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public class HomeActivity extends Activity {

	public static final int DIALOG_IMPORTING_WORDLIST = 0;

	class WordlistInstall extends AsyncTask<Void, String, Void> {
		private BufferedReader mInput;
		private String mLine;
		private WordsDbAdapter mDbAdapter;

		@Override
		protected void onPreExecute() {
			super.onPreExecute();

			showDialog(DIALOG_IMPORTING_WORDLIST);

...

		}

		@Override
		protected Void doInBackground(Void... unused) {
			try {

...

			} catch (IOException e) {
...
			}

			return null;
		}

		@Override
		protected void onPostExecute(Void unused) {
			dismissDialog(DIALOG_IMPORTING_WORDLIST);
		}
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		new WordlistInstall().execute();
	}

	@Override
	protected Dialog onCreateDialog(int id) {
		switch (id) {
			case DIALOG_IMPORTING_WORDLIST:
				ProgressDialog mProgressDialog;
				mProgressDialog = new ProgressDialog(this);
				mProgressDialog.setMessage("Importing list...");
				mProgressDialog.setCancelable(false);
				mProgressDialog.show();
				return mProgressDialog;
			default:
				return null;
		}
	}
}