Change application's starting activity

user_233971 0
Viewed 661220

I have created the meat and guts of my application but I want to add a different activity that will be the starting point (sort of a log-in screen).

Couple questions:

  • 1 I have a fairly decent handle on how to switch between activities (based on this article: http://www.linux-mag.com/id/7498) but I'm not sure how to go about creating a new one (with eclipse).

  • 2 Once I have a new activity created, how can I set it as the default activity of my application? I presume I could just change the name of the classes...but is there a more elegant way to handle that (maybe within the AndroidManifest.xml)?

android-activity android
13 Answers
 <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
user_74134800

You add this you want to launch activity android:exported="true" in manifest file like

 <activity
      android:name=".activities.activity.MainActivity"
      android:windowSoftInputMode="adjustPan"
      android:exported="true"/>
  <activity

Open java file of this activity and right click then click on Run 'main Activity'

OR

Open java file of this activity and press Ctrl+Shift+F10.

user_103667570

In a recent project I changed the default activity in AndroidManifest.xml with:

<activity android:name=".MyAppRuntimePermissions">
</activity>

<activity android:name=".MyAppDisplay">
    <intent-filter>
        <action android:name="android.intent.activity.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

In Android Studio 3.6; this seems to broken. I've used this technique in example applications, but when I use it in this real-world application it falls flat. The IDE once again reports:

Error running app: Default activity not found.

The IDE still showed a configuration error in the "run app" space in the toolbar (yellow arrow in this screenshot)

Error in "run app" configuration

To correct this error I've tried several rebuilds of the project, and finally File >> "Invalidate Cache/Restart". This did not help. To run the application I had to "Edit Configurations" and point at the specific activity instead of the default activity:

Edit configuration dialog box

user_6991800

In AndroidManifest.xml

I changed here the first activity to be MainActivity4 instead of MainActivity:

Before:

    <activity android:name=".MainActivity" >
       <intent-filter>
           <action android:name="android.intent.action.MAIN" />
          <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".MainActivity2" />
    <activity android:name=".MainActivity3" />
    <activity android:name=".MainActivity4" />
    <activity android:name=".MainActivity5" />
    <activity android:name=".MainActivity6"/>

After:

    <activity android:name=".MainActivity" />
    <activity android:name=".MainActivity2" />
    <activity android:name=".MainActivity3" />
    <activity android:name=".MainActivity4" >
       <intent-filter>
           <action android:name="android.intent.action.MAIN" />
          <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".MainActivity5" />
    <activity android:name=".MainActivity6"/>
user_140318020

For anyone getting errors in their debug\AndroidManifest.xml file make sure that you include the tag! "<activity android:name=".MainActivity>"

For example:

<activity android:name=".MainActivity"><intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
</intent-filter></activity>
user_142033450
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