title: android [ java.lang.NoClassDefFoundError: android.widget.Toolbar ]
body: <p>I created a tool bar in my list view activity. I used the following code for this:</p>
  
  <pre><code>public class Home extends ListActivity {
  
      private ProgressDialog pDialog;
  
      // URL to get contacts JSON
      private static String url = "http://api-11hr.anovatesoft.com/v1/list";
  
      // JSON Node names
      private static final String TAG_CONTACTS = "contacts";
      private static final String TAG_USERNAME = "username";
      private static final String TAG_NAME = "name";
      private static final String TAG_EMAIL = "email";
      private static final String TAG_ADDRESS = "address";
      private static final String TAG_CONTACT_NUMBER = "contactnumber";
      private static final String TAG_POSTAL_CODE = "postalcode";
      private static final String TAG_IMAGE = "image";
      SessionManager session;
      private double latitude;
      private double longitude;
      private String apikey;
      private String status;
      GPSTracker gps;
  
      private Toolbar toolbar;                              // Declaring the Toolbar Object
  
      // contacts JSONArray
      JSONArray contacts = null;
  
      // Hashmap for ListView
      ArrayList&lt;HashMap&lt;String, String&gt;&gt; contactList;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.home);
  
          toolbar = (Toolbar) findViewById(R.id.tool_bar); // Attaching the layout to the toolbar object
          setActionBar(toolbar);                   // Setting toolbar as the ActionBar with setSupportActionBar() call
  
          // get action bar
        /*  ActionBar actionBar = getActionBar();
          getActionBar().setHomeButtonEnabled(true);
          actionBar.setDisplayHomeAsUpEnabled(true);*/
  
  
  
          AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(
                  Home.this);
  
  // Setting Dialog Title
          alertDialog2.setTitle("Too quiet?");
  
  // Setting Dialog Message
          alertDialog2.setMessage("Follow your favourite merchants and see what deals they're launching at the 11th Hour!");
  
  
  
  // Setting Positive "Yes" Btn
          alertDialog2.setPositiveButton("YES",
                  new DialogInterface.OnClickListener() {
                      public void onClick(DialogInterface dialog, int which) {
                          // Write your code here to execute after dialog
  
                          dialog.cancel();
  
                      }
                  });
  
          alertDialog2.show();
  
  
          Gps_func();
  
  
          // Session class instance
          session = new SessionManager(getApplicationContext());
  
          // get user data from session
          HashMap&lt;String, String&gt; user = session.getUserDetails();
  
  
          // apikey
          // Calling Application class (see application tag in AndroidManifest.xml)
          final GlobalClass globalVariable = (GlobalClass) getApplicationContext();
  
          //Set name and email in global/application context
          apikey = globalVariable.getApikey();
  
  
          latitude = globalVariable.getLatitude();
          longitude = globalVariable.getLongitude();
          status = globalVariable.getStatus();
  
  
  
          contactList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;();
  
          ListView lv = getListView();
  
          // Listview on item click listener
          lv.setOnItemClickListener(new OnItemClickListener() {
  
              @Override
              public void onItemClick(AdapterView&lt;?&gt; parent, View view,
                                      int position, long id) {
                  // getting values from selected ListItem
  
                  String cost = ((TextView) view.findViewById(R.id.email))
                          .getText().toString();
  
  
                  // Starting single contact activity
                  Intent in = new Intent(getApplicationContext(),
                          Adds.class);
  
                  in.putExtra(TAG_EMAIL, cost);
  
                  startActivity(in);
  
              }
          });
  
          // Calling async task to get json
          new GetContacts().execute();
      }
  
      private void Gps_func() {
  
          gps = new GPSTracker(Home.this);
  
          // check if GPS enabled
          if (gps.canGetLocation()) {
  
              double latitude = gps.getLatitude();
              double longitude = gps.getLongitude();
  
              // \n is for new line
              //  Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
              Log.d("tag", "Longitude:\n" + longitude + "\n Latitude: \n" + latitude);
  
          } else {
              // can't get location
              // GPS or Network is not enabled
              // Ask user to enable GPS/network in settings
              gps.showSettingsAlert();
  
              if (gps.canGetLocation()) {
                  double latitude = gps.getLatitude();
                  double longitude = gps.getLongitude();
  
                  // \n is for new line
                  // Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
                  Log.d("tag", "Longitude:\n" + longitude + "\n Latitude: \n" + latitude);
  
              }
          }
  
      }
  
  
      @Override
      protected void onRestart() {
          super.onRestart();
          Gps_func();
      }
  
  
  
      /**
       * Async task class to get json by making HTTP call
       */
      private class GetContacts extends AsyncTask&lt;Void, Void, Void&gt; {
  
          @Override
          protected void onPreExecute() {
              super.onPreExecute();
              // Showing progress dialog
              pDialog = new ProgressDialog(Home.this);
              pDialog.setMessage("Please wait....");
              pDialog.setCancelable(false);
              pDialog.show();
  
          }
  
          @Override
          protected Void doInBackground(Void... arg0) {
              // Creating service handler class instance
              ServiceHandler1 sh = new ServiceHandler1(apikey, latitude, longitude);
  
  
              // Making a request to url and getting response
              String jsonStr = sh.makeServiceCall(url, ServiceHandler1.POST);
  
              Log.d("Response: ", "&gt; " + jsonStr);
  
  
              if (jsonStr != null) {
                  try {
                      JSONObject jsonObj = new JSONObject(jsonStr);
  
                      // Getting JSON Array node
                      contacts = jsonObj.getJSONArray(TAG_CONTACTS);
  
                      // looping through All Contacts
                      for (int i = 0; i &lt; contacts.length(); i++) {
                          JSONObject c = contacts.getJSONObject(i);
  
                          String username = c.getString(TAG_USERNAME);
                          String name = c.getString(TAG_NAME);
                          String email = c.getString(TAG_EMAIL);
                          String address = c.getString(TAG_ADDRESS);
                          String gender = c.getString(TAG_CONTACT_NUMBER);
                          String postalcode = c.getString(TAG_POSTAL_CODE);
  
  
                          // tmp hashmap for single contact
                          HashMap&lt;String, String&gt; contact = new HashMap&lt;String, String&gt;();
  
                          // adding each child node to HashMap key =&gt; value
  
                          contact.put(TAG_EMAIL, email);
  
  
                          // adding contact to contact list
                          contactList.add(contact);
                      }
                  } catch (JSONException e) {
                      e.printStackTrace();
                  }
              } else {
                  Log.e("ServiceHandler", "Couldn't get any data from the url");
              }
  
              return null;
          }
  
  
          @Override
          protected void onPostExecute(Void result) {
              super.onPostExecute(result);
              // Dismiss the progress dialog
              if (pDialog.isShowing())
                  pDialog.dismiss();
              /**
               * Updating parsed JSON data into ListView
               * */
              ListAdapter adapter = new SimpleAdapter(
                      Home.this, contactList,
                      R.layout.list_item1, new String[]{TAG_EMAIL,
              }, new int[]{
                      R.id.email,});
  
              setListAdapter(adapter);
          }
  
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
  
          //noinspection SimplifiableIfStatement
          if (id == R.id.action_settings) {
              return true;
          }
  
          return super.onOptionsItemSelected(item);
      }
  }
  </code></pre>
  
  <p>but when I run the application it give an error: </p>
  
  <blockquote>
    <p>java.lang.NoClassDefFoundError: android.widget.Toolbar</p>
  </blockquote>
  
  <p>please help me out for getting a tool bar</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 22
      buildToolsVersion "22.0.1"
  
  
  
      defaultConfig {
          applicationId "com.example.kmi_dev.fbloginsample"
          minSdkVersion 11
          targetSdkVersion 22
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  repositories {
      mavenCentral()
  }
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      compile 'com.android.support:appcompat-v7:22.2.0'
      compile 'com.facebook.android:facebook-android-sdk:4.1.0'
  }
  </code></pre>
  
  <p>tool_bar.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@color/ColorPrimary"
      android:theme="@style/ThemeOverlay.AppCompat.Dark"
      android:elevation="4dp"
  
      &gt;
  
  &lt;/android.support.v7.widget.Toolbar&gt;
  </code></pre>
  
  <p>list layout including tool_bar.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:orientation="vertical"&gt;
      &lt;!-- Main ListView
           Always give id value as list(@android:id/list)
  
  
      --&gt;
      &lt;include
          android:id="@+id/tool_bar"
          layout="@layout/tool_bar"
          &gt;&lt;/include&gt;
      &lt;ListView
          android:id="@android:id/list"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"/&gt;
  
  
  &lt;/LinearLayout&gt;
  </code></pre>