/app_name" android:icon="#drawable/icon">
<activity android:name="Your Activity Name"
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>
Add and check this correctly. Hope this will help..
Manifest is case sensitive, so please compare this lines for any case mismatch especially the word MAIN in:
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
You can add launcher to activity in eclipse manifest visual editor:
MAIN will decide the first activity that will used when the application will start.
Launcher will add application in the application dashboard.
If you have them already and you are still getting the error message but maybe its because you might be using more than more category or action in an intent-filter. In an intent filter there can only be one such tag. To add another category, put it in another intent filter, like the following
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<!--
TODO - Add necessary intent filter information so that this
Activity will accept Intents with the
action "android.intent.action.VIEW" and with an "http"
schemed URL
-->
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<data android:scheme="http" />
<category android:name="android.intent.category.BROWSABLE" />
</intent-filter>
just add this to your aplication tag in AndroidManifest.xml file
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
and also edit the uses-sdk tag from android:targetSdkVersion="16" to 17
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
You have not included Launcher intent filter in activity you want to appear first, so it does not know which activity to start when application launches, for this tell the system by including launcher filter intent in manifest.xml
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.