新建一个Activity.java(或者ther->Android Activity)

public class OpenActivity extends Activity {
     @Override
      protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //隐藏标题栏以及状态栏
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
        /**标题是属于View的，所以窗口所有的修饰部分被隐藏后标题依然有效,需要去掉标题**/
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_open);
        handler.sendEmptyMessageDelayed(0,3000);
      }
     
      private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
          getHome();
          super.handleMessage(msg);
        }
      };
     
      public void getHome(){
        Intent intent = new Intent(OpenActivity.this, MainActivity.class);
        startActivity(intent);
        finish();
      }
    }

再建一个Activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:orientation="vertical"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
 
  <ImageView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:id="@+id/imageView"
      android:layout_gravity="center_horizontal"
      android:src="@drawable/tm_s"/>
      <!--android src属性指定imageView里面要显示的资源文件的来源路径，也就是在欢迎界面显示的图片，在这里我已经预先上传了一张图片了-->
</LinearLayout>

清单文件改一下

 <activity
            android:name=".OpenActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_open" >
        </activity>

三个延迟跳转

准备工作一张图片

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="@drawable/splash"
    tools:context=".SplashActivity">

</RelativeLayout>

java开始画面类写

package com.lin.mr.mystudy;

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

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

public class SplashActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);

        //方法一：开启一个子线程执行跳转任务
//        new Thread(){
//            @Override
//            public void run() {
//                super.run();
//                try {
//                    Thread.sleep(2000);
//                    Intent intent = new Intent(SplashActivity.this,HomeActivity.class);
//                    startActivity(intent);
//                } catch (InterruptedException e) {
//                    e.printStackTrace();
//                }
//            }
//        }.start();

        //方法二：使用Handler发送延迟消息
//        new Handler(new Handler.Callback() {
//            @Override
//            public boolean handleMessage(Message msg) {
//                Intent intent = new Intent(SplashActivity.this,HomeActivity.class);
//                startActivity(intent);
//                return false;
//            }
//        }).sendEmptyMessageDelayed(0,2000);

        //方法三：使用Java计时器
        Timer timer = new Timer();
        timer.schedule(new MyTask(),2000);//定时器延时执行任务的方法
    }

    //方法三：使用Java计时器
    class MyTask extends TimerTask{
        @Override
        public void run() {
            Intent intent = new Intent(SplashActivity.this,HomeActivity.class);
            startActivity(intent);
        }
    }
}