Implementing Programming Languages An Introduction To Compilers And Interpreters 1st Edition Department Of Philosophy Aarne Ranta - Solutions

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=+4. Add a new Class file to the package and name it SecondActivity. Populate the SecondActivity.java file as follows:package com.jfdimarzio.passingdata;import android.app.Activity;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import
=+ @Override public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);//---get the data passed in using getStringExtra()---Toast.makeText(this,getIntent().getStringExtra("str1"), Toast.LENGTH_SHORT).show();//---get the data passed
=+ public void onClick(View view) {//---use an Intent object to return data---Intent i = new Intent();//---use the putExtra() method to return some// value---i.putExtra("age3", 45);//---use the setData() method to return some value---i.setData(Uri.parse("Something passed back to main
=+5. Add the bolded statements from the following code to the AndroidManifest.xml file:
=+6. Add the bolded statements from the following code to the MainActivity.java file:package com.jfdimarzio.passingdata;import android.content.Intent;import android.Activity;import android.os.Bundle;import android.view.View;import android.widget.Toast;public class MainActivity extends Activity
=+ public void onClick(View view) {Intent i = new Intent("com.jfdimarzio.passingdata.SecondActivity");//---use putExtra() to add new name/value pairs---i.putExtra("str1", "This is a string");i.putExtra("age1", 25);//---use a Bundle object to add new name/values// pairs---Bundle extras = new
=+public void onActivityResult(int requestCode, int resultCode, Intent data)//---check if the request code is 1---if (requestCode == 1) {//---if the result is OK---if (resultCode == RESULT_OK) {//---get the result using getIntExtra()---Toast.makeText(this, Integer.toString(data.getIntExtra("age3",
=+7. Press Shift+F9 to debug the application on the Android emulator. Click the button on each activity and observe the values displayed.How It Works
=+While this application is not visually exciting, it does illustrate some important ways to pass data between activities.First, you can use the putExtra() method of an Intent object to add a name/value pair://---use putExtra() to add new name/value pairs---i.putExtra("str1", "This is a
=+The preceding statements add two name/value pairs to the Intent object: one of type string and one of type integer.Besides using the putExtra() method, you can also create a Bundle object and then attach it using the putExtras() method. Think of a Bundle object as a dictionary object—it
=+To obtain the data sent using the Intent object, you first obtain the Intent object using the getIntent() method. Then, call its getStringExtra() method to get the string value set using the putExtra() method://---get the data passed in using
=+In this case, you have to call the appropriate method to extract the name/value pair based on the type of data set. For the integer value, use the getIntExtra() method (the second argument is the default value in case no value is stored in the specified name)://---get the data passed in using
=+To get the individual name/value pairs, use the appropriate method. For the string value, use the getString() method://---get the data using the getString()---Toast.makeText(this, bundle.getString("str2"), Toast.LENGTH_SHORT).show();Likewise, use the getInt() method to retrieve an integer
=+Another way to pass data to an activity is to use the setData() method (as used in the previous section), like this://---use the setData() method to return some value---i.setData(Uri.parse("Something passed back to main activity"));
=+Usually, you use the setData() method to set the data on which an Intent object is going to operate, such as passing a URL to an Intent object so that it can invoke a web browser to view a web page.(For more examples, see the section “Calling Built-In Applications Using Intents,” later in
=+1. Using Android Studio, create a new Android project and name it Fragments.
=+2. In the res/layout folder, add a new layout resource file and name it fragment1.xml. Populate it with the following code. Be sure to change all instances of "com.jfdimarzio" to whatever package name your project is using.
=+3. Also in the res/layout folder, add another new layout resource file and name it fragment2.xml.Populate it as follows:
=+4. In activity_main.xml, add the bolded lines in the following code:
=+5. Under the /fragments package name, add two Java class files and name them Fragment1.java and Fragment2.java.
=+6. Add the following code to Fragment1.java:package com.jfdimarzio.fragments;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class Fragment1 extends Fragment {@Override public View
=+7. Add the following code to Fragment2.java:package com.jfdimarzio.fragments;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class Fragment2 extends Fragment {@Override public View
=+8. Press Shift+F9 to debug the application on the Android emulator. Figure 3-16 shows the two fragments contained within the activity.
=+1. To create an activity, you create a Java class that extends what base class?
=+2. What attribute of the Application element is used to specify the theme?
=+3. What method do you override when displaying a dialog?
=+4. What is used to navigate between activities?
=+5. What method should you use if you plan on receiving information back from an activity?
=+➤ How ViewGroups and Layouts can be used to lay out your views and organize your application screen
=+➤ How to adapt and manage changes in screen orientation
=+➤ How to create the UI programmatically
=+➤ How to listen for UI notifications
=+1. Create a new layout resource file named linearlayouts_example.xml. By default, this new file will be created with a LinearLayout (Vertical).
=+2. Place three stacked TextViews in a single column within the LinearLayout.
=+3. Place a LinearLayout (Horizontal) under the third TextView.
=+4. Place three buttons in a row within the LinearLayout (Horizontal).
=+1. What is the difference between the dp unit and the px unit? Which one should you use to specify the dimension of a view?
=+2. Why is the AbsoluteLayout not recommended for use?
=+3. What is the difference between the onPause()method and the onSaveInstanceState()method?
=+4. Name the three methods you can override to save an activity’s state. In what instances should you use the various methods?
=+5. How do you add action items to the Action Bar?
=+➤ How to use the basic views in Android to design your user interface
=+➤ How to use the picker views to display lists of items
=+➤ How to use the list views to display lists of items
=+➤ How to use specialized fragments
=+1. How do you programmatically determine whether a RadioButton is checked?
=+2. How do you access the string resource stored in the strings.xml file?
=+3. Write the code snippet to obtain the current date.
=+4. Name the three specialized fragments you can use in your Android application and describe their uses.
=+➤ How to use the ImageSwitcher, GridView, and ImageView views to display images
=+➤ How to display options menus and context menus
=+➤ How to display web content using the WebView view
=+1. What is the purpose of the ImageSwitcher?
=+2. Name the two methods you need to override when implementing an options menu in your activity.
=+3. Name the two methods you need to override when implementing a context menu in your activity?
=+➤ How to save simple data using the SharedPreferences object
=+➤ How to enable users to modify preferences using a PreferenceActivity class
=+➤ How to write and read files in internal and external storage
=+➤ How to create and use a SQLite database
=+➤ What content providers are
=+➤ How to use a content provider in Android
=+➤ How to create and use your own content provider
=+1. How do you display the preferences of your application using an activity?
=+2. Name the method that enables you to obtain the external storage path for an Android device.
=+3. What method is called when a database needs to be upgraded?
=+➤ How to send SMS messages programmatically from within your application
=+➤ How to send SMS messages using the built-in Messaging application
=+➤ How to receive incoming SMS messages
=+➤ How to send email messages from your application
=+1. Write the query to retrieve all contacts from the Contacts application that contain the word “jack.”
=+2. Name the methods that you need to override in your own implementation of a content provider.
=+3. How do you register a content provider in your AndroidManifest.xml file?
=+1. Name the two ways in which you can send SMS messages in your Android application.
=+2. Name the permissions you need to declare in your AndroidManifest.xml file for sending and receiving SMS messages.
=+3. How do you notify an activity from a BroadcastReceiver?
=+➤ How to connect to the web using HTTP
=+➤ How to consume XML web services
=+➤ How to consume JSON web services
=+➤ How to connect to a Socket server
=+1. If you have embedded the Google Maps API into your Android application but it does not show the map when the application is loaded, what could be the likely reasons?
=+2. What is the difference between geocoding and reverse geocoding?
=+3. Name the two location providers that you can use to obtain your location data.
=+1. Name the permissions you need to declare in your AndroidManifest.xml file for an HTTP connection.
=+2. Name the classes used for dealing with JSON messages.
=+3. Name the class for performing background asynchronous tasks.
=+➤ How to create a service that runs in the background
=+➤ How to perform long-running tasks in a separate thread
=+➤ How to perform repeated tasks in a service
=+➤ How an activity and a service communicate
=+1. Why is it important to put long-running code in a service on a separate thread?
=+2. What is the purpose of the IntentService class?
=+3. Name the three methods you need to implement in an AsyncTask class.
=+4. How can a service notify an activity of an event happening?
=+5. For threading, what is the recommended method to ensure that your code runs without tying up the UI of your application?
How would you evaluate the effectiveness of IBM’s web-based mentoring program?
Is IBM’s program really a mentoring program? Why or why not?
What advantages and disadvantages does IBM’s program have for mentors? For protégés? For mentees?
Do you think the advice you can get electronically is just as good as the advice you might get from a mentor in a face-to-face relationship? Explain.
Go to en.wikipedia.org/wiki/Blog to learn about blogs. What is a blog? How might a blog be useful for training or development?
GeoLearning is an application service provider (ASP). Visit www.geolearning.com. What services and products does this ASP provide?

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Implementing Programming Languages An Introduction To Compilers And Interpreters 1st Edition Department Of Philosophy Aarne Ranta - Solutions

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