Ch2 first app

1. First Android App

2. Create a Android Project

3. File > Android Application Project

4. Android App Name

5. Eclipse Project Name

6. App Package Name Google play package is only

11. Running Your First App

15. Introduction directories and ﬁles in the Android project

16. The ﬁrst Android project architecture http://developer.android.com/tools/projects/index.html

17. AndroidManifest.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" 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>

21. res/values/string.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" 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>

22. res/values/string.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" 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> <?xml version="1.0" encoding="utf-‐8"?> <resources> ! <string name="app_name">FirstApp</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> ! </resources>

23. res/values/string.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" 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> <?xml version="1.0" encoding="utf-‐8"?> <resources> ! <string name="app_name">FirstApp</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> ! </resources>

25. src/{your package name}/ MainActivity.java public class MainActivity extends ActionBarActivity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } ! @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }

26. src/{your package name}/ MainActivity.java public class MainActivity extends ActionBarActivity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } ! @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }

27. res/layout/activity_main.xml public class MainActivity extends ActionBarActivity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } ! @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } <RelativeLayout xmlns:android="http://schemas.android.com/apk/ res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.firstapp.MainActivity" > ! <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> ! </RelativeLayout>

28. res gen src bin jni libs assets layout layout-land = 橫向 layout-port = 直向 drawable xlarge = 960dp x 720dp large = 640dp x 480dp normal = 470dp x 320dp small = 426dp x 320dp menu Menu item value color.xml string.xml style.xml

29. res gen src bin jni libs assets BuildConﬁg.java /** Automatically generated file. DO NOT MODIFY */ package com.example.firstapp; ! public final class BuildConfig { public final static boolean DEBUG = true; }

30. res gen src bin jni libs assets R.java AUTO-‐GENERATED FILE. DO NOT MODIFY. package com.example.firstapp; ! public final class R { public static final class layout { public static final int activity_main=0x7f040000; } ………… }

31. res gen src bin jni libs assets package com.example.firstapp; ! import android.app.Activity; import android.os.Bundle; ! public class MainActivity extends Activity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! }

32. res gen src bin jni libs assets

34. res gen src bin jni libs assets Third party library

35. res gen src bin jni libs assets This is empty. You can use it to store raw asset files. Files that you save here are compiled into an .apk file as-is, and the original filename is preserved. You can navigate this directory in the same way as a typical file system using URIs and read files as a stream of bytes using the AssetManager. For example, this is a good location for textures and game data.

36. res gen src bin jni libs assets Android Project Builder

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