Error when switching from Portrait to Landscape

Question

My Android app is simple. It has only 1 activity. I created two layouts for the same activity: one for the portrait position (inside the res/layout folder) and one for the landscape position (inside the res/layout-land folder). I give the code for both at the end of this question.

I have nothing special inside the myActivity.java file, I just inflate the layout:

package com.example.myApp;

import android.app.Activity;
import android.os.Bundle;

public class MCentralActivity extends Activity {

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

}
}

Everything works fine at this point. If I hold my device in the portrait position, the app will call the appropriate XML. It works like a charm too, in case I decide to hold it in the landscape position.

The problem arises when I decide to add a little bit of code to the aforementioned myActivity.java file; it is still really simple!

package com.example.myApp;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

public class MCentralActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    ImageButton ibPacientes;
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_myActivity);
    ibPacientes = (ImageButton)findViewById(R.id.imageButton_Pacientes);
    ibPacientes.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //NOTHING INSIDE HERE!!
        }

    });

}
}

After implementing that little code, if I decide to go landscape, the App will stop abruptly saying "Unfortunately myApp has stopped". Interesting enough this won't occur if I don't implement onClickListener!

The exact error given by LogCat is as shown:

03-28 13:39:27.870: E/SurfaceFlinger(157): DRAW orientation 1 viewport:(0, 0, 1920, 1080) frame(0, 0, 1920, 1080)
03-28 13:39:15.360: E/SurfaceFlinger(157): STATE orientation 1 viewport:(0, 0, 1920, 1080) frame(0, 0, 1920, 1080)
03-28 13:39:15.360: I/SurfaceFlinger(157): @@@@@@@@ orientation:1, transformOri:4

Don't think the layout XML files has to do much in my problem, but I will copy and paste them in this link (for portrait) and this other link (for landscape), in order to not to make this question excessively long.

Thanks in advance!

Answer 1

In your landscape XML file you have the ImageButton called imageButton_Users instead of imageButton_Pacientes. Rename it and everything should work fine.

You're trying to find a view that's not there and so your app will crash.