jdanieldetes / android_intents

Android Intents

Requirements

For this project, you will be creating a multi page app. The first page will allow the user to import images and list them by name. The second will allow the user to view and edit details of a single image (these are details that you choose and do not need to be permanent). The third will allow the user to view the selected image in full screen.
This will encompass many of the skills you have developed over the Intro to Android course. We'll give you a few tips on how to process.

Part 1 - Create an Android Studio Project

1. Create a new Android Studio project
2. Name the project "Image Viewer"
3. Make sure that the target API level is below that of your testing environment.

Part 2 - Build layout for the Add and List activity

1. Open the app's activity_main.xml file.
2. Change the parent viewgroup to a linear layout

Set the orientation attribute to vertical to best utilize the screen real estate

4. Add a ScrollView to list all previously viewed images. Give it a linear layout child.
5. Add a Button so the user select an image to add to the list
6. Add IDs to all the views that will need to be accessed in the code.

Part 3 - Create an ImageData Class

1. Create a class to store desired data from a retreived image.

The only required data is a name and a Uri stored as a String. Convert a Uri to a string with .toString() method and back with Uri.parse(stringUri).

2. Class must contain : Serializable at the end of the class signature

This provides the necessary methods to the Intent.putExtra method can store the class's data

3. Make all the data members private and create getters and setters for them

The Uri setter should convert the Uri to a String and the getter should convert it back. This is because a Uri object can't be serialized.

Part 4 - Write a method to generate a TextView object

1. Add a TextView to your layout xml file.
2. Manipulate its attributes until you find a design that you like.
3. Write a method that will create a TextView object and add those attributes to it programatically.
4. The method must accept a String to be the view's text attribute and an int which is the index where the element is stored in the List.
5. Return the TextView from the method.
6. To add the TextView to the ui, pass it to your ScrollView's LinearLayout child's .addView() method.

Look at the code in this file for a reminder on how to do this. https://github.com/ChancePayne/MattsList/blob/master/app/src/main/java/com/lambdaschool/mattslist/MainActivity.kt

Part 5 - Create an Intent to Get an Image

1. Create a listener and event handler for the add button in MainActivity.java
2. In the click event method, write a Get Content Implicit Event that retreives an image from the system.
3. Broadcast that intent with a startActivityForResult method call.
4. Override the onActivityResult method to create the ImageData object, add it to an ArrayList class data memeber have a TextView generated and added to your UI.

Part 6 - Test your App

1. Thoroughly test this activity before moving on.

Part 7 - Add a click listener to the items in the list

1. In your TextView generator give the TextView object a listener that will get the tag from the element, use that to pull the ImageData object from the List.
2. Use intent.putExtra() to add the object to the intent

Part 8 - Build the layout for the details activity

1. Design a layout that will display details about the file.
2. Display the image somewhere in the layout.

Part 9 - Retreive the Object from the Intent

1. Use getIntent() to get the intent used to launch this activity.
2. Use the intent.getSerializableExtra() method to retreive the serialized data and then cast it to ImageData.

• the final line of code should look something like this val myObject = intent.getSerializableExtra("KEY") as ImageData

Part 10 - Display object

1. Show the desired data in the UI.
2. Use .setImageURI() to get the image for your ImageView to the one in our ImageData

Part 11 - Test your App

1. Thoroughly test these two activities before moving on.

Challenge (Optional)

Part 12 - Build Fullscreen Layout

1. Add an activity

You can pick a Fullscreen activity from the new activity wizard and adapt it to your needs, or build an empty activity with full screen imageview element

2. Adapt generated layout to fit your needs

Part 13 - Built an intent to go to the next activity

1. Build an intent to go to the next activity, but instead of passing the whole object, just pass the String value for the Uri.

Part 14 - Add the image to the UI

1. Use the intent.getStringExtra() method to retreive the String Uri from the Intent
2. Use .setImageURI() to update the Uri

Submit

Send your completed app to your Project Manager.