Android简单实现启动画面的方法

package com.demo.app;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
public class SplashActivity extends Activity {
  private final int SPLASH_DISPLAY_LENGHT = 6000; // 延迟六秒
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);
    new Handler().postDelayed(new Runnable() {
      public void run() {
        Intent mainIntent = new Intent(SplashActivity.this,
            HelloWorldActivity.class);
        SplashActivity.this.startActivity(mainIntent);
        SplashActivity.this.finish();
      }
    }, SPLASH_DISPLAY_LENGHT);
  }
}

// 立即执行Runnable对象
public final boolean post(Runnable r);
// 在指定的时间（uptimeMillis）执行Runnable对象
public final boolean postAtTime(Runnable r, long uptimeMillis);
// 在指定的时间间隔（delayMillis）执行Runnable对象
public final boolean postDelayed(Runnable r, long delayMillis);

SplashActivity.this.startActivity(mainIntent);
SplashActivity.this.finish();