Android Tutorial

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import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity{ } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } //--- Implement the event handler for the first button. public void doSmall(View v) { // --- find the text view -- TextView txtView = (TextView) findViewById(R.id.text_id); // -- change text size -- txtView.setTextSize(14); return; } //--- Implement the event handler for the second button. public void doLarge(View v) { // --- find the text view -- TextView txtView = (TextView) findViewById(R.id.text_id); // -- change text size -- txtView.setTextSize(24); return; } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } Following will be the content of res/layout/activity_main.xml file. Here we have to addandroid:onClick="methodName" for both the buttons, which will register given method names as click event handlers. TUTORIALS POINT Simply Easy Learning
Again let's try to run your EventDemo application. I assume you had created your AVD 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: Now you try to click on two buttons one by one and you will see that font of the Hello World text will change, which happens because registered click event handler method is being called against each click event. Exercise: I will recommend to try writing different event handlers for different event types and understand exact difference in different event types and their handling. Events related to menu, spinner, pickers widgets are little different but they are also based on the same concepts as explained above. 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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} super(context, DATABASE_NAME, nul
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} return count; } @Override public
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Now let's enter student Name and Gr
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You can write activities against up
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The application can embed two fragm
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Here is the list of important metho
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} } * Inflate the layout for this f
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To change the mode of the emulator
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CHAPTER 12 Intents and Filters An A
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16 17 18 19 20 21 22 23 24 25 26 27
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56 57 58 ACTION_VOICE_COMMAND Start
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21 CATEGORY_INFO Provides informati
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20 EXTRA_SHORTCUT_NAME The name of
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super.onCreate(savedInstanceState);
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Similar way you can launch phone in
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setContentView(R.layout.activity_ma
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Let's try to run
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Now if you select Browser, then And
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CHAPTER 13 UI Layouts The basic bui
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1 You will use Eclipse IDE to creat
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Relative Layout Android RelativeLay
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Example This example will take you
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android:layout_toLeftOf="@+id/times
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2 Modify the detault content of res
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android:layout_x android:layout_y T
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Following are the important attribu
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Android ListView is a view which gr
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android:id="@+id/country_list" andr
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Defines how columns should stretch
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HelloWorld Settings Following will
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Let's try to run our modified Hello
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int position, long id) { // Send in
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android:targetSdkVersion="17" />
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Kindly note above mentioned images
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fill_horizontal 0x07 Grow the horiz
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suggestions automatically while the
Page 129 and 130: normal - 0 sans - 1 serif - 2 mo
Page 131 and 132: android:name="com.example.guidemo.M
Page 133 and 134: Inherited from android.view.View Cl
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Page 137 and 138: Exercise: I will recommend to try a
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Page 147 and 148: android:background android:contentD
Page 149 and 150: Following is the default content of
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Page 153 and 154: esult.append("\nPerl Selection : ")
Page 155 and 156: Let's try to run your GUIDemo6 appl
Page 157 and 158: android:editable android:text If se
Page 159 and 160: android:id="@+id/button1" android:l
Page 163 and 164: (R.id.radioGroup1); btnWebsiteName
Page 165 and 166: Let's try to run your GUIDemo8
Page 167 and 168: package com.example.guidemo9; impor
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Page 173 and 174: CHAPTER 15 Event Handling Events ar
Page 175 and 176: import android.app.Activity; import
Page 177 and 178: installs the app on your AVD and st
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Page 183 and 184: Defining Styles A style is defined
Page 185 and 186: } }); @Override public boolean onCr
Page 187 and 188: Let's try to run your StyleDemo a
Page 189 and 190: Following example demonstrates how
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Page 193 and 194: CHAPTER 17 Custom Components Androi
Page 195 and 196: 1 2 3 You will use Eclipse IDE to c
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Page 199 and 200: import android.content.Context; imp
Page 201 and 202: android:textSize="40sp" android:bac
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Page 205 and 206: Following example shows you how to
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Page 209 and 210: Example Following example shows the
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