CODEWITHSUNDEEP
androidandroid-activityinstantiationlistactivity
Kohls
Kohls

Reputation: 908

Android "extends ListActivity" error, unable to instantiate activity componentinfo

Hello guys this is my first question here, and yes I saw a lot of questions and answears like these and tried all the ways but I always get ~unable to instantiate activity componentinfo~ here I'll give my code, I'm just trying to make a simple list of Strings.

Here we come!

That's my class:

@package br.com.volkmann.volkmannbus;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

public class ConsultaActivity extends ListActivity {

String[] lista = {
        "12:30",
        "13:00"
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_consulta);
    setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, lista));

}

}

And this one my XML, Activity:

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#f8f18b" >

<ListView
    android:id="@+id/listaHora"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >
</ListView>
</LinearLayout>

Every time I start the activity there comes the error!

And this is the class that creates the Intent:

package br.com.volkmann.volkmannbus;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;

public class HorarioActivity extends Activity {

private Button btConsulta;

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

    btConsulta = (Button) findViewById(R.id.btConsulta);
    btConsulta.setOnClickListener(cliqueConsulta);
    }
      View.OnClickListener cliqueConsulta = new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(HorarioActivity.this, ConsultaActivity.class);
        startActivity(intent);
    }
};
 }

That's the most especific I got! Sorry for bad english, I'm a Brazilian!

Upvotes: 1

Views: 967

Answers (3)

Blundell
Blundell

Reputation: 76506

change 

<ListView
    android:id="@+id/listaHora"

to 

<ListView
    android:id="@android:id/list"

example code here http://developer.android.com/reference/android/app/ListActivity.html

Upvotes: 1

Raghunandan
Raghunandan

Reputation: 133560

You should change to

 <ListView android:id="@android:id/list

Read this

http://developer.android.com/reference/android/app/ListActivity.html

In your case you get rid of setContentView(R.layout.activity_consulta); as you have no other view's in your xml.

The ListActivity has a default layout that consists of a single, full-screen list in the center of the screen

Upvotes: 1

laalto
laalto

Reputation: 152827

With ListActivity your layout must contain a ListView with id @android:id/list but you have @+id/listaHora.

Other than that, have a look at the exception stacktrace in logcat, especially the "caused by" exception. Also when having such problems, include the full stacktrace in the question.

Upvotes: 1

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