Update launcher activity attribute to Android 12

[reneargento]

To be able to target Android 12 all activities that use intent filters must declare the android:exported attribute.
Reference:

 https://developer.android.com/about/versions/12/behavior-changes-12#exported

This pull request adds the attribute on LeakLauncherActivity.
Without it, apps that have a dependency on LeakCanary will not be able to target Android 12.

I got the following error when trying to build an app that depends on LeakCanary targeting Android 12:

Failed to commit install session 473003211 with command cmd package install-commit 473003211. Error: INSTALL_PARSE_FAILED_MANIFEST_MALFORMED: Failed parse during installPackageLI: /data/app/vmdl473003211.tmp/base.apk (at Binary XML file line 752): leakcanary.internal.activity.LeakLauncherActivity: Targeting S+ (version 10000 and above) requires that an explicit value for android:exported be defined when intent filters are present

[CLAassistant]

All committers have signed the CLA.

[imknown]

This can be resolved by the app side temporarily:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" ...>
    <application ...>
        <activity-alias
            android:name="leakcanary.internal.activity.LeakLauncherActivity"
            android:exported="true"
            android:targetActivity="leakcanary.internal.activity.LeakActivity"
            tools:node="merge" />
    </application>
</manifest>

However, it will still crash because o thef Android-12-targeting PendingInent API:

E/AndroidRuntime: FATAL EXCEPTION: IntentService[HeapAnalyzerService]
    Process: net.imknown.android.forefrontinfo.debug:leakcanary, PID: 6854
    java.lang.IllegalArgumentException: net.imknown.android.forefrontinfo.debug: Targeting S+ (version 10000 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
    Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
        at android.app.PendingIntent.checkFlags(PendingIntent.java:367)
        at android.app.PendingIntent.getActivityAsUser(PendingIntent.java:452)
        at android.app.PendingIntent.getActivity(PendingIntent.java:437)
        at android.app.PendingIntent.getActivity(PendingIntent.java:401)
        at leakcanary.internal.activity.LeakActivity$Companion.createPendingIntent(LeakActivity.kt:181)
        at leakcanary.DefaultOnHeapAnalyzedListener.showNotification(DefaultOnHeapAnalyzedListener.kt:74)
        at leakcanary.DefaultOnHeapAnalyzedListener.onHeapAnalyzed(DefaultOnHeapAnalyzedListener.kt:66)
        at leakcanary.internal.HeapAnalyzerService.onHandleIntentInForeground(HeapAnalyzerService.kt:73)
        at leakcanary.internal.ForegroundService.onHandleIntent(ForegroundService.kt:55)
        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:78)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:201)
        at android.os.Looper.loop(Looper.java:288)
        at android.os.HandlerThread.run(HandlerThread.java:67)

leakcanary/leakcanary-android-core/src/main/java/leakcanary/internal/activity/LeakActivity.kt

Lines 174 to 182 in 438aa49

	fun createPendingIntent(
	context: Context,
	screens: ArrayList<Screen>
	): PendingIntent {
	val intent = Intent(context, LeakActivity::class.java)
	intent.putExtra("screens", screens)
	intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
	return PendingIntent.getActivity(context, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT)
	}

So, it may be:

intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP or PendingIntent.FLAG_IMMUTABLE

[pyricau]

I'm going to merge this. @imknown you are saying there's still going to be a crash even after exported is merged in, right?

[imknown]

@pyricau Yes. Crash will happen after dumping.