android初学者日记1

android菜鸟日记1
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Android菜鸟日记

Android 应用程序主要由3部分组成：应用程序描述文件[xml], 各种资源的集合[res], 以及应用程序的源代码。

j2ee 开发与 android发开有高度的类似
j2ee 用标记语言构建view android也是，但Android用的标记语言xml 这种标记语言更好,无需硬编码应用程序的view,可以通过标记来修改应用程序的外观。

Android不允许在res 文件夹中的文件夹中创建文件夹
即不支持res/a/b如此。
只支持res/a




<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.notepad"
>
根包名(package)的定义是<mainfest>元素的一个特性[特性必须有]
每个activity 都有一个name特性。Name名即为类名[每个activity 对应一个类 此类完整包名为mainfestp package.name 这里的name对应的是根包名目录下的类]
确定了入口的activity  程序会调用onCreate()方法


    <application android:icon="@drawable/app_notes"
        android:label="@string/app_name"
    >
        <provider android:name="NotePadProvider"
            android:authorities="com.google.provider.NotePad"
        />


        <activity android:name="NotesList" android:label="@string/title_notes_list">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.EDIT" />
                <action android:name="android.intent.action.PICK" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.dir/vnd.google.note" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.GET_CONTENT" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
            </intent-filter>
        </activity>

        <activity android:name="NoteEditor"
            android:theme="@android:style/Theme.Light"
            android:label="@string/title_note"
            android:screenOrientation="sensor"
            android:configChanges="keyboardHidden|orientation"
        >
            <!-- This filter says that we can view or edit the data of
                 a single note -->
            <intent-filter android:label="@string/resolve_edit">
Intent 通常定义了某种工作的“意图”

                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.EDIT" />
                <action android:name="com.android.notepad.action.EDIT_NOTE" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
            </intent-filter>

            <!-- This filter says that we can create a new note inside
                 of a directory of notes. -->
            <intent-filter>
                <action android:name="android.intent.action.INSERT" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.dir/vnd.google.note" />
            </intent-filter>

        </activity>

        <activity android:name="TitleEditor"
            android:label="@string/title_edit_title"
            android:theme="@android:style/Theme.Dialog"
            android:windowSoftInputMode="stateVisible">
            <!-- This activity implements an alternative action that can be
                 performed on notes: editing their title.  It can be used as
                 a default operation if the user invokes this action, and is
                 available as an alternative action for any note data. -->
            <intent-filter android:label="@string/resolve_title">
                <!-- This is the action we perform.  It is a custom action we
                     define for our application, not a generic VIEW or EDIT
                     action since we are not a general note viewer/editor. -->
                <action android:name="com.android.notepad.action.EDIT_TITLE" />
                <!-- DEFAULT: execute if being directly invoked. -->
                <category android:name="android.intent.category.DEFAULT" />
                <!-- ALTERNATIVE: show as an alternative action when the user is
                     working with this type of data. -->
                <category android:name="android.intent.category.ALTERNATIVE" />
                <!-- SELECTED_ALTERNATIVE: show as an alternative action the user
                     can perform when selecting this type of data. -->
                <category android:name="android.intent.category.SELECTED_ALTERNATIVE" />
                <!-- This is the data type we operate on. -->
                <data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
            </intent-filter>
        </activity>

        <activity android:name="NotesLiveFolder" android:label="@string/live_folder_name"
            android:icon="@drawable/live_folder_notes">
            <intent-filter>
                <action android:name="android.intent.action.CREATE_LIVE_FOLDER" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

    </application>

    <uses-sdk android:targetSdkVersion="4" android:minSdkVersion="3"/>
</manifest>