AppDir创建缓存目录 _创建

亦余心之所善兮，虽九死其犹未悔。这篇文章主要讲述AppDir创建缓存目录相关的知识，希望能为你提供帮助。
版权声明：本文为HaiyuKing原创文章，转载请注明出处！
前言创建缓存目录

public static String APP_CACHE = ""; ///storage/emulated/0/android/data/{package}/cache/ public static String IMAGE = ""; ///storage/emulated/0/Android/data/{package}/cache/image public static String CAMERA = ""; ///storage/emulated/0/Android/data/{package}/cache/camera public static String GIF = ""; ///storage/emulated/0/Android/data/{package}/cache/gif public static String FUND = ""; ///storage/emulated/0/Android/data/{package}/cache/fund public static String CRASH = ""; ///storage/emulated/0/Android/data/{package}/files/crash public static String PLAYER = ""; ///storage/emulated/0/Android/data/{package}/files/player public static String P2P = ""; ///storage/emulated/0/Android/data/{package}/files/p2p public static String DOWNLOAD = ""; ///storage/emulated/0/Android/data/{package}/files/download或者自定义的目录

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注意：因为创建目录都是在/storage/emulated/0/Android/data/{package}目录中，所以本来不需要权限；但是下载目录有可能需要使用SD卡中的自定义目录，所以还是需要权限的。【20191124，不需要权限】
效果图暂不需要
代码分析AppDir : 自定义需要创建的缓存目录
FileUtils ：创建目录、删除目录下所有文件、获取目录下第一个文件path
使用步骤一、项目组织结构图

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注意事项：
1、导入类文件后需要change包名以及重新import R文件路径
2、 Values目录下的文件（strings.xml、dimens.xml、colors.xml等），如果项目中存在，则复制里面的内容，不要整个覆盖
二、导入步骤
将AppDir、FileUtils复制到项目中【20191124更新】

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package com.why.project.appdirdemo.utils; import android.content.Context; import android.os.Build; import android.os.Environment; import java.io.File; /** * Created by HaiyuKing * Used 创建缓存目录 * 安卓手机的存储分为 2 部分，内部存储 ( Internal ) 和外部存储( External ): * 内部存储是指系统的存储空间，没有root是访问不到的呦亲，比如sharedPreferenced或者database都是保存在这里面的。 * 外部存储，又分为 2 部分：【操作外部存储你首先需要以下权限：WRITE_EXTERNAL_STORAGE，不过Android Q之后不再需要申请该权限】 * 机器自带的存储【ExternalStorage】，也就是手机厂商常说的16G，32G，64G之类的存储空间。 * SD卡，其实正确叫法应该是TF卡，就是可插拔的那个小东西。 * 参考资料：https://www.jianshu.com/p/116025bf51f7 */public class AppDir {public static final String TAG = AppDir.class.getName(); private static Context mContext; enum Type { CACHE,FILE; }public static String APP_CACHE = ""; ///storage/emulated/0/Android/data/{package}/cache/ public static String IMAGE = ""; ///storage/emulated/0/Android/data/{package}/cache/image public static String CAMERA = ""; ///storage/emulated/0/Android/data/{package}/cache/camera public static String GIF = ""; ///storage/emulated/0/Android/data/{package}/cache/gif public static String FUND = ""; ///storage/emulated/0/Android/data/{package}/cache/fund public static String CRASH = ""; ///storage/emulated/0/Android/data/{package}/files/crash public static String PLAYER = ""; ///storage/emulated/0/Android/data/{package}/files/player public static String P2P = ""; ///storage/emulated/0/Android/data/{package}/files/p2p public static String DOWNLOAD = ""; ///storage/emulated/0/Android/data/{package}/files/download或者自定义的目录public static AppDir getInstance(Context mContext){ AppDir appDir = new AppDir(); appDir.mContext = mContext; initDatas(); return appDir; }private static void initDatas(){ APP_CACHE = createPath("APP_CACHE", 0, "", Type.CACHE); IMAGE =createPath("IMAGE", 1, "image", Type.CACHE); CAMERA = createPath("CAMERA", 2, "camera", Type.CACHE); GIF = createPath("GIF", 3, "gif", Type.CACHE); FUND = createPath("FUND", 4, "fund", Type.CACHE); CRASH = createPath("CRASH", 5, "crash", Type.FILE); PLAYER = createPath("PLAYER", 6, "player", Type.FILE); P2P = createPath("P2P", 8, "p2p", Type.FILE); //DOWNLOAD = createDownloadPath(); //20191124，该方法不再使用 DOWNLOAD = createPath("download", 9, "download", Type.FILE); }private static String createPath(String name, int index, String subpath, Type p) { String cachePath = mContext.getExternalCacheDir() + File.separator; //一般存放临时缓存数据 String filePath = mContext.getExternalFilesDir(null) + File.separator; //一般放一些长时间保存的数据 String path = p == Type.CACHE ? cachePath + subpath : filePath + subpath; //Log.e(TAG,"{AppDir}name="+name+"; path="+path); FileUtils.makeDirs(path); //创建目录 return path; }/** * 20191124 * 这个方法不建议使用，留在这里作为备份*/ private static String createDownloadPath() { String path = ""; // 判断sd卡是否存在 boolean sdCardExit = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); //Log.e(TAG,"{AppDir}sdCardExit="+sdCardExit); if (sdCardExit) { if(Build.VERSION.SDK_INT > = 19) {//如果版本大于19，则直接在缓存目录中创建download目录 File[] files = mContext.getExternalFilesDirs("download"); if(files != null & & files.length > = 1 & & files[0] != null) { path = files[0].getAbsolutePath(); ///storage/emulated/0/Android/data/{package}/files/download } }else { path = Environment.getExternalStorageDirectory() + File.separator + "why/download"; //使用自定义的download目录 } }else{ path = Environment.getDataDirectory() + File.separator + "why/download"; //使用自定义的download目录 } //Log.e(TAG,"{AppDir}DOWNLOAD"+"; path="+path); FileUtils.makeDirs(path); //创建目录 return path; }}

AppDir

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package com.why.project.appdirdemo.utils; import android.text.TextUtils; import java.io.File; /** * Created by HaiyuKing * Used 配合APPDir的文件工具类 */public class FileUtils {//创建目录 public static boolean makeDirs(String filePath) { if (TextUtils.isEmpty(filePath)) { return false; }File folder = new File(filePath); return (folder.exists() & & folder.isDirectory()) ? true : folder.mkdirs(); }//获取目录名 public static String getFolderName(String filePath) {if (TextUtils.isEmpty(filePath)) { return filePath; }int filePosi = filePath.lastIndexOf(File.separator); return (filePosi == -1) ? "" : filePath.substring(0, filePosi); }/**删除所有文件*/ public static void deleteAllFile(String filePath) { if(!TextUtils.isEmpty(filePath)) { deleteAllFiles(new File(filePath)); } }/**删除所有文件*/ public static void deleteAllFiles(File root) { File[] arrayOfFile = root.listFiles(); if (arrayOfFile != null) { for(int j = 0; j < arrayOfFile.length; j++){ File file = arrayOfFile[j]; if (file.isDirectory()) { deleteAllFiles(file); file.delete(); }else if(file.exists()){ deleteAllFiles(file); file.delete(); } } } }/**获取第一个文件的完整路径*/ public static String firstFile(String parentPath){ File[] arrayOfFile = new File(parentPath).listFiles(); String firstFilePath = ""; if (arrayOfFile != null) { File file0 = arrayOfFile[0]; firstFilePath = file0.getPath(); } return firstFilePath; } }

FileUtils 在AndroidManifest.xml文件中声明权限【20191124，不需要权限】

< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.why.project.appdirdemo"> < !-- =================AppDir用到的权限========================== --> < !-- 允许程序读取外部存储文件 --> < !--< uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> --> < !-- 允许程序写入外部存储，如SD卡上写文件 --> < !--< uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"> < /uses-permission> --> < application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> < activity android:name=".MainActivity"> < intent-filter> < action android:name="android.intent.action.MAIN"/> < category android:name="android.intent.category.LAUNCHER"/> < /intent-filter> < /activity> < /application> < /manifest>

添加运行时权限的处理（本demo中采用的是修改targetSDKVersion=22）三、使用方法

package com.why.project.appdirdemo; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import com.why.project.appdirdemo.utils.AppDir; import com.why.project.appdirdemo.utils.FileUtils; import java.io.File; public class MainActivity extends AppCompatActivity {private static final String TAG = "MainActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String pngFilePath = AppDir.getInstance(this).IMAGE + File.separator + System.currentTimeMillis() + ".png"; Log.e(TAG,"pngFilePath="+pngFilePath); ///storage/emulated/0/Android/data/com.why.project.appdirdemo/cache/image/1507125270183.png//删除目录下所有文件 //FileUtils.deleteAllFile(AppDir.getInstance(this).IMAGE); //获取目录下第一个文件 //String pngPath = FileUtils.firstFile(AppDir.getInstance(this).IMAGE); } }

混淆配置无
参考资料暂时空缺
项目demo下载地址【AppDir创建缓存目录】暂不需要