Android Tutorial

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android:layout_height="fill_parent"> Following will be the content of res/values/strings.xml to define two new constants: HelloWorld Settings Let's try to run our modified Hello World! application we just modified. I assume you had created yourAVD while doing environment setup. To run the app from Eclipse, open one of your project's activity files and click Run icon from the toolbar. Eclipse installs the app on your AVD and starts it and if everything is fine with your setup and application, it will display following Emulator window: List View TUTORIALS POINT Simply Easy Learning
<strong>Android</strong> ListView is a view which groups several items and display them in vertical scrollable list. The list items are automatically inserted to the list using an Adapter that pulls content from a source such as an array or database. An adapter actually bridges between UI components and the data source that fill data into UI Component. Adapter can be used to supply the data to like spinner, list view, grid view etc. The ListView and GridView are subclasses of AdapterView and they can be populated by binding them to an Adapter, which retrieves data from an external source and creates a View that represents each data entry. <strong>Android</strong> provides several subclasses of Adapter that are useful for retrieving different kinds of data and building views for an AdapterView ( ie. ListView or GridView). The two most common adapters areArrayAdapter and SimpleCursorAdapter. We will see separate examples for both the adapters. ListView Attributes Following are the important attributes specific to GridView: Attribute android:id Description This is the ID which uniquely identifies the layout. android:divider This is drawable or color to draw between list items. . android:dividerHeight android:entries android:footerDividersEnabled android:headerDividersEnabled This specifies height of the divider. This could be in px, dp, sp, in, or mm. Specifies the reference to an array resource that will populate the ListView. When set to false, the ListView will not draw the divider before each footer view. The default value is true. When set to false, the ListView will not draw the divider after each header view. The default value is true. ArrayAdapter You can use this adapter when your data source is an array. By default, ArrayAdapter creates a view for each array item by calling toString() on each item and placing the contents in a TextView. Consider you have an array of strings you want to display in a ListView, initialize a new ArrayAdapter using a constructor to specify the layout for each string and the string array: ArrayAdapter adapter = new ArrayAdapter(this, R.layout.ListView, StringArray); Here are arguments for this constructor: First argument this is the application context. Most of the case, keep it this. Second argument will be layout defined in XML file and having TextView for each string in the array. Final argument is an array of strings which will be populated in the text view. Once you have array adaptor created, then simply call setAdapter() on your ListView object as follows: ListView listView = (ListView) findViewById(R.id.listview); listView.setAdapter(adapter); You will define your list view under res/layout directory in an XML file. For our example we are going to using activity_main.xml file. TUTORIALS POINT Simply Easy Learning
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Android Tutorial
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ABOUT THE TUTORIAL Android Tutorial
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Accessing Resources ...............
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RadioButton .......................
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Web browser Multi-touch Multi-taski
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Alternatively, you could also right
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Step 4 - Setup Android Development
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Now select all the listed plug-ins
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CHAPTER 3 Architecture Android oper
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CHAPTER 4 Application Components Ap
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CHAPTER 5 Hello World Example Let u
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Anatomy of Android Application Befo
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else needed to run an Android appli
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The R File The gen/com.example.hell
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Congratulations!!! you have develop
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from the R.color class. drawable/ l
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Now you can set the text on a TextV
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onPause() onStop() onDestroy() The
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07-19 15:00:43.405: D/Android :(866
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To create an service, you create a
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} Example This example will take yo
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Following will be the content of
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To stop the service, you can click
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android:label="@string/app_name" an
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} { } Intent intent = new Intent();
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Now to broadcast our custom intent,
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CHAPTER 10 Content Providers A cont
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import android.net.Uri; import andr
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Page 61 and 62: Now let's enter student Name and Gr
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Page 99 and 100: Example This example will take you
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android:id="@+id/button1" android:l
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Exercise: I will recommend to try a
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(R.id.radioGroup1); btnWebsiteName
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Let's try to run your GUIDemo8
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package com.example.guidemo9; impor
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Following will be the conten
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The following screen will appear if
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CHAPTER 15 Event Handling Events ar
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import android.app.Activity; import
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installs the app on your AVD and st
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Now you try to click on two buttons
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Again let's try to run your EventD
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Defining Styles A style is defined
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} }); @Override public boolean onCr
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Let's try to run your StyleDemo a
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Following example demonstrates how
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android:orientation="vertical" >
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CHAPTER 17 Custom Components Androi
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1 2 3 You will use Eclipse IDE to c
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Let's try to run your DateV
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import android.content.Context; imp
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android:textSize="40sp" android:bac
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custom:delimiter="-" custom:fancyTe
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Following example shows you how to
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} Following will be the content of
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Example Following example shows the
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} } /* Invoking the default notific
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android:label="@string/app_name" an
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Next, you can click on "Detail of n
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