java - 显示来自onCreate的 Activity

问题描述

我的应用程序MainActivity和BannerActivity中有两个活动。从主要活动中，我在BannerActivity方法中启动onCreate。但是我首先看到MainActivity屏幕，然后再看到BannerActivity屏幕。

题

我该怎么做才能使BannerActivity首先显示，并且倒数计时器将停止，并且BannerActivity将在MainActivity出现在屏幕后关闭。

主要活动

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    /* Show banner activity for several seconds then close it. */
    Intent bannerIntent = new Intent(MainActivity.this, BannerActivity.class);
    this.startActivity(bannerIntent);
}
};

BannerActivity

public class BannerActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    /* Make banner fullscreen. */
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                         WindowManager.LayoutParams.FLAG_FULLSCREEN);

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_banner);

    /* Launch count down timer for several seconds. */
    CountDownTimer countDownTimer = new CountDownTimer(3000, 1000) {

        @Override
        public void onTick(long millisUntilFinished) { /* Not used. */ }

        @Override
        public void onFinish() {
            BannerActivity.this.finish();
        }

    }.start();

}

@Override
public void onBackPressed() {
    /* Lock back button presses. */
    super.onBackPressed();
}

};

最佳答案

您需要一个SplashScreen：

http://www.thiagorosa.com.br/en/tutorial/part01-splash-screen

public class GameSplash extends Activity {

// time to wait on the splash screen
private static final int SPLASH_SCREEN_DELAY = 3000;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);

    new Thread() {
        @Override
        public void run() {
            try {
                // do any heavy initialization here

                // wait a few seconds before going to the next screen
                sleep(SPLASH_SCREEN_DELAY);
            }
            catch (InterruptedException e) {

            }
            catch (Exception e) {

            }
            finally {
                // start the level selection screen
                Intent intentSelect = new Intent(GameSplash.this, GameSelect.class);
                startActivity(intentSelect);
            }
        }
    }.start();

}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    // ignore any key press on the splash screen
    return true;
}

}