Android - How to get Activity path

Question

How can i get the path the end user takes to arrive at any activity.

so if user visited Activities A, B , C .. then in Activity c i would be able to get a info like this "A/B/C". And likewise if user took the path directly to D, F then in activity F i would have the path info of "D/F".

Answer 1

Whenever you start an Activity you could pass it a string extra that states the path you're talking about. A quick example could be to have this method in an abstract base activity class and use it whenever starting a new Activity:

public <T extends Activity> void startActivityWithPathInfo(Class<T> activityClass) {
    String path = getIntent().getStringExtra("path");
    path = path == null ? "" : path += "/";
    path += this.getClass().getSimpleName();
    Intent i = new Intent(this, activityClass);
    i.putExtra("path", path);
    startActivity(i);
}

Then in each activity you could just get the current path by using:

String path = getIntent().getStringExtra("path");

Edit: Given your requirements, it's probably better to split this up into a "getPath()" method and a "startActivityWithPathInfo(Class)" method. Might be easier for you to retrieve the path in each Activity :)

Edit 2: As per comments, here is the updated code:

public abstract BaseActivity extends Activity {
    private static final String EXTRA_PATH = "path";

    private String path;

    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState == null) {
            path = getPath();
        } else {
            path = savedInstanceState.getString(EXTRA_PATH, "");
        }
    }

    @Override protected void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putString(EXTRA_PATH, path);
    }

    public String getPath() {
        if (path == null) {
            path = getIntent().getStringExtra(EXTRA_PATH);
            path = path == null ? "" : path += "/";
            path += this.getClass().getSimpleName();
        }
        return path;
    }

    public <T extends Activity> void startActivityWithPathInfo(Class<T> activityClass) {
        Intent i = new Intent(this, activityClass);
        i.putExtra(EXTRA_PATH, getPath());
        startActivity(i);
    }
}