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延迟进入主界面的功能，主要用到Handler和Runnable，代码如下：
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package?com.zx.app;import?android.app.Activity;import?android.content.Intent;import?android.os.Bundle;import?android.os.Handler;import?android.view.View;import?android.widget.Button;public?class?StartScreenActivity?extends?Activity?{?private?final?int?SPLASH_DISPLAY_LENGHT?=?3000;?//?3秒启动界面延迟?private?Button?btn;?@Override?protected?void?onCreate(Bundle?savedInstanceState)?{??//?TODO?Auto-generated?method?stub??super.onCreate(savedInstanceState);??setContentView(R.layout.splash);??btn?=?(Button)?this.findViewById(R.id.enter);??//创建一个线程??final?Runnable?myRun?=?new?Runnable()?{???@Override???public?void?run()?{????//?TODO?Auto-generated?method?stub????Intent?intent?=?new?Intent(StartScreenActivity.this,??????MainActivity.class);????startActivity(intent);????finish();???}??};??final?Handler?handler?=?new?Handler();??//使用handler对象来定时启动线程运行??handler.postDelayed(myRun,?SPLASH_DISPLAY_LENGHT);???//直接点击跳过?延迟加载进入主界面?btn.setOnClickListener(new?View.OnClickListener()?{???@Override???public?void?onClick(View?v)?{????//?TODO?Auto-generated?method?stub????//移除handler延迟加载里面的线程，就不会存在执行两次的情况????handler.removeCallbacks(myRun);????Intent?intent?=?new?Intent(StartScreenActivity.this,??????MainActivity.class);????startActivity(intent);????finish();???}??});?}}?
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