Error while Launching activity

问题:

I recently downloaded Android Studio 2.0 and create a new startup app and did not add anything code by myself. After running the app, android studio installs the APK on emulator successfully but does not launch the app instead it gives the following error:

$ adb shell am start -n "com.example.muhammad.firstapp/com.example.muhammad.firstapp.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER  Unexpected error while executing: am start -n "com.example.muhammad.firstapp/com.example.muhammad.firstapp.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER  Error while Launching activity 

I searched it on google and found that it was asked before but the provided solution isn't working for me either. I also did not add anything in the AndroidManifest.xml file.

AndroidManifest.xml

MainActivity.java

package com.example.muhammad.firstapp; import android.support.v7.app.AppCompatActivity; import android.os.Bundle;  public class MainActivity extends AppCompatActivity {     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);     } } 

activity_main.xml

回答1:

I had exactly this same problem today [Android Studio 2.3.3, Android 8.0 on the phone]

This is what I discovered. The app that I was trying to install was not shown in the android Application window [the one where you have them all]. But once I went in: Settings->Apps&Notifications->AppInfo I could see this screenshot where it was said that this app was "not installed for this user":

At that point I entered the app->clicked on the three points in the top right corner->Uninstall for all the users

Now when I tried to run the project through Android Studio the error message disappeared and the app was correctly installed

Hope this helps, have a good day
Antonino

回答2:

If you are using android 2.0+, take the following steps
1. Go to run
2. Select edit configurations..
3. type -r in the Install Flags text field
4. Apply and Ok then run program again

tested(23/07/2016)

回答3:

There is issue with studio 2.0+ instant run feature

Work around provided at Android Open Source Project - Issue Tracker

Don't waste time in re installation of studio or cleaning gradle build file often .

Just add -r flag in Install flags in Run->Edit configurations->General

回答4:

I encounter the same problem in AVD, when first start app it was fine but when launch the app again it reports "Error while Launching activity".

My resolution is: in AVD, uninstall the apk, maybe the reason is the new Android studio has an issue when install apk to a AVD.

Thanks, Yu

回答5:

I've been working on this same exact problem for the last 8 hours...you've had no issues after rolling back from 2.0 to 1.5.1?

I've noticed that, even with the error, running the app works fine sometimes.

You're not alone, brother. I'll be sure to update when I figure out the solution.

Also, what are your specs? I'm running the following:

• Windows 7
• AMD FX(tm)-8120 8-Core

AVD:

• Android 6.0
• CPU/ABI: Google APIs ARM (armeabi-v7a)
• Target: API lvl 23
• No accelerometer
• heapSize: 64

If you want more details, let me know. A sample size of 2 is always better than 1.

回答6:

To fix this annoying problem I followed the three following steps:

1. Included the -r flag in the Install Flags. This may be accomplished by clicking on Run -> Edit Configurations. Now Select the General tab and type -r in the Install Flags text area.

2. Click on File and select Invalidate Caches / Restart.

3. Uninstall earlier versions of the app. By this I mean to remove it by accessing General -> Apps and uninstall the app. Dragging and dropping the icon of the app to the trash in the home screen will not fix the issue.

回答7:

After struggling for hours I came to conclusion that the problem is with the user files stored in AVD. Whenever I choose Wipe Data of an AVD the app works like a charm and does not show the error. But its really painful for developers to Wipe Data everytime before running the app as Wipe Data will only work if your emulator is not running.

In another test phase, I wiped the data of AVD and then started the app, it ran successully; but when I tried to run the app second time it shows me that error again.

Error while Launching activity 

Then I opened 'Manage Apps' and delete my app from emulator. But it did not work either.

Workaround

• Delete Android Studio but don't delete the SDK
• Download and Install Android Studio 1.5.1 from here http://tools.android.com/download/studio/stable

Another Workaround (But that does not work for me)

• Session 'app': Error Launching activity

Final Conclusion

I think the problem is with somewhere when we tried to 'Run' the app on second time. It does not uninstall the previous version of the app so when it found the package name already there it does not install the app then; results in error launching the activity.

回答8:

I have been install the new version 2.10 just now ,and the problem seems like to be solved.So you can try it.

回答9:

downgrading android version is not the curect way to fix the problem..if you like that you will lose new features of testing and developing in android studio.same kinda problem i faced previously when i upgrade to android 2.1.but i resolve my problem through restarting the android studio by selecting option of "setting->invalid caches/restart". Even though your problem is not fixed then try to create another avd with suitable system image. make sure that you have downloaded a suitable system image for your emulator to run in cpu.
i solved my emulator launching problem in android 2.1 by downloading system image x86-64 with api level 23.try to download this system image if you are using 64 bit.

回答10:

I had the same problem and solved it by following these steps:

1. Uninstall the app, in my case, from the actual hardware that is connected over the USB.

2. This is the key step! Uninstall the app from the "Recently uninstalled apps"

3. Rebuild the app.

4. Run it.

回答11:

Though I'm not sure about the exact reason for this problem, I just found a solution when I cleaned the project. So, go to Build -> Clean project. This should help you

回答12:

I had the same problem, in fact the last version of my application was disabled in the phone or emulator, to solve the problem just reactivated the application in my phone (settings-> apps-> disabled) and I recompile and the problem was solved.

回答13:

Maybe you just set your phone or emulator to refuse all the requests of installing apk through USB. Open your phone setting and change this to allow the installing. The problem is solved. Hope it works for you!

回答14:

I tried almost every solution found in the community, but the Error Launching activity never gone. Now I found what's the reason of my case.

I use a USB connected LG K20 Plus phone to test my projects built on the Android Studio 2.3.3, the Error Launching activity will appear if I uninstall the project in the phone, it will launch normally again if the deleted project is reinstalled.

I hope this will help people having the same or similar Error in your developing projects.

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