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.
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6 Answers
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.
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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.
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Kenny83
Ahh great, no worries! So I just plug my phone in, run some completely unknown command, and voila! It just works like magic, huh??
Step1: Start "adb logcat" in command prompt.
Step2: Open the app (either in emulator or real device) 
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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.
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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> 
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In continuation to the previous answers above I'd like to extend it to what helped me by combining it.
I searched the AndroidManifest.xml file for android.intent.action.MAIN (Tony the pony) and used the name attribute in the following command run on the actual device and executed the app:
$ adb logcat | grep "com.some.interesting.app" 10-23 14:53:34.795 10568 12967 W RecentsModel: getRunningTask taskInfo=TaskInfo{userId=0 taskId=286 displayId=0 isRunning=true baseIntent=Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.some.app/com.some.interesting.app.splash.SplashActivity } baseActivity=ComponentInfo{com.some.app/com.some.interesting.app.splash.SplashActivity} topActivity=ComponentInfo{com.some.app/com.some.interesting.app.main.MainActivity} origActivity=ComponentInfo{com.some.app/com.some.interesting.app.splash.SplashActivity} realActivity=ComponentInfo{com.some.app/com.some.interesting.app.main.MainActivity} numActivities=1 lastActiveTime=3026326848 supportsSplitScreenMultiWindow=true supportsMultiWindow=true resizeMode=2 isResizeable=true token=WCT{android.window.IWindowContainerToken$Stub$Proxy@feba6cc} topActivityType=1 pictureInPictureParams=PictureInPictureParams( aspectRatio=null sourceRectHint=null hasSetActions=false isAutoPipEnabled=false isSeamlessResizeEnabled=true) displayCutoutSafeInsets=Rect(0, 94 - 0, 0) topActivityInfo=ActivityInfo{1f05d15 com.some.interesting.app.splash.SplashActivity} launchCookies=[] positionInParent=Point(0, 0) parentTaskId=-1 isFocused=false isVisible=true topActivityInSizeCompat=false locusId= null windowMode=0} 10-23 14:53:34.958 10568 10568 D RecentsImpl: mActivityStateObserver com.some.interesting.app.main.MainActivity 10-23 14:53:34.958 10568 10568 W RecentsImpl: onResumed className=com.some.interesting.app.main.MainActivity mIsInAnotherPro=false isKeyguardLocked=false from the above output the cmp=com.some.app/com.some.interesting.app.splash.SplashActivity is actually what we're lookingn for.
So if you execute:
$ am start com.some.app/com.some.interesting.app.splash.SplashActivity or
$ am start com.some.app/com.some.interesting.app.main.MainActivity The app will execute in the device.
