using two or more activty on Android: code below, dont know whats the problem

Question

package and.views;

import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem;

public class androidView extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(0,0, 0, "AutoComplete"); menu.add(0,1, 1, "Button"); menu.add(0,2, 2, "CheckBox"); menu.add(0,3, 3, "EditText"); menu.add(0,4, 4, "RadioGroup"); menu.add(0,5, 5, "Spinner");

    return true;
}
/** Override onOptionsItemSelected to execute code for each menu item */
public boolean onOptionsItemSelected(MenuItem item)
{
    switch(item.getItemId())
    {
    case 0:
        showAutoComplete();
        return true;
    case 1:
        return true;
    case 2:
        return true;
    case 3:
        return true;
    case 4:
        return true;
    case 5:
        return true;

    }
    return true;
}

public void showAutoComplete() { Intent autocomplete = new Intent(this, AutoComplete.class);
try{

    this.startActivity(autocomplete);

} catch(Exception e) { System.out.print(" activity not found"); } } }

---

2nd class

package and.views;

import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; import android.widget.Button;

public class AutoComplete extends Activity{ public void onCreate(Bundle icircle) { super.onCreate(icircle); setContentView(R.layout.autocomplete); ArrayAdapter monthArray=new ArrayAdapter(this, android.R.layout.simple_list_item_1, Months); final AutoCompleteTextView textView= (AutoCompleteTextView)findViewById(R.id.testAutoComplete); textView.setAdapter(monthArray); final Button changeButton=(Button)findViewById(R.id.testAutoComplete); changeButton.setOnClickListener(new Button.OnClickListener(){ public void onClick(View v) { changeOption(textView); }

   });
   final Button changeButton2 = (Button) findViewById(R.id.textColorButton);
   changeButton2.setOnClickListener(new Button.OnClickListener() 
   { public void onClick(View v)
   { changeOption2(textView);
   }
   });

}   
static final String[]Months= new String[]{ "January","February","March","April","May","June","July","August", "September","October","November","December" }; 
public void changeOption(AutoCompleteTextView text)

{ 
    if (text.getHeight()==100){ text.setHeight(30);
} 
else
    { 
    text.setHeight(100); 
    } 
} public void changeOption2(AutoCompleteTextView text)
{ 
    text.setTextColor(Color.RED); 
}
}

---

Manifest file

enter code here<?xml version="1.0" encoding="utf-8"?>

<activity android:name=".AutoComplete" android:label="AutoComplete" android:launchMode="standard" android:enabled="true">

Answer 1

Chetan, I'm not quite sure what the exact problem you are having here, but I'm guessing you get a nullPointerException when you try to launch a new Activity? I didn't take an extensive look at your code but I noticed you don't have any of the extra Activities in your Manifest. Anytime you create a new Activity to be launched you need to add it to the Manifest. I'm pretty new to Android so I'm not too sure why all this is, but I came across that problem before as well.