AppDir【创建缓存目录】【建议使用这个工具类】
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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
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
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】
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; } }
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; } }
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
暂不需要