ActivityNotFoundException Android应用程序

Question

Total noob here in the programming world and I'm just trying to figure out, why when I click on a button for a login screen on my app, it just won't run and it shuts down "unexpectedly" in the emulator.

Here's the code:

    package com.lania.saludandroidte;


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

import android.widget.TextView;

public class LoginActivity extends Activity implements View.OnClickListener{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);

        Button log = (Button) findViewById(R.id.btnLogin);
        log.setOnClickListener((OnClickListener) this);

        TextView registerScreen = (TextView) findViewById(R.id.link_to_register);

        // Listening to register new account link
        registerScreen.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // Switching to Register screen


                Intent i = new Intent(getApplicationContext(), RegisterActivity.class);
                startActivity(i);
            }
        });
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if (v.getId() == R.id.btnLogin) {
            startActivity(new Intent(LoginActivity.this, Menu.class));
        }
    }



}

Here's the log:

This is what I get:

    05-06 13:07:05.155: E/AndroidRuntime(277): FATAL EXCEPTION: main
05-06 13:07:05.155: E/AndroidRuntime(277): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.lania.saludandroidte/com.lania.saludandroidte.Menu}; have you declared this activity in your AndroidManifest.xml?
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1404)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1378)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.app.Activity.startActivityForResult(Activity.java:2817)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.app.Activity.startActivity(Activity.java:2923)
05-06 13:07:05.155: E/AndroidRuntime(277):  at com.lania.saludandroidte.LoginActivity.onClick(LoginActivity.java:41)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.view.View.performClick(View.java:2408)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.view.View$PerformClick.run(View.java:8816)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.os.Handler.handleCallback(Handler.java:587)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.os.Handler.dispatchMessage(Handler.java:92)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.os.Looper.loop(Looper.java:123)
05-06 13:07:05.155: E/AndroidRuntime(277):  at android.app.ActivityThread.main(ActivityThread.java:4627)
05-06 13:07:05.155: E/AndroidRuntime(277):  at java.lang.reflect.Method.invokeNative(Native Method)
05-06 13:07:05.155: E/AndroidRuntime(277):  at java.lang.reflect.Method.invoke(Method.java:521)
05-06 13:07:05.155: E/AndroidRuntime(277):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-06 13:07:05.155: E/AndroidRuntime(277):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-06 13:07:05.155: E/AndroidRuntime(277):  at dalvik.system.NativeStart.main(Native Method)

Manifest file:

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lania.saludandroidte"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name= "com.lania.saludandroidte.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


        <activity
            android:name="com.lania.saludandroidte.Glucosa"
            android:label="@string/title_activity_glucosa" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity
            android:name="com.lania.saludandroidte.LoginActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name="com.sanikte.proyecto.Menu" />
        <activity android:name="com.sanikte.proyecto.RegisterActivity" />
    </application>

</manifest>

Answer 1

Change this in your AndroidManifest.xml:

 <activity android:name="com.sanikte.proyecto.Menu" />

to this:

 <activity android:name="com.lania.saludandroidte.Menu" />

You have declared it with the wrong package. You can tell this because in your LoginActivity.java where you say Menu.class it is not qualified with the full package and if you look at the import list it is not imported under com.sanikte.proyecto therefore Menu.java must be in the same package as LoginActivity.java

Answer 2

您需要在Manifest中声明新活动。

<activity android:name="com.lania.saludandroidte.RegisterActivity" /> 

Answer 3

It's telling you that you need to add the com.lania.saludandroidte.Menu Activity. It appears that you have registered com.sanikte.proyecto.Menu , but its package "com.sanikte.proyecto" does not match the actual Activity's package, "com.lania.saludandroidte".