Error on running YouTube Activity in Android Studio

Question

Working on a Youtube App in Android Studio. I keep on getting the error:

The activity must be exported or contain an intent-filter

I have read documents and looked online but I can't seem to find a solution to this. What can I do about this? I will paste my main-activity code below.

YoutubeActivity.java

package com.code.mohamedali.hackathon2018;

import android.support.constraint.ConstraintLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.google.android.youtube.player.YouTubeBaseActivity;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;

public class YoutubeActivity extends YouTubeBaseActivity
      implements YouTubePlayer.OnInitializedListener  {

    private static final String TAG = "YoutubeActivity";
    static final String  GOOGLE_API_KEY = "AIzaSyDMS4J2hlSJqCZsNL1Owqcups91vGQiF3I";
    static final String YOUTUBE_VIDEO = "d-diB65scQU";
    static final String YOUTUBE_PLAYLIST = "RDQMhH0aPyrY-R0";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_youtube);

    ConstraintLayout mylayout = (ConstraintLayout) getLayoutInflater().inflate(R.layout.activity_youtube,null);
    setContentView(mylayout);

    YouTubePlayerView playerView = new YouTubePlayerView(this);
    playerView.setLayoutParams(new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    mylayout.addView(playerView);
    playerView.initialize(GOOGLE_API_KEY,this);
}

@Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean wasRestored) {

    Log.d(TAG, "onInitializationSuccess: provider is " + provider.getClass().toString() );
    Toast.makeText(this,"Initliazed youtube player succesfully" , Toast.LENGTH_LONG).show();


    // Now we are using the Event Listener and the StateChange Listener
    youTubePlayer.setPlaybackEventListener(playbackEventListener);
    youTubePlayer.setPlayerStateChangeListener(playerStateChangeListener);



    if(!wasRestored){
        youTubePlayer.cueVideo(YOUTUBE_VIDEO);
    }


}

@Override
public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {

    final int REQUEST_CODE = 1;

    if(youTubeInitializationResult.isUserRecoverableError()){
        youTubeInitializationResult.getErrorDialog(this,REQUEST_CODE).show();
    }else{
        String errorMessage = String.format("There was an error initialiazing youtube player (%1$s)", youTubeInitializationResult.toString());
        Toast.makeText(this,errorMessage,Toast.LENGTH_LONG).show();
    }


}


private YouTubePlayer.PlaybackEventListener playbackEventListener = new YouTubePlayer.PlaybackEventListener() {
    @Override
    public void onPlaying() {
        Toast.makeText(YoutubeActivity.this, "Good, video is playing ok", Toast.LENGTH_LONG).show();

    }

    @Override
    public void onPaused() {
        Toast.makeText(YoutubeActivity.this, "Good, video is paused", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onStopped() {
        Toast.makeText(YoutubeActivity.this,"Video has been stopped" , Toast.LENGTH_LONG).show();


    }

    @Override
    public void onBuffering(boolean b) {

    }

    @Override
    public void onSeekTo(int i) {

    }
};

private YouTubePlayer.PlayerStateChangeListener playerStateChangeListener = new YouTubePlayer.PlayerStateChangeListener() {
    @Override
    public void onLoading() {

    }

    @Override
    public void onLoaded(String s) {

    }

    @Override
    public void onAdStarted() {
        Toast.makeText(YoutubeActivity.this,"Click Ad now, make me rich" , Toast.LENGTH_LONG).show();


    }

    @Override
    public void onVideoStarted() {
        Toast.makeText(YoutubeActivity.this,"Video has started" , Toast.LENGTH_LONG).show();


    }

    @Override
    public void onVideoEnded() {
        Toast.makeText(YoutubeActivity.this,"You have reached the end of the 
video" , Toast.LENGTH_LONG).show();


    }

    @Override
    public void onError(YouTubePlayer.ErrorReason errorReason) {

    }
};

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.code.mohamedali.hackathon2018">

<uses-permission android:name="android.permission.INTERNET" />

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

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".YoutubeActivity"
    android:label="Youtube Player">
    </activity>

    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="@string/google_maps_key" />

    <activity
        android:name=".MapsActivity"
        android:label="@string/title_activity_maps">

        </activity>
    </application>

</manifest>

Answer 1

Try to add android:exported="true" to Activity.

<activity android:name=".YoutubeActivity"
 android:exported="true"
android:label="Youtube Player">
</activity>

Make sure the Run configuration for app contain MainActivity as launcher .