Desistalei o App no meu Celular e agora ele não abre nem instala novamente!

Olá Guilherme,

Posta aqui a stack trace da exception para tentarmos descobrir o que está acontecendo.

08-30 16:56:25.872 20578-25299/? E/DropboxRealtime: null InputStream
                                                    java.io.IOException: null InputStream
                                                        at xjr.a(:com.google.android.gms:187)
                                                        at xjr.b(:com.google.android.gms:131)
                                                        at xiw.a(:com.google.android.gms:88)
                                                        at com.google.android.gms.stats.service.DropBoxEntryAddedChimeraService.onHandleIntent(:com.google.android.gms:1180)
                                                        at bhe.handleMessage(:com.google.android.gms:65)
                                                        at android.os.Handler.dispatchMessage(Handler.java:102)
                                                        at android.os.Looper.loop(Looper.java:148)
                                                        at android.os.HandlerThread.run(HandlerThread.java:61)
08-30 16:56:25.876 1795-2822/? W/DropBoxManagerService: Dropping: platform_stats_bookmark (13 > 0 bytes)
08-30 16:56:26.127 1795-1886/? W/ActivityManager: Activity pause timeout for ActivityRecord{226283c u0 com.example.gsav.agenda/.ListaAlunosActivity t490 f}
08-30 16:56:26.128 1795-1886/? I/ActivityManager: moveHomeStack, setupComplete:true
08-30 16:56:26.251 11427-24235/? V/ConnectivityManager: isActiveNetworkMetered() returns:false
08-30 16:56:26.419 1795-3035/? I/ActivityManager: Killing 24938:com.motorola.android.provisioning/u0a38 (adj 15): empty #7
08-30 16:56:26.532 11427-11527/? W/LocationOracle: getBestLocation(): no location is available
08-30 16:56:26.659 25087-25096/? I/art: Background sticky concurrent mark sweep GC freed 41741(2MB) AllocSpace objects, 24(872KB) LOS objects, 14% free, 19MB/22MB, paused 1.613ms total 105.979ms
08-30 16:56:26.694 360-1087/? I/SFPerfTracer:      triggers: (rate: 0:30) (41523 sw vsyncs) (0 skipped) (59:167386 vsyncs) (61:232929)
08-30 16:56:26.697 360-360/? I/SFPerfTracer:       trigger: render     (32.936 ms)    (7.936 ms off for 8 triggers)    (8 triggers)    (9 renders)
08-30 16:56:26.897 25087-25122/? W/OpenGLRenderer: Incorrectly called buildLayer on View: ShortcutAndWidgetContainer, destroying layer...
08-30 16:56:26.897 25087-25122/? W/OpenGLRenderer: Incorrectly called buildLayer on View: ShortcutAndWidgetContainer, destroying layer...
08-30 16:56:27.094 25087-25096/? I/art: Background sticky concurrent mark sweep GC freed 7089(744KB) AllocSpace objects, 93(1860KB) LOS objects, 11% free, 20MB/22MB, paused 29.878ms total 97.478ms
08-30 16:56:27.144 2369-2369/? D/TaskResourceLoader: getTaskDescriptionIcon begin: iconBitmap = null ,iconFilename = null
08-30 16:56:27.144 2369-2369/? D/TaskResourceLoader: getTaskDescriptionIcon end
08-30 16:56:27.145 2369-2369/? D/SystemServicesProxy: getThumbnail begin: taskId = 490
08-30 16:56:27.148 2369-2369/? D/SystemServicesProxy: getThumbnail end: taskId = 490
08-30 16:56:28.926 360-360/? I/SFPerfTracer:      triggers: (rate: 155:10538) (compose: 0:10) (post: 0:11) (render: 11:455) (16:136137 frames) (17:147280)
08-30 16:56:28.926 360-360/? D/SFPerfTracer:        layers: (6:11) (FocusedStackFrame (0xb8605c08): 0:676)* (DimLayer (0xb8606ed0): 0:122) (DimLayer (0xb8609930): 0:2)* (StatusBar (0xb8648018): 0:33033) (com.android.systemui.ImageWallpaper (0xb8678b68): 0:1340) (NavigationBar (0xb86660f0): 0:35) (DimLayer (0xb86676f0): 0:22)* (DimLayer (0xb86975e0): 0:2)* (Starting com.example.gsav.agenda (0xb86a7668): 0:33)- (Application Error: com.example.gsav.agenda (0xb86a5d28): 17:36) (com.google.android.googlequicksearchbox/com.google.android.launcher.GEL (0xb8679e48): 0:10) 
08-30 16:56:30.400 25165-25212/? E/linker: readlink('/proc/self/fd/22') failed: Permission denied [fd=22]
08-30 16:56:30.400 25165-25212/? E/linker: warning: unable to get realpath for the library "/data/app/com.instagram.android-1/lib/arm/libcronet.so". Will use given name.
08-30 16:56:30.481 1795-3120/? D/ConnectivityService: listenForNetwork for Listen from uid/pid:10006/25165 for NetworkRequest [ id=164, legacyType=-1, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN] ]
08-30 16:56:30.485 1795-2339/? D/ConnectivityService: rematching NetworkAgentInfo [WIFI () - 112]
08-30 16:56:30.494 25165-25454/? D/ConnectivityManager.CallbackHandler: CM callback handler got msg 524290
08-30 16:56:30.540 380-25464/? D/libc: dns server used:192.168.1.1
08-30 16:56:30.550 380-25464/? D/libc: dns server used:192.168.1.1
08-30 16:56:33.152 2369-2653/? I/NetworkController.MotorolaMobileSignalController(3): MotorolaMobilePhoneStateListener.onSignalStrengthsChanged: Entered: signalStrength=SignalStrength: 11 0 -120 -160 -120 -1 -1 99 2147483647 2147483647 2147483647 2147483647 2147483647 gsm|lte level=3
08-30 16:56:35.604 397-593/? I/ThermalEngine: Sensor:batt_therm:26700 mC
08-30 16:56:35.611 397-594/? I/ThermalEngine: Sensor:xo_therm_pu2:31000 mC
08-30 16:56:36.541 1795-1886/? W/ActivityManager: Activity destroy timeout for ActivityRecord{226283c u0 com.example.gsav.agenda/.ListaAlunosActivity t490 f}
08-30 16:56:40.209 2369-2653/? I/NetworkController.MotorolaMobileSignalController(3): MotorolaMobilePhoneStateListener.onSignalStrengthsChanged: Entered: signalStrength=SignalStrength: 13 0 -120 -160 -120 -1 -1 99 2147483647 2147483647 2147483647 2147483647 2147483647 gsm|lte level=4
08-30 16:56:45.608 397-593/? I/ThermalEngine: Sensor:batt_therm:26800 mC
08-30 16:56:45.615 397-594/? I/ThermalEngine: Sensor:xo_therm_pu2:31000 mC
08-30 16:56:46.018 1795-13989/? D/NetlinkSocketObserver: NeighborEvent{elapsedMs=122265585, 192.168.1.1, [FC528D5B7958], RTM_NEWNEIGH, NUD_STALE}
08-30 16:56:51.982 2369-2653/? I/NetworkController.MotorolaMobileSignalController(3): MotorolaMobilePhoneStateListener.onSignalStrengthsChanged: Entered: signalStrength=SignalStrength: 11 0 -120 -160 -120 -1 -1 99 2147483647 2147483647 2147483647 2147483647 2147483647 gsm|lte level=3
08-30 16:56:55.613 397-593/? I/ThermalEngine: Sensor:batt_therm:26900 mC
08-30 16:56:55.620 397-594/? I/ThermalEngine: Sensor:xo_therm_pu2:31000 mC
08-30 16:57:00.000 1795-2301/? V/AlarmManager: sending alarm {5d23396 type 3 *alarm*:android.intent.action.TIME_TICK}
08-30 16:57:00.055 1795-1795/? V/AlarmManager: done {5d23396, *alarm*:android.intent.action.TIME_TICK} [54ms]
08-30 16:57:03.961 1795-2296/? D/BatteryService: uevent={POWER_SUPPLY_TEMP=270, POWER_SUPPLY_STATUS=Full, POWER_SUPPLY_CAPACITY=100, ACTION=change, DEVPATH=/devices/qpnp-charger-e4a25800/power_supply/battery, POWER_SUPPLY_VOLTAGE_OCV=-22, POWER_SUPPLY_ONLINE=1, SUBSYSTEM=power_supply, POWER_SUPPLY_NUM_SYSTEM_TEMP_LEVELS=4, POWER_SUPPLY_INPUT_CURRENT_MAX=500000, POWER_SUPPLY_VOLTAGE_MAX_DESIGN=4350000, POWER_SUPPLY_CHARGE_FULL=2019000, POWER_SUPPLY_NAME=battery, POWER_SUPPLY_VOLTAGE_MIN_DESIGN=4300000, POWER_SUPPLY_VOLTAGE_MIN=4300000, POWER_SUPPLY_HEALTH=Good, POWER_SUPPLY_CYCLE_COUNT=1, POWER_SUPPLY_TECHNOLOGY=Li-ion, POWER_SUPPLY_CHARGE_TYPE=Fast, POWER_SUPPLY_PRESENT=1, POWER_SUPPLY_INPUT_CURRENT_SETTLED=0, POWER_SUPPLY_MODEL_NAME=UNKNOWN, POWER_SUPPLY_VOLTAGE_NOW=4305227, SEQNUM=38287, POWER_SUPPLY_TEMP_WARM=450, POWER_SUPPLY_TEMP_COOL=0, POWER_SUPPLY_CHARGE_FULL_DESIGN=2022000, POWER_SUPPLY_CURRENT_NOW=-55549, POWER_SUPPLY_CHARGE_COUNTER=-59339, POWER_SUPPLY_SYSTEM_TEMP_LEVEL=0, POWER_SUPPLY_INPUT_CURRENT_TRIM=38, POWER_SUPPLY_VOLTAGE_EMPTY=3200000, POWER_SUPPLY_CHARGE_RATE=Normal, POWER_SUPPLY_INPUT_VOLTAGE_REGULATION=0, POWER_SUPPLY_CHARGING_ENABLED=1}
08-30 16:57:04.035 25034-25034/? I/DownloadManagerWrapper: onReceive() : Charging = true
08-30 16:57:04.095 25034-25034/? I/DownloadManagerWrapper: onReceive() : Charging = true
08-30 16:57:04.173 1795-2301/? V/AlarmManager: sending alarm {1a079eb type 0 *walarm*:com.google.android.apps.photos.scheduler.ACTION_ALARM}
08-30 16:57:04.175 1795-2301/? V/AlarmManager: sending alarm {6600843 type 2 *walarm*:com.whatsapp.messaging.r.CLIENT_PINGER_ACTION}
08-30 16:57:04.184 1795-1886/? I/LaunchCheckinHandler: cleanup(): cleared. Last call was 37805 ms ago
08-30 16:57:04.185 1795-1886/? I/ActivityManager: Start proc 26008:com.google.android.apps.photos/u0a131 for broadcast com.google.android.apps.photos/.scheduler.AlarmReceiver
08-30 16:57:04.185 1795-2301/? V/AlarmManager: sending alarm {614903 type 2 *walarm*:com.google.android.gms.gcm.ACTION_CHECK_QUEUE}
08-30 16:57:04.185 1795-2301/? V/AlarmManager: sending alarm {70a69de type 3 *alarm*:com.google.android.gms/.lockbox.LockboxAlarmReceiver}
08-30 16:57:05.172 1795-1795/? V/AlarmManager: done {1a079eb, *walarm*:com.google.android.apps.photos.scheduler.ACTION_ALARM} [999ms]
08-30 16:57:05.175 1795-2904/? I/ActivityManager: Killing 24711:com.tinder/u0a30 (adj 15): empty #7
08-30 16:57:05.214 1795-1795/? V/AlarmManager: done {6600843, *walarm*:com.whatsapp.messaging.r.CLIENT_PINGER_ACTION} [1041ms]
08-30 16:57:05.221 1795-1795/? V/AlarmManager: done {614903, *walarm*:com.google.android.gms.gcm.ACTION_CHECK_QUEUE} [1047ms]
08-30 16:57:05.222 3172-3172/? V/ConnectivityManager: isActiveNetworkMetered() returns:false
08-30 16:57:05.277 1795-3120/? I/ActivityManager: Start proc 26036:com.tinder/u0a30 for service com.tinder/.globalping.service.GlobalPingTaskService
08-30 16:57:05.345 1795-1795/? V/AlarmManager: done {70a69de, *alarm*:com.google.android.gms/.lockbox.LockboxAlarmReceiver} [1172ms]
08-30 16:57:05.368 1795-3607/? I/AccountManagerService: getTypesVisibleToCaller: isPermitted? true
08-30 16:57:05.518 26036-26036/? I/MultiDex: VM with version 2.1.0 has multidex support
08-30 16:57:05.518 26036-26036/? I/MultiDex: install
08-30 16:57:05.518 26036-26036/? I/MultiDex: VM has multidex support, MultiDex support library is disabled.
08-30 16:57:05.521 26036-26036/? I/TINDER: 20331b8
08-30 16:57:05.618 397-593/? I/ThermalEngine: Sensor:batt_therm:27000 mC
08-30 16:57:05.625 397-594/? I/ThermalEngine: Sensor:xo_therm_pu2:31000 mC
08-30 16:57:05.666 26036-26036/? I/CrashlyticsCore: Initializing Crashlytics 2.3.8.97
08-30 16:57:05.707 26036-26036/? D/Taplytics: Starting taplytics version 1.7.13
08-30 16:57:05.850 380-26096/? D/libc: dns server used:192.168.1.1
08-30 16:57:05.860 380-26096/? D/libc: dns server used:192.168.1.1
08-30 16:57:06.142 26036-26036/? W/ResourceType: No package identifier when getting value for resource number 0x00000000
08-30 16:57:06.156 26036-26036/? W/InstanceID/Rpc: Found 10020
08-30 16:57:06.166 3172-3172/? E/NetworkScheduler: com.tinder requested task be persisted for tag: 'global-ping' but does not hold the permission android.Manifest.permission.RECEIVE_BOOT_COMPLETED. This task won't be persisted.
08-30 16:57:06.169 3172-3172/? V/ConnectivityManager: isActiveNetworkMetered() returns:false
08-30 16:57:06.197 1795-2904/? I/ActivityManager: Killing 25165:com.instagram.android/u0a6 (adj 15): empty #7
08-30 16:57:06.209 1795-1805/? D/ConnectivityService: ConnectivityService NetworkRequestInfo binderDied(NetworkRequest [ id=164, legacyType=-1, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN] ], android.os.BinderProxy@4684d45)
08-30 16:57:06.211 1795-2339/? D/ConnectivityService: releasing NetworkRequest NetworkRequest [ id=164, legacyType=-1, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN] ]
08-30 16:57:06.220 1795-2339/? E/ConnectivityService: RemoteException caught trying to send a callback msg for NetworkRequest [ id=164, legacyType=-1, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN] ]
08-30 16:57:08.456 2369-2653/? I/NetworkController.MotorolaMobileSignalController(3): MotorolaMobilePhoneStateListener.onSignalStrengthsChanged: Entered: signalStrength=SignalStrength: 12 0 -120 -160 -120 -1 -1 99 2147483647 2147483647 2147483647 2147483647 2147483647 gsm|lte level=4
08-30 16:57:10.198 1795-13989/? D/NetlinkSocketObserver: NeighborEvent{elapsedMs=122289765, 192.168.1.1, [FC528D5B7958], RTM_NEWNEIGH, NUD_REACHABLE}
08-30 16:57:15.623 397-593/? I/ThermalEngine: Sensor:batt_therm:27000 mC
08-30 16:57:15.629 397-594/? I/ThermalEngine: Sensor:xo_therm_pu2:31000 mC
08-30 16:57:16.718 1795-13989/? D/NetlinkSocketObserver: NeighborEvent{elapsedMs=122296285, 192.168.1.1, [FC528D5B7958], RTM_NEWNEIGH, NUD_STALE}

Olá Guilherme,

As mensagens que você postou são apenas mensagens normais de log do Android. O que acontece quando você tenta executar a sua aplicação pelo Android Studio? Aparece algum pop-up de erro? Alguma mensagem em vermelho no console? Aparece algo no dispositivo?

Sim. aparece essa mensagem:

08/30 17:25:23: Launching ListaAlunosActivity
No local changes, not deploying APK
$ adb shell am start -n "com.example.gsav.agenda/com.example.gsav.agenda.ListaAlunosActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Error while executing: am start -n "com.example.gsav.agenda/com.example.gsav.agenda.ListaAlunosActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.gsav.agenda/.ListaAlunosActivity }
Error type 3
Error: Activity class {com.example.gsav.agenda/com.example.gsav.agenda.ListaAlunosActivity} does not exist.

Error while Launching activity

Certo, o Android Studio tá achando que o aplicativo já está instalado no celular. Vamos tentar fazer um rebuild completo pra ver se ele instala.

Só para garantir, primeiro reinicie o Android Studio. Depois vai na opção de menu Build > Clean project. Aguarde ele terminar o processo e logo em seguida vai na opção de menu Build > Rebuild project. Depois tenta executar novamente o seu aplicativo.

Agora deu certo. Tem como vc me explicar o porque agora ele funcionou? :)

Tem sim, o Android Studio por algum motivo não conseguiu perceber que o seu aplicativo foi desinstalado do celular. Quando você pediu para executar novamente, o correto seria ele instalar novamente mas ele analisou o aplicativo localmente e verificou que não tinha alterações para serem instaladas então ele só tentou executar o aplicativo que ele achava que já estava instalado no celular. Como não tinha nada instalado então ele não conseguia encontrar a activity prá iniciar o aplicativo. Tudo isso tá escrito na mensagem de erro:

08/30 17:25:23: Launching ListaAlunosActivity
No local changes, not deploying APK
$ adb shell am start -n "com.example.gsav.agenda/com.example.gsav.agenda.ListaAlunosActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Error while executing: am start -n "com.example.gsav.agenda/com.example.gsav.agenda.ListaAlunosActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.gsav.agenda/.ListaAlunosActivity }
Error type 3
Error: Activity class {com.example.gsav.agenda/com.example.gsav.agenda.ListaAlunosActivity} does not exist.

Error while Launching activity

No local changes, not deploying APK significa que ele não detectou nenhuma mudança portanto ele não precisa gerar novamente o APK do seu aplicativo

Error: Activity class {com.example.gsav.agenda/com.example.gsav.agenda.ListaAlunosActivity} does not exist. indica que ele não encontrou a ListaAlunosActivity que precisamos pra iniciar o aplicativo.

Quando a gente faz o clean e o rebuild, estamos falando para ele jogar tudo fora e construir a aplicação do zero. Agora como a aplicação foi construída do zero, ele instala novamente no celular porque ele não sabe se é a mesma versão que já está instalada!