Android Starting an Activity from different project

Question

I have 2 projects in Eclipse. When I click on a button in project1, I want it to launch an activity from project2. how can I do that ? i tried the following code

Intent intent = new Intent(this,com.project2.tp02.MainActivity.class);
intent.setClassName("com.project2.tp02", "com.project2.tp02.MainActivity.class");
startActivity(intent);  

I get an error message telling that first application stopped. How can I lauch it properly without such error?

Thanks in advance to any helper.

---

I got it work using this :

Intent intent = new Intent();
String pkg ="com.project2.tp02";
String clazz =pkg + ".MainActivity";
intent.setComponent(new ComponentName(pkg, clazz));
startActivity(intent);

I don't understand why that way it works and not previous one, if someone can explain I will be thankfull, but anyway I got my problem solved that way.

Answer 1

This is working code to invoke an activity which is in another project.

Intent intent = new Intent();
intent.setComponent(new ComponentName("com.my.package", "com.my.package.MyClass"));
startActivity(intent);

I think your first code did not work because you provide your current activity as context of invoked activity where it is in another application.

Answer 2

            <intent-filter>
                <action android:name="com.project2.tp02.MainActivity" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>

Adding the above lines in the Manifest of your first activity might solve your problem.

Answer 3

It would be interesting what the error message is saying exactly... you do need the intent-filter as described by Swayam on the activity you want to call.

Try new Intent("com.project2.tp02.MainActivity"); to get the intent, instead of setting the class name.