问题
....
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
done = true;
}
...
public class addcontacts extends ListActivity {
protected void onCreate() {
}
protected void execute(final Boolean success) {
if (done) {
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listItems);
setListAdapter(adapter);
}
}
}
public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
@Override
protected Boolean doInBackground(Void... params) {
...
}
@Override
protected void onPostExecute(final Boolean success) {
setContentView(R.layout.main);
ac = new addcontacts();
ac.execute(true);
}
...
public class getcontacts extends AsyncTask<Void, Void, Boolean> {
@Override
protected Boolean doInBackground(Void... params) {
...
listItems.add(json_data.getString("login") + " " + derp);
...
}
...
}
@Override
protected void onPostExecute(final Boolean success) {
getc = null;
//showProgress(false);
adapter.notifyDataSetChanged();
}
Runtime error:
02-12 15:59:35.274: E/AndroidRuntime(1308): FATAL EXCEPTION: main
02-12 15:59:35.274: E/AndroidRuntime(1308): java.lang.IllegalStateException: System services not available to Activities before onCreate()
02-12 15:59:35.274: E/AndroidRuntime(1308): at android.app.Activity.getSystemService(Activity.java:3989)
02-12 15:59:35.274: E/AndroidRuntime(1308): at android.widget.ArrayAdapter.init(ArrayAdapter.java:310)
02-12 15:59:35.274: E/AndroidRuntime(1308): at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:153)
Any ideas how to fix it?
回答1:
The only thing that is broken is your code. Fix would be to avoid access to system services prior onCreate() is completed otherwise there's no setup made yet to the activity object, hence the self-explaining-the-cause exception you facing.
来源：https://stackoverflow.com/questions/14836898/android-system-services-not-available-to-activities-before-oncreate