onCreate() is not called

Question

This is the code I am using

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

    showVoiceText.setText("I am working");
}

However it seems not to be called... It never displays "I am working"

This is my xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.phoenix.coreai.HomeActivity">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Core A.I."
    android:id="@+id/showVoiceOutput"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Enable voice control"
    tools:layout_editor_absoluteX="88dp"
    tools:layout_editor_absoluteY="167dp" />

</android.support.constraint.ConstraintLayout>

This is not my main activity, my main activity is just an intro playing a small mp4 file

This is the main activity code

package com.example.phoenix.coreai;


import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.VideoView;

public class MainActivity extends AppCompatActivity {

    VideoView view;
    private static int SPLASH_TIME_OUT = 2700;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        view = (VideoView) findViewById(R.id.videoView);
        videoPlay(view);
        new Handler().postDelayed(new Runnable(){
            @Override
            public void run(){
                Intent homeIntent = new Intent(MainActivity.this, HomeActivity.class);
                startActivity(homeIntent);
                finish();
            }
        },SPLASH_TIME_OUT);
    }

    public void videoPlay(View v){

        String videoPath = "android.resource://com.example.phoenix.coreai/" + R.raw.spashscreen;
        Uri uri = Uri.parse(videoPath);
        view.setVideoURI(uri);
        view.start();
    }
}

and this is the xml of the main activity

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="#000000"
    tools:context="com.example.phoenix.coreai.MainActivity">


    <VideoView
        android:id="@+id/videoView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:layout_marginTop="-27dp"
        app:layout_constraintTop_toTopOf="parent"
        tools:layout_editor_absoluteX="0dp">

    </VideoView>


</LinearLayout>

I cannot debug the application through my mobile it has a custom rom and android studio wont recognize it

Let's assume that I would like to call this void from onCreate

private void musicScan(){
    File f = new File(path);
    File file[] = f.listFiles();
    fileArray = new String[file.length];
    for (int i = 0; i < file.length; ++i){
        fileArray[i] = file[i].getName();
    }
}

It does not seem to execute the void that I am calling

Answer 1

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    TextView showVoiceText = (TextView) findViewById(R.id.showVoiceOutput);

    showVoiceText.setText("I am working");
}

[maybe you need to remove the first "TextView" if it is already declared in another place, but since we don't have the whole code...]

But still will be good to know how your main activity start/call this activity

Answer 2

I think the problem is that you declared a global TextView and called it showVoiceText but you never initialise it

the solution is to initialise it after the setContentView like the following:

showVoiceText=(TextView) findViewById(R.id.showVoiceOutput);