How to start activity in another application

Question

I have application A defined as below    lt application android icon   drawable icon  android label   string app name  gt       lt activity android name  com example MyExampleActivity                android label   string app name  gt           lt intent-filter gt               lt action android name  android intent action MAIN    gt               lt category android name  android intent category LAUNCHER    gt           lt  intent-filter gt       lt  activity gt   lt  application gt    Now in application B  how can I write the code to start the activity in application A  Thanks

User · Answer

If both application have the same signature (meaning that both APPS are yours and signed with the same key), you can call your other app activity as follows:

Intent LaunchIntent = getActivity().getPackageManager().getLaunchIntentForPackage(CALC_PACKAGE_NAME);
startActivity(LaunchIntent);

Hope it helps.

User · Answer

If you guys are facing  Permission Denial  starting Intent     error or if the app is getting crash without any reason during launching the app - Then use this single line code in Manifest   android exported  true      Please be careful with finish      if you missed out it the app getting frozen  if its mentioned the app would be a smooth launcher    finish        The other solution only works for two activities that are in the same application  In my case  application B doesn t know class com example MyExampleActivity class in the code  so compile will fail   I searched on the web and found something like this below  and it works well   Intent intent   new Intent    intent setComponent new ComponentName  com example    com example MyExampleActivity     startActivity intent     You can also use the setClassName method   Intent intent   new Intent Intent ACTION MAIN   intent setClassName  com hotfoot rapid adani wheeler android    com hotfoot rapid adani wheeler android view activities MainActivity    startActivity intent   finish      You can also pass the values from one app to another app    Intent launchIntent   getApplicationContext   getPackageManager   getLaunchIntentForPackage  com hotfoot rapid adani wheeler android LoginActivity    if  launchIntent    null        launchIntent putExtra  AppID    MY-CHILD-APP1        launchIntent putExtra  UserID    MY-APP        launchIntent putExtra  Password    MY-PASSWORD        startActivity launchIntent       finish      else       Toast makeText getApplicationContext      launch Intent not available   Toast LENGTH SHORT  show

[android] How to start activity in another application?

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