: Activity

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1- Activity.

2- Activity .

3- Activity.

4- Activity .

Activity

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Activity

class (HelloWorldActivity.java) src xml (main.xml) res/layout .

: 3 3 … xml .

: Activity :

HelloWorld HelloWorldActivity.java

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package com.androidhas.HelloWorld; import android.app.Activity;import android.os.Bundle; public class HelloWorldActivity extends Activity {/** Called when the activity is first created. lawn maintenance . */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);  }}

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import .

extends Activity … Object-oriented

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Activity .

onCreate Activity LifeCycle .

super .

setContentView ID xml

: ID R.java .

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: object-oriented .

main.xml

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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" > <TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/hello" /> </LinearLayout>

xml

UI 10

@ strings.xml res/values .

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Activity :

class extends Activity UI xml xml setContentView.

AndroidManifest.xml Exception.

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<activity> <intent-filter>

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<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.androidhas.HelloWorld"android:versionCode="1"android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" /> <applicationandroid:icon="@drawable/ic_launcher"android:label="@string/app_name" ><activityandroid:name=".HelloWorldActivity"android:label="@string/app_name" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application> </manifest>

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: Activity :

Activity Lifecycle .

callback .