CODEWITHSUNDEEP
androidandroid-studiointellij-idea
iAteABug_And_iLiked_it
iAteABug_And_iLiked_it

Reputation: 3795

Android Studio cannot find default activity

I've struggled with this for two days now.No matter what I do, Android Studio 2.1.1 , running on windows 10 64 keeps throwing

Could not identify launch activity: Default Activity not found Error while Launching activity .

Also, syntax highlighting for java files isn't working either, i.e. my MainActivity.java file has no syntax checking at all.

I've had no luck with any SO answers which mainly included one or more of the below:

I've tried

1- Invalidating caches and restarting android studio

2- Cleaning/Rebuilding

3- Restarting windows

4- Completely removing android studio and reinstalling from scratch

5- Gradle resync

6- Trying to create new projects with varying SDKs just to get atleast one to build- none does

Any ideas why this is happening? For reference , my files are below

MainActivity.java:
package com.example.simpleapp.simpleapp;

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);
    }
}

AndroidManifest.xml ( the .MainActivity is in red, it can't find that either)

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.simpleapp.simpleapp">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Gradle Project File

 buildscript {
        repositories {
            jcenter()
        }
        dependencies {
            classpath 'com.android.tools.build:gradle:2.1.0'

            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            jcenter()
        }
    }

    task clean(type: Delete) {
        delete rootProject.buildDir
    }

Gradle Module file

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example.simpleapp.simpleapp"
        minSdkVersion 21
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'
}

Thanks

Upvotes: 1

Views: 6712

Answers (4)

Pedro Gonzalez
Pedro Gonzalez

Reputation: 1459

The problem could be in the Manifest file. In my case, I did some refactoring that affected the 'activity' tags, (after changing a variable 'activity' into 'mActivity'), that's why it could not find the launcher Activity.

Upvotes: 0

hasan
hasan

Reputation: 27

My problem was MainActivity.java not identifying as class.

I went to File -> Settings -> Editor -> FileTypes and removed "MainActivity.java" in the right hand pane under "Recognized File Types".

in my case it was in txt file types.

Upvotes: 0

iAteABug_And_iLiked_it
iAteABug_And_iLiked_it

Reputation: 3795

OK after many frustrating hours, I discovered that somehow "MainActivity.java" got added as a recognized file type. No idea how, but as the default name for all activities added with Add->New Activity wizard is "MainActivity", android studio always treated "MainActivity.java" as jsp. So every time I added a new activity , it could never find the main activity!

I went to File -> Settings -> Editor -> FileTypes and removed "MainActivity.java" in the right hand pane under "Recognized File Types".

Screenshot showing Recognized File Types box

This fixed the problem. Hope it helps someone else.

Upvotes: 1

venkatesh venkey
venkatesh venkey

Reputation: 391

Give total path of your .MainActivity in Manifest.xml file

   <activity android:name="com.example.simpleapp.simpleapp.MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

This based upon:-

Default launcher activity defined here and that will be pointing to android:name tag where MainActivty exist.When ever activity tad does n't found in manifest it will through "Could not identify launch activity: Default Activity not found Error while Launching activity" .User might be changed the package in middle will cause this issue

Upvotes: 1

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