android - how to find the name of the main activity of an application?

Question

For example, I want to start Gmail in code/command line, but I don't know its main activity name.

am start -n com.google.android.gm/.XXXXX

It's available through decompiling the apk, but it's difficult.

Answer 1

This can be found in the application's manifest.

The main activity is the activity with the intent-filter whose name is android.intent.action.MAIN.

Answer 2

You can plug your phone into the computer and look at the DDMS log, application launches are printed there, e.g:

05-11 09:19:15.725: INFO/ActivityManager(96): Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x2000000 cmp=com.google.android.gm/.ConversationListActivity bnds=[125,410][235,540] } from pid 2457

So, com.google.android.gm/.ConversationListActivity, would seem like the right choice, at least, that's what the icon seems to launch.

Answer 3

Step1: Start "adb logcat" in command prompt.

Step2: Open the app (either in emulator or real device)

Answer 4

Just go to Android package n open Android Manifest File n check out this activity element

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

Answer 5

You don't need to know it's name, instead you should use implicit intent and specify action along with type and some extras, for example

            final Intent intent = new Intent();
            intent.setType("message/rfc822");
            intent.setAction(Intent.ACTION_SEND);
            intent.putExtra(Intent.EXTRA_SUBJECT, "Some subject");

System will search for components available to run this intent.