I think you could wrap ensureCookieManager() with a runtime check for API level 
and @Suppress the compiler warning. Patch welcome.

Patch with API level check.

Thanks, @versluyssander. I modified it to wrap the call to 
ensureCookieManager() in order to make it more clear that there is no 
CookieManager for API<9. Also made note on issue 7 since this was the dup.

Please release a version with this patch

I moved the fix into AnroidHttpClient as a result of issue 12. It's available 
in basic-http-client-android-0.88.jar in the Downloads section.

 i use the basic-http-client-android-0.88.jar version, and with android 2.2 work (the output is ok) even if I get the warning
( Could not find method 
com.turbomanage.httpclient.android.AndroidHttpClient.ensureCookieManager, 
referenced from method com.turbomanage.httpclient.android.AndroidHttpClient. 
VFY: unable to resolve static method 3169: 
Lcom/turbomanage/httpclient/android/AndroidHttpClient;.ensureCookieManager 
()V), but with android 2.3+ i have this error:

03-23 11:31:59.344: E/AndroidRuntime(780): FATAL EXCEPTION: main
03-23 11:31:59.344: E/AndroidRuntime(780): java.lang.ExceptionInInitializerError
03-23 11:31:59.344: E/AndroidRuntime(780): at 
com.example.helloworld.MainActivity.onCreate(MainActivity.java:32)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.app.Activity.performCreate(Activity.java:5104)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.app.ActivityThread.access$600(ActivityThread.java:141)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.os.Handler.dispatchMessage(Handler.java:99)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.os.Looper.loop(Looper.java:137)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
android.app.ActivityThread.main(ActivityThread.java:5041)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
java.lang.reflect.Method.invokeNative(Native Method)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
java.lang.reflect.Method.invoke(Method.java:511)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-23 11:31:59.344: E/AndroidRuntime(780): at 
dalvik.system.NativeStart.main(Native Method)
03-23 11:31:59.344: E/AndroidRuntime(780): Caused by: 
java.lang.NoSuchMethodError: 
com.turbomanage.httpclient.android.AndroidHttpClient.ensureCookieManager
03-23 11:31:59.344: E/AndroidRuntime(780): at 
com.turbomanage.httpclient.android.AndroidHttpClient.(AndroidHttpClient.java:49)
03-23 11:31:59.344: E/AndroidRuntime(780): … 15 more

java.lang.NoSuchMethodError and not class not found.
AndroidHttpClient.java:49
static {
disableConnectionReuseIfNecessary();
// See http://code.google.com/p/basic-http-client/issues/detail?id=8
if (Build.VERSION.SDK_INT > 8)
ensureCookieManager();
}

I do not understand, it would find the method ensureCookieManager() in 
com.turbomanage.httpclient.android.AndroidHttpClient class?
tnk

I can't reproduce this. Are you using ProGuard?

package com.example.helloworld;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import com.turbomanage.httpclient.AsyncCallback;
import com.turbomanage.httpclient.HttpResponse;
import com.turbomanage.httpclient.ParameterMap;
import com.turbomanage.httpclient.android.AndroidHttpClient;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends Activity {

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

        AndroidHttpClient httpClient = new AndroidHttpClient("http://10.0.2.2/cmp");
        httpClient.setMaxRetries(5);
        ParameterMap params = null;
        httpClient.get("/states", params, new AsyncCallback() {
            @Override
            public void onComplete(HttpResponse httpResponse) {
                System.out.println(httpResponse.getBodyAsString());
            }
            @Override
            public void onError(Exception e) {
                e.printStackTrace();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

i'm newbie with android prog., i tried to use a simple helloworld with your 
httpclient

androidmanifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.helloworld"
    android:versionCode="1"
    android:versionName="1.0" android:installLocation="preferExternal">

    <uses-sdk 
        android:minSdkVersion="8" 
        android:targetSdkVersion="21" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:allowBackup="true"
        android:theme="@style/AppTheme" android:allowClearUserData="true">
        <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>

project.properties:

# This file is automatically generated by Android Tools.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
#
# This file must be checked in Version Control Systems.
#
# To customize properties used by the Ant build system edit
# "ant.properties", and override values to adapt the script to your
# project structure.
#
# To enable ProGuard to shrink and obfuscate your code, uncomment this 
(available properties: sdk.dir, user.home):
#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project
.txt

# Project target.
target=android-17

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />

</RelativeLayout>

avd android 4.2.2 or 4.1