xml layout won't display on emulator - android-studio

Question

I've been working on an app, all the code seems to be fine, xml and java. When i run the app in an emulator, my splash screen is no longer running, when i click on a button, it takes me to the right page but does not show me the layout of the file.
When i edit the xml file layout, the changes are not being shown on the app when it runs in the emulator.
i'll post the code below:
This code is for the xml layout of the page:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:background="#drawable/bgapp"
tools:context=".complain">
<ImageView
android:layout_width="310dp"
android:layout_height="86dp"
android:layout_marginLeft="45dp"
android:src="#drawable/bfcfulllogotransparent" />
<ImageView
android:layout_width="79dp"
android:layout_height="76dp"
android:layout_marginLeft="160dp"
android:layout_marginTop="500dp"
android:src="#drawable/bfchandtransparent"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Making a Complaint"
android:textAllCaps="false"
android:layout_marginTop="75dp"
android:textAlignment="center"
android:textColor="#ffff"
android:textStyle="bold"
android:textSize="18dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:layout_marginHorizontal="10dp"
android:textAlignment="center"
android:textColor="#ffff"
android:textAllCaps="false"
android:text="There may be times when you feel that you are not happy with the services you have been provided, it is your right to be able to make a complaint about these issues.
"
android:fontFamily="sans-serif"
android:textSize="16dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="190dp"
android:layout_marginHorizontal="10dp"
android:textAlignment="center"
android:textColor="#ffff"
android:textAllCaps="false"
android:text="There are a number of ways that you can make a complaint…"
android:fontFamily="sans-serif"
android:textSize="16dp"/>
<Button
android:id="#+id/butthow"
android:layout_width="273dp"
android:layout_height="66dp"
android:layout_marginLeft="55dp"
android:layout_marginTop="280dp"
android:background="#drawable/custom_button"
android:text="How to make a complaint"
android:textAllCaps="false"
android:textColor="#ffff"
android:textSize="18dp"
android:textStyle="bold"/>
<Button
android:id="#+id/buttwhat"
android:layout_width="273dp"
android:layout_height="66dp"
android:layout_marginLeft="55dp"
android:layout_marginTop="380dp"
android:background="#drawable/custom_button"
android:text="What happens to your complaint"
android:textAllCaps="false"
android:textColor="#ffff"
android:textSize="18dp"
android:textStyle="bold"/>
</RelativeLayout>
This code is for the xml for the splash screen:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
android:background="#drawable/bgapp"
tools:context=".splashscreen">
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="3dp"
android:text="Childrens Guide"
android:textColor="#ffff"
android:textSize="35dp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="#+id/textView4"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView4" />
<TextView
android:id="#+id/textView4"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:layout_marginBottom="214dp"
android:text="A guide for children living in foster care"
android:textAlignment="center"
android:textColor="#ffff"
android:textSize="20dp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="#+id/imageView5"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView3" />
<ImageView
android:id="#+id/imageView4"
android:layout_width="350dp"
android:layout_height="100dp"
android:layout_marginStart="15dp"
android:layout_marginTop="27dp"
android:layout_marginEnd="15dp"
android:layout_marginBottom="133dp"
android:src="#drawable/bfcfulllogotransparent"
app:layout_constraintBottom_toTopOf="#+id/imageView6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/imageView5"
android:layout_width="101dp"
android:layout_height="0dp"
android:layout_marginBottom="41dp"
android:src="#drawable/bfchandtransparent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView4" />
<ImageView
android:id="#+id/imageView6"
android:layout_width="1000dp"
android:layout_height="200dp"
android:layout_marginStart="18dp"
android:layout_marginEnd="18dp"
android:layout_marginBottom="173dp"
android:src="#drawable/coverkids"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView4" />
</androidx.constraintlayout.widget.ConstraintLayout>
this is the java for the splashscreen:
package com.example.bfcchildrensguidenew;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
public class splashscreen extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splashscreen);
Thread myThread = new Thread() {
#Override
public void run() {
try {
sleep(3000 );
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
finish();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
myThread.start();
}
}

Answer 1

You can not call startActivity method outside of main thread(UI thread), it will crash.
User handler instead a Thread.
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
#Override
public void run() {
Intent intent = new Intent (getApplicationContext(),MainActivity.this);
startActivity(intent);
}
});