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最简单的方法就是开启一个线程，让线程睡眠三秒，还设置中间没隔开一秒页面时间变化一下

public class Before_first extends AppCompatActivity {    private final static int SHOW_RESPONSE=1;    private Handler handler=new Handler(){        public void handleMessage(Message msg){            switch (msg.what){                case SHOW_RESPONSE:                    Intent intent=new Intent(Before_first.this,FirstPage.class);                    startActivity(intent);                    finish();            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.before_first);        sendRequest();    }    private void sendRequest(){        new Thread(new Runnable() {            @Override            public void run() {                try {                    Thread.sleep(3000);                }catch (Exception e){                    e.printStackTrace();                }                Message message=new Message();                message.what=SHOW_RESPONSE;                handler.sendMessage(message);            }        }).start();    }

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