CSE476 Mobile Application Development. Yard. Doç. Dr. Tacha Serif Department of Computer Engineering Yeditepe University

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1 CSE476 Mobile Application Development Yard. Doç. Dr. Tacha Serif Department of Computer Engineering Yeditepe University Fall 2015 Yeditepe University 2015 Outline Dalvik Debug Monitor Service (DDMS) DDMS Functions Intent Implicit vs Explicit Intents Intent Filter How to start Activities Intent Example CSE476 Mobile Application Development Yeditepe University Page 2 1

2 Dalvik Debug Monitor Service (DDMS) The Dalvik Debug Monitor Service (DDMS) is a debugging utility that is integrated into Eclipse through the DDMS perspective. The DDMS perspective provides a number of useful features for interacting with emulators and handsets CSE476 Mobile Application Development Yeditepe University Page 3 DDMS Functions The features of DDMS are roughly divided into five functional areas: Task management File management Emulator interaction Logging Screen captures CSE476 Mobile Application Development Yeditepe University Page 4 2

3 DDMS Managing Tasks The top-left corner of the DDMS lists the emulators and handsets currently connected. You can select individual instances and inspect processes and threads. CSE476 Mobile Application Development Yeditepe University Page 5 DDMS File System You can use the DDMS File Explorer to browse files and directories on the emulator or a device You can copy files between the Android file system and your development machine by using the push and pull CSE476 Mobile Application Development Yeditepe University Page 6 3

4 DDMS - Simulating Calls CSE476 Mobile Application Development Yeditepe University Page 7 DDMS - Screenshot CSE476 Mobile Application Development Yeditepe University Page 8 4

5 Intent An Intent object encapsulates a task request used by the Android operating system. When the startactivity() method is called with the Intent parameter, the Android system matches the Intent action with appropriate activity on the Android system. That activity is then launched. The Android system handles all intent resolution. An intent can be very specific, including a request for a specific activity to be launched, or somewhat vague, requesting that any activity matching certain criteria be launched. CSE476 Mobile Application Development Yeditepe University Page 9 Implicit vs Explicit Intents Android supports explicit intents and implicit intents. Explicit intent names the component, e.g. the Java class which should be called. Implicit intents asked the system to perform a service without telling the system which Java class should do this service. In constructing an implicit Intent you specify the action which should be performed and optionally an URI which should be used for this action. For example you could tell the system that you want to view (action) a webpage (URI). By starting an intent for this data the system would try to find an application which is registered for this event, e.g. a browser. You can add more data to the Intent by adding "extras" to the Intent. These are key/value pairs. To get the Intent information in the called Activity use the method getintent(). If the Activity was called via an implicit Intent you can receive the data and url from this Intent via getaction(), getdata() and getextras(). CSE476 Mobile Application Development Yeditepe University Page 10 5

6 Intent Filter The Android system will determine suitable applications for an implicit intent and if several applications exists offer the user the choice to open one. The determination is based on intent filters, e.g. the class "android.content.intentfilter". Intent filters are typically defined via the "AndroidManifest.xml" file. To react to a certain implicit intent an application component must register itself via an IntentFilter in the "AndroidManifest.xml" to this event. If a component does not define intent filters it can only be called by explicit intents. CSE476 Mobile Application Development Yeditepe University Page 11 How to start activities To start an activity use the method startactivity(intent) if you do not need a return value from the called activity. If you need some information from the called activity use the method startactivityforresult(). Once the called Activity is finished the method onactivityresult() in the calling activity will be called. If you use startactivityforresult() then the activity which is started is considered a "Sub-Activity". CSE476 Mobile Application Development Yeditepe University Page 12 6

7 Intent Example - Layout <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android=" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/button01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="call browser" <Button android:id="@+id/button02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="call Someone" android:width="100px" <Button android:id="@+id/button03" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="dial" android:width="100px" <Button android:id="@+id/button04" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="show Map" android:width="100px" <Button android:id="@+id/button05" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="search on Map" android:width="100px" <Button android:id="@+id/button06" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="take picture" android:width="100px" <Button android:id="@+id/button07" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="show contacts" android:width="100px" <Button android:id="@+id/button08" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="edit first contact" android:width="100px" </LinearLayout> CSE476 Mobile Application Development Yeditepe University Page 13 AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android=" package= com.example" android:versioncode="1" android:versionname="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".callintents" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> </application> <uses-sdk android:minsdkversion="9" /> <uses-permission android:name="android.permission.call_privileged"></uses-permission> <uses-permission android:name="android.permission.call_phone"></uses-permission> <uses-permission android:name="android.permission.internet"></uses-permission> <uses-permission android:name="android.permission.camera"></uses-permission> <uses-permission android:name="android.permission.read_contacts"></uses-permission> </manifest> CSE476 Mobile Application Development Yeditepe University Page 14 7

8 CallIntents.java package com.exaple; import android.app.activity; import android.content.intent; import android.net.uri; import android.os.bundle; import android.view.view; import android.widget.toast; public class CallIntends extends Activity { /** Called when the activity is first created. public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); } public void callintent(view view) { Intent intent = null; switch (view.getid()) { case R.id.Button01: intent = new Intent(Intent.ACTION_VIEW, Uri.parse(" CSE476 Mobile Application Development Yeditepe University Page 15 CallIntents.java case R.id.Button02: intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:(+90) ")); case R.id.Button03: intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:(+49) ")); case R.id.Button04: intent = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:50.123,7.1434?z=19")); case R.id.Button05: intent = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:0,0?q=query")); case R.id.Button06: intent = new Intent("android.media.action.IMAGE_CAPTURE"); startactivityforresult(intent, 0); case R.id.Button07: intent = new Intent(Intent.ACTION_VIEW, Uri.parse("content://contacts/people/")); CSE476 Mobile Application Development Yeditepe University Page 16 8

9 CallIntents.java case R.id.Button08: intent = new Intent(Intent.ACTION_EDIT, Uri.parse("content://contacts/people/1")); default: } public void onactivityresult(int requestcode, int resultcode, Intent data) { if (resultcode == Activity.RESULT_OK && requestcode == 0) { String result = data.touri(); Toast.makeText(this, result, Toast.LENGTH_LONG); } } } CSE476 Mobile Application Development Yeditepe University Page 17 9