What am i doing wrong when I try to call an activity outside an other activity in Android Java?-CodePudding

I Want to put all my methods in seperate classes to clean my code up when creating my Android App but i can seem to get it right.

In my MainActivity class i call the method from the importet class noteFunctionality onLongpress and OnDoubleTap.

            @Override
            public void onLongPress(@NonNull MotionEvent e) {
                noteFunc.enterNote("2");
                super.onLongPress(e);
            }

            @Override
            public boolean onDoubleTap(@NonNull MotionEvent e) {
                noteFunc.enterNote(2);
                return super.onDoubleTap(e);
            }

Then in my NoteFunctionality class i try start the a new activity class with the given int for the specifik activity, "I have more then one activity".

    public void enterNote(int i) {
    Class mainActivity = Class.forName("MainActivity"   i);
    Intent secondActivityIntent = new Intent(this, mainActivity.class);
    startActivity(secondActivityIntent);
}

What am I doing wrong?.

CodePudding user response：

public void enterNote(Activity activity,Context context) {
    //Class mainActivity = Class.forName("MainActivity"   i);   
    Intent secondActivityIntent = new Intent(context, activity.getClass());
    startActivity(secondActivityIntent);
}

and when you call it

noteFunc.enterNote(MainActivity,yourActivity.this);

CodePudding user response：

If you would like to trigger another Activity, it must be done through Context.

Therefore, you need to pass Context to your NoteFunctionality function to achieve your task.

MainActivity:

public class MainActivity extends Activity { // or extending any other form of Activity
    NoteFunctionality noteFunc; // I assume you have properly assign it somewhere

    @Override
    public void onLongPress(@NonNull MotionEvent e) {
        // You will have to pass also Context to enterNote function
        noteFunc.enterNote(MainActivity.this, "2"); // You should pass an Integer instead of String here
        super.onLongPress(e);
    }

    @Override
    public boolean onDoubleTap(@NonNull MotionEvent e) {
        noteFunc.enterNote(MainActivity.this, 2);
        return super.onDoubleTap(e);
    }
}

NoteFunctionality:

public class NoteFunctionality {
    // You need to have Context here
    public void enterNote(Context context, int i) {
        Intent secondActivityIntent = new Intent(context, SecondActivity.class); // Replace your target Activity name with SecondActivity
        context.startActivity(secondActivityIntent);
    }
}