AndriodStudio按钮实现页面跳转（2）

代码部分：

activity_welcome.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/ba"
    tools:context=".Welcome">

    <include layout="@layout/top" />
    <FrameLayout
        android:id="@+id/id_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">

    </FrameLayout>

    <include layout="@layout/bottom" />
    <TextView
        android:id="@+id/mainword"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center"
        android:textSize="22dp"
        tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>

Ishouye.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/ba"
    tools:context=".Shouye">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
    <Button
        android:id="@+id/button2"
        android:layout_width="184dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="370dp"
        android:layout_weight="1"
        android:background="#00000000"
        android:textSize="25dp"
        android:text="开始学习" />
    </RelativeLayout>
</LinearLayout>

Welcome.java

package com.example.buxiedaima;

import androidx.appcompat.app.AppCompatActivity;

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

public class Welcome extends AppCompatActivity {
    SharedPreferences sp;
    TextView showhello;


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

        ImageButton imageButton3 = null;
        ImageButton imageButton4 = null;

        imageButton3 = (ImageButton) findViewById(R.id.imageButton3);
        imageButton4 = (ImageButton) findViewById(R.id.imageButton4);
        imageButton3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.setClass(Welcome.this,Shouye.class);
                startActivity(intent);
            }
        });
        imageButton4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.setClass(Welcome.this,Wode.class);
                startActivity(intent);
            }
        });


    }


}

Shouye.java

package com.example.buxiedaima;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class Shouye extends AppCompatActivity {

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

AndroidManifest.java

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.buxiedaima">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat.NoActionBar">

        <activity
            android:name=".Welcome"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Shouye"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>