MusicWork/main/java/com/example/musicwork/StartActivity.java

package com.example.musicwork;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.os.Handler;
import android.view.KeyEvent;

public class StartActivity extends AppCompatActivity {
    private Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 注意：此处将setContentView()方法注释掉
        // setContentView(R.layout.activity_start);
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                gotoLogin();
            }
        }, 1500);
    }

    /**
     * 前往注册、登录主页
     */
    private void gotoLogin() {
        Intent intent = new Intent(StartActivity.this, SignIn.class);
        startActivity(intent);
        finish();
        //取消界面跳转时的动画，使启动页的logo图片与注册、登录主页的logo图片完美衔接
        overridePendingTransition(0, 0);
    }

    /**
     * 屏蔽物理返回键
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    protected void onDestroy() {
        if (handler != null) {
            //If token is null, all callbacks and messages will be removed.
            handler.removeCallbacksAndMessages(null);
        }
        super.onDestroy();
    }


}