【发布时间】：2011-06-09 16:34:18
【问题描述】：
我正在学习 Android（具有讽刺意味的是，来自 Google 和 SO 的开发者网站的交叉），但我在早期步骤中遇到了麻烦。我要参加的活动顺序是： 1.加载启动页面 2. 5秒后（这是暂时的……最终会被用来掩盖加载时间），切换到主视图 3. 在主视图加载时，弹出一个 nag 窗口（当前为 alertDialog），为用户提供两个按钮按下选项
除了一个问题外，我所有这些都正常工作。当启动页面出现时（应用程序启动时），nag 窗口会立即弹出。您可以在 nag 窗口下方看到启动页面运行良好，它会等待 5 秒，然后切换到主页面。有人可以告诉我我做错了什么，就试图让 nag 窗口在启动页面计数完成之前不弹出？主java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;
}
}
【问题讨论】：
标签： java android user-interface mobile