Question

I have activity A in package one, and I want to run an intent which will up an activity B which is in package two.

How can I do this? Any samples will be welcome.

this is what ive done, and the error i get:

first activity (“MainActivity”) in a package: com.abelski.currencyclient
and second activity(“SecondActivity” in a diffrent package: com.idan.second

now i wanna call from MainActivity to SecondActivity.

ive added this line at the manifest of the MainActivity:

 <activity android:name="com.idan.second.SecondApplicationActivity"></activity>

now in main Activity i got this button which run this line:

Intent intent = new Intent(MainActivity.this,SecondApplicationActivity.class); 

and this is the rror:

04-29 09:20:59.197: ERROR/AndroidRuntime(399): Uncaught handler: thread main exiting due to uncaught exception
04-29 09:20:59.276: ERROR/AndroidRuntime(399): java.lang.NoClassDefFoundError: com.idan.second.SecondApplicationActivity
04-29 09:20:59.276: ERROR/AndroidRuntime(399):     

Answer 1

I am assuming that by “packages” you mean applications.

We have:
– ApplicationA with FirstActivity
– ApplicationB with SecondActivity

If, in the ApplicationB’s AndroidManifest.xml file, in the declaration of SecondActivity you add an intent filter such as:

<activity android:name=".SecondActivity">
  <intent-filter>
    <action android:name="applicationB.intent.action.Launch" />
    <category android:name="android.intent.category.DEFAULT" />
  </intent-filter>
</activity>

You can create an Intent to launch this SecondActivity from the FirstActivity with:

Intent intent = new Intent("applicationB.intent.action.Launch");
startActivity(intent);

What this all means is:

• The SecondActivity has a filter for the intent action of “applicationB.intent.action.Launch”
• When you create an intent with that action and call ‘startActivity’ the system will find the activity (if any) that responds to it

The documentation for this is at: https://developer.android.com/reference/android/content/Intent.html