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android开发教程第一季笔记.html
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<!DOCTYPE html>
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<meta property="og:description" content="S01E02: 开发环境搭建 直接去 developer.android.com/sdk/ 下载bundle解压即可, 里面包含eclipse 新建一个模拟器: 内部存储一般64MB足矣: S01E03: android项目目录结构 第一个android程序 new-->android application 目录结构 com.example.helloworld这个包名一般为网址倒着写, android是按照包名来区分不同APP的 src/目录下存放java程序 gen/目录下存放系统自动生成的文件, R.java里给每一个控件或变量赋予一个id, 千万__不要手动修改R,.java内容__!! assets/目录下和res/目录下都可以放各种外部文件(ex. 图片), 但是assets下的文件不会在R.java中生成id res/layout/ 存放布局文件(xml格式) AndroidManifest.xml用于统筹 S01E04: 技术结构 四层结构图 开发位于最上层application 基于组件的应用程序开发 搭积木 常见组件 ..."/>
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android开发视频教程(重制版) 第一季 课程笔记
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<time datetime="2013-07-31T00:00:00+02:00"><i class="fa fa-calendar"></i> Wed, 31 Jul 2013</time>
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<div id="toc"><ul><li><a class="toc-href" href="#s01e02-kai-fa-huan-jing-da-jian" title="S01E02: 开发环境搭建">S01E02: 开发环境搭建</a></li><li><a class="toc-href" href="#s01e03-androidxiang-mu-mu-lu-jie-gou" title="S01E03: android项目目录结构">S01E03: android项目目录结构</a><ul><li><a class="toc-href" href="#di-yi-ge-androidcheng-xu" title="第一个android程序">第一个android程序</a></li><li><a class="toc-href" href="#mu-lu-jie-gou" title="目录结构">目录结构</a></li></ul></li><li><a class="toc-href" href="#s01e04-ji-zhu-jie-gou_1" title="S01E04: 技术结构">S01E04: 技术结构</a><ul><li><a class="toc-href" href="#si-ceng-jie-gou-tu" title="四层结构图">四层结构图</a></li><li><a class="toc-href" href="#ji-yu-zu-jian-de-ying-yong-cheng-xu-kai-fa" title="基于组件的应用程序开发">基于组件的应用程序开发</a></li><li><a class="toc-href" href="#chang-jian-zu-jian" title="常见组件">常见组件</a></li></ul></li><li><a class="toc-href" href="#s01e05-activitychu-bu_1" title="S01E05: activity初步">S01E05: activity初步</a><ul><li><a class="toc-href" href="#activityqi-dong-ji-ben-liu-cheng" title="Activity启动基本流程">Activity启动基本流程</a></li><li><a class="toc-href" href="#activityyu-bu-ju-wen-jian" title="Activity与布局文件">Activity与布局文件</a></li><li><a class="toc-href" href="#zai-activitydang-zhong-huo-qu-dai-biao-kong-jian-dui-xiang" title="在Activity当中获取代表控件对象">在Activity当中获取代表控件对象</a></li></ul></li><li><a class="toc-href" href="#s01e06-view_1" title="S01E06: View">S01E06: View</a><ul><li><a class="toc-href" href="#viewde-ji-ben-gai-nian" title="View的基本概念">View的基本概念</a></li><li><a class="toc-href" href="#wei-yi-ge-viewbang-ding-jian-ting-qi" title="为一个View绑定监听器">为一个View绑定监听器</a></li></ul></li><li><a class="toc-href" href="#s01e07-bu-ju_1" title="S01E07: 布局">S01E07: 布局</a></li><li><a class="toc-href" href="#s01e08-ju-chi-dan-wei-bian-ju" title="S01E08: 距离单位; 边距">S01E08: 距离单位; 边距</a><ul><li><a class="toc-href" href="#ju-chi-dan-wei-px-dp-sp" title="距离单位: px, dp, sp">距离单位: px, dp, sp</a></li><li><a class="toc-href" href="#nei-wai-bian-ju-margin-padding" title="内外边距: margin, padding">内外边距: margin, padding</a></li><li><a class="toc-href" href="#s01e09-checkboxduo-xuan-kuang_1" title="S01E09: CheckBox多选框">S01E09: CheckBox多选框</a></li><li><a class="toc-href" href="#s01e10-dan-xuan-kuang-radiobutton" title="S01E10: 单选框RadioButton">S01E10: 单选框RadioButton</a><ul><li><a class="toc-href" href="#radiogroup" title="RadioGroup">RadioGroup</a></li><li><a class="toc-href" href="#radiogroupde-oncheckedchangelistener" title="RadioGroup的OnCheckedChangeListener">RadioGroup的OnCheckedChangeListener</a></li></ul></li></ul></li><li><a class="toc-href" href="#s01e11-xian-shi-tu-pian-imageview_2" title="S01E11: 显示图片ImageView">S01E11: 显示图片ImageView</a><ul><li><a class="toc-href" href="#cha-tu-de-fang-fa" title="插图的方法">插图的方法</a></li><li><a class="toc-href" href="#scaletype" title="ScaleType">ScaleType</a></li></ul></li><li><a class="toc-href" href="#s01e12-xian-xing-bu-ju-shen-ru_1" title="S01E12: 线性布局深入">S01E12: 线性布局深入</a><ul><li><a class="toc-href" href="#xian-xing-bu-ju-qian-tao" title="线性布局嵌套">线性布局嵌套</a></li><li><a class="toc-href" href="#layout_weight" title="layout_weight">layout_weight</a></li></ul></li><li><a class="toc-href" href="#s01e13-xiang-dui-bu-ju-i_1" title="S01E13: 相对布局-I">S01E13: 相对布局-I</a><ul><li><a class="toc-href" href="#xiang-dui-bu-ju-def" title="相对布局def">相对布局def</a></li><li><a class="toc-href" href="#ji-ben-si-lu" title="基本思路">基本思路</a></li><li><a class="toc-href" href="#shi-xian-fang-fa" title="实现方法">实现方法</a></li></ul></li><li><a class="toc-href" href="#s01e14-xiang-dui-bu-ju-ii_1" title="S01E14: 相对布局II">S01E14: 相对布局II</a><ul><li><a class="toc-href" href="#dui-qi-dao-ji-zhun-xian" title="对齐到基准线">对齐到基准线</a></li><li><a class="toc-href" href="#he-fu-kong-jian-dui-qi" title="和父控件对齐">和父控件对齐</a></li></ul></li><li><a class="toc-href" href="#s01e15-xiang-dui-bu-ju-iii_1" title="S01E15: 相对布局III">S01E15: 相对布局III</a><ul><li><a class="toc-href" href="#relativelayoutbu-ju-de-xin-shu-xing-android-42" title="RelativeLayout布局的新属性(Android 4.2)">RelativeLayout布局的新属性(Android 4.2)</a></li><li><a class="toc-href" href="#xiang-dui-bu-ju-xiao-lian-xi" title="相对布局小练习">相对布局小练习</a></li></ul></li><li><a class="toc-href" href="#s01e16-shi-jian-he-ri-qi-timepickerdatepicker_1" title="S01E16: 时间和日期 TimePicker/DatePicker">S01E16: 时间和日期 TimePicker/DatePicker</a></li><li><a class="toc-href" href="#s01e17-jin-du-tiao-progressbar" title="S01E17: 进度条ProgressBar">S01E17: 进度条ProgressBar</a><ul><li><a class="toc-href" href="#ge-chong-jin-du-tiao" title="各种进度条">各种进度条</a></li><li><a class="toc-href" href="#jin-du-tiao-de-shu-xing" title="进度条的属性">进度条的属性</a></li></ul></li><li><a class="toc-href" href="#s01e18-seekbarhe-ratingbar_1" title="S01E18: SeekBar和RatingBar">S01E18: SeekBar和RatingBar</a><ul><li><a class="toc-href" href="#seekbar" title="SeekBar">SeekBar</a></li><li><a class="toc-href" href="#ratingbar" title="RatingBar">RatingBar</a></li></ul></li></ul></div>
</div>
</div>
<h1 id="s01e02-kai-fa-huan-jing-da-jian">S01E02: 开发环境搭建</h1>
<ul>
<li>直接去 developer.android.com/sdk/ 下载bundle解压即可, 里面包含eclipse</li>
<li>新建一个模拟器: 内部存储一般64MB足矣:</li>
</ul>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image002.png"/></p>
<h1 id="s01e03-androidxiang-mu-mu-lu-jie-gou">S01E03: android项目目录结构</h1>
<h4 id="di-yi-ge-androidcheng-xu">第一个android程序</h4>
<p>new-->android application</p>
<h4 id="mu-lu-jie-gou">目录结构</h4>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image003.png"/></p>
<ul>
<li>com.example.helloworld这个包名一般为网址倒着写, android是按照包名来区分不同APP的</li>
<li>src/目录下存放java程序</li>
<li>gen/目录下存放系统自动生成的文件, R.java里给每一个控件或变量赋予一个id, 千万__不要手动修改R,.java内容__!!</li>
<li>assets/目录下和res/目录下都可以放各种外部文件(ex. 图片), 但是assets下的文件不会在R.java中生成id</li>
<li>res/layout/ 存放布局文件(xml格式)</li>
<li>AndroidManifest.xml用于统筹</li>
</ul>
<h1 id="s01e04-ji-zhu-jie-gou_1">S01E04: 技术结构</h1>
<h4 id="si-ceng-jie-gou-tu">四层结构图</h4>
<p>开发位于最上层application
<img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image004.png"/></p>
<h4 id="ji-yu-zu-jian-de-ying-yong-cheng-xu-kai-fa">基于组件的应用程序开发</h4>
<p>搭积木</p>
<h4 id="chang-jian-zu-jian">常见组件</h4>
<ul>
<li>activity(负责用户交互); </li>
<li>service(后台处理数据); </li>
<li>Content Provider(对外提供数据); </li>
<li>BroadcastReceiver(接收broadcast)</li>
</ul>
<h1 id="s01e05-activitychu-bu_1">S01E05: activity初步</h1>
<h4 id="activityqi-dong-ji-ben-liu-cheng">Activity启动基本流程</h4>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image006.png"/></p>
<ul>
<li>AndroidManifest.xml里面指定, 程序运行后执行MainActivity.java</li>
<li>MainActivity.java的onCreate()函数里setContentView(R.layout.activity_main); 读取activity_main.xml文件并显示</li>
</ul>
<h4 id="activityyu-bu-ju-wen-jian">Activity与布局文件</h4>
<p>一一对应 (eclipse编辑器里有图形化预览界面)</p>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image007.png"/></p>
<h4 id="zai-activitydang-zhong-huo-qu-dai-biao-kong-jian-dui-xiang">在Activity当中获取代表控件对象</h4>
<ul>
<li>
<p>首先在activity_main.xml里定义控件时, 为其指定一个id: </p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="n">android</span><span class="o">:</span><span class="n">id</span><span class="o">=</span><span class="s2">"@+id/textView1"</span> <span class="o">(</span><span class="s2">"+id"</span><span class="err">表示新建一个</span><span class="n">id</span><span class="o">)</span></span>
</pre></div>
</li>
<li>
<p>→ 自动在R.java里生成一个id:</p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="err">public static final class id {</span></span>
<span class="code-line"><span class="err"> public static final int textView1=0x7f080003;</span></span>
<span class="code-line"><span class="err"> }</span></span>
</pre></div>
</li>
<li>
<p>→ 之后在MainActivity.java里, 先声明成员变量:</p>
</li>
</ul>
<p>private TextView tv</p>
<ul>
<li>
<p>→ 在onCreate()中, 通过id获得这个控件对象:</p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="err">tv = (TextView) findViewById(R.id.textView1);//有向下转型: TextView是View的子类</span></span>
</pre></div>
</li>
<li>
<p>→ 之后就可以调用tv的各种方法了,具体见SDK里的文档i(android.widget.TextView), 从而实现再java程序里动态修改控件属性.</p>
</li>
</ul>
<h1 id="s01e06-view_1">S01E06: View</h1>
<h4 id="viewde-ji-ben-gai-nian">View的基本概念</h4>
<p>View是一个控件?...</p>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image008.png"/></p>
<h4 id="wei-yi-ge-viewbang-ding-jian-ting-qi">为一个View绑定监听器</h4>
<p>(我就认为View是一个控件了)</p>
<ol>
<li>
<p>java程序里获取控件代表的对象: findViewById()方法</p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="err">bt = (Button) findViewById(R.id.button1);</span></span>
</pre></div>
</li>
<li>
<p>定义一个<strong>内部类</strong> 实现监听器接口:</p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="err">// **使用一个内部类定义监听器**</span></span>
<span class="code-line"><span class="err">// Button的监听器 实现OnClickListener接口, OnClickListener接口是处理点击事件的</span></span>
<span class="code-line"><span class="err">class ButtonListener implements OnClickListener {</span></span>
<span class="code-line"><span class="err">@Override</span></span>
<span class="code-line"><span class="err">// 实现该接口的抽象方法onClick</span></span>
<span class="code-line"><span class="err">public void onClick(View v) {</span></span>
<span class="code-line"><span class="err">//do something......</span></span>
<span class="code-line"><span class="err">}</span></span>
<span class="code-line"><span class="err">}// end 内部类ButtonListener</span></span>
</pre></div>
</li>
<li>
<p>onCreate()里生成一个监听器对象, 并为控件绑定该监听器</p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="err">ButtonListener bl = new ButtonListener();// 生成一个监听器对象</span></span>
<span class="code-line"><span class="err">bt.setOnClickListener(bl);// **这句话把监听器和事件联系在一起了** 点击这个按钮 就会执行它的onclick方法</span></span>
</pre></div>
</li>
<li>
<p>一个监听器可以绑定给多个控件</p>
</li>
<li><strong>另法</strong></li>
</ol>
<p>可以直接写在setOnClickListener参数里, 不用给内部类起名字: </p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="err"> bt.setOnClickListener(new OnClickListener() {</span></span>
<span class="code-line"><span class="err"> @Override</span></span>
<span class="code-line"><span class="err"> public void onClick(View v) {</span></span>
<span class="code-line"><span class="err"> //do something......</span></span>
<span class="code-line"><span class="err"> }</span></span>
<span class="code-line"><span class="err"> });</span></span>
</pre></div>
<h1 id="s01e07-bu-ju_1">S01E07: 布局</h1>
<ul>
<li>所谓的控件布局方法,就是指控制控件在Activity当中的位置、大小、颜色以及其他控件样式属性的方法。</li>
<li>布局可以用xml布局文件(ex. /res/layout/activity_main.xml) 也可以在java文件里完成控件布局</li>
<li>最常用: 线性布局LinearLayout, 相对布局RelativeLayout</li>
<li>先暂时用线性布局LinearLayout, 最简单</li>
</ul>
<h1 id="s01e08-ju-chi-dan-wei-bian-ju">S01E08: 距离单位; 边距</h1>
<h4 id="ju-chi-dan-wei-px-dp-sp">距离单位: px, dp, sp</h4>
<ul>
<li><strong>px</strong>=像素点</li>
</ul>
<p>使用px指定控件大小, 则不同分辨率手机显示结果不同, 非常麻烦.</p>
<ul>
<li>dpi计算公式:</li>
</ul>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image009.png"/></p>
<ul>
<li><strong>dp</strong>=dip(Device Independent pixels) 是设备无关的像素单位</li>
</ul>
<p>换算公式<code>px = dp * (dpi / 160)</code> </p>
<p>在320*480的屏幕上, dp与px相等 </p>
<p><strong>总之一般指定控件大小就用dp</strong></p>
<ul>
<li><strong>sp</strong>=scaled pixels 可改变大小的像素单位</li>
</ul>
<p>当用户修改手机显示字体时,sp会随之改变</p>
<p><strong>sp单位通常用于指定字体的大小</strong></p>
<h4 id="nei-wai-bian-ju-margin-padding">内外边距: margin, padding</h4>
<ul>
<li>margin: 控件离其他控件的距离</li>
<li>padding: 控件内容离控件边框的距离</li>
</ul>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image010.png"/></p>
<ul>
<li>设置内边距与外边距:</li>
</ul>
<p>layout_margin, layout_marginTop, ...
padding, paddingTop, ...</p>
<h2 id="s01e09-checkboxduo-xuan-kuang_1">S01E09: CheckBox多选框</h2>
<p>效果:
<img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image011.png"/></p>
<ul>
<li>布局文件里使用<checkbox></checkbox>标签</li>
<li>OnClickListener与OnCheckedChangeListener监听器</li>
</ul>
<p><strong>注意</strong> 这俩监听器是有一定区别的, OnClickListener必须是用户点击才能触发, OnCheckedChangeListener则是只要状态改变了(即使是由程序里改变的)就会触发</p>
<ul>
<li>可以几个CheckBox绑定上同一个监听器</li>
<li>OnClickListener接口的方法: public void onClick(View v) 有一个<strong>参数View v</strong>, 指的是是哪个控件被点击了, </li>
</ul>
<p>在onClick()中要处理这个控件时, 使用:<code>CheckBox cb = (CheckBox) v;</code>
得到这个控件对象, 或者通过其<code>id: v.getId()</code>也可以</p>
<h2 id="s01e10-dan-xuan-kuang-radiobutton">S01E10: 单选框RadioButton</h2>
<p>效果: </p>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image013.png"/></p>
<h4 id="radiogroup">RadioGroup</h4>
<p>单选按钮RadioButton需要放在一个RadioGroup中</p>
<p>xml代码:</p>
<div class="highlight"><pre><span class="code-line"><span></span> <span class="nt"><RadioGroup</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/radioGroupId"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"0dp"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_gravity=</span><span class="s">"center"</span></span>
<span class="code-line"> <span class="na">android:orientation=</span><span class="s">"vertical"</span> </span>
<span class="code-line"> <span class="na">android:layout_weight=</span><span class="s">"1"</span><span class="nt">></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><RadioButton</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/radioButton_h"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:text=</span><span class="s">"homme"</span> <span class="nt">/></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><RadioButton</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/radioButton_f"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:text=</span><span class="s">"femmee"</span> <span class="nt">/></span></span>
<span class="code-line"><span class="nt"></RadioGroup></span></span>
<span class="code-line"><span class="c"><!-- 像RadioGroup这样写的xml标签可以拥有子标签, 而像RadioButton这种则不能 →</span></span>
</pre></div>
<h4 id="radiogroupde-oncheckedchangelistener">RadioGroup的OnCheckedChangeListener</h4>
<p>有俩参数... (RadioGroup group, int checkedId)</p>
<p>直接上代码吧: </p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="k">class</span><span class="w"> </span><span class="n">RadioGroupListener</span><span class="w"> </span><span class="n">implements</span><span class="w"></span></span>
<span class="code-line"><span class="n">android</span><span class="p">.</span><span class="n">widget</span><span class="p">.</span><span class="n">RadioGroup</span><span class="p">.</span><span class="n">OnCheckedChangeListener</span><span class="w"> </span><span class="err">{</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="nv">@Override</span><span class="w"></span></span>
<span class="code-line"><span class="o">//</span><span class="w"> </span><span class="n">注意看这俩参数</span><span class="err">!</span><span class="w"></span></span>
<span class="code-line"><span class="k">public</span><span class="w"> </span><span class="n">void</span><span class="w"> </span><span class="n">onCheckedChanged</span><span class="p">(</span><span class="n">RadioGroup</span><span class="w"> </span><span class="k">group</span><span class="p">,</span><span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="n">checkedId</span><span class="p">)</span><span class="w"> </span><span class="err">{</span><span class="o">//</span><span class="w"> </span><span class="n">checkedId是被选择的哪个RadioButton的Id</span><span class="w"> </span><span class="p">(</span><span class="n">而不是什么序号</span><span class="p">)</span><span class="w"></span></span>
<span class="code-line"><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">checkedId</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">R</span><span class="p">.</span><span class="n">id</span><span class="p">.</span><span class="n">radioButton_h</span><span class="p">)</span><span class="o">//</span><span class="w"> </span><span class="nl">用两种方法得到想要的id</span><span class="p">:</span><span class="w"> </span><span class="mf">1.</span><span class="w"> </span><span class="n">使用R中定义的</span><span class="w"></span></span>
<span class="code-line"><span class="err">{</span><span class="w"></span></span>
<span class="code-line"><span class="n">tv3</span><span class="p">.</span><span class="n">setText</span><span class="p">(</span><span class="ss">"Homme!"</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="n">rb_h2</span><span class="p">.</span><span class="n">setChecked</span><span class="p">(</span><span class="k">true</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="err">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">checkedId</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">rb_f</span><span class="p">.</span><span class="n">getId</span><span class="p">())</span><span class="o">//</span><span class="w"> </span><span class="mf">2.</span><span class="w"> </span><span class="n">使用getid</span><span class="p">()</span><span class="n">方法</span><span class="w"></span></span>
<span class="code-line"><span class="err">{</span><span class="w"></span></span>
<span class="code-line"><span class="n">tv3</span><span class="p">.</span><span class="n">setText</span><span class="p">(</span><span class="ss">"Femme!"</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="n">rb_f2</span><span class="p">.</span><span class="n">setChecked</span><span class="p">(</span><span class="k">true</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
</pre></div>
<h1 id="s01e11-xian-shi-tu-pian-imageview_2">S01E11: 显示图片ImageView</h1>
<h4 id="cha-tu-de-fang-fa">插图的方法</h4>
<ul>
<li>把图片放在./res/drawable 里面(有好几个分辨率的drawable, 随便一个...), ex. 放在了./res/drawable-hdpi/pic.jpg</li>
<li>→ 会在R.java里生成其<code>id: pic</code></li>
<li>在xml中使用<imageview></imageview>标签</li>
</ul>
<p>引用放好的图:
<code>android:src="@drawable/pic"</code></p>
<h4 id="scaletype">ScaleType</h4>
<p>ScaleType属性控制图片缩放的尺寸, 有几个可选: </p>
<ul>
<li>fitcenter等比例缩放并居中显示; </li>
<li>fitstart靠上显示; </li>
<li>center 若图片较大则把中央部分截取出来显示,不缩放若图片小则直接居中显示, 也不缩放 </li>
<li>centerCrop 缩放并进行裁剪以适应ImiageView</li>
<li>centerInside 要是图片大就缩放放进去, 图片小就不缩放直接放进去</li>
<li>Fit_XY缩放成和ImageView一样大</li>
</ul>
<p><strong>代码片段: </strong></p>
<div class="highlight"><pre><span class="code-line"><span></span><span class="err"><ImageView</span></span>
<span class="code-line"><span class="err"> android:id="@+id/imageView1Id"</span></span>
<span class="code-line"><span class="err"> android:layout_width="60dp"</span></span>
<span class="code-line"><span class="err"> android:layout_height="70dp"</span></span>
<span class="code-line"><span class="err"> android:background="#FF0000"</span></span>
<span class="code-line"><span class="err"> android:scaleType="fitCenter"</span></span>
<span class="code-line"><span class="err"> android:layout_weight="1"</span></span>
<span class="code-line"><span class="err"> android:src="@drawable/pic" /></span></span>
<span class="code-line"><span class="err"><!-- "@drawable/pic"是对应于R.drawable.pic, 实际上图片也可以放在assets文件夹 或者网络上 或者SD卡上 都可以, 不过以后再用 --></span></span>
</pre></div>
<h1 id="s01e12-xian-xing-bu-ju-shen-ru_1">S01E12: 线性布局深入</h1>
<h4 id="xian-xing-bu-ju-qian-tao">线性布局嵌套</h4>
<ul>
<li>在LinearLayout里面再加入LinearLayout</li>
<li>"直接父/子控件"</li>
<li>嵌套层数没有限制</li>
</ul>
<h4 id="layout_weight">layout_weight</h4>
<ul>
<li>子控件并未占满父控件的所有空间时才有用</li>
<li>layout_weight的值用于指定<strong>空闲空间的</strong>分配__比例__: weight都是1的话--是按比例平分父控件的__剩余(!!!)__空间, 而不是整个父控件被按比例分配!</li>
<li>如果想让父控件按比例分配: 很简单, __把宽度改为0dp__即可(那么父控件剩余空间=父控件总空间!)</li>
<li>使用了线性布局嵌套以及weight属性, 已经可以制作一些相对较复杂的布局了</li>
</ul>
<h1 id="s01e13-xiang-dui-bu-ju-i_1">S01E13: 相对布局-I</h1>
<h4 id="xiang-dui-bu-ju-def">相对布局def</h4>
<ul>
<li>相对布局是通过指定当前控件__与兄弟控件或者是父控件之间的相对位置__,从而达到控制控件位置的目的 </li>
<li>实现同样界面, 用相对布局比用线性布局简单--<strong>UI性能</strong>更好些</li>
<li>UI性能: 布局嵌套越多, 性能越差!!...</li>
</ul>
<h4 id="ji-ben-si-lu">基本思路</h4>
<ul>
<li>未指定位置时: 默认往左上角放(可能会重叠!)</li>
<li>可以先放一个控件, 然后第二个控件指定其相对位置</li>
</ul>
<h4 id="shi-xian-fang-fa">实现方法</h4>
<ul>
<li>android:layout_below/layout_above等等等等... 放置在其左(右)边; 属性的值都是其他控件的id</li>
<li>android:id="@+id/tvv1"是创建一个新id; android:layout_toRightOf="@id/tvv1"则是引用已有的id(没有加号)</li>
<li>android:layout_alignLeft/Right等等等等..... 左(右)对齐; 属性的值都是其他控件的id </li>
</ul>
<h1 id="s01e14-xiang-dui-bu-ju-ii_1">S01E14: 相对布局II</h1>
<h4 id="dui-qi-dao-ji-zhun-xian">对齐到基准线</h4>
<ul>
<li>基准线:为了保证印刷字母的整齐而划定的线 </li>
</ul>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image.png"/></p>
<p>第三条线就是所谓的基准线(baseline)</p>
<ul>
<li>ex. 两个TextView__的基准线__相互对齐</li>
<li>作用: 当俩TextView的字体大小不相同时...</li>
</ul>
<p>看图:</p>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image001.png"/></p>
<h4 id="he-fu-kong-jian-dui-qi">和父控件对齐</h4>
<ul>
<li>android:layout_alignParentLeft/Right等等... 属性的值为true/false(因为只有一个直接父控件)</li>
<li>android:layout_centerInParent/layout_centerHorizontal等等...</li>
</ul>
<h1 id="s01e15-xiang-dui-bu-ju-iii_1">S01E15: 相对布局III</h1>
<h4 id="relativelayoutbu-ju-de-xin-shu-xing-android-42">RelativeLayout布局的新属性(Android 4.2)</h4>
<ul>
<li>android:layout_alignStart/End等 值是其他控件的id, 头部和尾部对齐</li>
<li>android:layout_alignParentStart/End, 值是true/false</li>
</ul>
<h4 id="xiang-dui-bu-ju-xiao-lian-xi">相对布局小练习</h4>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image014.png"/></p>
<p><strong>代码片段:</strong> </p>
<div class="highlight"><pre><span class="code-line"><span></span> <span class="nt"><RelativeLayout</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/RL0"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"fill_parent"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"fill_parent"</span> <span class="nt">></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><TextView</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/tv1"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_centerHorizontal=</span><span class="s">"true"</span></span>
<span class="code-line"> <span class="na">android:gravity=</span><span class="s">"center"</span></span>
<span class="code-line"> <span class="na">android:text=</span><span class="s">"login..."</span></span>
<span class="code-line"> <span class="na">android:textSize=</span><span class="s">"16sp"</span> <span class="nt">/></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><EditText</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/editText1"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_below=</span><span class="s">"@id/tv1"</span></span>
<span class="code-line"> <span class="na">android:layout_centerHorizontal=</span><span class="s">"true"</span></span>
<span class="code-line"> <span class="na">android:ems=</span><span class="s">"10"</span></span>
<span class="code-line"> <span class="na">android:hint=</span><span class="s">"username"</span> <span class="nt">></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><requestFocus</span> <span class="nt">/></span></span>
<span class="code-line"> <span class="nt"></EditText></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><EditText</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/editText2"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_below=</span><span class="s">"@id/editText1"</span></span>
<span class="code-line"> <span class="na">android:layout_centerHorizontal=</span><span class="s">"true"</span></span>
<span class="code-line"> <span class="na">android:ems=</span><span class="s">"10"</span></span>
<span class="code-line"> <span class="na">android:hint=</span><span class="s">"password"</span></span>
<span class="code-line"> <span class="na">android:inputType=</span><span class="s">"textPassword"</span> <span class="nt">/></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><Button</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/button1"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_alignParentRight=</span><span class="s">"true"</span></span>
<span class="code-line"> <span class="na">android:layout_below=</span><span class="s">"@+id/editText2"</span></span>
<span class="code-line"> <span class="na">android:text=</span><span class="s">"login"</span> <span class="nt">/></span></span>
<span class="code-line"></span>
<span class="code-line"> <span class="nt"><Button</span></span>
<span class="code-line"> <span class="na">android:id=</span><span class="s">"@+id/button2"</span></span>
<span class="code-line"> <span class="na">android:layout_width=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_height=</span><span class="s">"wrap_content"</span></span>
<span class="code-line"> <span class="na">android:layout_below=</span><span class="s">"@+id/editText2"</span></span>
<span class="code-line"> <span class="na">android:layout_toLeftOf=</span><span class="s">"@+id/button1"</span></span>
<span class="code-line"> <span class="na">android:text=</span><span class="s">"cancel"</span> <span class="err">[</span><span class="nt">/></span>](file:///%3E)</span>
<span class="code-line"> <span class="nt"></RelativeLayout></span></span>
</pre></div>
<h1 id="s01e16-shi-jian-he-ri-qi-timepickerdatepicker_1">S01E16: 时间和日期 TimePicker/DatePicker</h1>
<ul>
<li><timepicker></timepicker> <datepicker></datepicker>标签</li>
<li>文档: android.widget.TimePicker/android.widget.DatePicker</li>
<li>OnTimeChangedListener的onTimeChanged函数: public void onTimeChanged(TimePicker view, int hourOfDay, int minute) 仨参数</li>
<li>getCurrentHour(); getCurrentMinute(); getMonth(); getDayOfMonth()等函数, 同理有set函数......</li>
<li>注意月份是从零算起!!</li>
<li>setIs24HourView() 切换24小时显示</li>
</ul>
<h1 id="s01e17-jin-du-tiao-progressbar">S01E17: 进度条ProgressBar</h1>
<h4 id="ge-chong-jin-du-tiao">各种进度条</h4>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image015.png"/></p>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image016.png"/></p>
<h4 id="jin-du-tiao-de-shu-xing">进度条的属性</h4>
<ul>
<li>风格Style: 转圈圈: 垂直风格(默认); 一条线的进度条: Horizontal</li>
<li>最大值: max</li>
<li>当前进度:progress</li>
<li>次要进度的值:SecondaryProgress (ex.次要进度: 解压缩文件时, 在线看视频时...)</li>
<li>isIndeterminate()断进度条时不时不明确的(打酱油的, 比如转圈圈), 同理有set方法, 不过只能对水平风格适用.</li>
</ul>
<h1 id="s01e18-seekbarhe-ratingbar_1">S01E18: SeekBar和RatingBar</h1>
<h4 id="seekbar">SeekBar</h4>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image017.png"/></p>
<ul>
<li>属性: max/progress/</li>
<li>监听器接口OnSeekBarChangeListener有三个函数要重写: <div class="highlight"><pre><span class="code-line"><span></span><span class="k">class</span><span class="w"> </span><span class="n">SeekBarListener</span><span class="w"> </span><span class="n">implements</span><span class="w"> </span><span class="n">OnSeekBarChangeListener</span><span class="err">{</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="cm">/**</span></span>
<span class="code-line"></span>
<span class="code-line"><span class="cm">* seekBar 该对象指的是触发了监听器的SeekBar对象</span></span>
<span class="code-line"><span class="cm">* progress 指的是当前SeekBar的进度</span></span>
<span class="code-line"><span class="cm">* fromUser 指是不是用户手动改变的进度</span></span>
<span class="code-line"></span>
<span class="code-line"><span class="cm"> */</span><span class="w"></span></span>
<span class="code-line"><span class="nv">@Override</span><span class="w"></span></span>
<span class="code-line"><span class="k">public</span><span class="w"> </span><span class="n">void</span><span class="w"> </span><span class="n">onProgressChanged</span><span class="p">(</span><span class="n">SeekBar</span><span class="w"> </span><span class="n">SeekBar</span><span class="p">,</span><span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="n">progress</span><span class="p">,</span><span class="w"> </span><span class="k">boolean</span><span class="w"> </span><span class="n">fromUser</span><span class="p">)</span><span class="w"> </span><span class="err">{</span><span class="w"></span></span>
<span class="code-line"><span class="k">System</span><span class="p">.</span><span class="k">out</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="ss">"progress:"</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">progress</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="ss">",fromUser:"</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">fromUser</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="nv">@Override</span><span class="w"></span></span>
<span class="code-line"><span class="k">public</span><span class="w"> </span><span class="n">void</span><span class="w"> </span><span class="n">onStartTrackingTouch</span><span class="p">(</span><span class="n">SeekBar</span><span class="w"> </span><span class="n">seekBar</span><span class="p">)</span><span class="w"> </span><span class="err">{</span><span class="w"></span></span>
<span class="code-line"><span class="k">System</span><span class="p">.</span><span class="k">out</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="ss">"onStart"</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="nv">@Override</span><span class="w"></span></span>
<span class="code-line"><span class="k">public</span><span class="w"> </span><span class="n">void</span><span class="w"> </span><span class="n">onStopTrackingTouch</span><span class="p">(</span><span class="n">SeekBar</span><span class="w"> </span><span class="n">seekBar</span><span class="p">)</span><span class="w"> </span><span class="err">{</span><span class="w"></span></span>
<span class="code-line"><span class="k">System</span><span class="p">.</span><span class="k">out</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="ss">"onStop"</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
</pre></div>
</li>
</ul>
<h4 id="ratingbar">RatingBar</h4>
<p><img alt="" class="img-responsive" src="../images/./android开发教程第一季笔记/pasted_image018.png"/></p>
<ul>
<li>属性: numStars(星星个数), progress, stepSize(步进)</li>
<li>监听器代码:<div class="highlight"><pre><span class="code-line"><span></span><span class="k">class</span><span class="w"> </span><span class="n">RatingBarListener</span><span class="w"> </span><span class="n">implements</span><span class="w"> </span><span class="n">OnRatingBarChangeListener</span><span class="err">{</span><span class="w"></span></span>
<span class="code-line"></span>
<span class="code-line"><span class="nv">@Override</span><span class="w"></span></span>
<span class="code-line"><span class="k">public</span><span class="w"> </span><span class="n">void</span><span class="w"> </span><span class="n">onRatingChanged</span><span class="p">(</span><span class="n">RatingBar</span><span class="w"> </span><span class="n">ratingBar</span><span class="p">,</span><span class="w"> </span><span class="nc">float</span><span class="w"> </span><span class="n">rating</span><span class="p">,</span><span class="w"> </span><span class="k">boolean</span><span class="w"> </span><span class="n">fromUser</span><span class="p">)</span><span class="w"> </span><span class="err">{</span><span class="w"></span></span>
<span class="code-line"><span class="k">System</span><span class="p">.</span><span class="k">out</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="ss">"rating:"</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">rating</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="ss">",fromUser:"</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">fromUser</span><span class="p">);</span><span class="w"></span></span>
<span class="code-line"><span class="err">}</span><span class="w"></span></span>
</pre></div>
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