JMStyle

          MimeTypeMap mtm = MimeTypeMap.getSingleton(); // mime type 추출용

      // 파일의 이름을 제외한 확장자명 추출
          String fileExtension = str.substring(str.lastIndexOf(".") + 1, str.length()).toLowerCase();           

     //확장자를 통해 String 형태로 Mime타입 추출
          String mimeType = mtm.getMimeTypeFromExtension(fileExtension);

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.hjm.shear.test"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>

         </activity>
    </application>

</manifest>

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);