activity_main

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
    tools:context="com.bawei.huoshan_lss.MainActivity">

    <ImageView
        android:id="@+id/welcom"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@mipmap/sy"
        />

</android.support.constraint.ConstraintLayout
 
>

MainActivity

public class MainActivity extends AppCompatActivity {
int time=3;
Handler handler;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        handler = new Handler();
        handler.postDelayed(new
 
 Runnable() {
            @Override
            public void run() {
              time--;
              if(time==0){
                  /*新建一個要跳轉到的頁面*/
                  Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                  startActivity(intent);
                  return;
              }
                handler.postDelayed(this,1000);
            }
        },1000);
    }
}