Android - NoClassDefFoundError

Question

由于下面这行代码，我得到了一个NoClassDefFoundError：

adapter = new SocialAuthAdapter(new ResponseListener());

我想这可能是我的ResponseListener()方法有问题，但我找不到它有任何问题。代码如下：

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

    // Adapter initialization
    adapter = new SocialAuthAdapter(new ResponseListener());

    listview = (ListView) findViewById(R.id.listview);
    listview.setAdapter(new CustomAdapter(this, adapter));

    // Welcome Message
    TextView textview = (TextView) findViewById(R.id.text);
    textview.setText("Use SocialAuth by creating your own UI.");
    textview.setTextColor(Color.WHITE);
    textview.setGravity(Gravity.CENTER);
    textview.setPadding(0, 30, 0, 0);
}

// To receive the response after authentication
private final class ResponseListener implements DialogListener {
    @Override
    public void onComplete(Bundle values) {
        Log.d("Custom-UI", "Successful");

        // Changing Sign In Text to Sign Out
        // Code to refresh Single ListView Item : You can remove it for your
        // app
        View v = listview.getChildAt(pos
                - listview.getFirstVisiblePosition());
        TextView pText = (TextView) v.findViewById(R.id.signstatus);
        pText.setText("Sign Out");

        // Get the provider
        final String providerName = values
                .getString(SocialAuthAdapter.PROVIDER);
        Log.d("Custom-UI", "providername = " + providerName);

        int res = getResources().getIdentifier(providerName + "_array",
                "array", CustomUI.this.getPackageName());

        AlertDialog.Builder builder = new AlertDialog.Builder(CustomUI.this);
        builder.setTitle("Select Options");
        builder.setCancelable(true);
        builder.setIcon(android.R.drawable.ic_menu_more);

        builder.setSingleChoiceItems(new ArrayAdapter<String>(
                CustomUI.this, R.layout.provider_options, getResources()
                        .getStringArray(res)), 0,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int item) {

                        Events(item, providerName);
                    }
                });
        dialog = builder.create();
        dialog.show();
    }

    @Override
    public void onError(SocialAuthError error) {
        Log.d("Custom-UI", "Error");
        error.printStackTrace();
    }

    @Override
    public void onCancel() {
        Log.d("Custom-UI", "Cancelled");
    }

    @Override
    public void onBack() {
        Log.d("Custom-UI", "Dialog Closed by pressing Back Key");

    }
}

下面是Logcat：

02-20 16:21:44.562: E/AndroidRuntime(932): FATAL EXCEPTION: main
02-20 16:21:44.562: E/AndroidRuntime(932): java.lang.NoClassDefFoundError: org.brickred.socialauth.android.SocialAuthAdapter
02-20 16:21:44.562: E/AndroidRuntime(932):  at com.socialauth.customui.CustomUI.onCreate(CustomUI.java:70)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.app.Activity.performCreate(Activity.java:5104)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.os.Looper.loop(Looper.java:137)
02-20 16:21:44.562: E/AndroidRuntime(932):  at android.app.ActivityThread.main(ActivityThread.java:5039)
02-20 16:21:44.562: E/AndroidRuntime(932):  at java.lang.reflect.Method.invokeNative(Native Method)
02-20 16:21:44.562: E/AndroidRuntime(932):  at java.lang.reflect.Method.invoke(Method.java:511)
02-20 16:21:44.562: E/AndroidRuntime(932):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
02-20 16:21:44.562: E/AndroidRuntime(932):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
02-20 16:21:44.562: E/AndroidRuntime(932):  at dalvik.system.NativeStart.main(Native Method)

任何帮助都将不胜感激。

Answer 1

此错误与DVM在运行时找不到类文件的问题有关。这意味着它不包含在您的apk文件中。

我假设包含您正在使用的SocialAuthAdapter类的jar文件包含在lib文件夹中，而不是libs文件夹中。因此，将jar文件移动到libs文件夹，然后重新编译apk文件。