java - IncompatibleClassChangeError : interface not implemented

Question

从 android 市场，我得到以下崩溃报告。我在测试我的应用程序时没有找到。崩溃发生在 PasswordActivity 类中。我正在发送堆栈跟踪和代码。谁能告诉我崩溃发生在哪里以及为什么会发生？

堆栈跟踪

java.lang.IncompatibleClassChangeError: interface not implemented
at in.plackal.lovecyclesfree.PasswordActivity.onCreate(PasswordActivity.java)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
at dalvik.system.NativeStart.main(Native Method)

我的代码

public class PasswordActivity extends Activity implements Utilities {//私有(private)变量private EditText m_passwrdEditText;

private TextView m_passwrdErrorText;

private Resources m_res;

@Override
public void onCreate(Bundle savedInstanceState) {
    //Setup the activity
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);


    if (dm.widthPixels == 320 && dm.heightPixels == 480) {
        setContentView(R.layout.password_activity_hvga);
    } else {
        setContentView(R.layout.password_activity);
    }

    GoogleAnalyticsTracker tracker = GoogleAnalyticsTracker.getInstance();;
    tracker.startNewSession("UA-xxxxxxx-1", this);
    tracker.trackPageView("Password");
    tracker.dispatch();

    m_res = getResources();

    final Typeface face = Typeface.createFromAsset(getAssets(), "fonts/Cicle Semi.otf");

    m_passwrdErrorText = (TextView) findViewById(R.id.txt_error_message);
    m_passwrdErrorText.setTypeface(face);

    m_passwrdEditText = (EditText) findViewById(R.id.txt_edit_passwrd);
    m_passwrdEditText.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            m_passwrdEditText.setHint("");
            m_passwrdEditText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
            m_passwrdEditText.setTypeface(face);
        }
    });

    m_passwrdEditText.setTypeface(face);

    m_passwrdEditText.setOnKeyListener(new OnKeyListener() {
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
                String strPassEntered = m_passwrdEditText.getText().toString();
                String strPassSaved = CycleManager.getSingletonObject().getPassWord();
                m_passwrdEditText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
                if (strPassSaved.equals(strPassEntered) || strPassEntered.equals(DEFAULT_PASSWORD)) {
                    Intent intent = new Intent(PasswordActivity.this, ActivityManager.class);
                    startActivity(intent);
                    PasswordActivity.this.finish();
                } else {
                    m_passwrdErrorText.setText(m_res.getString(R.string.passwrd_error_text));
                    m_passwrdEditText.setFocusable(true);
                }
            } else if (keyCode == KeyEvent.KEYCODE_DEL) {
                m_passwrdEditText.setHint(m_res.getString(R.string.passwrd_hint_text));
                m_passwrdErrorText.setText("");
            }

            m_passwrdEditText.setTypeface(face);
            return false;
        }
    });
}

Answer 1

我看到 2 份关于 Play 商店的报告，IncompatibleClassChangeError: interface not implemented exception in Service class with log message containing onStartCommand(Unknown Source) .我正在使用 Eclipse 构建已发布的应用程序。

还好我室友的手机也遇到了同样的异常。通过以下链接阅读后:What causes java.lang.IncompatibleClassChangeError? ，我修复它的方法(至少在我室友的手机上)是将 android-support-v4.jar 添加到项目的“libs”文件夹并添加到构建路径。然后在“订购和导出”下的项目“Java 构建路径”部分中，导出新添加的 jar 文件并删除导出“Android 私有(private)库”的选择。