Question

是否可以在不使用XML的情况下为主题应用动画？过去，我使用的是 styles.xml ，但我希望它是动态进行的。

我只想通过编程方式设置
我只希望在更改主题时发生淡入淡出的动画
我想要预期结果
请注意预期结果和当前结果之间的动画差异。

预期结果

当前结果

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="android:Theme.Material.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

    <!-- dark mode Settings theme. -->
    <style name="MyDarkSettingsTheme" parent="Theme.AppCompat.NoActionBar">
        <item name="android:windowBackground">@null</item>
        <item name="android:windowAnimationStyle">@style/WindowAnimationTransition</item>
    </style>

    <!-- light mode Settings theme. -->
    <style name="MyLightSettingsTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="android:windowBackground">@null</item>
        <item name="android:windowAnimationStyle">@style/WindowAnimationTransition</item>
    </style>

    <style name="WindowAnimationTransition">
        <item name="android:windowEnterAnimation">@android:anim/fade_in</item>
        <item name="android:windowExitAnimation">@android:anim/fade_out</item>
    </style>

</resources>

活动

class SettingsActivity : AppCompatActivity(), SettingsFragment.PreferenceXchangeListener {
    private var mCurrentValue: Boolean = false

    override fun onCreate(savedInstanceState: Bundle?) {
        val mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)
        mCurrentValue = mSharedPreferences.getBoolean("preference_a", false)

        if (mCurrentValue) {
            setTheme(R.style.MyDarkSettingsTheme)

        } else {
            setTheme(R.style.MyLightSettingsTheme)
        }

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_settings)

        val viewllSettingsContainer = findViewById<LinearLayout>(R.id.settings_container)

        val root = viewllSettingsContainer.rootView

        // Set the background color upon Activity launch and Theme change
        if (mCurrentValue) {
            root.setBackgroundColor(Color.BLACK)
        } else {
            root.setBackgroundColor(Color.WHITE)
        }

        val mToolbar = findViewById<Toolbar>(R.id.toolbar_1line)
        setSupportActionBar(mToolbar)

        val mTitle = this.findViewById<TextView>(R.id.toolbar_1line_title)
        mTitle.text = "Preferences"
        mTitle.setTextColor(Color.WHITE)

        val settingsFragment = SettingsFragment()
        supportFragmentManager
                .beginTransaction()
                .replace(R.id.settings_container, settingsFragment)
                .commit()
    }


    // callback method for changing preference. It's only called if "preference_a" has changed
    override fun onXchange(value:Boolean) {
        // if value differs from previous Theme, recreate Activity
        when {
            mCurrentValue != value -> {
                mCurrentValue = value
                recreate()
            }
        }
    }
}

片段

anim / fade_in.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha android:fromAlpha="1.0" android:toAlpha="0.0"
        android:duration="@android:integer/config_mediumAnimTime" />
</set>

如何以编程方式将动画应用于主题更改

0 个答案: