here is complete working example (works as outlined by author of accepted answer.)
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.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
private static final String TAG = "Main";
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){
Log.i(TAG, "fragment is null");
if (showingA){
f = a = new A();
} else {
f = b = new B();
}
fragmentWasNull = true;
} else {
Log.i(TAG, "fragment is not null");
showingA = (f instanceof A);
updateButtonText();
}
if (fragmentWasNull){
FragmentTransaction ft = fm.beginTransaction();
ft.add(layoutId, showingA ? a : b, "main").commit();
}
}
private void updateButtonText(){
button.setText(showingA ? "slide in B" : "slide in A");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
FragmentManager fm = getFragmentManager();
button = (Button)findViewById(R.id.button);
incarnate(fm);
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;
updateButtonText();
}
};
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)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="slide in B" />
<FrameLayout
android:id="@+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
a.xml (layout)
<?xml version="1.0" encoding="utf-8"?>
<com.example.slidetrans.LL xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#00FF00"
>
<TextView
android:id="@+id/aText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="AAAAAAAAAAAAAAAAAA"
android:textSize="30sp"
android:textStyle="bold"
/>
</com.example.slidetrans.LL>
b.xml (layout)
<?xml version="1.0" encoding="utf-8"?>
<com.example.slidetrans.LL xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#FFFF00"
>
<TextView
android:id="@+id/bText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textStyle="bold"
android:text="BBBBBBBBBB"
/>
</com.example.slidetrans.LL>
in.xml (anim)
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator
android:duration="500"
android:interpolator="@android:anim/linear_interpolator"
android:propertyName="xFraction"
android:valueFrom="1.0"
android:valueTo="0.0"
android:valueType="floatType" />
</set>
out.xml (anim)
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator
android:duration="500"
android:interpolator="@android:anim/linear_interpolator"
android:propertyName="xFraction"
android:valueFrom="0.0"
android:valueTo="-1.0"
android:valueType="floatType" />
</set>
AnimatorInflaterandAnimationUtils, and both are still supported (API level 22). You are still able to use the 'old' tween animations if you like, but they won't always work, true. One example is if you use native (i.e. not support) fragments - they require the new animators and then you need to write some code. There are solutions for this, like subclasses with 'fractionX/Y' properties, but I think it is better to use a ValueAnimator with a custom listener to update the positions - you don't need a subclass then. – Leonorleonora