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<supports-screens
        android:largeScreens="true"
        android:normalScreens="false"
        android:requiresSmallestWidthDp="600"
        android:smallScreens="false"
        android:xlargeScreens="true" />

 <uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="14" />

Add this android:screenOrientation="landscape" to your <activity> tag in the manifest for the specific activity that you want to be in landscape.

public String getIMEI(Context context){

    TelephonyManager mngr = (TelephonyManager) context.getSystemService(context.TELEPHONY_SERVICE); 
    String imei = mngr.getDeviceId();
    return imei;

}