Android Studio插件开发-SteadyoungIOC注解生成器:Steadyoung-CodePlug

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前言

上一篇文章我已经分享了自己简易打造的IOC注解框架:SteadyoungIOC。留下了文中快速生成代码的插件未解析,今天就来一步步为大家解析这个插件的开发过程。首先为接触过android Studio插件开发的同学可以先阅读:学会编写Android Studio插件 别停留在用的程度了

简书原文地址:Android Studio插件开发-SteadyoungIOC注解生成器:Steadyoung-CodePlug

分析

下面看看上期中自动生成代码的效果:


Alt+Insert 智能插入

steadyoungioc.gif
自动生成注解代码,跟ButterKnife的插件类似,但是我们自己写的插件生成的注解代码更加符合google源码规范,而且是基于我们 自己简易打造的IOC注解框架:SteadyoungIOC 。我参考了ButterKnife的源码,因为源码过于复杂,为了提高上手度,只引用了部分功能。
我们先来整理一下思路,要实现这么个插件我们需要做一些什么东东:

  • 获取光标所在行的布局文件 --> R.layout.xxxx.xml;
  • 搜索整个项目获取到R.layout.xxxx.xml文件;
  • 通过该布局文件去遍历找出含有id的布局标签,当然如果考虑完善一点需要考虑include等等;
  • 遍历完成后生成对话框,让用户可以自己选择需要生成注解的View以及点击事件,这个是Java GUI里面的内容
  • 最后当用户点击确定生成最终的注解代码即可
    这么说起来还是挺简单的,当然其中的细节还是让人很蛋疼的,需要不断反复的调试。

实现

  • 获取光标所在行的布局文件 --> R.layout.xxxx.xml;
    /**
     * 获取当前光标的layout文件
     */
    private String getCurrentLayout(Editor editor) 
        Document document = editor.getDocument();
        CaretModel caretModel = editor.getCaretModel();
        int caretOffset = caretModel.getOffset();
        int lineNum = document.getLineNumber(caretOffset);
        int lineStartOffset = document.getLineStartOffset(lineNum);
        int lineEndOffset = document.getLineEndOffset(lineNum);
        String lineContent = document.getText(new TextRange(lineStartOffset, lineEndOffset));
        String layoutMatching = "R.layout.";
        if (!TextUtils.isEmpty(lineContent) && lineContent.contains(layoutMatching)) 
            // 获取layout文件的字符串
            int startPosition = lineContent.indexOf(layoutMatching) + layoutMatching.length();
            int endPosition = lineContent.indexOf(")", startPosition);
            String layoutStr = lineContent.substring(startPosition, endPosition);
            // 可能是另外一种情况 View.inflate
            if (layoutStr.contains(",")) 
                endPosition = lineContent.indexOf(",", startPosition);
                layoutStr = lineContent.substring(startPosition, endPosition);
            
            return layoutStr;
        
        return null;
    
  • 搜索整个项目获取到R.layout.xxxx.xml文件;
    @Override
    public void actionPerformed(AnActionEvent e) 
        // 获取project
        Project project = e.getProject();
        // 获取选中内容
        final Editor mEditor = e.getData(PlatformDataKeys.EDITOR);
        if (null == mEditor) 
            return;
        
        SelectionModel model = mEditor.getSelectionModel();
        mSelectedText = model.getSelectedText();
        // 未选中布局内容,显示dialog
        if (TextUtils.isEmpty(mSelectedText)) 
            // 获取光标所在位置的布局
            mSelectedText = getCurrentLayout(mEditor);
            if (TextUtils.isEmpty(mSelectedText)) 
                mSelectedText = Messages.showInputDialog(project, "布局内容:(不需要输入R.layout.)", "未选中布局内容,请输入layout文件名", Messages.getInformationIcon());
                if (TextUtils.isEmpty(mSelectedText)) 
                    Util.showPopupBalloon(mEditor, "未输入layout文件名", 5);
                    return;
                
            
        
        // 获取布局文件,通过FilenameIndex.getFilesByName获取
        // GlobalSearchScope.allScope(project)搜索整个项目
        PsiFile[] psiFiles = FilenameIndex.getFilesByName(project, mSelectedText + ".xml", GlobalSearchScope.allScope(project));
        if (psiFiles.length <= 0) 
            Util.showPopupBalloon(mEditor, "未找到选中的布局文件" + mSelectedText, 5);
            return;
        
        XmlFile xmlFile = (XmlFile) psiFiles[0];
        List<Element> elements = new ArrayList<>();
        Util.getIDsFromLayout(xmlFile, elements);
        // 将代码写入文件,不允许在主线程中进行实时的文件写入
        if (elements.size() != 0) 
            PsiFile psiFile = PsiUtilBase.getPsiFileInEditor(mEditor, project);
            PsiClass psiClass = Util.getTargetClass(mEditor, psiFile);
            // 有的话就创建变量和findViewById
            if (mDialog != null && mDialog.isShowing()) 
                mDialog.cancelDialog();
            
            mDialog = new FindViewByIdDialog(mEditor, project, psiFile, psiClass, elements, mSelectedText);
            mDialog.showDialog();
         else 
            Util.showPopupBalloon(mEditor, "未找到任何Id", 5);
        
    
  • 通过该布局文件去遍历找出含有id的布局标签,当然如果考虑完善一点需要考虑include等等;
    /**
     * 获取所有id
     *
     * @param file
     * @param elements
     * @return
     */
    public static java.util.List<Element> getIDsFromLayout(final PsiFile file, final java.util.List<Element> elements) 
        // To iterate over the elements in a file
        // 遍历一个文件的所有元素
        file.accept(new XmlRecursiveElementVisitor() 
            @Override
            public void visitElement(PsiElement element) 
            super.visitElement(element);
            // 解析Xml标签
            if (element instanceof XmlTag) 
                XmlTag tag = (XmlTag) element;
                // 获取Tag的名字(TextView)或者自定义
                String name = tag.getName();
                // 如果有include
                if (name.equalsIgnoreCase("include")) 
                    // 获取布局
                    XmlAttribute layout = tag.getAttribute("layout", null);
                    // 获取project
                    Project project = file.getProject();
                    // 布局文件
                    XmlFile include = null;
                    PsiFile[] psiFiles = FilenameIndex.getFilesByName(project, getLayoutName(layout.getValue()) + ".xml", GlobalSearchScope.allScope(project));
                    if (psiFiles.length > 0) 
                        include = (XmlFile) psiFiles[0];
                    
                    if (include != null) 
                        // 递归
                        getIDsFromLayout(include, elements);
                        return;
                    
                
                // 获取id字段属性
                XmlAttribute id = tag.getAttribute("android:id", null);
                if (id == null) 
                    return;
                
                // 获取id的值
                String idValue = id.getValue();
                if (idValue == null) 
                    return;
                
                XmlAttribute aClass = tag.getAttribute("class", null);
                if (aClass != null) 
                    name = aClass.getValue();
                
                // 添加到list
                try 
                    Element e = new Element(name, idValue,  tag);
                    elements.add(e);
                 catch (IllegalArgumentException e) 

                
            
            
        );
        return elements;
    
  • 遍历完成后生成对话框,让用户可以自己选择需要生成注解的View以及点击事件,这个是Java GUI里面的内容,我直接百度找的代码实现了效果,贴出部分源码:
    /**
     * 解析mElements,并添加到JPanel
     */
    private void initContentPanel() 
        mContentJPanel.removeAll();
        // 设置内容
        for (int i = 0; i < mElements.size(); i++) 
            Element mElement = mElements.get(i);
            IdBean itemJPanel = new IdBean(new GridLayout(1, 4, 10, 10),
                    new EmptyBorder(5, 10, 5, 10),
                    new JCheckBox(mElement.getName()),
                    new JLabel(mElement.getId()),
                    new JCheckBox(),
                    new JTextField(mElement.getFieldName()),
                    mElement);
            // 监听
            itemJPanel.setEnableActionListener(this);
            itemJPanel.setClickActionListener(clickCheckBox -> mElement.setIsCreateClickMethod(clickCheckBox.isSelected()));
            itemJPanel.setFieldFocusListener(fieldJTextField -> mElement.setFieldName(fieldJTextField.getText()));
            mContentJPanel.add(itemJPanel);
            mContentConstraints.fill = GridBagConstraints.HORIZONTAL;
            mContentConstraints.gridwidth = 0;
            mContentConstraints.gridx = 0;
            mContentConstraints.gridy = i;
            mContentConstraints.weightx = 1;
            mContentLayout.setConstraints(itemJPanel, mContentConstraints);
        
        mContentJPanel.setLayout(mContentLayout);
        jScrollPane = new JBScrollPane(mContentJPanel);
        jScrollPane.revalidate();
        // 添加到JFrame
        getContentPane().add(jScrollPane, 1);
    
  • 最后当用户点击确定生成最终的注解代码即可,主要生成注解@FindView(R.id.XXX)、@OnClick(R.id.XXX)、在OnCreate中生成SteadyoungIOC.jnject(this)等
    /**
     * 创建变量
     */
    private void generateFields() 
        for (Element element : mElements) 
            if (mClass.getText().contains("@FindView(" + element.getFullID() + ")")) 
                // 不创建新的变量
                continue;
            
            // 设置变量名,获取text里面的内容
            String text = element.getXml().getAttributeValue("android:text");
            if (TextUtils.isEmpty(text)) 
                // 如果是text为空,则获取hint里面的内容
                text = element.getXml().getAttributeValue("android:hint");
            
            // 如果是@string/app_name类似
            if (!TextUtils.isEmpty(text) && text.contains("@string/")) 
                text = text.replace("@string/", "");
                // 获取strings.xml
                PsiFile[] psiFiles = FilenameIndex.getFilesByName(mProject, "strings.xml", GlobalSearchScope.allScope(mProject));
                if (psiFiles.length > 0) 
                    for (PsiFile psiFile : psiFiles) 
                        // 获取src\\main\\res\\values下面的strings.xml文件
                        String dirName = psiFile.getParent().toString();
                        if (dirName.contains("src\\\\main\\\\res\\\\values")) 
                            text = Util.getTextFromStringsXml(psiFile, text);
                        
                    
                
            

            StringBuilder fromText = new StringBuilder();
            if (!TextUtils.isEmpty(text)) 
                fromText.append("/****" + text + "****/\\n");
            
            fromText.append("@FindView(" + element.getFullID() + ")\\n");
            fromText.append("private ");
            fromText.append(element.getName());
            fromText.append(" ");
            fromText.append(element.getFieldName());
            fromText.append(";");
            // 创建点击方法
            if (element.isCreateFiled()) 
                // 添加到class
                mClass.add(mFactory.createFieldFromText(fromText.toString(), mClass));
            
        
    

    /**
     * 创建OnClick方法
     */
    private void generateOnClickMethod() 
        for (Element element : mElements) 
            // 可以使用并且可以点击
            if (element.isCreateClickMethod()) 
                // 需要创建OnClick方法
                String methodName = getClickMethodName(element) + "Click";
                PsiMethod[] onClickMethods = mClass.findMethodsByName(methodName, true);
                boolean clickMethodExist = onClickMethods.length > 0;
                if (!clickMethodExist) 
                    // 创建点击方法
                    createClickMethod(methodName, element);
                
            
        
    

    /**
     * 创建一个点击事件
     */
    private void createClickMethod(String methodName, Element element) 
        // 拼接方法的字符串
        StringBuilder methodBuilder = new StringBuilder();
        methodBuilder.append("@OnClick(" + element.getFullID() + ")\\n");
        methodBuilder.append("private void " + methodName + "(" + element.getName() + " " + getClickMethodName(element) + ")");
        methodBuilder.append("\\n");
        // 创建OnClick方法
        mClass.add(mFactory.createMethodFromText(methodBuilder.toString(), mClass));
    

    /**
     * 获取点击方法的名称
     */
    public String getClickMethodName(Element element) 
        String[] names = element.getId().split("_");
        // aaBbCc
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < names.length; i++) 
            if (i == 0) 
                sb.append(names[i]);
             else 
                sb.append(Util.firstToUpperCase(names[i]));
            
        
        return sb.toString();
    

    /**
     * 在加载布局后根据activity Fragement View 来初始化注解框架
     */
    private void generateInjects() 
        PsiClass activityClass = JavaPsiFacade.getInstance(mProject).findClass(
                "android.app.Activity", new EverythingGlobalScope(mProject));
        PsiClass fragmentClass = JavaPsiFacade.getInstance(mProject).findClass(
                "android.app.Fragment", new EverythingGlobalScope(mProject));
        PsiClass supportFragmentClass = JavaPsiFacade.getInstance(mProject).findClass(
                "android.support.v4.app.Fragment", new EverythingGlobalScope(mProject));

        // Check for Activity class
        if (activityClass != null && mClass.isInheritor(activityClass, true)) 
            generateActivityBind();
            // Check for Fragment class
        
//        else if ((fragmentClass != null && mClass.isInheritor(fragmentClass, true)) || (supportFragmentClass != null && mClass.isInheritor(supportFragmentClass, true))) 
//            generateFragmentBindAndUnbind();
//        
    

    /**
     * activity在加载布局后生成ViewUtils.inject(this)代码
     */
    private void generateActivityBind() 
        PsiElementFactory mFactory = JavaPsiFacade.getElementFactory(mProject);
        if (mClass.findMethodsByName("onCreate", false).length == 0) 
            // Add an empty stub of onCreate()
            StringBuilder method = new StringBuilder();
            method.append("@Override protected void onCreate(android.os.Bundle savedInstanceState) \\n");
            method.append("super.onCreate(savedInstanceState);\\n");
            method.append("\\t// TODO: add setContentView(...) invocation\\n");
            method.append(VIEW_BIND);
            method.append("(this);\\n");
            method.append("");

            mClass.add(mFactory.createMethodFromText(method.toString(), mClass));
         else 
            PsiMethod onCreate = mClass.findMethodsByName("onCreate", false)[0];
            if (!containsViewInjectLine(onCreate, VIEW_BIND)) 
                for (PsiStatement statement : onCreate.getBody().getStatements()) 
                    // Search for setContentView()
                    if (statement.getFirstChild() instanceof PsiMethodCallExpression) 
                        PsiReferenceExpression methodExpression
                                = ((PsiMethodCallExpression) statement.getFirstChild())
                                .getMethodExpression();
                        // Insert ButterKnife.inject()/ButterKnife.bind() after setContentView()
                        if (methodExpression.getText().equals("setContentView")) 
                            onCreate.getBody().addAfter(mFactory.createStatementFromText(
                                    VIEW_BIND + "(this);", mClass), statement);
                            break;
                        
                    
                
            
        
    


    /**
     * 判断OnCreate中是否有初始化注解框架代码
     * @param method
     * @param line
     * @return
     */
    private boolean containsViewInjectLine(PsiMethod method, String line) 
        final PsiCodeBlock body = method.getBody();
        if (body == null) 
            return false;
        
        PsiStatement[] statements = body.getStatements();
        for (PsiStatement psiStatement : statements) 
            String statementAsString = psiStatement.getText();
            if (psiStatement instanceof PsiExpressionStatement && (statementAsString.contains(line))) 
                return true;
            
        
        return false;
    

学习Android Studio插件开发需要一些时间,如果时间够可以多了解,加班比较多那么先用着这些好用的插件,了解大概插件开发流程就够了,主要精力还是要在Android开发中。
插件源码地址:https://github.com/Steadyoung/SteadyoungIOC-CodePlug
同款框架源码地址:https://github.com/Steadyoung/SteadyoungIOC

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