在线直播系统源码，Android页面跳转，intent

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?><br><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"<br>    xmlns:app="http://schemas.android.com/apk/res-auto"<br>    xmlns:tools="http://schemas.android.com/tools"<br>    android:layout_width="match_parent"<br>    android:layout_height="match_parent"<br>    tools:context=".SecondActivity"<br>    android:orientation="vertical"><br>    <TextView<br>        android:id="@+id/tv2"<br>        android:layout_width="match_parent"<br>        android:layout_height="wrap_content"<br>        android:textSize="30sp"<br>        android:text="2"/><br>    <Button<br>        android:onClick="back"<br>        android:layout_width="wrap_content"<br>        android:layout_height="wrap_content"<br>        android:textSize="30sp"<br>        android:text="返回"/><br></LinearLayout>

MainActivity.java

package cn.itcast.zuoye;<br> <br>import androidx.appcompat.app.AppCompatActivity;<br> <br>import android.content.Intent;<br>import android.os.Bundle;<br>import android.view.View;<br>import android.widget.Button;<br>import android.widget.EditText;<br>import android.widget.RadioButton;<br>import android.widget.RadioGroup;<br>import android.widget.TextView;<br>import android.widget.CheckBox;<br>import android.widget.CompoundButton;<br> <br>public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {<br>    TextView textView;<br>    EditText uname;<br>    EditText psw;<br>    RadioGroup sex;<br>    String sexcheck;<br>    String hobbys;<br>    @Override<br>    protected void onCreate(Bundle savedInstanceState) {<br>        super.onCreate(savedInstanceState);<br>        setContentView(R.layout.activity_main);<br>        System.out.println("activtiy=========>onCreate");<br>        uname = findViewById(R.id.uname);<br>        psw = findViewById(R.id.psw);<br>        sex =findViewById(R.id.sex);<br>        //初始化CheckBox控件<br>        CheckBox like1 = findViewById(R.id.like1);<br>        CheckBox like2 = findViewById(R.id.like2);<br>        CheckBox like3 = findViewById(R.id.like3);<br>        like1.setOnCheckedChangeListener(this);<br>        like2.setOnCheckedChangeListener(this);<br>        like3.setOnCheckedChangeListener(this);<br>        hobbys = new String();//存放选中的Checkbox的文本<br>        //给性别单选框设置监听事件判断选择的性别<br>        sex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {<br>            @Override<br>            public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {<br>                if(checkedId == R.id.woman){<br>                    sexcheck = "女";<br>                } else {<br>                    sexcheck = "男";<br>                }<br>            }<br>        });<br>    }<br>    @Override<br>    protected void onStart() {<br>        System.out.println("activtiy=========>onStart");<br>        super.onStart();<br>    }<br>    @Override<br>    protected void onResume() {<br>        System.out.println("activtiy=========>onResume获取焦点时候调用");<br>        super.onResume();<br> <br>    }<br>    @Override<br>    protected void onPause() {<br>        System.out.println("activtiy=========>onPause失去焦点时候调用,也就是离开软件时调用");<br>        super.onPause();<br>    }<br>    @Override<br>    protected void onStop() {<br>        System.out.println("activtiy=========>onStop");<br>        super.onStop();<br> <br>    }<br>    @Override<br>    protected void onRestart() {<br>        System.out.println("activtiy=========>onRestart");<br>        super.onRestart();<br>    }<br>    @Override<br>    protected void onDestroy() {<br>        System.out.println("activtiy=========>onDestroy，停用软件时调用");<br>        super.onDestroy();<br>    }<br>    //显示调用<br>    public  void  toActivity(View view){<br>        String userName = uname.getText().toString();<br>        Intent intent = new Intent();//声明意图<br>        intent.putExtra("userName",userName);//把值放在了intent里面<br>        User user = new User();<br>        user.setUserName(userName);<br>        intent.putExtra("user",user);<br>        intent.setClass(MainActivity.this,SecondActivity.class);//从什么地方跳转到那里去<br>        startActivity(intent);//启动意图<br>    }<br>    //隐式调用<br>    public void toActivity2(View view){<br>        Intent intent = new Intent();<br>        intent.setAction("cn.itcast.zuoye");<br>        String userName = uname.getText().toString();<br>        String passWord = psw.getText().toString();<br>//        intent.putExtra("传递数据的名称","传递的数据信息");<br>        intent.putExtra("userName",userName);//把值放在了intent里面<br>        intent.putExtra("passWord",passWord);<br>        intent.putExtra("sex",sexcheck);<br>        intent.putExtra("hobbys",hobbys);<br>        startActivityForResult(intent,1);<br>        System.out.println("调用了隐式");<br>    }<br>    //确认多选框选中的内容参见书本59页<br>    @Override<br>    public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {//第一个参数：被点击的控件 第二个参数：选中状态<br>            String motion = compoundButton.getText().toString();<br>            if(isChecked){<br>                if(!hobbys.contains(motion)){<br>                    hobbys = hobbys + motion;<br>                }else {<br>                    if(hobbys.contains(motion)){<br>                        hobbys = hobbys.replace(motion, "");<br>                    }<br>                }<br>            }<br>    }<br>} 