Objects in Android do not appear in place [duplicated]

I came from java some time ago, but I felt the need to make an application on Android. The case, that when I compile my program with the Android Studio simulator, things appear hidden in the upper left corner. I searched all over the internet, and I did not find a solution that suited me. I enclose the XML code of the visualization and the code in Java if necessary.

XML:

<?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=".MainActivity">

<TextView
    android:id="@+id/tv3"
    android:layout_width="77dp"
    android:layout_height="25dp"
    android:text="Iteraciones"
    android:textColor="@android:color/black"
    android:textSize="16sp"
    app:fontFamily="sans-serif-condensed"
    tools:layout_editor_absoluteX="154dp"
    tools:layout_editor_absoluteY="153dp" />

<TextView
    android:id="@+id/tv4"
    android:layout_width="137dp"
    android:layout_height="28dp"
    android:textColor="@android:color/black"
    android:textSize="16sp"
    app:fontFamily="sans-serif-condensed"
    tools:layout_editor_absoluteX="179dp"
    tools:layout_editor_absoluteY="51dp" />

<TextView
    android:id="@+id/tv5"
    android:layout_width="285dp"
    android:layout_height="249dp"
    android:textColor="@android:color/black"
    android:textSize="16sp"
    app:fontFamily="sans-serif-condensed"
    tools:layout_editor_absoluteX="50dp"
    tools:layout_editor_absoluteY="194dp" />

<TextView
    android:id="@+id/tv2"
    android:layout_width="153dp"
    android:layout_height="28dp"
    android:text="Número de Iteraciones:"
    android:textColor="@android:color/black"
    android:textSize="16sp"
    app:fontFamily="sans-serif-condensed"
    tools:layout_editor_absoluteX="16dp"
    tools:layout_editor_absoluteY="51dp" />

<TextView
    android:id="@+id/tv"
    android:layout_width="153dp"
    android:layout_height="28dp"
    android:text="Número a Computar:"
    android:textColor="@android:color/black"
    android:textSize="16sp"
    app:fontFamily="sans-serif-condensed"
    tools:layout_editor_absoluteX="16dp"
    tools:layout_editor_absoluteY="16dp" />

<EditText
    android:id="@+id/et1"
    android:layout_width="139dp"
    android:layout_height="33dp"
    android:ems="10"
    android:inputType="textPersonName"
    android:text="Name"
    android:textSize="12sp"
    tools:layout_editor_absoluteX="179dp"
    tools:layout_editor_absoluteY="16dp" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="compute"
    android:text="Computar"
    tools:layout_editor_absoluteX="40dp"
    tools:layout_editor_absoluteY="105dp" />

</android.support.constraint.ConstraintLayout>

JAVA:

package luiss.collatz;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View;

public class MainActivity extends AppCompatActivity {

private EditText et1;
private TextView tv4,tv5;

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

    et1=(EditText)findViewById(R.id.et1);
    tv4=(TextView)findViewById(R.id.tv4);
    tv5=(TextView)findViewById(R.id.tv5);
}

public void compute(View view) {
    String ns = et1.getText().toString();
    int n = Integer.parseInt(ns);
    int i = 0;
    int x = n;
    String[] a = new String[200];
    String f;
    while (x > 1) {

        if(x % 2 == 0){
            x = x/2;
        }
        else {
            x = (3*x)+1;
        }

        System.out.println(x);

        a[i] = (""+x);

        i++;

    }
    f = String.join(", ", a);
    tv4.setText(""+i);
    tv5.setText(""+n+", "+f);
    }
 }