的原因

Question

我是Android编程的新手，但似乎我找不到我的错误我需要你的帮助

每次我登录并点击按钮btnLogin app停止。

登录类

public class DocLogin extends Fragment {

ImageView ivIcon;
TextView tvItemName, tvRegister;
EditText user, pass;
Button btnLogin;
SQLController dbcon;
SessionManager session;

public DocLogin() {

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.doc_log_in, container, false);

    session = new SessionManager(getActivity());

    dbcon = new SQLController(getActivity());
    dbcon.open();

    // Log in
    user = (EditText) view.findViewById(R.id.etUser);
    pass = (EditText) view.findViewById(R.id.etPassword);
    btnLogin = (Button) view.findViewById(R.id.btnLogin);

    // Sign up
    tvRegister = (TextView) view.findViewById(R.id.tvRegDoc);
    tvRegister.setMovementMethod(LinkMovementMethod.getInstance());
    tvRegister.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            FragmentManager fm = getFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            ft.replace(R.id.content_frame, new DocReg());
            ft.commit();
            return false;
        }
    });

    // btnLogin onClickListener
    btnLogin.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View view) {
            // TODO Auto-generated method stub

            dbcon = new SQLController(getActivity());
            dbcon.open();


            Log.v("LoginDetails", user.getText().toString() + "../.."
                    + pass.getText().toString());
            Cursor cur = dbcon.getuser_information(user.getText()
                    .toString(), pass.getText().toString());
            if (cur.getCount() != 0) {
                FragmentManager fm = getFragmentManager();
                FragmentTransaction ft = fm.beginTransaction();
                ft.replace(R.id.content_frame, new DocProfile());
                ft.commit();
            } else {
                AlertDialog alertDialog = new AlertDialog.Builder(
                        getActivity()).create();
                alertDialog.setTitle("Login Error");
                alertDialog
                        .setMessage("Doctor Code and Password does not match");
                alertDialog.setButton("OK",
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                // TODO Auto-generated method stub
                                // dismiss dialog
                            }
                        });
                alertDialog.show();
            }

        }
    });

    return view;
}

}

这是我得到的错误

06-23 14:11:16.483: E/Trace(4864): error opening trace file: No such file or directory (2)
06-23 14:11:27.783: E/AndroidRuntime(4864): FATAL EXCEPTION: main
06-23 14:11:27.783: E/AndroidRuntime(4864): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.droid/com.droid.DocLogin}; have you declared this activity in your AndroidManifest.xml?
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1541)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1416)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.Activity.startActivityForResult(Activity.java:3351)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.Activity.startActivityForResult(Activity.java:3312)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.Activity.startActivity(Activity.java:3522)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.Activity.startActivity(Activity.java:3490)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at com.droid.SessionManager.checkLogin(SessionManager.java:41)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at com.droid.DocProfile.onCreateView(DocProfile.java:43)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:829)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.BackStackRecord.run(BackStackRecord.java:635)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.os.Handler.handleCallback(Handler.java:615)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.os.Looper.loop(Looper.java:137)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at android.app.ActivityThread.main(ActivityThread.java:4745)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at java.lang.reflect.Method.invokeNative(Native Method)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at java.lang.reflect.Method.invoke(Method.java:511)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-23 14:11:27.783: E/AndroidRuntime(4864):     at dalvik.system.NativeStart.main(Native Method)

但在DocLogin

中声明AndroidManifest课程后

这是错误

06-23 14:09:53.463: E/AndroidRuntime(4791): FATAL EXCEPTION: main
06-23 14:09:53.463: E/AndroidRuntime(4791): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.droid/com.droid.DocLogin}: java.lang.ClassCastException: com.droid.DocLogin cannot be cast to android.app.Activity
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.os.Looper.loop(Looper.java:137)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.app.ActivityThread.main(ActivityThread.java:4745)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at java.lang.reflect.Method.invokeNative(Native Method)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at java.lang.reflect.Method.invoke(Method.java:511)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at dalvik.system.NativeStart.main(Native Method)
06-23 14:09:53.463: E/AndroidRuntime(4791): Caused by: java.lang.ClassCastException: com.droid.DocLogin cannot be cast to android.app.Activity
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
06-23 14:09:53.463: E/AndroidRuntime(4791):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
06-23 14:09:53.463: E/AndroidRuntime(4791):     ... 11 more

有关于此的任何想法吗？

Answer 1

DocLogin片段不是Activity。

将DocLogin Fragment添加到Activity，然后在Activity文件中声明AndroidManifest.xml

Answer 2

显示ActivityNotFound异常，因为它无法找到所述活动。而不是您创建的类，创建相同的Android Activity并在Android Manifest中声明它。

Answer 3

ActivitynotFound异常是因为AndroidManifest.xml文件中没有活动声明。

我认为您的Activity类是DocProfile。确保它扩展FragmentActivity并将DocLogin片段添加到DocProfile Activty。

Answer 4

DocLogin不会扩展活动。所以删除片段并扩展活动

如果您希望DocLogin扩展片段，则再创建一个活动，并将视图添加到由DocLogin返回的活动，如下所示。

公共类MainActivity扩展了Activity {

DocLogin doclogin;

//In oncreate
 doclogin = new DocLogin();
 setcontentview(doclogin);

}

请在AndroidManifest.xml中添加您的活动。

如果您想进行新活动，请在AndroidManifest.xml中注册。

Answer 5

正如您的logcat所说：

 android.content.ActivityNotFoundException: Unable to find explicit activity class 
{com.droid/com.droid.DocLogin}; have you declared this activity in your AndroidManifest.xml?

的原因

你没有在清单文件中声明com.droid.DocLogin。

在清单中声明此活动将删除此异常。

//你还得到一个例外：

java.lang.ClassCastException: com.droid.DocLogin cannot be cast to android.app.Activity

这是因为 DocLogin 是一个片段而不是一个活动，你也可以使用getactivity（）作为片段的上下文。

Android获取错误ActivityNotFoundException

5 个答案:

的原因