一、先上效果图

二、创建Welcome欢迎页（Activity类型）

WelcomeActivity.java

package com.example.newwelcome;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

import java.util.Timer;
import java.util.TimerTask;

public class WelcomeActivity extends AppCompatActivity {

    //欢迎页时钟声明
    private final Timer timer = new Timer();
    private int recLen = 5;
    private TextView tv;

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

        //去除标题栏
        if (getSupportActionBar() != null) {
            getSupportActionBar().hide();
        }

        //设置欢迎页图片
        FrameLayout vi = findViewById(R.id.welcomeLayout);
        vi.setBackgroundResource(R.drawable.welcome_test);

        //欢迎页倒计时点击
        tv = findViewById(R.id.tv);
        tv.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                timer.cancel();
                tv.setVisibility(View.GONE);//倒计时到0隐藏字体
                into();
            }
        });

        //欢迎页倒计时控制
        timer.schedule(task, 1000, 1000);

    }

    //欢迎页事件
    TimerTask task = new TimerTask() {
        @Override
        public void run() {
            runOnUiThread(new Runnable() { // UI thread
                @SuppressLint("SetTextI18n")
                @Override
                public void run() {
                    recLen--;
                    tv.setText(recLen + "跳过 ");
                    if (recLen <= 0) {
                        timer.cancel();
                        tv.setVisibility(View.GONE);//倒计时到0隐藏字体
                        into();
                    }
                }
            });
        }
    };

    //进入主页
    private void into() {
        Intent intent1 = new Intent(WelcomeActivity.this, MainActivity.class);
        startActivity(intent1);
        WelcomeActivity.this.finish();
    }

}

三、修改类Welcome欢迎页xml

activity_welcome.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:id="@+id/welcomeLayout"
             android:background="#fff">

    <LinearLayout
            android:layout_marginTop="30sp"
            android:layout_marginRight="20sp"
            android:layout_width="70dp"
            android:layout_height="30sp"
            android:layout_gravity="right"
            android:orientation="horizontal"
            tools:ignore="RtlHardcoded,UselessParent">
        <TextView
                android:id="@+id/tv"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="center"
                android:gravity="center"
                android:text="5跳过"
                android:textColor="#ffffff"
                android:background="@drawable/welcome_round_time"/>
    </LinearLayout>
</FrameLayout>

四、创建控件圆角化xml文件

welcome_round_time.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:tools="http://schemas.android.com/tools"
       xmlns:android="http://schemas.android.com/apk/res/android"
       tools:ignore="MissingDefaultResource">
    <solid android:color="#37384a"/>
    <corners android:radius="15dp"/>
    <padding
            android:left="5dp"
            android:top="5dp"
            android:right="5dp"
            android:bottom="5dp"/>
</shape>

五、添加欢迎页图片

请添加图片到drawable目录中

六、修改AndroidManifest.xml文件

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

    <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/AppTheme">
        <activity
                android:name=".WelcomeActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity">
        </activity>
    </application>

</manifest>

第一次接触android 以上都是来源网络，进行整理测试。