找不到类异常Android

Question

I am trying to learn android programming and I am creating an app that starts with a splash screen and loads a menu class after that. the problem is I get this exception

06-04 10:59:37.166: E/AndroidRuntime(926): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.em.example1.MENU" on path: /data/app/com.em.example1-1.apk

I understand what the exception states but I do not understand why this is happening. In my splash screen class I load the Menu activity like this

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);
    Thread timer = new Thread() {
        public void run() {
            try {
                sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                Intent mainApp = new Intent("com.em.example1.MENU");
                startActivity(mainApp);

            }
        }
    };
    timer.start();

and the menu class is defined in the manifest file like this

    <activity
        android:name="com.em.example1.MENU"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.em.example1.MENU" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

When i was loading a main activity with two buttons and a label everything was working ok. But when I changed it (inside my splash screen activity) so it would load Menu Activity it keeps giving me this error.

Thanks in advance

Answer 1

Right click on your project goto properties. Java Build Path. Choose Order export tab. Make sure that Android Private Libraries is selected. If you have referenced library project. do the same for the library project also. Clean and Build.

Answer 2

Maybe you should use this:

Intent mainApp = new Intent(this,com.em.example1.MENU.class);
startActivity(mainApp);

Answer 3

You may use this code, i have made some changes. it may be help u..

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);
    Thread timer = new Thread() {
        public void run() {
            try {
                sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                MENU.this.runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        Intent mainApp = new Intent(MENU.this,com.em.example1.MENU.class);
                        MENU.this.startActivity(mainApp);
                    }
                });


            }
        }
    };
timer.start();

Answer 4

the stuff f in manifest before what you listed is what? What you are looking for is that to seee what the app package name is..

Answer 5

Try changing this line in your manifest file.

<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>

And also try this thing

Try going to Project -> Properties -> Java Build Path -> Order & Export and ensure Android Private Libraries are checked for your project and for all other library projects you are using. Clean all projects afterwards and see what happens.

Answer 6

As it turns out I the error was too simple to realize...... I had the word Menu capitalized in Android Manifest in the name and not only in action name. Thanks for trying to help me everyone