This document provides an overview of Android application development including:
- Android uses a modified Linux kernel and allows developers to write code in Java.
- Common layouts for user interfaces include linear, relative, frame, and list views.
- Applications need to support multiple screen sizes by providing different layouts and resources.
- Challenges in app development include choosing the right IDE, implementing user interactions like spinners and clicks, managing activities, and optimizing layouts.
While it is technically possible to create and attach widgets to your activity purely through Java code, the more common approach is to use an XML-based layout file. Dynamic instantiation of widgets is reserved for more complicated scenarios, where the widgets are not known at compile time (e.g., populating a column of radio buttons based on data retrieved from the Internet).
With that in mind, this chapter discuss the XML way to lay out Android activity views that way
While it is technically possible to create and attach widgets to your activity purely through Java code, the more common approach is to use an XML-based layout file. Dynamic instantiation of widgets is reserved for more complicated scenarios, where the widgets are not known at compile time (e.g., populating a column of radio buttons based on data retrieved from the Internet).
With that in mind, this chapter discuss the XML way to lay out Android activity views that way
This presentation is about -
a) Understand the basics of auto Layout
b) Use Auto Layout programmatically
c) Debug Auto Layout
d) Constraints
e) Intrinsic content Size
f) Interface Builder and Constraints
g) Contraint Priorities
h)Constraints in Code
I)Debugging Auto layout
J)Animation Constraints
k)Visual Format Language
Android is a mobile operating system based on the linux and kernel. It's maintained by Google, and comes in a few different versions. At the time of writing, mobile phones run a variant of version
This presentation is about -
a) Understand the basics of auto Layout
b) Use Auto Layout programmatically
c) Debug Auto Layout
d) Constraints
e) Intrinsic content Size
f) Interface Builder and Constraints
g) Contraint Priorities
h)Constraints in Code
I)Debugging Auto layout
J)Animation Constraints
k)Visual Format Language
Android is a mobile operating system based on the linux and kernel. It's maintained by Google, and comes in a few different versions. At the time of writing, mobile phones run a variant of version
viWave Study Group - Introduction to Google Android Development - Chapter 23 ...Ted Chien
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https://bit.ly/3KACoyV
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Talk presented at Kubernetes Community Day, New York, May 2024.
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Wireless communication can be used for cellular telephony, wireless access to the internet, wireless home networking, and so on.
2. Overview/Design Guidelines
• A Mobile Operating System
• Uses a modified version of the Linux kernel
• Allows developers to write code in java language
• Third party application can be built using java and
android framework
Android 2.1 & Above
With
Eclipse IDE
5. Layouts & Screen Sizes
• FrameLayout
Layout that acts as a view frame to display a single object.
• LinearLayout
A layout that organizes its children into a single horizontal or vertical row. It creates
a scrollbar if the length of the window exceeds the length of the screen.
• RelativeLayout
Enables you to specify the location of child objects relative to each other (child A
to the left of child B) or to the parent (aligned to the top of the parent).
• ListView
Displays a scrolling single column list.
Common Layouts
6. • ScrollView
A vertically scrolling column of elements. Spinner Displays a single item at a time
from a bound list, inside a one-row textbox. Rather like a one-row
• TabHost
It provides a tab selection list that monitors clicks and enables the application to
change the screen whenever a tab is clicked.
• TableLayout
A tabular layout with an arbitrary number of rows and columns, each cell holding
the widget of your choice. The rows resize to fit the largest column. The cell
borders are not visible.
Layouts & Screen Sizes
Common Layouts
7. Layouts & Screen Sizes
Screen Sizes
Android runs on a variety of devices that offer different
screen sizes and densities
• xlarge screens are at least 960dp x 720dp
• large screens are at least 640dp x 480dp
• normal screens are at least 470dp x 320dp
• small screens are at least 426dp x 320dp
To support multiple screen size
• Explicitly declare in the manifest which screen sizes your application
supports
• Provide different layouts for different screen sizes
• Provide different bitmap drawables for different screen densities
9. Challenges faced while building
Naukri App
• Installing SDK for different Version of Android
• Choosing right IDE for development
• Using Spinner to choose value from the dropdown on runtime and from
set of array
• Calling spinner on clicking ImageView
• Choosing right layout to build XML
• Optimizing layout and making it re-usable
• Saving preferences
• Implementing multiple clicks on single activity
• Calling multiple activity for result on single activity
• Creating complete view on runtime
• Finishing activities correctly
10. Setting Up an Activity to set
background image and music
Background can contain image as well as music. Their time out can be handled
using simple threads in java.
Permissions Required –
<uses-permission android:name="android.permission.SET_WALLPAPER"></uses-
permission>
Setting up the Content View –
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.amazing);
}
Introduction to Media Player and Sound Pool –
MediaPlayer theSong = MediaPlayer.create(this, R.raw.uninvited);
theSong.start();
theSong.release();
11. Setting Up an Activity to set
background image and music
On pause Activity –
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
//theSong.stop(); // ---- this is same as Mediaplayer.release() the only
differnece is release method releases the other objects related to it and stop
method abruptly stops the object
theSong.release();
finish();
}
12. Creating a LIST/MENU and referencing
the selected Item
Extending ListActivity instead of Activity
Setting List –
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MenuApp.this,
android.R.layout.simple_list_item_1, classes);
setListAdapter(adapter);
OnListItemClick()
Setting MenuKey –
MenuInflater blowUp = getMenuInflater();
blowUp.inflate(R.menu.cool_menu, menu);
OnOptionsItemSelected()
13. Setting Up buttons and text views
Button add = (Button) findViewById(R.id.bAdd);
Button sub = (Button) findViewById(R.id.bSub);
TextView display = (TextView) findViewById(R.id.tvDisplay);
Setting onClickListeners() for button clicks –
add.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
counter++;
display.setText("Your Total is: " + counter);
//display.setText(Integer.toString(counter));
}
});
14. Setting Up buttons and text views
sub.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
counter--;
display.setText("Your total is : " + counter);
}
});
15. SETTING UP A FORM WITH EDITBOXES
AND TOGGLE BUTTON AND
SIMPLE BUTTONS
final ToggleButton passTog = (ToggleButton) findViewById(R.id.tbPassword);
final EditText Name = (EditText) findViewById(R.id.etName);
final EditText MobNum = (EditText) findViewById(R.id.etMobileNumber);
final EditText EmailId = (EditText) findViewById(R.id.etEmailID);
final EditText Password = (EditText) findViewById(R.id.etPassword);
16. SETTING UP A FORM WITH EDITBOXES AND
TOGGLE BUTTON AND SIMPLE BUTTONS
Setting the input type for password field on the basis of toggle button-
passTog.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(passTog.isChecked()){
Password.setInputType(InputType.TYPE_CLASS_TEXT |
InputType.TYPE_TEXT_VARIATION_PASSWORD);
}else{
Password.setInputType(InputType.TYPE_CLASS_TEXT);
}
}
});
17. SETTING UP A FORM WITH EDITBOXES AND
TOGGLE BUTTON AND SIMPLE BUTTONS
Setting Alert Boxes –
new AlertDialog.Builder(TextActs.this)
.setMessage("Please fill in the valid email address,
mobile number and password should be minimum 6 characters long")
.setTitle("Validation Error")
.setCancelable(true)
.setNeutralButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
whichButton){}
})
.show();
18. SENDING AN EMAIL FROM APPLICATION
Permission Required –
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
Setting Up Email intent –
String emailaddress[] = { emailAdd };
String message = “Some MEssage";
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, emailaddress);
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "I hate you!");
emailIntent.setType("plain/text");
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, message);
startActivity(emailIntent);
19. SAVING PREFERENCES
Preferences in Androids are like cookies on browsers which are saved in
the phone memory and can be accessed any time during the application.
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<EditTextPreference android:title="Edit Text”android:key="name"
android:summary="Enter your name” />
<CheckBoxPreference android:title="Music” android:defaultValue="true"
android:key="checkbox” android:summary="for the start screen">
</CheckBoxPreference>
<ListPreference android:title="list” android:key="list” android:summary="Choose from”
android:entries="@array/list” android:entryValues="@array/lValues"
></ListPreference>
</PreferenceScreen>