What Should my utility class extend?

Question

Hi i am creating an external jar file and that is a library for reshaping a text view and here is the reshape class :

public class Reshaper extends Activity{
    public static Context co;

    public static void ReshapeTextview(TextView Textview, String fontpath) {
        Typeface tf = Typeface.createFromAsset(co.getAssets(), fontpath);
        Textview.setTypeface(tf);
        PersianReshape.reshape(Textview.getText().toString());
    }

and here is how i use it in other project that i have imported that jar there.

public class Main extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView tv = (TextView) findViewById(R.id.textView1);
        Reshaper.ReshapeTextview(tv, "title.TTF");

    }

but when i launch it i got a force close !

and here is the log:

11-29 19:13:48.637: E/AndroidRuntime(1218): Uncaught handler: thread main exiting due to uncaught exception
11-29 19:13:48.678: E/AndroidRuntime(1218): java.lang.NoClassDefFoundError: mr.persian.reshape.Reshaper
11-29 19:13:48.678: E/AndroidRuntime(1218):     at com.example.mm.Main.onCreate(Main.java:15)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.os.Looper.loop(Looper.java:123)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at android.app.ActivityThread.main(ActivityThread.java:4363)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at java.lang.reflect.Method.invokeNative(Native Method)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at java.lang.reflect.Method.invoke(Method.java:521)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
11-29 19:13:48.678: E/AndroidRuntime(1218):     at dalvik.system.NativeStart.main(Native Method)

Reshaper doesn't need Activity's behaviour. So do not extend anything. You have other kind of problem: VM cant find Reshaper class. — Leonidos, Nov 29 '13 at 16:01
@Leonidos I have followed this tutorial to export a jar file! http://stackoverflow.com/questions/17063826/how-to-create-jar-for-android-library-project — Like, Nov 29 '13 at 16:02
You missed something and your jar is not in your apk or it's in wrong place ) — Leonidos, Nov 29 '13 at 16:05

NG. · Answer 1 · 2013-11-29T16:05:44.720

Don't have it extend anything and accept a Context as a parameter in your static methods.

You can probably do something like:

public class Reshaper {
    public static void ReshapeTextview(TextView Textview, String fontpath) {
        Context co = Textview.getContext();
        ReshapeTextview(Textview, fontpath, co);
    }

    // If the Context returned is not the correct one, you can accept a context as a parameter:
    public static void ReshapeTextview(TextView Textview, String fontpath, Context co) {
        Typeface tf = Typeface.createFromAsset(co.getAssets(), fontpath);
        Textview.setTypeface(tf);
        PersianReshape.reshape(Textview.getText().toString());
    }
}

In terms of the error you are seeing, the comments are correct in that the class Reshaper is not found, which implies it's not in the classpath.

may you explain your answer a bit? – Like Nov 29 '13 at 16:01 — Like, Nov 29 '13 at 16:01

What Should my utility class extend?

1 Answers1