小编Joh*_*zcz的帖子

我有一个非常基本但很烦人的问题。我创建了新活动并将意图传递给他们。然而，当我传达两者：MainMenu 和 EventCreationActivity 时，我收到以下错误：

android.content.ActivityNotFoundException：无法找到显式活动类{/com.mysampleapp.EventCreationActivity}；您是否在 AndroidManifest.xml 中声明了此活动？

当我单独运行这些活动时，它们工作得很好。这是主菜单的代码

   package com.mysampleapp;


import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;

//import com.amazon.mysampleapp.R;

public class MainMenu extends AppCompatActivity {
    //public final static String EXTRA_MESSAGE = "com.mysampleapp.MESSAGE";
    final Intent intent = new Intent(this, EventCreationActivity.class);
    Button newEvent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_menu);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        newEvent = (Button) findViewById(R.id.new_event_button);

        newEvent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(intent); …