the android emulator error

this is the error that appears in the logcat, could you support me on this?
02-10 20:01:31.843 3974-3974/com.hamza.funfact E/AndroidRuntime: FATAL EXCEPTION: main Process: com.hamza.funfact, PID: 3974 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hamza.funfact/com.hamza.funfact.funfactsactivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at com.hamza.funfact.funfactsactivity.onCreate(funfactsactivity.java:32) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread

and this is my code:

package com.hamza.funfact;

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

public class funfactsactivity extends AppCompatActivity {
// Declare our view varaiabels
    private TextView facttextview;
    private Button showfactbuttom;

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

   // assign t he views from layout files to the corresponding variables
        facttextview = findViewById(R.id.facttextview);

    showfactbuttom= findViewById(R.id.showfactbutton);
        View.OnClickListener listener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String fact="ostriches run faster than horses";
                facttextview.setText(fact);

            }
        };
    showfactbuttom.setOnClickListener(listener);
    }
}

Got that - I need your XML too, please.

Thanks,

Steve.

I need the layout file, not the manifest.

this is my xml file:

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

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Could you paste in the layout file where you defined your TextView and Button in the XML.

this is the layout file as per your request

<?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="@android:color/holo_blue_bright" android:padding="50dp" tools:context="com.hamza.funfact.funfactsactivity">

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@android:color/holo_blue_bright"
    android:text="Did You Know!"
    android:textColor="#b0ffffff"
    android:textColorLink="#c8ffffff"
    android:textSize="24sp" />

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_centerVertical="true"
    android:text="Ants stretch when they wake up in the morning!"
    android:textColor="@android:color/background_light"
    android:textSize="24sp" />

<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:background="@android:color/holo_blue_dark"
    android:text="Another Fun Fact!"
    android:textColor="@android:color/background_light" />

</RelativeLayout>

not all hero's wear cape, thanks a billion Steve much appropriated :D

No problem!

greetings Steve, one more thing, on the onclick view statement once i click the button on the app, it doesn't change and closes the on its own, is there away to fix this? would appropriate it

Sorry for the slow response; I have been out with friends; Saturday night! Home now.

What is your app doing when you load it up. Does the 'fact' not appear when you hit the button?

Steve.

Greetings Steve! sorry for the delay been busy, its great to take some time to have some fun!, and no worries its handled, the id of factTextview = (TextView) findViewById(R.id.facttextView); isnt correct and should be (R.id.textView) as what i have in the xml layer folder, thanks anyway :D