android - Android Kotlin-淡出 Activity 并设置持续时间

Question

这是我到目前为止所拥有的:

class ChooseUpload : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_choose_upload)

        overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)
    }

    override fun onStop() {
        overridePendingTransition(0, android.R.anim.fade_out)
        super.onStop()
    }
}

如您所见，我已经尝试过2次来设置淡出动画，但是它不起作用，它仍然会左右滑动。虽然淡入淡出。
那么，如何既使它们工作又设置动画的持续时间呢？我希望它很快
在开始 Activity 之前，我也尝试过这样做:

        val bundle = ActivityOptionsCompat.makeCustomAnimation(
            this,
            android.R.anim.fade_in, android.R.anim.fade_out
        ).toBundle()
        startActivity(i, bundle)

Answer 1

为了触发ActivityOptionsCompat的退出动画，您必须在完成 Activity 时调用supportFinishAfterTransition()，而不是通常的finish()。以我的经验，除了覆盖待处理的动画之外，您还需要执行此操作。
确保在主题中设置了<item name="android:windowActivityTransitions">true</item>。
您可以直接在动画.xml文件中设置持续时间。这是我的stay.xml的示例:

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="@android:integer/config_mediumAnimTime"
    android:fromYDelta="0%"
    android:toYDelta="0%" />

为了方便起见，我将此逻辑放入BaseActivity中:

abstract class BaseActivity: AppCompatActivity() {
    private var transition: Transition? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        transition = intent.getParcelableExtra(TRANSITION_ANIMATION)
    }

    override fun finish() {
        transition?.let { animation ->
            transition = null //Prevent recursive loop
            supportFinishAfterTransition().also { overridePendingTransition(Transition.stay, animation.exitId) }
        } ?: run {
            super.finish()
        }
    }

    companion object {
        const val TRANSITION_ANIMATION = "TRANSITION_ANIMATION"
    }
}

fun Activity.startActivityWithAnimation(intent: Intent, transition: Transition) {
    intent.putExtra(BaseActivity.TRANSITION_ANIMATION, transition as Parcelable)
    startActivity(intent, ActivityOptionsCompat.makeCustomAnimation(this, transition.enterId, Transition.stay).toBundle())
}

@Parcelize
enum class Transition constructor(val enterId: Int, val exitId: Int) : Parcelable {
    FADE(android.R.anim.fade_in, android.R.anim.fade_out);

    companion object  {
        val stay: Int
            get() = R.anim.stay
    }
}