android7.1怎么删除/data/logs下的文件夹和文件？

[yhm2046]

package com.example.a0113_log;

import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;

/**
 * 2020.1.13    需求：筛选最近五天内的文件/文件夹，超过五天的文件删除
 * 参考：https://blog.csdn.net/fujiakai/article/details/54087773
 * https://blog.csdn.net/qq_41201881/article/details/81086535
 */
public class MainActivity3 extends AppCompatActivity {
    //需要查找的文件根路径
//    private String rootPath="/sdcard/Download";
    private String rootPath="/data/logs/";
    private String TAG = "wangp";
    private static final int REQUEST_EXTERNAL_STORAGE = 1;
    private static String[] PERMISSIONS_STORAGE = {
            "android.permission.READ_EXTERNAL_STORAGE",
            "android.permission.WRITE_EXTERNAL_STORAGE" };

    /**
     * 动态权限申请,android6.0以后读取sdcard必须申请
     * @param activity
     */
    public static void verifyStoragePermissions(Activity activity) {

        try {
            //检测是否有写的权限
            int permission = ActivityCompat.checkSelfPermission(activity,
                    "android.permission.WRITE_EXTERNAL_STORAGE");
            if (permission != PackageManager.PERMISSION_GRANTED) {
                // 没有写的权限，去申请写的权限，会弹出对话框
                ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        verifyStoragePermissions(this);

//      1. 获取/data/logs/下所有文件夹名称和最后修改时间
//        testFileDirOrName(rootPath);
//        File tmpFile=new File(rootPath+"20-01-14-12-20-57/");
//        long modifileTime=tmpFile.lastModified();
//        Log.i(TAG,"modifiy time:"+modifileTime);
//        2.删除最后修改时间大于5天的文件夹
        del5Days(rootPath);
    }

    /**
     * 参考：http://www.voidcn.com/article/p-eeswpcan-bpm.html
     * 删除超过五天的文件
     * @param path
     */
    private void  del5Days(String path) {
        long fiveDayTime=5L*24L*60L*60L*1000L;  //注意不写L可能导致结果为负数
        long currentTime=System.currentTimeMillis();
        File dirFile = new File(path);
        if (dirFile.exists()) {
            File[] files = dirFile.listFiles();
            if (files != null) {
                for (File fileChildDir : files) {
                    //输出文件名或者文件夹名
//                    System.out.print(""+fileChildDir.getName());
                    if (fileChildDir.isDirectory()) {
                        long lastTime=fileChildDir.lastModified();
                        long diffenTime=currentTime-lastTime;
                        if(diffenTime>fiveDayTime)    //大于五天
                        {
                            Log.i(TAG,"del=====>"+path+fileChildDir.getName());
                            try {
                                String tmpPath=path+fileChildDir.getName()+"/";
                                delFiles(tmpPath);
                                fileChildDir.delete();
                                Log.i(TAG,"delete success!");
                            } catch (Exception e) {
                                e.printStackTrace();
                                Log.i(TAG,"delete error"+e.toString());
                            }
                        }
                    }
                    if (fileChildDir.isFile()) {
//                        System.out.println(fileChildDir.getName()+" :  此为文件名");
                    }
                }
            }
        }else{
            System.out.println("你想查找的文件不存在");
            return ;
        }
    }

    /**
     * 递归删除指定路径的文件
     * @return
     */
    public void delFiles(String filePath){
        File file = new File(filePath);
        if(!file.exists()){
            return;
        }
        String[] list = file.list();
        File temp = null;
        String path = null;
        for (String item:list) {
            path = filePath + File.separator + item;
            temp = new File(path);
            if(temp.isFile()){
                temp.delete();
                continue;
            }
            if(temp.isDirectory()) {
                delFiles(path);
                new File(path).delete();
                continue;
            }
        }
    }

    /**
     *
     * @param srcTime   long类型的原始数据
     * @param format    yyyy-MM-dd HH:mm:ss
     * @return  String时间格式输出，失败则输出long转成得string
     */
    public String LongTime2DateFormat(long srcTime,String format){
        try {
            Date d=new Date(srcTime);
            String time=new SimpleDateFormat(format).format(d);
            return time;
        } catch (Exception e) {
            e.printStackTrace();
            Log.i("wan","LongTime2DateFormat error:"+e.toString());
            return srcTime+"";
        }
    }

    /**
     *
     * 获取目录下所有文件
     *
     * @param realpath
     * @param files
     * @return
     */
    public static List<File> getFiles(String realpath, List<File> files) {
        File realFile = new File(realpath);
        if (realFile.isDirectory()) {
            File[] subfiles = realFile.listFiles();
            for (File file : subfiles) {
                if (file.isDirectory()) {
                    getFiles(file.getAbsolutePath(), files);
                } else {
                    files.add(file);
                }
            }
        }
        return files;
    }

    /**
     * 获取目录下所有文件(按时间降序)
     *
     * @param path
     * @return
     */
    public static List<File> getFileSort(String path) {
        List<File> list = getFiles(path, new ArrayList<File>());
        if (list != null && list.size() > 0) {
            Collections.sort(list, new Comparator<File>() {
                public int compare(File file, File newFile) {
                    if (file.lastModified() < newFile.lastModified()) {
                        return 1;
                    } else if (file.lastModified() == newFile.lastModified()) {
                        return 0;
                    } else {
                        return -1;
                    }
                }
            });
        }
        return list;
    }


}

[yhm2046]

这里打印删除了，但是adb命令看了文件夹还在是什么原因？

try {
                                String tmpPath=path+fileChildDir.getName()+"/";
                                delFiles(tmpPath);
                                fileChildDir.delete();
                                Log.i(TAG,"delete success!");
                            } catch (Exception e) {
                                e.printStackTrace();
                                Log.i(TAG,"delete error"+e.toString());
                            }