如何用XML文件设置Explode转场？setEnterTransition失效求助

Hey there! Let's figure out why your Explode transition isn't kicking in and get it working properly. Here are the most common issues and fixes to check:

1. Verify XML File Placement #

First off, make sure your transition XML files are stored in the res/transition/ directory (not res/anim/ or res/animator/). Android looks specifically in transition/ for transition resources, so putting them anywhere else will cause the system to not find them.

2. Fix Your XML Configurations #

Let's break down your two approaches:

• First approach (transitionManager): This XML structure is meant for managing transitions between scenes within the same Activity (like swapping layouts), not for Activity enter/exit transitions. So this won't work for setting setEnterTransition directly.
• Second approach (transitionSet): This is valid, but you can simplify it even more if you're only using the Explode transition:

  <?xml version="1.0" encoding="utf-8"?>
  <explode xmlns:android="http://schemas.android.com/apk/res/android"
      android:duration="500"
      android:interpolator="@android:interpolator/bounce" />
  

  No need for a transitionSet wrapper unless you're combining multiple transitions (like Explode + Fade).

3. Check How You're Applying the Transition in Code #

There are two reliable ways to set the enter transition for an Activity:

Option A: Set it programmatically #

Make sure you inflate and apply the transition before setting the content view:

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    // Inflate the transition and apply it to the window
    window.enterTransition = TransitionInflater.from(this).inflateTransition(R.transition.explode)
    setContentView(R.layout.activity_your_target)
}

For Java:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setEnterTransition(TransitionInflater.from(this).inflateTransition(R.transition.explode));
    setContentView(R.layout.activity_your_target);
}

Option B: Set it via your Activity's theme #

Add this line to your app theme in res/values/styles.xml (and res/values-v21/styles.xml if you're supporting older versions):

<style name="AppTheme.YourActivityTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar">
    <item name="android:windowEnterTransition">@transition/explode</item>
</style>

Then make sure your Activity uses this theme in the manifest:

<activity
    android:name=".YourTargetActivity"
    android:theme="@style/AppTheme.YourActivityTheme" />

4. Ensure You're Triggering the Transition Correctly #

Activity transitions only work if you start the Activity with scene transition animations enabled. Instead of a plain startActivity(intent), use:

startActivity(intent, ActivityOptions.makeSceneTransitionAnimation(this).toBundle())

Java:

startActivity(intent, ActivityOptions.makeSceneTransitionAnimation(this).toBundle());

If you skip this step, the system won't trigger the enter/exit transitions.

5. Rule Out Animation Blockers #

• Check if your theme or code is disabling window animations. Look for lines like android:windowAnimationStyle="@null" in your theme or window.setWindowAnimations(0) in code—these will override your transition settings.
• Ensure your minSdkVersion is 21 or higher (Explode transitions were added in Android 5.0). If you need to support older versions, you'll need to use AndroidX Transition library and add fallback logic.

6. Test Properly #

• Avoid using Instant Run for testing transitions—it can sometimes break animation logic. Build a full APK and install it directly.
• Test on a physical device or emulator running Android 5.0 (API 21) or newer.

Give these steps a try, and your Explode transition should start working as expected!

内容的提问来源于stack exchange，提问作者MJakhongir