default package choosing strategy

plugins/android/src/org/jetbrains/android/newProject/AndroidAppPropertiesEditor.form

@@ -51,7 +51,7 @@
               </grid>
             </constraints>
             <properties>
-              <text value="com.example"/>
+              <text value=""/>
             </properties>
           </component>
           <component id="9ff82" class="javax.swing.JCheckBox" binding="myHelloAndroidCheckBox">

plugins/android/src/org/jetbrains/android/newProject/AndroidAppPropertiesEditor.java

@@ -45,11 +45,11 @@ public class AndroidAppPropertiesEditor {
   private JLabel myErrorLabel;
   private JPanel myContentPanel;
 
-  private final String myModuleName;
-
   public AndroidAppPropertiesEditor(String moduleName) {
-    myModuleName = moduleName;
-    myApplicationNameField.setText(moduleName);
+    if (moduleName != null) {
+      myApplicationNameField.setText(moduleName);
+      myPackageNameField.setText(getDefaultPackageNameByModuleName(moduleName));
+    }
     myHelloAndroidCheckBox.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
         updateActivityPanel();
@@ -71,6 +71,31 @@ public class AndroidAppPropertiesEditor {
     });
   }
 
+  @NotNull
+  public static String getDefaultPackageNameByModuleName(@NotNull String moduleName) {
+    return "com.example." + toIdentifier(moduleName);
+  }
+
+  @NotNull
+  private static String toIdentifier(@NotNull String s) {
+    final StringBuilder result = new StringBuilder();
+
+    for (int i = 0, n = s.length(); i < n; i++) {
+      final char c = s.charAt(i);
+
+      if (Character.isJavaIdentifierPart(c)) {
+        if (i == 0 && !Character.isJavaIdentifierStart(c)) {
+          result.append('_');
+        }
+        result.append(c);
+      }
+      else {
+        result.append('_');
+      }
+    }
+    return result.toString();
+  }
+
   public void updateActivityPanel() {
     myErrorLabel.setForeground(Color.RED);
     UIUtil.setEnabled(myActivtiyPanel, myHelloAndroidCheckBox.isSelected(), true);
@@ -155,6 +180,10 @@ public class AndroidAppPropertiesEditor {
     return myApplicationNameField;
   }
 
+  public JTextField getPackageNameField() {
+    return myPackageNameField;
+  }
+
   public JPanel getActivtiyPanel() {
     return myActivtiyPanel;
   }

plugins/android/src/org/jetbrains/android/newProject/AndroidModuleWizardStep.java

@@ -241,8 +241,12 @@ public class AndroidModuleWizardStep extends ModuleWizardStep {
   }
 
   public JComponent getComponent() {
-    myAppPropertiesEditor.getApplicationNameField().setText(myModuleBuilder.getName());
+    final String moduleName = myModuleBuilder.getName();
 
+    if (moduleName != null) {
+      myAppPropertiesEditor.getApplicationNameField().setText(moduleName);
+      myAppPropertiesEditor.getPackageNameField().setText(AndroidAppPropertiesEditor.getDefaultPackageNameByModuleName(moduleName));
+    }
     Sdk selectedSdk = mySdkComboBoxWithBrowseButton.getSelectedSdk();
     final PropertiesComponent properties = PropertiesComponent.getInstance();