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[Android Dev] 1.1 Create Project Sunshine
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<time datetime="2017-02-06T00:00:00+01:00"><i class="fa fa-calendar"></i> Mon, 06 Feb 2017</time>
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<span class="label label-default">Series</span>
Part 1 of «Associate Android Developer Fast Track»
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目录
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<div id="toc"><ul><li><a class="toc-href" href="#1-create-project-sunshine" title="1 create project sunshine">1 create project sunshine</a><ul><li><a class="toc-href" href="#minsdk-vs-targetsdk" title="minSDK vs targetSDK">minSDK vs targetSDK</a></li><li><a class="toc-href" href="#enable-vt-x-and-installing-kvm" title="Enable VT-x and installing kvm">Enable VT-x and installing kvm</a></li><li><a class="toc-href" href="#components-of-an-android-app" title="Components of an android app">Components of an android app</a></li><li><a class="toc-href" href="#activity" title="Activity">Activity</a></li><li><a class="toc-href" href="#activities-and-layouts" title="Activities and Layouts">Activities and Layouts</a></li><li><a class="toc-href" href="#2-types-of-views" title="2 types of views">2 types of views</a><ul><li><a class="toc-href" href="#type1-ui-components-widgets" title="type1: UI components (widgets)">type1: UI components (widgets)</a></li><li><a class="toc-href" href="#type2-container-view" title="type2: container view">type2: container view</a></li></ul></li><li><a class="toc-href" href="#relate-xml-layout-to-java-activities_1" title="relate XML layout to java activities">relate XML layout to java activities</a><ul><li><a class="toc-href" href="#use-xml-layout-in-java-activity" title="use xml layout in java activity">use xml layout in java activity</a></li><li><a class="toc-href" href="#refer-to-widgets-defined-in-xml-in-java" title="refer to widgets defined in xml in java">refer to widgets defined in xml in java</a></li></ul></li></ul></li></ul></div>
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<h1 id="1-create-project-sunshine">1 create project sunshine</h1>
<p>Created 星期一 06 二月 2017</p>
<h2 id="minsdk-vs-targetsdk">minSDK vs targetSDK</h2>
<p>The <code>minSDK</code> is the lowest SDK level that your app can run on. You can choose what level of devices to support. </p>
<p>By comparison, the <code>targetSDK</code> is NOT a high pass filter -- it’s used only to declare which platform version you've tested your app on. </p>
<h2 id="enable-vt-x-and-installing-kvm">Enable VT-x and installing kvm</h2>
<p>this is necessary for running AVD devices. </p>
<p><a href="http://stackoverflow.com/questions/37087365/how-to-enable-vt-x-in-bios-and-kvm-modules-on-linux">http://stackoverflow.com/questions/37087365/how-to-enable-vt-x-in-bios-and-kvm-modules-on-linux</a></p>
<h2 id="components-of-an-android-app">Components of an android app</h2>
<p>4 main components of an app: </p>
<ul>
<li><code>Activity</code>: responsible for most user interaction</li>
<li>Service</li>
<li>ContentProvider</li>
<li>BroadcaseReceiver</li>
</ul>
<h2 id="activity">Activity</h2>
<p>Android keeps the activities in a stack, when press back button → stack pops.
Define the launcher of the activity in <code>manifests/AndroidManifest.xml</code>:</p>
<p><em>application → activity → intent-filter</em></p>
<p><img alt="" class="img-responsive" src="../images/andev_p1e1_basics//pasted_image.png"/></p>
<p><code>res</code> folder contains layouts/images/values
in <code>res/layout/activity_main.xml</code>: xml file that defines the layout view</p>
<h2 id="activities-and-layouts">Activities and Layouts</h2>
<p>An <strong>activity</strong> is a single focused thing that the user can do. Activities are responsible for creating the window that your application uses to draw and receive events from the system. Activities are written in Java, extending from the <code>Activity</code> class.</p>
<p>An activity creates <strong>views</strong> to show the user information, and to let the user interact with the activity. <code>View</code>s are a class in the Android UI framework. <em>They occupy a rectangular area on the screen and are responsible for drawing and handling events.</em> An activity determines what views to create (and where to put them), by reading an XML layout file. These XML files, are stored in the res folder inside the folder labeled <code>layouts</code>. </p>
<h2 id="2-types-of-views">2 types of views</h2>
<h3 id="type1-ui-components-widgets">type1: UI components (widgets)</h3>
<p>UI components that are often interactive elements. </p>
<p>example: <code>TextView, EditView, Buttom, ImageView,</code>...
most of UI view classes: in android.widgets package <a href="https://developer.android.com/reference/android/widget/package-summary.html">https://developer.android.com/reference/android/widget/package-summary.html</a></p>
<h3 id="type2-container-view">type2: container view</h3>
<p>The second are views called "Layout" or "Container" views. They extend from a class called <a href="https://developer.android.com/reference/android/view/ViewGroup.html">ViewGroup</a>. They are primarily responsible for containing a group of views and determining where they are on screen. Layout views can be nested in one another. </p>
<p>example: <code>LinearLayout, RelativeLayout, ConstraintLayout,</code> ...</p>
<h2 id="relate-xml-layout-to-java-activities_1">relate XML layout to java activities</h2>
<h3 id="use-xml-layout-in-java-activity">use xml layout in java activity</h3>
<p>in <code>onCreate</code> method of an activity, using the <code>setContentView(R.layout.name_of_layout)</code>
the setContentView method: Android reads your XML file and generates Java objects for each of the tags in your layout file. You can then edit these objects in the Java code by calling methods on the Java objects.</p>
<h3 id="refer-to-widgets-defined-in-xml-in-java">refer to widgets defined in xml in java</h3>
<p>in the xml file, give an id to the view:</p>
<p><img alt="" class="img-responsive" src="../images/andev_p1e1_basics//pasted_image001.png"/></p>
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Part 1 of series «Associate Android Developer Fast Track»：
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<li class="list-group-item"><a class="btn btn-primary" href='https://x-wei.github.io/andev_p1e1_basics.html' style="text-align:left">[Android Dev] 1.1 Create Project Sunshine</a></li>
<li class="list-group-item"><a class="btn btn-default" href='https://x-wei.github.io/andev_p1e2_internet.html' style="text-align:left">[Android Dev] 1.2 Connect to the Internet</a></li>
<li class="list-group-item"><a class="btn btn-default" href='https://x-wei.github.io/andev_p1e3_recyclerview.html' style="text-align:left">[Android Dev] 1.3 RecyclerView</a></li>
<li class="list-group-item"><a class="btn btn-default" href='https://x-wei.github.io/andev_p1e4_intents.html' style="text-align:left">[Android Dev] 1.4 Intents</a></li>
<li class="list-group-item"><a class="btn btn-default" href='https://x-wei.github.io/andev_p2e1_lifecycle.html' style="text-align:left">[Android Dev] 2.1 Lifecycles</a></li>
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