Android 关于片段事务_Android_Performance_Android Fragments

Android 关于片段事务

android performance android-fragments

Android 关于片段事务,android,performance,android-fragments,Android,Performance,Android Fragments,我在一个活动中有三个片段，并在活动中处理了backpress。在backpress in one fragment（CallingFragment）中加载DialerFragment，因为我在加载CallingFragment并给出此日志时已将其添加到backstack中。请告诉我为什么会这样加载调用片段： void launchCallingFrag(String number, String name ,long time , boolean isongoing,String price

我在一个活动中有三个片段，并在活动中处理了backpress。在backpress in one fragment

（CallingFragment）

中加载

DialerFragment

，因为我在加载

CallingFragment

并给出此日志时已将其添加到backstack中。请告诉我为什么会这样

加载调用片段：

 void launchCallingFrag(String number, String name ,long time , boolean isongoing,String price )
    {
        String calleename= name;
        if(calleename==null)
        calleename=CommonUtility.getContactDisplayNameByNumber(number, context);

        callingScreenFragment.setNumber( number,calleename ,time,isongoing , price);
        ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.dial_fragment, callingScreenFragment, CALLING_FRAGMENT_TAG);

        dialerFragment = (DialerFragment)getSupportFragmentManager().findFragmentByTag(DIALER_FRAGMENT_TAG);

        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);

            ft.addToBackStack(DIALER_FRAGMENT_TAG);


        ft.commit();
        overridePendingTransition(R.anim.animation1, R.anim.animation2);

    }

  @Override
public void onBackPressed() {
Log.e("back press called ",""+getSupportFragmentManager().getBackStackEntryCount());
dialerFragment = (DialerFragment)getSupportFragmentManager().findFragmentByTag(DIALER_FRAGMENT_TAG);
if (dialerFragment!=null&&dialerFragment.isVisible()) {
// add your code here
Log.e("dialer fragment","dialer fragment ");
dialerFragment.onBackPress();
}
else {

callingScreenFragment = (CallingScreenFragment) getSupportFragmentManager().findFragmentByTag(CALLING_FRAGMENT_TAG);
if (callingScreenFragment!=null&&callingScreenFragment.isVisible()) {

Log.e("calling  fragment", "calling fragment ");

callingScreenFragment.onBackPress(fromNotification);

}
else {
recentDetailFragment = (RecentDetailFragment) getSupportFragmentManager().findFragmentByTag(LOG_DETAILS_FRAGMENT_TAG);
if (recentDetailFragment!=null&&recentDetailFragment.isVisible()) {
Log.e("recent   fragment","recent fragment ");
recentDetailFragment.onBackPress();
}
else {
super.onBackPressed();
}
}

}

 02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.addTargets
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.addTransitionTargets
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.beginDelayedTransition
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.captureExitingViews
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12194: Landroid/view/ViewGroup;.isTransitionGroup ()Z
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.cleanupTransitions
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.cloneTransition
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.excludeTarget
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12022: Landroid/view/View;.getTransitionName ()Ljava/lang/String;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12022: Landroid/view/View;.getTransitionName ()Ljava/lang/String;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.mergeTransitions
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.removeTargets
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.setEpicenter
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to find class referenced in signature (Landroid/transition/Transition;)
            02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$3; (1449)
            02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$3;' failed
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.support.v4.app.FragmentTransitionCompat21$3', referenced from method android.support.v4.app.FragmentTransitionCompat21.setSharedElementEpicenter
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve new-instance 422 (Landroid/support/v4/app/FragmentTransitionCompat21$3;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$1; (1449)
            02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$1;' failed
    02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$3; (1449)
            02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$3;' failed

反压：

 void launchCallingFrag(String number, String name ,long time , boolean isongoing,String price )
    {
        String calleename= name;
        if(calleename==null)
        calleename=CommonUtility.getContactDisplayNameByNumber(number, context);

        callingScreenFragment.setNumber( number,calleename ,time,isongoing , price);
        ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.dial_fragment, callingScreenFragment, CALLING_FRAGMENT_TAG);

        dialerFragment = (DialerFragment)getSupportFragmentManager().findFragmentByTag(DIALER_FRAGMENT_TAG);

        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);

            ft.addToBackStack(DIALER_FRAGMENT_TAG);


        ft.commit();
        overridePendingTransition(R.anim.animation1, R.anim.animation2);

    }

  @Override
public void onBackPressed() {
Log.e("back press called ",""+getSupportFragmentManager().getBackStackEntryCount());
dialerFragment = (DialerFragment)getSupportFragmentManager().findFragmentByTag(DIALER_FRAGMENT_TAG);
if (dialerFragment!=null&&dialerFragment.isVisible()) {
// add your code here
Log.e("dialer fragment","dialer fragment ");
dialerFragment.onBackPress();
}
else {

callingScreenFragment = (CallingScreenFragment) getSupportFragmentManager().findFragmentByTag(CALLING_FRAGMENT_TAG);
if (callingScreenFragment!=null&&callingScreenFragment.isVisible()) {

Log.e("calling  fragment", "calling fragment ");

callingScreenFragment.onBackPress(fromNotification);

}
else {
recentDetailFragment = (RecentDetailFragment) getSupportFragmentManager().findFragmentByTag(LOG_DETAILS_FRAGMENT_TAG);
if (recentDetailFragment!=null&&recentDetailFragment.isVisible()) {
Log.e("recent   fragment","recent fragment ");
recentDetailFragment.onBackPress();
}
else {
super.onBackPressed();
}
}

}

 02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.addTargets
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.addTransitionTargets
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.beginDelayedTransition
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.captureExitingViews
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12194: Landroid/view/ViewGroup;.isTransitionGroup ()Z
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.cleanupTransitions
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.cloneTransition
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.excludeTarget
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12022: Landroid/view/View;.getTransitionName ()Ljava/lang/String;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12022: Landroid/view/View;.getTransitionName ()Ljava/lang/String;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.mergeTransitions
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.removeTargets
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.setEpicenter
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to find class referenced in signature (Landroid/transition/Transition;)
            02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$3; (1449)
            02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$3;' failed
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.support.v4.app.FragmentTransitionCompat21$3', referenced from method android.support.v4.app.FragmentTransitionCompat21.setSharedElementEpicenter
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve new-instance 422 (Landroid/support/v4/app/FragmentTransitionCompat21$3;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$1; (1449)
            02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$1;' failed
    02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$3; (1449)
            02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$3;' failed

日志：

 void launchCallingFrag(String number, String name ,long time , boolean isongoing,String price )
    {
        String calleename= name;
        if(calleename==null)
        calleename=CommonUtility.getContactDisplayNameByNumber(number, context);

        callingScreenFragment.setNumber( number,calleename ,time,isongoing , price);
        ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.dial_fragment, callingScreenFragment, CALLING_FRAGMENT_TAG);

        dialerFragment = (DialerFragment)getSupportFragmentManager().findFragmentByTag(DIALER_FRAGMENT_TAG);

        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);

            ft.addToBackStack(DIALER_FRAGMENT_TAG);


        ft.commit();
        overridePendingTransition(R.anim.animation1, R.anim.animation2);

    }

  @Override
public void onBackPressed() {
Log.e("back press called ",""+getSupportFragmentManager().getBackStackEntryCount());
dialerFragment = (DialerFragment)getSupportFragmentManager().findFragmentByTag(DIALER_FRAGMENT_TAG);
if (dialerFragment!=null&&dialerFragment.isVisible()) {
// add your code here
Log.e("dialer fragment","dialer fragment ");
dialerFragment.onBackPress();
}
else {

callingScreenFragment = (CallingScreenFragment) getSupportFragmentManager().findFragmentByTag(CALLING_FRAGMENT_TAG);
if (callingScreenFragment!=null&&callingScreenFragment.isVisible()) {

Log.e("calling  fragment", "calling fragment ");

callingScreenFragment.onBackPress(fromNotification);

}
else {
recentDetailFragment = (RecentDetailFragment) getSupportFragmentManager().findFragmentByTag(LOG_DETAILS_FRAGMENT_TAG);
if (recentDetailFragment!=null&&recentDetailFragment.isVisible()) {
Log.e("recent   fragment","recent fragment ");
recentDetailFragment.onBackPress();
}
else {
super.onBackPressed();
}
}

}

 02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.addTargets
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.addTransitionTargets
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.beginDelayedTransition
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.captureExitingViews
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12194: Landroid/view/ViewGroup;.isTransitionGroup ()Z
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.cleanupTransitions
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.967  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.cloneTransition
    02-05 17:17:04.967  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.excludeTarget
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12022: Landroid/view/View;.getTransitionName ()Ljava/lang/String;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12022: Landroid/view/View;.getTransitionName ()Ljava/lang/String;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.mergeTransitions
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.removeTargets
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method android.support.v4.app.FragmentTransitionCompat21.setEpicenter
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve check-cast 1450 (Landroid/transition/Transition;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to find class referenced in signature (Landroid/transition/Transition;)
            02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$3; (1449)
            02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$3;' failed
    02-05 17:17:04.977  10280-10280/com.myapp E/dalvikvm﹕ Could not find class 'android.support.v4.app.FragmentTransitionCompat21$3', referenced from method android.support.v4.app.FragmentTransitionCompat21.setSharedElementEpicenter
    02-05 17:17:04.977  10280-10280/com.myapp W/dalvikvm﹕ VFY: unable to resolve new-instance 422 (Landroid/support/v4/app/FragmentTransitionCompat21$3;) in Landroid/support/v4/app/FragmentTransitionCompat21;
    02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$1; (1449)
            02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$1;' failed
    02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$3; (1449)
            02-05 17:17:04.987  10280-10280/com.myapp W/dalvikvm﹕ Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$3;' failed

不幸的是，这是由于

android.support.v4

库中的bug造成的，这些bug尚未解决（截至回答日期）

基本上，支持库使用API级别19和21 API，即使在没有足够高的API级别的设备上运行。这是一个非常严重（甚至令人震惊）的bug，因为Android支持库的全部目的是将应用程序和API级别的差异隔离开来

在您的情况下，您显然是在API级别低于19的设备上运行的，而这正是引入整个软件包的时候

与Android相关的问题有：和。您可能希望访问这些问题并启动它们，和/或添加新问题。

我在运行API级别19（Android 4.4.2）的设备上遇到此问题。您的日志显示，无法找到API级别19中引入的

Android.transition.Transaction

。这意味着运行时环境低于19级。如果您只是在代码中临时显式地使用

转换

类，是否会导致异常？