[实例教程] 用python开发android应用

太过爱你忘了你带给我的痛 2022-07-15 01:24 526阅读 0赞

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 <td style="word-wrap:break-word; font-size:14px"> Python是动态语言，比较简洁。Android不直接支持使用python开发应用，需要使用其它中间件或者库。PythonForAndroid提供了在android平台上对python语言的支持；CLE支持python和java之间的交互，同时提供了一个通用的接口，可用于其它多种语言。Wrapandroid project将android类封装为CLE对象，从而可以使多种语言可以调用android类。使用这三个组件，可以在android平台上直接使用python开发界面应用程序。Wrapandroid项目在进行中，目前的0.8.5版本已经提供了除SQlite，OpenGL之外大部分android类的封装。完全可以编写一个独立的python应用程序。 在android上开发python应用程序，编程和打包环境可以直接使用eclipse。 1. 准备环境 a: 安装PythonForAndroid:&nbsp;<a href="http://code.google.com/p/android-scripting" style="word-wrap:break-word; color:rgb(51,102,153)" rel="nofollow">http://code.google.com/p/android-scripting</a> b: CLE在程序运行的时候，自动从网络上安装，也可以下载库函数，放到工程中。开发需要java库文件starcore_android_r6.jar。文件在starcore_devfiles_r6.zip中，可以从<a href="http://code.google.com/p/cle-for-android" style="word-wrap:break-word; color:rgb(51,102,153)" rel="nofollow">http://code.google.com/p/cle-for-android</a>下载 c: Wrapandroid项目库文件wrapandroid.jar，包含在压缩包http:/code.google.com/p/wrapandroid-for-multilaguage/download/wrapandroid_devfiles_0_8_6.rar中。 2. 开始编程 a. 打开eclipse, 创建一个新的android project “introduction” b. 如果要从网络安装，则需要添加许可权限：&nbsp; &nbsp; &nbsp; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &nbsp; &nbsp; &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"&gt;&lt;/uses-permission&gt; c. 将库文件starcore_android_r6.jar和wrapandroid.jar到工程目录下，将这两个文件加入到工程中，如下图： <img alt="" src="http://static.bbs.miui.com/static/image/common/nophoto.gif" width="300" height="300" style="word-wrap:break-word"> d. 编辑 IntroductionActivity.java，如下修改，加载python代码 
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 import com.srplab.wrapandroid.*; 
 
 public class IntroductionActivity extends WrapAndroidActivity { &nbsp; &nbsp; /** Called when the activity is first created. */ &nbsp; &nbsp; @Override &nbsp; &nbsp; public void onCreate(Bundle savedInstanceState) { &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;super.onCreate(savedInstanceState); &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;setContentView(R.layout.main); &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;StarActivity._Call("DoAssetsFile", "python", "code.py"); &nbsp; &nbsp; } } 
 
 </blockquote> 如果不希望从网络安装CLE，可以将CLE的共享库文件包含在工程中，如下： <img alt="" src="https://img-my.csdn.net/uploads/201205/29/1338303677_1549.JPG" width="349" height="340" style="word-wrap:break-word"> 同时在activity中设置下载标志为false 
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 public class IntroductionActivity extends WrapAndroidActivity { &nbsp; &nbsp; /** Called when the activity is first created. */ &nbsp; &nbsp; @Override &nbsp; &nbsp; public void onCreate(Bundle savedInstanceState) { &nbsp; &nbsp;&nbsp;&nbsp;DownloadFromNetFlag = false; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;super.onCreate(savedInstanceState); &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;setContentView(R.layout.main); &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;StarActivity._Call("DoAssetsFile", "python", "code.py"); &nbsp; &nbsp; } } 
 
 </blockquote> 只不过此时生成的安装包大一些。 e. 编辑layout：main.xml. 
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 &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android=" 
 http://schemas.android.com/apk/res/android 
 " &nbsp; &nbsp; android:id="@+id/widget73" &nbsp; &nbsp; android:layout_width="fill_parent" &nbsp; &nbsp; android:layout_height="fill_parent" &nbsp; &nbsp; android:orientation="vertical" &gt; 
 
 &nbsp; &nbsp; &lt;TextView &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:id="@+id/widget45" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:layout_width="fill_parent" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:layout_height="wrap_content" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:text="@string/hello" /&gt;&nbsp; &nbsp; &nbsp; &lt;Button &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:id="@+id/widget74" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:layout_width="220dp" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:layout_height="48dp" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:text="thank for your use" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:typeface="serif" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:textStyle="bold" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:textColor="#ffff0000" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:layout_x="284dp" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:layout_y="220dp" &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;android:textSize="16dp" &nbsp; &nbsp; /&gt;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &lt;/LinearLayout&gt; 
 
 </blockquote> f. 在assets目录下，创建code.py文件. 3. code.py代码如下 a. 获取当前服务 
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 SrvGroup = libstarpy._GetSrvGroup() Service = SrvGroup._GetService("","") 
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 </blockquote> b. 获取当前的Activity 
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 StarActivity = Service.ActivityClass.getCurrent(); 
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 </blockquote> c. 获取layout中定义的对象 
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 MyText = StarActivity.findViewById("TextViewClass",StarActivity.getResource("id/widget45")); findViewById函数与标准的android函数有差异，主要是输入参数中增加了类的名称；类名称为android类名称，加上”Class”后缀。 MyText.setText("from layout"); 
 
 MyButton = StarActivity.findViewById("ButtonClass",StarActivity.getResource("id/widget74")); 定义button对象的点击事件 def MyButton_onClick(self, Ev) : &nbsp; &nbsp; Service.ToastClass._New().makeText("Button is click", 0).show(); MyButton.onClick = MyButton_onClick;&nbsp; &nbsp;&nbsp; MyButton.setOnClickListener(); 
 setOnClickListener与android函数有差异，不需要输入listener，事件触发之后产生给本队象。 
 
 </blockquote> d. 动态创建对象 
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 获取LinearLayout布局 MyLinearLayout = StarActivity.findViewById("LinearLayoutClass",StarActivity.getResource("id/widget73")); 
 
 创建一个动态的按钮 MyDynaButton = Service.ButtonClass._New(MyLinearLayout); def MyDynaButton_onClick(self, Ev) : &nbsp; &nbsp; Service.ToastClass._New().makeText("Button is click", 0).show(); MyDynaButton.onClick = MyDynaButton_onClick; MyDynaButton.setOnClickListener(); MyDynaButton.setText("created dynamically"); 设置按钮的布局参数 MyDynaButton.setLinearLayoutParams(100,50); 
 
 </blockquote> 、http://www.miui.com/thread-995114-1-1.html </td> 
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