Question

我正在尝试为我的应用程序创建重置应用功能，并且我尝试从内部存储中删除所有文件，包括files folder，databases folder和shared preferences。问题是，每当我尝试删除这些文件夹时，都不会删除它们。有时我用来删除文件的函数返回false。在这种情况下，我的应用程序无法正常工作。这是我正在使用的：

 @SuppressWarnings("static-access")
public void deleteAllData(){

    String cache = this.getCacheDir().toString();
    Log.e("","dbPath : "+cache);
    File ChFolder = new File(cache);
    boolean cachee = deleteDirectory(ChFolder);
    Log.e("","Database Folder Delete Success : "+cachee);

    String server = rpc.getCurrentServerName(this);
    int userId = rpc.getUserId(this);

    String userDbPath = "/data/data/"+this.getPackageName()+"/databases/"+Integer.toString(userId)+"_"+server;
    File userDbFile = new File(userDbPath);
    boolean userDbFileTF = userDbFile.delete();
    Log.e("","user Database Folder : "+userDbFileTF);

    String sysDbPath = "/data/data/"+this.getPackageName()+"/databases/stampii_sys_tpl.sqlite";
    File sysDbFile = new File(sysDbPath);
    boolean sysDbFileTF = sysDbFile.delete();
    Log.e("","user Database Folder : "+sysDbFileTF);

    // Delete Databases Folder :
    String dbPath = "/data/data/"+this.getPackageName()+"/databases/";
    Log.e("","dbPath : "+dbPath);
    File dbFolder = new File(dbPath);
    boolean dbFold = deleteDirectory(dbFolder);
    Log.e("","Database Folder Delete Success : "+dbFold);


    // Delete Files Folder :
    String name = this.getFilesDir().toString()+"/users/";
    Log.e("","path : "+name);
    File files = new File(name);
    boolean filesFol = deleteDirectory(files);
    Log.e("","filesFol : "+filesFol);

}

static public boolean deleteDirectory(File path) {
    if( path.exists() ) {
      File[] files = path.listFiles();
      if (files == null) {
          return true;
      }
      for(int i=0; i<files.length; i++) {
         if(files[i].isDirectory()) {
           deleteDirectory(files[i]);
         }
         else {
           files[i].delete();
         }
      }
    }
    return( path.delete() );
}

我是否缺少某些内容，如何在Android设置中实现Clear Data之类的功能，这也会删除数据库。

Answer 1

使用以下代码。它应该自动删除所有数据。在继续执行此操作之前，请确保没有正在使用的数据库/文件或任何缓存资源：

/**
 * Call this method to delete any cache created by app
 * @param context context for your application
 */
public static void clearApplicationData(Context context) {
    Log.i("delete", "Clearing app cache");

    File cache = context.getCacheDir();
    File appDir = new File(cache.getParent());
    if (appDir.exists()) {
        String[] children = appDir.list();
        for (String s : children) {
            File f = new File(appDir, s);
            if(deleteDir(f))
                Log.i("delete", String.format("*** DELETED -> (%s) ***",
                    f.getAbsolutePath()));
        }
    }
}

private static boolean deleteDir(File dir) {
    if (dir != null && dir.isDirectory()) {
        String[] children = dir.list();
        for (int i = 0; i < children.length; i++) {
            boolean success = deleteDir(new File(dir, children[i]));
            if (!success) {
                return false;
            }
        }
    }
    return dir.delete();
}

Answer 2

目录必须为空才能删除。以下是如何从目录中删除文件然后删除目录本身的示例。

http://www.rgagnon.com/javadetails/java-0483.html

删除数据库文件夹内部存储

2 个答案: