我正在研究android中的自动播放片段幻灯片动画。动画效果很好。我有5个滑动的碎片。我想在第二个片段完成滑动后隐藏第一个片段。我写了下面的代码，但第一个片段没有隐藏。如果我需要改变的话，请指导我。
我的第二个请求是我想要Decelerate_Accelerate_Interpolator。我见过几个像https://gist.github.com/NashLegend/5f51e5dc537f470f4384这样的java实现。但我想在xml文件中添加插值器引用。我不认为我可以以编程方式操纵我的ObjectAnimator。当我在Fragment中为setCustomAnimations方法传递此slide_in时。
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator
android:valueFrom="1"
android:valueTo="0"
android:valueType="floatType"
android:propertyName="XFraction"
android:duration="1600"
/>
</set>
public class TestUIActivity extends FragmentActivity {
private final String TAG ="TestUIActivity";
Fragment fragment = new ClinicloudGreyFragment();
int currentPage = 0, TIME_DELAY=1600, REPEAT =500;
boolean stop = false;
Timer swipeTimer = null;
private final Handler mHandler = new Handler();
//MyPagerAdapter mAdapter = new MyPagerAdapter(getSupportFragmentManager());
//ViewPager mPager = null;
Runnable update = new Runnable() {
@Override
public void run() {
if(currentPage == getCount()) {
stop = true;
currentPage = getCount()-1;
if(mHandler != null) {
mHandler.removeCallbacks(update);
}
}
if(!stop) {
if(currentPage == 1) {
TIME_DELAY=1600;
REPEAT=500;
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.setCustomAnimations(R.anim.slideinwithhalfasecdelay, R.anim.slideout);
//ft.hide(fragment);
//fragment = new ClinicloudPurpleFragment();
ft.replace(R.id.topPanel, new ClinicloudPurpleFragment());
ft.commit();
} else if (currentPage == 2) {
TIME_DELAY=1600;
REPEAT=500;
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.hide(fragment);
//fragment = new ClinicloudOrangeFragment();
ft.setCustomAnimations(R.anim.slideinwithasecdelay,R.anim.slideout);
ft.replace(R.id.topPanel, new ClinicloudOrangeFragment());
ft.commit();
} else if (currentPage == 3) {
TIME_DELAY=1400;
REPEAT=400;
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.hide(fragment);
ft.setCustomAnimations(R.anim.slideinwithoneandhalfasecdelay, R.anim.slideout);
ft.replace(R.id.topPanel, new ClinicloudYellowFragment());
ft.commit();
} else if (currentPage == 4) {
TIME_DELAY = 1200;
REPEAT=400;
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.hide(fragment);
ft.setCustomAnimations(R.anim.slideinwithtwosecdelay,R.anim.slideout);
ft.replace(R.id.topPanel, new ClinicloudBlueFragment());
ft.commit();
}
currentPage++;
}
}
};
public int getCount() {
return 5;
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="@+id/topPanel"
android:name="com.clinicloud.app.ClinicloudGreyFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="76.4">
</fragment>
<fragment
android:id="@+id/bottomPanel"
android:name="com.clinicloud.app.ClinicloudBottonFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="23.6">
</fragment>
</LinearLayout>
评论之后，我修改了我的Activity类，如下所示。
public class TestUIActivity extends FragmentActivity {
private final String TAG ="TestUIActivity";
Fragment fragment = new ClinicloudGreyFragment();
int currentPage = 0, TIME_DELAY=1600, REPEAT =500;
boolean stop = false;
Timer swipeTimer = null;
private final Handler mHandler = new Handler();
//MyPagerAdapter mAdapter = new MyPagerAdapter(getSupportFragmentManager());
//ViewPager mPager = null;
Runnable update = new Runnable() {
@Override
public void run() {
if(currentPage == getCount()) {
stop = true;
currentPage = getCount()-1;
if(mHandler != null) {
mHandler.removeCallbacks(update);
}
}
if(!stop) {
if(currentPage == 1) {
TIME_DELAY=1600;
REPEAT=500;
FragmentTransaction ftTop = getFragmentManager().beginTransaction();
ftTop.setCustomAnimations(R.anim.slideinwithhalfasecdelay, R.anim.slideout);
//ft.hide(fragment);
//fragment = new ClinicloudPurpleFragment();
ClinicloudPurpleFragment clinicloudPurpleFragment = ClinicloudPurpleFragment.newInstance();
ftTop.replace(R.id.topPanel, clinicloudPurpleFragment, "Purple Fragment");
ftTop.commit();
} else if (currentPage == 2) {
TIME_DELAY=1600;
REPEAT=500;
FragmentTransaction ftTop = getFragmentManager().beginTransaction();
ftTop.setCustomAnimations(R.anim.slideinwithasecdelay, R.anim.slideout);
// FragmentTransaction ft = getFragmentManager().beginTransaction();
ftTop.hide(getFragmentManager().findFragmentByTag("GreyFragment"));
//fragment = new ClinicloudOrangeFragment();
ClinicloudOrangeFragment clinicloudOrangeFragment = ClinicloudOrangeFragment.newInstance();
ftTop.replace(R.id.topPanel, clinicloudOrangeFragment, "Orange Fragment");
ftTop.commit();
} else if (currentPage == 3) {
TIME_DELAY=1400;
REPEAT=400;
FragmentTransaction ftTop = getFragmentManager().beginTransaction();
ftTop.setCustomAnimations(R.anim.slideinwithoneandhalfasecdelay, R.anim.slideout);
ftTop.hide(getFragmentManager().findFragmentByTag("GreyFragment"));
ClinicloudYellowFragment clinicloudYellowFragment = ClinicloudYellowFragment.newInstance();
ftTop.replace(R.id.topPanel, clinicloudYellowFragment, "Yellow Fragment");
ftTop.commit();
} else if (currentPage == 4) {
TIME_DELAY = 1200;
REPEAT=400;
FragmentTransaction ftTop = getFragmentManager().beginTransaction();
ftTop.setCustomAnimations(R.anim.slideinwithtwosecdelay, R.anim.slideout);
ftTop.hide(getFragmentManager().findFragmentByTag("GreyFragment"));
ClinicloudBlueFragment clinicloudBlueFragment = ClinicloudBlueFragment.newInstance();
ftTop.replace(R.id.topPanel, clinicloudBlueFragment,"Blue Fragment");
ftTop.commit();
}
currentPage++;
}
}
};
public int getCount() {
return 5;
}
我得到了nullpointer异常
Process: com.clinicloud.app, PID: 25721
java.lang.NullPointerException
at android.app.BackStackRecord.run(BackStackRecord.java:658)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
尝试使用以下代码：
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
DetailsFragment newFragmentobject = DetailsFragment.newInstance();
ft.replace(R.id.fragment_container, newFragmentobject, "Fragment");
// Start the animated transition.
ft.commit();