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.activity; import net.sourceforge.servestream.R; import net.sourceforge.servestream.adapter.NavigationDrawerAdapter; import net.sourceforge.servestream.adapter.NavigationDrawerAdapter.ItemAccess; import net.sourceforge.servestream.fragment.AlarmClockFragment; import net.sourceforge.servestream.fragment.BrowseFragment; import net.sourceforge.servestream.fragment.UrlListFragment; import net.sourceforge.servestream.fragment.UrlListFragment.BrowseIntentListener; import net.sourceforge.servestream.preference.UserPreferences; import net.sourceforge.servestream.utils.DownloadScannerDialog; import net.sourceforge.servestream.utils.MusicUtils; import net.sourceforge.servestream.utils.MusicUtils.ServiceToken; import net.sourceforge.servestream.utils.Utils; import android.content.ActivityNotFoundException; import android.content.ComponentName; import android.content.Intent; import android.content.ServiceConnection; import android.content.res.Configuration; import android.net.Uri; import android.os.Bundle; import android.os.IBinder; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarActivity; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ListView; public class MainActivity extends ActionBarActivity implements ServiceConnection, BrowseIntentListener, ItemAccess { private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item"; private final static String DOWNLOAD_SCANNER_DIALOG = "download_scanner_dialog"; private String mTag; private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mDrawerTitle; private CharSequence mTitle; private String[] mDrawerItems; private ServiceToken mToken; private int mCurrentSelectedPosition = 0; @Override protected void onCreate(Bundle savedInstanceState) { setTheme(UserPreferences.getTheme()); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = mDrawerTitle = getTitle(); mDrawerItems = getResources().getStringArray(R.array.drawer_items); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); // set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(Utils.getThemedIcon(this, R.attr.drawer_shadow), GravityCompat.START); // set up the drawer's list view with items and click listener mDrawerList.setAdapter(new NavigationDrawerAdapter(this, this)); //mDrawerList.setAdapter(new ArrayAdapter<String>(this, // R.layout.drawer_list_item, mDrawerItems)); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the sliding drawer and the action bar app icon mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */ mDrawerLayout, /* DrawerLayout object */ Utils.getThemedIcon(this, R.attr.ic_drawer), /* nav drawer image to replace 'Up' caret */ R.string.drawer_open, /* "open drawer" description for accessibility */ R.string.drawer_close /* "close drawer" description for accessibility */ ) { public void onDrawerClosed(View view) { getSupportActionBar().setTitle(mTitle); } public void onDrawerOpened(View drawerView) { getSupportActionBar().setTitle(mDrawerTitle); } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { openUri(getUri()); //selectItem(0); } mToken = MusicUtils.bindToService(this, this); } @Override public void onNewIntent(Intent intent) { super.onNewIntent(intent); setIntent(intent); if (intent.hasExtra("restart_app")) { Intent i = getIntent(); i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); finish(); startActivity(i); } else { openUri(getUri()); } } @Override public void onDestroy() { super.onDestroy(); MusicUtils.unbindFromService(mToken); } @Override public void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); // Restore the previously serialized current dropdown position. if (savedInstanceState.containsKey(STATE_SELECTED_NAVIGATION_ITEM)) { mTag = savedInstanceState.getString(STATE_SELECTED_NAVIGATION_ITEM); } } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // Serialize the current dropdown position. outState.putString(STATE_SELECTED_NAVIGATION_ITEM, mTag); } /* Called whenever we call invalidateOptionsMenu() */ @Override public boolean onPrepareOptionsMenu(Menu menu) { return super.onPrepareOptionsMenu(menu); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // The action bar home/up action should open or close the drawer. // ActionBarDrawerToggle will take care of this. if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action buttons switch (item.getItemId()) { case (R.id.menu_item_settings): startActivity(new Intent(this, SettingsActivity.class)); return true; case (R.id.menu_item_scan): try { Intent intent = new Intent("com.google.zxing.client.android.SCAN"); intent.setPackage("com.google.zxing.client.android"); intent.putExtra("SCAN_MODE", "QR_CODE_MODE"); startActivityForResult(intent, 0); } catch (ActivityNotFoundException ex) { showDialog(DOWNLOAD_SCANNER_DIALOG); } return true; default: return super.onOptionsItemSelected(item); } } @Override public void startActivity(Intent intent) { // check if search intent if (Intent.ACTION_SEARCH.equals(intent.getAction())) { Fragment fragment = getSupportFragmentManager().findFragmentByTag(mTag); if (fragment != null && fragment instanceof BrowseFragment) { intent.putParcelableArrayListExtra("uris", ((BrowseFragment) fragment).getUris()); } } super.startActivity(intent); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { Fragment fragment = getSupportFragmentManager().findFragmentByTag(mTag); if (fragment != null && fragment instanceof BrowseFragment) { ((BrowseFragment) fragment).onBackKeyPressed(); return true; } } return super.onKeyDown(keyCode, event); } @Override public void onActivityResult(int requestCode, int resultCode, Intent intent) { if (requestCode == 0) { if (resultCode == RESULT_OK) { String contents = intent.getStringExtra("SCAN_RESULT"); // Handle successful scan openUri(contents); } else if (resultCode == RESULT_CANCELED) { // Handle cancel } } } /* The click listener for ListView in the navigation drawer */ private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } } private void selectItem(int position) { if (position == 3) { startActivity(new Intent(this, SettingsActivity.class)); mDrawerLayout.closeDrawer(mDrawerList); return; } mCurrentSelectedPosition = position; FragmentManager fragmentManager = getSupportFragmentManager(); Fragment fragment = getSupportFragmentManager().findFragmentByTag(mTag); if (fragment != null) { fragmentManager.beginTransaction().detach(fragment).commit(); } String tag = String.valueOf(position); fragment = getSupportFragmentManager().findFragmentByTag(tag); if (fragment == null) { if (position == 0) { fragment = new UrlListFragment(); fragment.setArguments(new Bundle()); } else if (position == 1) { fragment = new BrowseFragment(); fragment.setArguments(new Bundle()); } else if (position == 2) { fragment = new AlarmClockFragment(); } fragmentManager.beginTransaction().add(R.id.content_frame, fragment, tag).commit(); } else { fragmentManager.beginTransaction().attach(fragment).commit(); } mTag = tag; // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); setTitle(mDrawerItems[position]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getSupportActionBar().setTitle(mTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls mDrawerToggle.onConfigurationChanged(newConfig); } private String getUri() { String intentUri = null; String contentType = null; Intent intent = getIntent(); if (intent == null) { return null; } // check to see if we were called from a home screen shortcut if ((contentType = intent.getType()) != null) { if (contentType.contains("net.sourceforge.servestream/")) { intentUri = intent.getType().toString().replace("net.sourceforge.servestream/", ""); setIntent(null); return intentUri; } } // check to see if we were called by clicking on a URL if (intent.getData() != null) { intentUri = intent.getData().toString(); } // check to see if the application was opened from a share intent if (intent.getExtras() != null && intent.getExtras().getCharSequence(Intent.EXTRA_TEXT) != null) { intentUri = intent.getExtras().getCharSequence(Intent.EXTRA_TEXT).toString(); } setIntent(null); return intentUri; } @Override public void onServiceConnected(ComponentName name, IBinder service) { //MusicUtils.updateNowPlaying(this); } @Override public void onServiceDisconnected(ComponentName name) { finish(); } private void openUri(String uri) { mCurrentSelectedPosition = 0; Bundle args = new Bundle(); args.putString(UrlListFragment.ARG_TARGET_URI, uri); FragmentManager fragmentManager = getSupportFragmentManager(); Fragment fragment = getSupportFragmentManager().findFragmentByTag(mTag); if (fragment != null) { fragmentManager.beginTransaction().detach(fragment).commit(); } String tag = String.valueOf(0); fragment = getSupportFragmentManager().findFragmentByTag(tag); if (fragment == null) { fragment = new UrlListFragment(); fragment.setArguments(args); fragmentManager.beginTransaction().add(R.id.content_frame, fragment, tag).commit(); } else { fragment.getArguments().putString(UrlListFragment.ARG_TARGET_URI, uri); fragmentManager.beginTransaction().attach(fragment).commit(); } mTag = tag; mDrawerList.setItemChecked(0, true); setTitle(mDrawerItems[0]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void browseToUri(Uri uri) { mCurrentSelectedPosition = 1; Bundle args = new Bundle(); args.putString(UrlListFragment.ARG_TARGET_URI, uri.toString()); FragmentManager fragmentManager = getSupportFragmentManager(); Fragment fragment = getSupportFragmentManager().findFragmentByTag(mTag); if (fragment != null) { fragmentManager.beginTransaction().detach(fragment).commit(); } String tag = String.valueOf(1); fragment = getSupportFragmentManager().findFragmentByTag(tag); if (fragment == null) { fragment = new BrowseFragment(); fragment.setArguments(args); fragmentManager.beginTransaction().add(R.id.content_frame, fragment, tag).commit(); } else { fragment.getArguments().putString(UrlListFragment.ARG_TARGET_URI, uri.toString()); fragmentManager.beginTransaction().attach(fragment).commit(); } mTag = tag; mDrawerList.setItemChecked(1, true); setTitle(mDrawerItems[1]); mDrawerLayout.closeDrawer(mDrawerList); } private void showDialog(String tag) { // DialogFragment.show() will take care of adding the fragment // in a transaction. We also want to remove any currently showing // dialog, so make our own transaction and take care of that here. FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); Fragment prev = getSupportFragmentManager().findFragmentByTag(tag); if (prev != null) { ft.remove(prev); } DialogFragment newFragment = null; // Create and show the dialog. newFragment = DownloadScannerDialog.newInstance(); ft.add(0, newFragment, tag); ft.commit(); } @Override public int getSelectedItemIndex() { return mCurrentSelectedPosition; } }