android lint 去除无用的资源

        开发android应用的时候，界面有时会经常更改，导致很多无用的资源文件。如果不清理掉，可能会导致apk变大，性能降低。手动清理又很难判断哪些资源有用，哪些资源无用。所以，下面就开发了一个利用lint自动删除无用资源文件的工具。

一、基本原理

       原理非常简单，首先，运行lint命令，生成分析文件。命令如下：

      lint  --check "UnusedResources"  <projectPath>  > result.txt

    

      生成文件之后，就解析改文件，得到无用的资源，然后删除它们。

二、源码

import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.IOException;import javax.swing.JFileChooser;import javax.swing.JLabel;public class RemoveUnuseFile {private static final String RESULT_FILE_NAME = "result";private String mProjectPath;private String mCmd;public static void main(String[] args) throws Exception {RemoveUnuseFile ruf = new RemoveUnuseFile();ruf.execute();}public void execute() throws Exception {mProjectPath = getProjectPath();mCmd = getCmdPath();mCmd += " --check \"UnusedResources\" " + mProjectPath + " > "+ RESULT_FILE_NAME;int optimizedCount = 0;int count = 0;while (optimizedCount < 3) {String result = getLintFile();boolean isOptimezed1 = deleteUnuseFile(result);boolean isOptimized2 = deleteUnuseRes(result);if (isOptimezed1 || isOptimized2) {optimizedCount = 0;} else {optimizedCount++;}System.out.println(++count+ "==================================================");}}private String getProjectPath() {JFileChooser chooser = new JFileChooser();chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);chooser.showDialog(new JLabel(), "选择工程");File file = chooser.getSelectedFile();System.out.print("" + file.getPath());return file.getAbsolutePath();}private String getCmdPath() {JFileChooser chooser = new JFileChooser();chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);chooser.showDialog(new JLabel(), "选择lint命令");File file = chooser.getSelectedFile();System.out.print("" + file.getPath());return file.getAbsolutePath();}private String getLintFile() throws IOException, InterruptedException {File f = new File(RESULT_FILE_NAME);if (!f.exists()) {f.mkdir();}String fileName = System.currentTimeMillis() + ".txt";Process p = Runtime.getRuntime().exec(mCmd + "//" + fileName);p.waitFor();/* * while(!(new File(getResultFilePath(fileName))).exists()){ try { * TimeUnit.MILLISECONDS.sleep(200); } catch (InterruptedException e) { * // TODO Auto-generated catch block e.printStackTrace(); } } */System.out.println("got result file:"+ (new File(getResultFilePath(fileName))).exists());return fileName;}private String getResultFilePath(String result) {return RESULT_FILE_NAME + "\\" + result;}private boolean deleteUnuseRes(String result) throws IOException {System.out.println("deleteUnuseRes:" + result);BufferedReader reader = new BufferedReader(new FileReader(getResultFilePath(result)));File f2 = new File(getResultFilePath(result));System.out.println("" + f2.length());String line;boolean isOptimized = false;while ((line = reader.readLine()) != null) {if (line.contains("UnusedResources")&& line.startsWith("res\\values")) {int end = line.indexOf(":");if (end != -1) {String file = line.substring(0, end);String f = mProjectPath + file;line = line.substring(end + 1);end = line.indexOf(":");int l = Integer.valueOf(line.substring(0, end));FileVaulesProcess.getFileValueProcess(f).deleteLine(l);isOptimized = true;}}}System.out.println("last line:" + line);reader.close();FileVaulesProcess.finish();return isOptimized;}public boolean deleteUnuseFile(String result) throws IOException {System.out.println("deleteUnuseFile:" + result);BufferedReader reader = new BufferedReader(new FileReader(getResultFilePath(result)));String line;boolean isOptimized = false;while ((line = reader.readLine()) != null) {if (line.contains("UnusedResources")&& !line.contains("res\\values")&& !line.contains("appcompat")) {int end = line.indexOf(":");if (end != -1) {String file = line.substring(0, end);String f = mProjectPath + file;System.out.println(f);new File(f).delete();System.out.println("delete file:" + file);isOptimized = true;}}}reader.close();return isOptimized;}}

import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileReader;import java.io.IOException;import java.io.OutputStreamWriter;import java.util.HashMap;import java.util.Set;public class FileVaulesProcess {    private String mFileName;    private BufferedReader mBufferReader;private FileOutputStream mOutputSteam;private OutputStreamWriter mOutputStreamWriter;private int mLine = 1;private File mOutFile;private static HashMap<String,FileVaulesProcess> mHashMap = new HashMap<String,FileVaulesProcess>();public static FileVaulesProcess getFileValueProcess(String fileName){if(!mHashMap.containsKey(fileName)){FileVaulesProcess fp = new FileVaulesProcess(fileName);mHashMap.put(fileName, fp);return fp;}else{return mHashMap.get(fileName);}}    private FileVaulesProcess(String file) {    System.out.println("file:" + file);    mFileName = file;     try {init();} catch (FileNotFoundException e) {e.printStackTrace();}}        private void init() throws FileNotFoundException{    mBufferReader = new BufferedReader(new FileReader(mFileName));    mOutFile = new File(mFileName + ".bck");mOutputSteam = new FileOutputStream(mOutFile);mOutputStreamWriter = new OutputStreamWriter(mOutputSteam);        }        public void deleteLine(int line) throws IOException{    while(mLine < line){    String str = mBufferReader.readLine();    mOutputStreamWriter.write(str+"\n");    mLine++;    }    String str = mBufferReader.readLine();    mLine++;    System.out.println("delete line:" + line +":" + str);    }        public void finishDelete() throws IOException{    String str= null;    while((str = mBufferReader.readLine())!= null){    mOutputStreamWriter.write(str + "\n");    }    mOutputStreamWriter.close();    mOutputSteam.close();    mBufferReader.close();    File oldFile = new File(mFileName);    oldFile.delete();     oldFile = new File(mFileName);    mOutFile.renameTo(oldFile);        }public static void finish() throws IOException {Set<String> keySet = mHashMap.keySet();for(String key:keySet){mHashMap.get(key).finishDelete();}mHashMap.clear();}    }