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Fix possible NPE during refresh rate switch (#448)

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Use current thread's looper or fallback to the main looper for the
display change callback.

This is the behavior in newer versions of Android whereas older versions
assumed a non-null looper.

Fixes #446
This commit is contained in:
damontecres 2025-12-13 17:58:30 -05:00 • committed by GitHub
parent d2e1c4683d
commit a386028b6b
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1 changed files with 13 additions and 4 deletions
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15
app/src/main/java/com/github/damontecres/wholphin/services/RefreshRateService.kt
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@ -3,9 +3,12 @@ package com.github.damontecres.wholphin.services
import android.content.Context
import android.hardware.display.DisplayManager
import android.os.Build
import android.os.Handler
import android.os.Looper
import android.view.Display
import androidx.lifecycle.LiveData
import com.github.damontecres.wholphin.ui.setValueOnMain
import com.github.damontecres.wholphin.ui.showToast
import com.github.damontecres.wholphin.util.EqualityMutableLiveData
import dagger.hilt.android.qualifiers.ApplicationContext
import kotlinx.coroutines.delay
@ -57,12 +60,18 @@ class RefreshRateService
Timber.i("Found display mode: %s, current=${display.mode}", targetMode)
if (targetMode != null && targetMode != display.mode) {
val listener = Listener(display.displayId)
displayManager.registerDisplayListener(listener, null)
displayManager.registerDisplayListener(
listener,
Handler(Looper.myLooper() ?: Looper.getMainLooper()),
)
_refreshRateMode.setValueOnMain(targetMode)
try {
listener.latch.await(5, TimeUnit.SECONDS)
} catch (_: InterruptedException) {
if (!listener.latch.await(5, TimeUnit.SECONDS)) {
Timber.w("Timed out waiting for display change")
showToast(context, "Refresh rate switch is taking a long time")
}
} catch (ex: InterruptedException) {
Timber.w(ex, "Exception waiting for refresh rate switch")
}
val targetRate = (targetMode.refreshRate * 100).roundToInt()
val isSeamless =