Can't get objectAnimator working with xFraction

Question

I\'m trying to animate a slide-in/slide-out animation between Fragments. I know there\'re tons of similiar question out there on StackOverflow<

Answer 1

since above code listings are only partial, I thought I'd share with you a complete working example. It works as outlined in the question.

Pressing the button toggles between 2 fragments A and B (by slide animation right to left). The fragments are just stupid text (AAAAAA and BBBBB) with different backgrounds.

MainActivity.java

package com.example.slidetrans;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;


public class MainActivity extends Activity {

    boolean showingA = true;
    Button button;

    A a;
    B b;

    private void incarnate(FragmentManager fm){
        int layoutId = R.id.frame;
        boolean fragmentWasNull = false;
        Fragment f = fm.findFragmentById(layoutId);
        if (f == null){
            if (showingA){
                f = a = new A();
            } else {
                f = b = new B();
            }
            fragmentWasNull = true;
        }
        if (fragmentWasNull){
            FragmentTransaction ft = fm.beginTransaction();
            ft.add(layoutId, showingA ? a : b,  "main").commit(); 
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        FragmentManager fm = getFragmentManager();
        incarnate(fm);
        button = (Button)findViewById(R.id.button);
        OnClickListener listener = new OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentManager fm = getFragmentManager();
                FragmentTransaction transaction = fm.beginTransaction();
                transaction.setCustomAnimations(R.anim.in, R.anim.out);
                transaction.replace(R.id.frame, showingA ? new B() : new A()).commit();
                showingA = !showingA;
                button.setText(showingA ? "slide in B" : "slide in A");
            }
        };
        button.setOnClickListener(listener);
    }
}

LL.java

package com.example.slidetrans;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;

public class LL extends LinearLayout {

    public LL(Context context) {
        super(context);
    }

    public LL(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public float getXFraction() {
        final int width = getWidth();
        if (width != 0) return getX() / getWidth();
        else return getX();
    }

    public void setXFraction(float xFraction) {
        final int width = getWidth();
        float newWidth = (width > 0) ? (xFraction * width) : -9999;
        setX(newWidth);
    }
}

main.xml (layout)

a.xml (layout)

b.xml (layout)

in.xml (anim)

out.xml (anim)