title: Android problems when import library project using Eclipse
body: <p>So, I tried to add <code>v7 appcompat</code> support library with resource to <code>MyFirstApp</code> project, by following the tutorial @</p>
  
  <p><a href="http://developer.android.com/tools/support-library/setup.html" rel="nofollow">http://developer.android.com/tools/support-library/setup.html</a></p>
  
  <p>Both <code>android-support-v4.jar</code> and <code>android-support-v7-appcompat.jar</code> files were exported. Eclipse includes the <code>android-support-v4.jar</code> by default and when I tried the code:</p>
  
  <pre><code>// MainActivity.java
  import android.support.v7.app.ActionBarActivity;// error
  
  public class MainActivity extends ActionBarActivity {...} // error
  
  // DisplayMessageActivity.java
  import android.support.v4.app.NavUtils; // error on this line
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.display_message, menu);// error at R
      return true;
  }
  
  public boolean onOptionsItemSelected(MenuItem item) {
      switch (item.getItemId()) {
      case android.R.id.home:
          // This ID represents the Home or Up button. In the case of this
          // activity, the Up button is shown. Use NavUtils to allow users
          // to navigate up one level in the application structure. For
          // more details, see the Navigation pattern on Android Design:
          //
          // http://developer.android.com/design/patterns/navigation.html#up-vs-back
          //
          NavUtils.navigateUpFromSameTask(this);// error at NavUtils
          return true;
      }
      return super.onOptionsItemSelected(item);
  }
  </code></pre>
  
  <p>I got a number of errors:</p>
  
  <pre><code>The import android.support cannot be resolved   MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 4  Java Problem
  The method onCreate(Bundle) of type MainActivity must override or implement a supertype method  MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 16 Java Problem
  ActionBarActivity cannot be resolved to a type  MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 12 Java Problem
  R cannot be resolved to a variable  MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 18 Java Problem
  ActionBarActivity cannot be resolved to a type  MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 17 Java Problem
  The method onCreateOptionsMenu(Menu) of type MainActivity must override or implement a supertype method MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 23 Java Problem
  The import android.support cannot be resolved   DisplayMessageActivity.java /MyFirstApp/src/com/example/myfirstapp  line 9  Java Problem
  R cannot be resolved to a variable  DisplayMessageActivity.java /MyFirstApp/src/com/example/myfirstapp  line 51 Java Problem
  The method getMenuInflater() is undefined for the type MainActivity MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 25 Java Problem
  R cannot be resolved to a variable  MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 25 Java Problem
  The constructor Intent(MainActivity, Class&lt;DisplayMessageActivity&gt;) is undefined    MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 30 Java Problem
  R cannot be resolved to a variable  MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 31 Java Problem
  The method startActivity(Intent) is undefined for the type MainActivity MainActivity.java   /MyFirstApp/src/com/example/myfirstapp  line 34 Java Problem
  Jar mismatch! Fix your dependencies MyFirstApp      Unknown Android Dependency Problem
  NavUtils cannot be resolved DisplayMessageActivity.java /MyFirstApp/src/com/example/myfirstapp  line 66 Java Problem
  </code></pre>
  
  <p>When I added the library <code>android-support-v7-appcompat</code> to <code>MyFirstApp</code>, and <code>apply</code>, I got the following errors:</p>
  
  <pre><code>[2014-01-23 18:31:52 - MyFirstApp] Found 2 versions of android-support-v4.jar in the    dependency list,
  [2014-01-23 18:31:52 - MyFirstApp] but not all the versions are identical (check is based on SHA-1 only at this time).
  [2014-01-23 18:31:52 - MyFirstApp] All versions of the libraries must be the same at this time.
  [2014-01-23 18:31:52 - MyFirstApp] Versions found are:
  [2014-01-23 18:31:52 - MyFirstApp] Path: C:\Users\daiyue\Google Drive\MyFirstApp\libs\android-support-v4.jar
  [2014-01-23 18:31:52 - MyFirstApp]  Length: 621451
  [2014-01-23 18:31:52 - MyFirstApp]  SHA-1: 5896b0a4e377ac4242eb2bc785220c1c4fc052f4
  [2014-01-23 18:31:52 - MyFirstApp] Path: C:\Program Files (x86)\Android\android-sdk\extras\android\support\v7\appcompat\libs\android-support-v4.jar
  [2014-01-23 18:31:52 - MyFirstApp]  Length: 627582
  [2014-01-23 18:31:52 - MyFirstApp]  SHA-1: db0f122c99ef9f90dbab3fada6d191f2880cbb8e
  [2014-01-23 18:31:52 - MyFirstApp] Jar mismatch! Fix your dependencies
  [2014-01-23 18:31:53 - MyFirstApp] W/ResourceType( 8160): ResXMLTree_node header size 0 is too small.
  [2014-01-23 18:31:53 - MyFirstApp] C:\Users\daiyue\Google Drive\MyFirstApp\res\values\desktop.ini:1: error: Error parsing XML: syntax error
  [2014-01-23 18:31:53 - MyFirstApp] C:\Users\daiyue\Google Drive\MyFirstApp\res\values-v11\desktop.ini:1: error: Error parsing XML: syntax error
  [2014-01-23 18:31:53 - MyFirstApp] C:\Users\daiyue\Google Drive\MyFirstApp\res\values-v14\desktop.ini:1: error: Error parsing XML: syntax error
  [2014-01-23 18:31:53 - MyFirstApp] C:\Users\daiyue\Google Drive\MyFirstApp\res\values-sw600dp\desktop.ini:1: error: Error parsing XML: syntax error
  [2014-01-23 18:31:53 - MyFirstApp] C:\Users\daiyue\Google Drive\MyFirstApp\res\values-sw720dp-land\desktop.ini:1: error: Error parsing XML: syntax error
  [2014-01-23 18:31:53 - MyFirstApp] C:\Users\daiyue\Google Drive\MyFirstApp\res\layout\desktop.ini:1: error: Error parsing XML: syntax error
  [2014-01-23 18:31:53 - MyFirstApp] C:\Users\daiyue\Google Drive\MyFirstApp\res\menu\desktop.ini:1: error: Error parsing XML: syntax error
  </code></pre>