问题
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, but believe me - I tried all of them and none is working.
Following my code (basically taken from similiar questions):
Custom Layout
public class SlidingFrameLayout extends FrameLayout {
public SlidingFrameLayout(Context context) {
super(context);
}
public SlidingFrameLayout(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();
setX((width > 0) ? (xFraction * width) : -9999);
}
}
Fragment Transaction
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.setCustomAnimations(R.animator.card_enter_right, R.animator.card_out_left);
ft.replace(R.id.quiz_container, CardFragment.newInstance());
ft.commit();
Object animator
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="1000"
android:interpolator="@android:anim/linear_interpolator"
android:propertyName="xFraction"
android:valueFrom="1.0"
android:valueTo="0.0"
android:valueType="floatType" />
Layout file
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.my.package.views.SlidingFrameLayout
android:id="@+id/quiz_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- Other views -->
</FrameLayout>
So when I'm running this code nothing happens. The Fragments get replaced but without an animation.
What am doing wrong?
Note: If I'm running the animation with "x" instead of "xFraction" and changing the values to let's say from:1280 to:0 it's working. Unfortunately this isn't a solution for me, since I need a "percentage value" because of the broad range of display resolutions.
Solution
Thanks to pskink who led me to the solution. I always thought that the container of my Fragment needs to implement the getXFraction()/setXFraction() method. But that's not true. You're Fragments layout needs to implement getXFraction()/setXFraction.
So basically I changed my Fragment-Layout from something like this:
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:prefix="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="40dp"
prefix:cardCornerRadius="4dp">
<!-- Content -->
</android.support.v7.widget.CardView>
to:
<com.my.package.views.SlidingFrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:prefix="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="40dp"
prefix:cardCornerRadius="4dp">
<!-- Content -->
</android.support.v7.widget.CardView>
</com.my.package.views.SlidingFrameLayout>
回答1:
setXFraction and getXFraction should be defined in the root view: the view you return from onCreateView, in your case custom CardView
回答2:
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)
<?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>
回答3:
The example provided by @mathheadinclouds worked for me using "R.animator.in" instead of R.anim.in in the line:
transaction.setCustomAnimations(R.anim.in, R.anim.out);
来源：https://stackoverflow.com/questions/25699178/cant-get-objectanimator-working-with-xfraction