Java tutorial
/* * ServeStream: A HTTP stream browser/player for Android * Copyright 2013 William Seemann * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.sourceforge.servestream.utils; import android.app.Activity; import android.app.Dialog; import android.app.ProgressDialog; import android.content.DialogInterface; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; public class LoadingDialog extends DialogFragment implements DialogInterface.OnCancelListener { private String mDialogText = null; /* The activity that creates an instance of this dialog fragment must * implement this interface in order to receive event callbacks. * Each method passes the DialogFragment in case the host needs to query it. */ public interface LoadingDialogListener { public void onLoadingDialogCancelled(DialogFragment dialog); } // Use this instance of the interface to deliver action events static LoadingDialogListener mListener; /* Call this to instantiate a new LoadingDialog. * @param activity The activity hosting the dialog, which must implement the * LoadingDialogListener to receive event callbacks. * @returns A new instance of LoadingDialog. * @throws ClassCastException if the host activity does not * implement LoadingDialogListener */ public static LoadingDialog newInstance(Activity activity, String dialogText) { // Verify that the host activity implements the callback interface try { // Instantiate the LoadingDialogListener so we can send events with it mListener = (LoadingDialogListener) activity; } catch (ClassCastException e) { // The activity doesn't implement the interface, throw exception throw new ClassCastException(activity.toString() + " must implement LoadingDialogListener"); } LoadingDialog frag = new LoadingDialog(); // Supply dialog text as an argument. Bundle args = new Bundle(); args.putString("dialog_text", dialogText); frag.setArguments(args); return frag; } /* Call this to instantiate a new LoadingDialog. * @param activity The activity hosting the dialog, which must implement the * LoadingDialogListener to receive event callbacks. * @returns A new instance of LoadingDialog. * @throws ClassCastException if the host activity does not * implement LoadingDialogListener */ public static LoadingDialog newInstance(Fragment fragment, String dialogText) { // Verify that the host activity implements the callback interface try { // Instantiate the LoadingDialogListener so we can send events with it mListener = (LoadingDialogListener) fragment; } catch (ClassCastException e) { // The activity doesn't implement the interface, throw exception throw new ClassCastException(fragment.toString() + " must implement LoadingDialogListener"); } LoadingDialog frag = new LoadingDialog(); // Supply dialog text as an argument. Bundle args = new Bundle(); args.putString("dialog_text", dialogText); frag.setArguments(args); return frag; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mDialogText = getArguments().getString("dialog_text"); } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { // Use the Builder class for convenient dialog construction ProgressDialog loadingDialog = null; loadingDialog = new ProgressDialog(getActivity()); loadingDialog.setMessage(mDialogText); loadingDialog.setCancelable(true); loadingDialog.setOnCancelListener(this); return loadingDialog; } @Override public void onDestroyView() { if (getDialog() != null) { getDialog().setDismissMessage(null); } super.onDestroyView(); } public void onCancel(DialogInterface dialog) { mListener.onLoadingDialogCancelled(LoadingDialog.this); } }