更新至版本1

new file:   src/net/micode/notes/ui/WelcomePageActivity.java

src/net/micode/notes/ui/WelcomePageActivity.java

@@ -0,0 +1,42 @@
+package net.micode.notes.ui;
+
+import android.annotation.SuppressLint;
+
+import android.content.Intent;
+
+import android.support.v7.app.ActionBar;
+
+import android.support.v7.app.AppCompatActivity;
+
+import android.os.Build;
+
+import android.os.Bundle;
+
+import android.os.Handler;
+
+import android.view.MotionEvent;
+
+import android.view.View;
+
+import android.view.WindowInsets;
+
+import net.micode.notes.R;
+
+public class WelcomePageActivity extends AppCompatActivity {
+    Handler mHandler=new Handler();
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState); //加载启动界面
+        setContentView(R.layout.activity_welcome_page); //加载启动图片
+        // 当计时结束时，跳转至NotesListActivity
+        mHandler.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                Intent intent=new Intent();
+                intent.setClass(WelcomePageActivity.this, NotesListActivity.class);
+                startActivity(intent);
+                finish(); //销毁欢迎页面
+            }
+        }, 2000); // 2 秒后跳转
+    }
+}