How to get the file *.apk location in Android device

List<ApplicationInfo> PackageManager.getInstalledApplications() will give you a list of the installed applications, and ApplicationInfo.sourceDir is the path to the .apk file.

PackageManager pm = getPackageManager();

for (ApplicationInfo app : pm.getInstalledApplications(0)) {
  Log.d("PackageList", "package: " + app.packageName + ", sourceDir: " + app.sourceDir);
}

Outputs something like this:

package: com.tmobile.themechooser, sourceDir: /system/app/ThemeChooser.apk
package: com.tmobile.thememanager, sourceDir: /system/app/ThemeManager.apk
package: com.touchtype.swiftkey, sourceDir: /data/app/com.touchtype.swiftkey-1.apk
package: com.twitter.android, sourceDir: /data/app/com.twitter.android-2.apk
package: fm.last.android, sourceDir: /data/app/fm.last.android-1.apk

$ adb shell pm list packages -f

This gave me path in form /data/app/xxx.apk:

https://developer.android.com/reference/android/content/Context.html#getPackageResourcePath%28%29

You can also do adb bugreport and look at the output. You'll want to look for <package name="com.app.package" codePath="path/to/the/app.apk"...