Question

in order to refactor my code, I’m moving some methods I’m using in every project to an Android library.

Eg. I’ve created a simple library project with the following class:

public class HttpUtils {

    public boolean isNetworkAvailable(Context context) {
        ConnectivityManager cm = (ConnectivityManager) 
          context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.isConnected()) {
            return true;
        }
        return false;
    } 
}

and the following (default) manifest file:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.xxx.utils"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

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

</manifest>

I can import it in another Android project using

import com.xxx.utils.http.HttpUtils;

but if I try using HttpUtils.isNetworkAvailable, I get HttpUtils.isNetworkAvailable cannot be resolved to a type.

I read that, for a library activity, it should be added to the manifest file, but how can I add a simple class, like my HttpUtils, in the library manifest to be able to access its method from another project?

Answer 1

Why would you like to add this class like a library. Add it just in your package, then you can call it from any Activity like that :

boolean isNetworkAvailable = new HttpUtils().isNetworkAvailable(this);

Or make isNetworkAvailable static :

public static boolean isNetworkAvailable(Context context) {....}

Then you could call it simply:

boolean isNetworkAvailable = HttpUtils.isNetworkAvailable(this);

In this way, there is nothing to declare in the manifest file.

EDIT :
ok, I understand. You have several projects. So for this, you have 2 choices :

1)you can create from eclipse new project and in the second window select “Mark this project as a library”. Then in all your project add this library project in the build path

2)create a jar file