Android – No Class Def Found Error (android)

android

I am developing an application and I can start my Launcher activity which has two buttons. When any of these buttons is clicked a new activity should be opened. However, then a runtime error occurs.


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class Intro extends Activity {

    Button searchBut, fbButton;

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AppSettings.loadLogin(getApplicationContext());
        setContentView(R.layout.intro);
        if (AppSettings.logged) {
            Intent a = new Intent(Intro.this, AllChallengesPager.class);
            a.putExtra("logging", "0");
            startActivity(a);
        }
        searchBut = (Button) findViewById(R.id.button2);
        searchBut.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent a = new Intent(Intro.this, DetailedChallenge.class);
                a.putExtra("logging", "0");
                startActivity(a);
            }
        });
        fbButton = (Button) findViewById(R.id.fbBut);
        fbButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent a = new Intent(Intro.this, AllChallengesPager.class);
                a.putExtra("logging", "1");
                startActivity(a);
            }
        });
        AppSettings.loadLogin(getApplicationContext());
    }
}

06-07 11:26:07.776: E/AndroidRuntime(13305): FATAL EXCEPTION: main
06-07 11:26:07.776: E/AndroidRuntime(13305): java.lang.NoClassDefFoundError: com.loopj.android.http.RequestParams
06-07 11:26:07.776: E/AndroidRuntime(13305):    at com.example.challengeZygio.DetailedChallenge.onCreate(DetailedChallenge.java:216)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.app.Activity.performCreate(Activity.java:5047)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2056)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2117)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.app.ActivityThread.access$700(ActivityThread.java:134)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1218)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.os.Looper.loop(Looper.java:137)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at android.app.ActivityThread.main(ActivityThread.java:4867)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at java.lang.reflect.Method.invokeNative(Native Method)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at java.lang.reflect.Method.invoke(Method.java:511)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
06-07 11:26:07.776: E/AndroidRuntime(13305):    at dalvik.system.NativeStart.main(Native Method)

– All my jar libraries are placed in libs folder
– I have cleaned the project and restarted Eclipse for several times
– I am using Eclipse Juno with all the newest updates

Best Solution

Right click your Project -> Properties -> Java Build Path -> Order & Export

After reaching here, libraries what you have used, "select" those libraries and move them to top of list. i.e suppose you have used "xyz.jar" file then following will be your sequence.

[x] xyz.jar
[x] Android x.x
[x] Android Dependencies ....

Save changes and rebuild your project after cleaning it.