Launch a specific activity from an application [duplicate]

Question

This question already has answers here:

Open another application from your own (intent) (20 answers)

Closed 8 years ago.

Just a little problem:

For example I have the activity TestActivity in my Application com.example.testapp
but the activity doesn't have the flag android.intent.category.LAUNCHER

now my question is how can i check if a given activity subpackage.SomeActivity
exists in a Package com.test.somepackage

it would be the same as typing in a console:

adb shell am start -n com.test.somepackage/subpackage.SomeActivity

and if it exists, how can i launch it from another app?

××××× to clarify my question ×××××

i am searching for functions in android like
Intent startthis = new Intent (packagename, activityname);

and if its possible something like
ActivityInfo[] ai = fetchAllActivitysFromPackage(packagename);

is there any function in android that does likely the same?

Answer 1

You can get all activities for packages the following way:

List<PackageInfo> installedPackages = getPackageManager().getInstalledPackages(PackageManager.GET_ACTIVITIES);
Iterator packageIterator = installedPackages.iterator();
PackageInfo packageInfo = null;
while(packageIterator.hasNext()){
    packageInfo = (PackageInfo) packageIterator.next();
    if(packageInfo.activities != null){
        for(ActivityInfo activity : packageInfo.activities){
            Log.d("ACTIVITY", activity.name);
        }
    }
}

However, you can only start an external activity if that app has defined an intent-filter for it, and if you now the exact ACTION of the intent filter.

Update: To get all activities for one package name, use:

PackageInfo packageInfo = getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);