Reputation: 1424

Android error "unable to find explicit activity class"

I have an android project with several packages. The structure of the packages in this case is com.WAPP.SetLocation is the package that contains the activity I want to run.

In my manifest, com.WAPP is considered the base package:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.WAPP"
      android:versionCode="1"
      android:versionName="1.0">

My activities are declared in my manifest as:

<activity android:name=".mainScreenActivity"></activity>
<activity android:name=".SetLocation.setLocationActivity"></activity>

The mainScreen activity displays fine, since it is inside the com.WAPP package. But when I try to run the setLocationActivity, I get the unable to find explicit class error. Here is how I have the intent parameters:

Intent i = new Intent();
            i.setClassName("com.WAPP.SetLocation",
                           "com.WAPP.SetLocation.setLocationActivity");
            startActivity(i);

Upvotes: 43

Answers (13)

Stanjhae

Reputation: 284

For anyone who encounters this issue specifically for react native:

If you're using firebase dynamic links on Android 13, you need to explicitly define the host and scheme in your AndroidManifext.xml

Let's say your dynamic link looks like this:

https://example.page.link/?link=https://www.example.com/someresource&apn=com.example.android&amv=3&ibi=com.example.ios&isi=1234567&ius=exampleapp

You need to set the host to example.com and scheme to https

The reason is in Android 13, non-matching intents are blocked https://developer.android.com/about/versions/13/behavior-changes-all#intents

Example:

<application
      android:name=".MainApplication"
      android:label="@string/app_name"
      android:icon="@mipmap/ic_launcher"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:allowBackup="false"
      android:theme="@style/AppTheme"
      android:requestLegacyExternalStorage="true"
        >
      <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|screenSize|smallestScreenSize|uiMode"
        android:launchMode="singleTask"
        android:windowSoftInputMode="adjustResize"
          android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
        <intent-filter>
            <action android:name="android.intent.action.VIEW"/>
            <category android:name="android.intent.category.DEFAULT"/>
            <category android:name="android.intent.category.BROWSABLE"/>
            <data
                android:host="example.com"
                android:scheme="https"/>
            <data
                android:host="sample.com" //You need to add other domains if you have more than one link.
                android:scheme="https"/>
        </intent-filter>
      </activity>
    </application>

This issue helped a lot https://github.com/firebase/firebase-android-sdk/issues/4198

Upvotes: 0

dılo sürücü

Reputation: 4201

you should class ad to manifest.xml for example of manifest.xml in this example, i added SecondActivity.class

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MyApplication">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".SecondActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Upvotes: 2

Vaibhav Pallod

Reputation: 524

Thia might be problem if ImageView is used :(

Intent intent = new Intent(context,ImageView.class);
                        intent.putExtra("imageurl",clients_document_return.getUrl());
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                        v.getContext().startActivity(intent);

and your class name might me Imageview.class so first check all small capital in class name

Thanks :)

Upvotes: 0

shivambhanvadia

Reputation: 527

First of all, make sure that you have created activity and not the class. And, if it is activity then go to the manifest.xml file and look at the path of that particular file.

This worked for me absolutely well!!

https://forums.xamarin.com/discussion/104102/android-content-activitynotfoundexception-unable-to-find-explicit-activity-class

this is for reference

Upvotes: 1

Hassan Asghar

Reputation: 11

This might be due to not registering your next activity XML file in the manifest. Register your next activity XML file in the AndroidManifest.xml file

<activity android:name=".NextActivity" />

Hope it helps.

Upvotes: 0

Aakib Jabbar

Reputation: 119

I had the same kind of issue in the project . It wasted me almost a full day . i tried all the solutions that are mentioned above , but none of the solutions worked for me . After all the hard work i just "Rebuild" the project and "clean" The project and it worked perfectly . Note: Before going through all the process u just needed to have a try to these options.

Upvotes: 1

Amadeus Sanchez

Reputation: 2565

In Xamarin Android, make sure that your Activity class has an Activity attribute

[Activity(Theme = "@style/MyTheme")]
public class MyActivity : ActivityBase
{
...
}

With that you are making sure that your activity is registered in AndroidManifest.xml

Upvotes: 1

Michal Palczewski

Reputation: 918

in your manifest you declared it as .SetLoction.setLocationActivity but the package name is com.WAPP.SetLocation so you need to prefix that again.

Intent i = new Intent();
            i.setClassName("com.WAPP.SetLocation",
                           "com.WAPP.SetLocation.SetLocation.setLocationActivity");
            startActivity(i);

Upvotes: 0

polis

Reputation: 933

In additional to the above answers make sure that your activities are declared inside application in manifest

<application
    android:allowBackup="true"
    android:label="@string/app_name"
    android:supportsRtl="true">

    <activity android:name=".mainScreenActivity"></activity>
    <activity android:name=".SetLocation.setLocationActivity"></activity>

</application>

Upvotes: 15

Huy Hóm Hỉnh

Reputation: 617

If the new activity not in the same packet with MainActivity(you call from here?), try declare on manifest

<activity android:name="com.WAPP.SetLocation.setLocationActivity"></activity>

and in the caller

Intent intent = new Intent(this, setLocationActivity.class);
startActivity(intent);

Hope this helps!

Upvotes: 21

Daniel De León

Reputation: 13639

Do it by this way:

Intent intent = new Intent();
intent.setComponent(
        new ComponentName("com.WAPP", "com.WAPP.SetLocation.setLocationActivity"));
startActivity(i);

Upvotes: 3

Jeremy Edwards

Reputation: 14740

The first parameter is application package not the package where the activity is.

You can invoke the Activity like this.

Intent i = new Intent();
i.setClassName("com.WAPP",
               "com.WAPP.SetLocation.setLocationActivity");
startActivity(i);

It is preferred as SYLARRR suggested to have Android automatically figure that out for you. Hence the call as..

startActivity(new Intent(this, setLocationActivity.class));

It's recommended per java standards to have the package name all lower-cased and the class name as CamelCased.

Upvotes: 32

Indrek Kõue

Reputation: 6449

If i'm not mistaken, the i.setClassName("com.WAPP.SetLocation","com.WAPP.SetLocation.setLocationActivity"); should be i.setClassName(getBaseContext(),"setLocationActivity"); Reference

Also try this syntax:

startActivity(new Intent(MyActivity.this, setLocationActivity.class));

and try removing the starting dot from:

<activity android:name=".SetLocation.setLocationActivity"></activity>

Upvotes: 4

Android error &quot;unable to find explicit activity class&quot;

Answers (13)

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Android error "unable to find explicit activity class"