为什么无法进入下一界面？

Question

在输入账号密码后登录和重置两个按钮都不起作用

 

 

代码如下：

mainactivity。java

package com.easybooks.myapplication15;

import android.content.Intent;
import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.os.Handler;
import android.view.View;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private EditText myName;                        //“用户名”输入框
    private EditText myPwd;                            //“密码”输入框
    private Button myOk;                           //“登录”按钮
    private TimePicker myTime;                      //时间控件
    private DatePicker myDate;                      //日期控件

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

    private void findViews() {
        myName = findViewById(R.id.myTextName);
        myPwd = findViewById(R.id.myTextPwd);
        myOk = findViewById(R.id.myButtonOk);
        myTime = findViewById(R.id.myTimePicker);
        myDate = findViewById(R.id.myDatePicker);
        myTime.setIs24HourView(true);
    }

    public void onLoginClick(View view) {
        String name = myName.getText().toString();             //获得用户名
        String pass = myPwd.getText().toString();              //获得密码
        int year, month, day, hour, minute;
        year = myDate.getYear();                        //获得日期中的年
        month = myDate.getMonth() + 1;                //获得日期中的月
        day = myDate.getDayOfMonth();                 //获得日期中的日
        hour = myTime.getCurrentHour();                   //获得日期中的时
        minute = myTime.getCurrentMinute();                   //获得日期中的分
        //（a）定义Intent数据传递机制
        Intent intent = new Intent(this, MainActivity2.class);
        Bundle bundle = new Bundle();                    //定义Bundle对象bundle
        bundle.putString("name", name);                      //字符串name内容绑定到bundle
        bundle.putString("pass", pass);
        bundle.putInt("year", year);
        bundle.putInt("month", month);
        bundle.putInt("day", day);
        bundle.putInt("hour", hour);
        bundle.putInt("minute", minute);
        intent.putExtras(bundle);                       //bundle放入Intent传输机制
        //（b）启动欢迎页面的Activity
        //startActivity(intent);
        startActivityForResult(intent, 200);
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == 101) Toast.makeText(this, "重新登录", Toast.LENGTH_LONG).show();
        else if (resultCode == 404) {
            Toast.makeText(this, "此前输入" + data.getStringExtra("pass") + "密码错！\n请重输", Toast.LENGTH_LONG).show();
            myPwd.setText("");                                //清空密码框
        }
    }
}

 

mainactivity2.java

package com.easybooks.myapplication15;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity2 extends AppCompatActivity {
    private TextView myWelcome;                   //文本视图（显示欢迎信息）
    private TextView myTime;                  //文本视图（显示登录时间）
    private String name, pass;                   //存储登录页传来的用户名密码
    private int resultCode;                      //响应码:登录成功101; 错误404

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);            //设置显示页面为welcome.xml
        findViews();
        showWelcome();
    }

    private void findViews() {
        myWelcome = findViewById(R.id.myLabelWelcome);
        myTime = findViewById(R.id.myLabelTime);
    }

    private void showWelcome() {
        Bundle bundle = getIntent().getExtras();         //定义Bundle对象bundle
        name = bundle.getString("name");            //从bundle中得到name内容（输入的用户名）
        pass = bundle.getString("pass");               //从bundle中得到pass内容（输入的密码）
        if (pass.equals("123456")) {               //验证密码
            myWelcome.setText("\n" + name + " 您好！\n    欢迎光临");
            int year, month, day, hour, minute;          //显示欢迎信息
            year = bundle.getInt("year");
            month = bundle.getInt("month");
            day = bundle.getInt("day");
            hour = bundle.getInt("hour");
            minute = bundle.getInt("minute");
            myTime.setText("登录时间：" + year + "-" + month + "-" + day + " " + hour + ":" + minute);
            resultCode = 101;                 //显示登录时间,返回成功码101
        } else {
            myWelcome.setText("密码错！");
            resultCode = 404;                 //返回错误码404
        }
        //这里定义的Intent机制是为了向登录页面返回响应码及处理的结果
        Intent data = new Intent(this, MainActivity.class);
        data.putExtras(bundle);
        setResult(resultCode, data);
    }

    public void onBackClick(View view) {
        finish();                          //结束当前Activity，回到前一个Activity
    }
}

 

Answer 1

你应该是照demo写的，xml布局里有绑定点击方法，你肯定漏了，在点击的View里有onclick属性，写上这个方法