4.5. Building the MainActivity Class

Figures 4.17–4.27 implement the Twitter Searches app’s logic in the class MainActivity, which extends ListActivity. The default code for class MainActivity included an onCreateOptionsMenu method, which we removed because it’s not used in this app—we’ll discuss onCreateOptionsMenu in Chapter 5. Throughout this section, we assume that you create the necessary String resources as you encounter them in the code descriptions.

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 1   // MainActivity.java
 2   // Manages your favorite Twitter searches for easy
 3   // access and display in the device's web browser
 4   package com.deitel.twittersearches;
 5
 6   import java.util.ArrayList;
 7   import java.util.Collections;
 8
 9   import android.app.AlertDialog;
10   import android.app.ListActivity;
11   import android.content.Context;
12   import android.content.DialogInterface;
13   import android.content.Intent;
14   import android.content.SharedPreferences;
15   import android.net.Uri;
16   import android.os.Bundle;
17   import android.view.View;
18   import android.view.View.OnClickListener;
19   import android.view.inputmethod.InputMethodManager;
20   import android.widget.AdapterView;
21   import android.widget.AdapterView.OnItemClickListener;
22   import android.widget.AdapterView.OnItemLongClickListener;
23   import android.widget.ArrayAdapter;
24   import android.widget.EditText;
25   import android.widget.ImageButton;
26   import android.widget.TextView;
27

Fig. 4.17 | MainActivity’s package and import statements.