Hello Masters!
I'd like to ask for some help: In my app, I have only one activity, a
PreferenceActivity (don't need other, it's just a simple background-
sync app, so the PrefsActivity is the Main/Launcher). After the user
setup preferences, checks a checkBoxPreference, and that starts (or
stops) a service. At starting, a dialog shows. But here is the
problem: if the user press back (leave the activity), start it again,
and than tries to check the checkBoxPref., the prefsactivity crashes.
Dialog doesn't shows. I have no idea why, and how to fix it.
This code like this below, (this is exsactly same with that part, what
gives me the problem):
PrefsActivity.java:
package is.it.works;
// imports .....
public class PrefsActivity extends PreferenceActivity implements
OnSharedPreferenceChangeListener { SharedPreferences prefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
prefs = PreferenceManager.getDefaultSharedPreferences(this);
prefs.registerOnSharedPreferenceChangeListener(this);
}// onCreate
@Override
public void onSharedPreferenceChanged(SharedPreferences preferences,
String key) {
if (key.equals("checkTest")) {
showDialog(1);
}
if (key.equals("cancel")) {
dismissDialog(1);
}
}// onSPC
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case 1: {
ProgressDialog dialog = new ProgressDialog(this);
dialog.setMessage("press back twice, start the app again, and
click checkbox...");
dialog.setIndeterminate(true);
dialog.setCancelable(true);
dialog.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
prefs.edit().putBoolean("cancel", false).commit();
}
});
return dialog;
}// case
}// switch
return null;
}// onCreateDialog
}// PrefsActivity
the prefs.xml contains just a simple checkBoxPref:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/
android">
<CheckBoxPreference android:key="checkTest" android:title="test" /
>
</PreferenceScreen>
and the mainfest is simple too:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android";
package="is.it.works" android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<application android:icon="@drawable/icon" android:label="@string/
app_name">
<activity android:name=".PrefsActivity" android:label="@string/
app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" /
>
</intent-filter>
</activity>
</application>
</manifest>
But when I run this code, got an error when leave-restart the activity
- and checking the box:
09-14 10:34:34.472: ERROR/AndroidRuntime(281): Uncaught handler:
thread main exiting due to uncaught exception
09-14 10:34:34.502: ERROR/AndroidRuntime(281):
android.view.WindowManager$BadTokenException: Unable to add window --
token android.os.BinderProxy@43756de8 is not valid; is your activity
running?
This error comes from the "new ProgressDialog(this)" operation.
Changeing "this" to "getApplicationContext()", or "PrefsActivity.this"
doesnt help, the problem is still on. It's a very simple code, but I
can't figure out what is wrong with it (?maybe nothing, than why
crases and what could be the solution?)...
I'm stucked, and now I have no idea...
Please, tell me why is it happens, and what could be the solution!
Thank You Very Much!
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