Session 'app': Error Launching activity

Issue

After the Android Studio 2.0 update while the gradle build finishes I get this :

Session ‘app’: Error Launching activity .

It prevents the app from starting but it’s installed in my emulator.
This is what comes up in the Run tab :

Unexpected error while executing: am start -n "com.example.user.ypologismosmoriwn/com.example.user.ypologismosmoriwn.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Error while Launching activity

Here is the code:

package com.example.user.ypologismosmoriwn;

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);
    }
}

It’s just an empty Activity,nothing added

and the XML code is just a Relative Layout with 4 Texts and 3 Check Boxes

This is the logcat i am getting

Thanks anyone who is willing to help

Solution

I also faced this issue after I updated to AS2.0. I found that it is because of the instant run enabled. So my solution is to disable the “instant run”. and it worked. To disable “instant run”, you can go to Preference Dialog ( May be Setting dialog on Windows), then select Build, Execution, Deployment > Instant Run, and uncheck all the checkbox to disable Instant Run.

This is my temporary solution and it may help you. Later, I’ll find a better way to this issue.


update by 2016/06/06

A better solution instead of disabling instant run.
Remove the .idea folder and .gradle folder, then click button Sync Project with Gradle Files (or through the menu File -> Sync Project with Gradle Files), after this process finished, you are able to run your app as normal.

Good Luck~

Answered By – Nick

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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