Splashscreen nao ativa

Programação
#1

Bom dia pessoal!
Desculpe atrapalhar é o seguinte; configurei meu splashscreen porém no meu emulador não roda ele fica apenas na tela padrão… segue os prints pra saber se há algo de errado na programação…
package turitecnologia.com.pneudigital;

import android.content.Intent;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class SplashActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            mostrarMainActivity();
        }
    }, 5000);
}


private void mostrarMainActivity() {
    Intent intent = new Intent(
            SplashActivity.this,MainActivity.class
    );
    startActivity(intent);
    finish();
}

}

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width=“match_parent"
android:layout_height=“match_parent"
tools:context=”.SplashActivity”>

</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?> 

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

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".Main2Activity" />
    <activity android:name=".Main3Activity"></activity>
</application>
<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width=“match_parent"
android:background=”@color/colorPrimary"
android:layout_height=“match_parent”

tools:context=".Main3Activity">

</android.support.constraint.ConstraintLayout>