java - Android 编程新手，尝试创建导致登录屏幕的登录按钮。当我单击登录按钮时，应用程序显示 "stopped working"

Question

登录按钮所在的主页 Activity

package com.example.james.assignment1_18094969;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;
import android.content.Intent;

public class Home extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        //findview for the login button 
        findViewById(R.id.button_login).setOnClickListener(new login());
    }

onClickListener 用于单击登录按钮并将用户带到登录页面。

    class login implements OnClickListener {
        public void onClick(View v) {
            Intent intent = new Intent(Home.this, login.class);
            startActivity(intent);
        }
    }
}

登录屏幕:

package com.example.james.assignment1_18094969;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class Login extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
    }
}

Answer 1

尝试此操作并请确认 list 中声明了登录 Activity

    package com.example.james.assignment1_18094969;

    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View.OnClickListener;
    import android.view.View;
    import android.content.Intent;

    public class Home extends AppCompatActivity implements View.OnClickListener {

        Button Login;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_home);
            Login=findViewById(R.id.button_login);
            login.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            Intent intent = new Intent(Home.this, Login.class);
            startActivity(intent);
        } 
}