我正在学习Android(具有讽刺意味的是,它来自Google和SO的跨开发者网站),但我在迈出第一步时遇到了麻烦。我要进行的事件的顺序是:
1.加载初始页面
2. 5秒钟后(这是暂时的...最终将被用来掩盖加载时间),切换到主视图
3.在主视图加载中,弹出一个导航窗口(当前为alertDialog),该窗口为用户提供了两个按钮按下选项

除了一个问题,我已经全部工作了。当启动页面出现时(应用启动时),nag窗口立即弹出。您可以看到启动页面在nag窗口下运行良好,等待5秒钟,然后切换到main。有人可以告诉我我正在做错什么,直到尝试在启动页面计数完成之前不弹出导航窗口? Java主页面粘贴在下面:

public class MyProject extends Activity {

    protected Dialog mSplashDialog;
    private static final int NAG_BOX = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        MyStateSaver data = (MyStateSaver) getLastNonConfigurationInstance();
        if (data != null) {
            // Show splash screen if still loading
            if (data.showSplashScreen) {
                showSplashScreen();
            }
            setContentView(R.layout.main);
            showDialog(NAG_BOX);

            // Rebuild your UI with your saved state here
        } else {
            showSplashScreen();
            setContentView(R.layout.main);
            // Do your heavy loading here

        }
    }

    @Override
    public Object onRetainNonConfigurationInstance() {
        MyStateSaver data = new MyStateSaver();
        // Save your important data here

        if (mSplashDialog != null) {
            data.showSplashScreen = true;
            removeSplashScreen();
        }
        return data;
    }

    /**
     * Removes the Dialog that displays the splash screen
     */
    protected void removeSplashScreen() {
        if (mSplashDialog != null) {
            mSplashDialog.dismiss();
            mSplashDialog = null;
        }
    }

    /**
     * Shows the splash screen over the full Activity
     */
    protected void showSplashScreen() {
        mSplashDialog = new Dialog(this, R.style.SplashScreen);
        mSplashDialog.setContentView(R.layout.splash);
        mSplashDialog.setCancelable(false);
        mSplashDialog.show();

        // Set Runnable to remove splash screen just in case
        final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
          @Override
          public void run() {
            removeSplashScreen();
          }
        }, 5000);
    }

    /**
     * Simple class for storing important data across config changes
     */
    private class MyStateSaver {
        public boolean showSplashScreen = false;
        // Your other important fields here
    }

     @Override
        protected Dialog onCreateDialog(int id) {
            switch (id) {

            case NAG_BOX:
                // This example shows how to add a custom layout to an AlertDialog
                LayoutInflater factory = LayoutInflater.from(this);
                final View textEntryView = factory.inflate(R.layout.nagbox, null);
                return new AlertDialog.Builder(MyProject.this)
                    .setView(textEntryView)
                    .setNegativeButton("Maybe Later", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                           dismissDialog(NAG_BOX);
                        }
                    })
                    .setPositiveButton("Go To Site", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {

                            Uri url = Uri.parse("http://www.google.com");
                            Intent intent = new Intent(Intent.ACTION_VIEW, url);
                            startActivity(intent);
                        }
                    })

                    .create();
            }
            return null;
        }
}

最佳答案

关闭启动画面后,为什么不调用showDialog(NAG_BOX)?

protected void removeSplashScreen() {
    if (mSplashDialog != null) {
        mSplashDialog.dismiss();
        mSplashDialog = null;
        showDialog(NAG_BOX);
    }
}

09-10 09:06
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