Java tutorial
/* MythDroid: Android MythTV Remote Copyright (C) 2009-2010 foobum@gmail.com This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.mythdroid.activities; import java.util.ArrayList; import java.util.HashMap; import org.mythdroid.Globals; import org.mythdroid.R; import org.mythdroid.resource.Messages; import org.mythdroid.util.DatabaseUtil; import org.mythdroid.util.ErrUtil; import org.mythdroid.util.Reflection; import org.mythdroid.views.ActionView; import android.R.drawable; import android.R.id; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.DialogInterface.OnCancelListener; import android.content.DialogInterface.OnDismissListener; import android.os.Bundle; import android.os.Handler; import android.support.v4.view.MenuItemCompat; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.AdapterView.OnItemClickListener; import android.widget.TextView; import android.view.View.OnClickListener; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; /** * Base class for activities that display frontend choosers * and/or loading dialogs - same as MDListActivity */ public abstract class MDActivity extends Activity { final static int MENU_FRONTEND = 0; /** Frontend chooser and loading dialogs */ final protected static int FRONTEND_CHOOSER = -1, DIALOG_LOAD = -2; final protected Context ctx = this; private Handler handler = new Handler(); /** * The activity we are on the way to when the frontend chooser dialog * finishes */ protected Class<?> nextActivity = null, hereActivity = null; /** Extras to put in the intent passed to nextActivity */ private Bundle bundleExtras = null; final private ArrayList<String> boolExtras = new ArrayList<String>(); final private HashMap<String, Integer> intExtras = new HashMap<String, Integer>(); final private HashMap<String, String> stringExtras = new HashMap<String, String>(); /** ActionBar Indicator for Frontend */ private TextView frontendIndicator = null; private boolean onHere = false; /** Start nextActivity when the frontend dialog chooser is finished */ protected OnDismissListener dismissListener = new OnDismissListener() { @Override public void onDismiss(DialogInterface dialog) { if ((!onHere && (Globals.curFe == null || nextActivity == null)) || (onHere && (hereActivity == null || nextActivity == null))) return; final Intent intent = new Intent().setClass(ctx, onHere ? hereActivity : nextActivity); if (bundleExtras != null) intent.putExtras(bundleExtras); for (String extra : boolExtras) intent.putExtra(extra, true); for (String extra : intExtras.keySet()) intent.putExtra(extra, intExtras.get(extra).intValue()); for (String extra : stringExtras.keySet()) intent.putExtra(extra, stringExtras.get(extra)); nextActivity = null; onHere = false; startActivity(intent); } }; /** Clear nextActivity if the frontend chooser is cancelled */ protected OnCancelListener cancelListener = new OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { nextActivity = null; } }; @Override public Dialog onCreateDialog(int id) { switch (id) { case FRONTEND_CHOOSER: final Dialog d = createFrontendDialog(); d.setOnDismissListener(dismissListener); d.setOnCancelListener(cancelListener); return d; case DIALOG_LOAD: final ProgressDialog prog = new ProgressDialog(this); prog.setIndeterminate(true); prog.setMessage(getResources().getText(R.string.loading)); prog.setCanceledOnTouchOutside(false); prog.setOnCancelListener(new OnCancelListener() { @Override public void onCancel(DialogInterface arg0) { finish(); } }); return prog; } return null; } @Override public void onPrepareDialog(int id, final Dialog dialog) { switch (id) { case FRONTEND_CHOOSER: prepareFrontendDialog(dialog); return; default: super.onPrepareDialog(id, dialog); } } @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); Reflection.setThreadPolicy(); Reflection.setActionHomeEnabled(this); } @Override public void onResume() { super.onResume(); updateFrontendIndicator(); } @Override public void onSaveInstanceState(Bundle icicle) { removeDialog(DIALOG_LOAD); super.onSaveInstanceState(icicle); } @Override public void onDestroy() { super.onDestroy(); removeDialog(FRONTEND_CHOOSER); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { Intent intent = new Intent(this, Main.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); return true; } return false; } /** Create a dialog allowing user to choose default frontend */ private Dialog createFrontendDialog() { final AlertDialog d = new AlertDialog.Builder(ctx).setItems(new String[] {}, null) .setIcon(drawable.ic_menu_upload_you_tube).setTitle(R.string.chFe).create(); d.getListView().setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> av, View v, int pos, long id) { onHere = false; String fe = (String) av.getAdapter().getItem(pos); Globals.curFe = fe; updateFrontendIndicator(); if (fe.equals(Messages.getString("MDActivity.0"))) // Here //$NON-NLS-1$ onHere = true; d.dismiss(); } }); return d; } private void prepareFrontendDialog(final Dialog dialog) { final ArrayList<String> list = DatabaseUtil.getFrontendNames(this); if (hereActivity != null || nextActivity == null) list.add(Messages.getString("MDActivity.0")); // Here //$NON-NLS-1$ if (list.isEmpty()) { ErrUtil.errDialog(ctx, dialog, R.string.noFes, FRONTEND_CHOOSER); return; } ((AlertDialog) dialog).getListView() .setAdapter(new ArrayAdapter<String>(ctx, R.layout.simple_list_item_1, id.text1, list)); } /** Show the loading dialog */ protected void showLoadingDialog() { handler.post(new Runnable() { @Override public void run() { showDialog(DIALOG_LOAD); } }); } /** Dismiss the loading dialog */ protected void dismissLoadingDialog() { handler.post(new Runnable() { @Override public void run() { try { dismissDialog(DIALOG_LOAD); } catch (IllegalArgumentException e) { } } }); } /** * Add "Here" to the frontend chooser and start the provided * activity if it's selected * @param activity the activity to start */ protected void addHereToFrontendChooser(Class<?> activity) { hereActivity = activity; } /** * Add a valueless Extra to the Intent used to start child activities * when the frontend chooser finishes * @param name String containing the name of the Extra */ protected void setExtra(String name) { boolExtras.add(name); } /** * Add an Extra with an integer value to the Intent used to start child * activities when the frontend chooser finishes * @param name String containing the name of the Extra * @param value integer value for the Extra */ protected void setExtra(String name, int value) { intExtras.put(name, value); } /** * Add an Extra with an String value to the Intent used to start child * activities when the frontend chooser finishes * @param name String containing the name of the Extra * @param value String value for the Extra */ protected void setExtra(String name, String value) { stringExtras.put(name, value); } /** * Add an Bundle of Extras to the Intent used to start child * activities when the frontend chooser finishes * @param extras Bundle of extras */ protected void setExtras(Bundle extras) { bundleExtras = extras; } /** * Add a frontend chooser to the options menu (or action bar on >= 3.0) * @param menu menu to add to */ protected void addFrontendChooser(Menu menu) { final MenuItem item = menu.add(Menu.NONE, MENU_FRONTEND, Menu.NONE, R.string.setCurFe) .setIcon(drawable.ic_menu_upload_you_tube); if (MenuItemCompat.setShowAsAction(item, MenuItemCompat.SHOW_AS_ACTION_ALWAYS)) { ActionView vi = (ActionView) LayoutInflater.from(this).inflate(R.layout.frontend_indicator, null); vi.setFocusable(true); vi.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { nextActivity = null; showDialog(FRONTEND_CHOOSER); } }); frontendIndicator = (TextView) vi.findViewById(R.id.actionItemText); updateFrontendIndicator(); MenuItemCompat.setActionView(item, vi); } } private void updateFrontendIndicator() { if (frontendIndicator == null) return; if (Globals.curFe != null) frontendIndicator.setText(Globals.curFe); else frontendIndicator.setText(R.string.none); } }