Android™ Application Development - Bahar Ali Khan

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Chapter 5: Intents, Broadcast Receivers, Adapters, and the Internet Responding to Intent Filter Matches 124 When an application component is started through an implicit Intent, it needs to fi nd the action it is to perform and the data upon which to perform it. Call the getIntent method — usually from within the onCreate method — to extract the Intent used to launch a component, as shown below: @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); } Intent intent = getIntent(); Use the getData and getAction methods to fi nd the data and action of the Intent. Use the type-safe getExtra methods to extract additional information stored in its extras Bundle. String action = intent.getAction(); Uri data = intent.getData(); Passing on Responsibility You can use the startNextMatchingActivity method to pass responsibility for action handling to the next best matching application component, as shown in the snippet below: Intent intent = getIntent(); if (isAfterMidnight) startNextMatchingActivity(intent); This allows you to add additional conditions to your components that restrict their use beyond the ability of the Intent Filter–based Intent resolution process. In some cases, your component may wish to perform some processing, or offer the user a choice, before passing the Intent on to the native handler. Select a Contact Example In this example, you’ll create a new sub-Activity that services the PICK_ACTION for contact data. It displays each of the contacts in the contact database and lets the user select one, before closing and returning its URI to the calling Activity. It’s worth noting that this example is somewhat contrived. Android already supplies an Intent Filter for picking a contact from a list that can be invoked by using the content:/contacts/people/ URI in an implicit Intent. The purpose of this exercise is to demonstrate the form, even if this particular implementation isn’t overly useful. 1. Create a new ContactPicker project that includes a ContactPicker Activity. package com.paad.contactpicker; import android.app.Activity;
Chapter 5: Intents, Broadcast Receivers, Adapters, and the Internet import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.Contacts.People; import android.view.View; import android.widget.AdapterView; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import android.widget.AdapterView.OnItemClickListener; public class ContactPicker extends Activity { @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); } } 2. Modify the main.xml layout resource to include a single ListView control. This control will be used to display the contacts. 3. Create a new listitemlayout.xml layout resource that includes a single Text View. This will be used to display each contact in the List View. 125
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 6: Data Storage, Retrieval,
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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} Chapter 6: Data Storage, Retrieva
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Adding, Updating, and Deleting Cont
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} } Chapter 6: Data Storage, Retrie
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} Chapter 6: Data Storage, Retrieva
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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Summary Chapter 7: Maps, Geocoding,
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Chapter 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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} Chapter 9: Peer-to-Peer Communica
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Handling Subscription Requests Chap
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Figure 9-4 Chapter 9: Peer-to-Peer
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Accessing Android Hardware Android
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Chapter 10: Accessing Android Hardw
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content.put(Audio.AudioColumns.DATE
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public void onShutter() { // TODO D
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public void setPitch(float pitch) {
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Chapter 11: Advanced Android Develo
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400 Android, getting started Androi
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402 databases databases creating ea
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404 interapplication communication
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406 passing custom class objects pa
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408 synchronizing threads synchroni
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Programmer to Programmer Get more
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Android™ Application Development - Bahar Ali Khan

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