package com.elegos.test; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView;
public class ListViewTest extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView myText = (TextView)findViewById(R.id.myTextView); Button nextButton = (Button)findViewById(R.id.ButtonNext); nextButton.setOnClickListener(new Button.OnClickListener() { public void onClick (View v){ Intent nextIntent=new Intent (ListViewTes.this,ExmpActivity.class); startActivity(nextIntent); }); }} U will create another activity by name ExmpActivity as follows package com.elegos.test; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class ExmpActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.xyz); Button backButton = (Button)findViewById(R.id.ButtonBack); backButton.setOnClickListener(new Button.OnClickListener() { public void onClick (View v){ Intent backIntent=new Intent (ExmpActivity.this,ListViewTes.class); startActivity(backIntent); }); } } On Jul 22, 2:27 pm, elegos <furlan.giac...@gmail.com> wrote: > Hello there! > > I'm a newbie in Android programming, and was exploring the possibility > to switch between more than - one - layouts (i.e. more pages?). > > So I've created a new XML layout page (called second.xml) and created > some things in there. At least I've created a button to switch back to > the first layout, but a NullPointerException fires up when the > application starts, and that only for the "back" button, while the > "next" button just works great. > > Any suggestion? > Thanks :) > > package com.elegos.test; > > import android.app.Activity; > import android.os.Bundle; > import android.view.View; > import android.view.View.OnClickListener; > import android.widget.Button; > import android.widget.TextView; > > public class ListViewTest extends Activity { > /** Called when the activity is first created. */ > @Override > public void onCreate(Bundle savedInstanceState) { > super.onCreate(savedInstanceState); > setContentView(R.layout.main); > > TextView myText = (TextView)findViewById(R.id.myTextView); > > Button nextButton = (Button)findViewById(R.id.ButtonNext); > Button backButton = (Button)findViewById(R.id.ButtonBack); > > nextButton.setOnClickListener(getCListener(R.layout.second)); > try {backButton.setOnClickListener(getCListener > (R.layout.main));} catch(Exception e) {myText.append("\n"+e.toString > ());} > } > > final private OnClickListener getCListener(final int layout) { > return new Button.OnClickListener() { > public void onClick(View v) { > setContentView(layout); > } > }; > } > > } --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" group. To post to this group, send email to android-beginners@googlegroups.com To unsubscribe from this group, send email to android-beginners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en -~----------~----~----~----~------~----~------~--~---