我希望我的应用程序的用户能够删除DCIM文件夹(它位于SD卡上并包含子文件夹)。
这可能吗?如果可能,怎么可能?
我希望我的应用程序的用户能够删除DCIM文件夹(它位于SD卡上并包含子文件夹)。
这可能吗?如果可能,怎么可能?
当前回答
我们可以使用命令行参数删除整个文件夹及其内容。
public static void deleteFiles(String path) {
File file = new File(path);
if (file.exists()) {
String deleteCmd = "rm -r " + path;
Runtime runtime = Runtime.getRuntime();
try {
runtime.exec(deleteCmd);
} catch (IOException e) { }
}
}
以上代码的使用示例:
deleteFiles("/sdcard/uploads/");
其他回答
看到android.os。FileUtils,它隐藏在API 21上
public static boolean deleteContents(File dir) {
File[] files = dir.listFiles();
boolean success = true;
if (files != null) {
for (File file : files) {
if (file.isDirectory()) {
success &= deleteContents(file);
}
if (!file.delete()) {
Log.w("Failed to delete " + file);
success = false;
}
}
}
return success;
}
来源:https://android.googlesource.com/platform/frameworks/base/ + /主/核心/ java / android / os / FileUtils.java # 414
最快最简单的方法:
public static boolean deleteFolder(File removableFolder) {
File[] files = removableFolder.listFiles();
if (files != null && files.length > 0) {
for (File file : files) {
boolean success;
if (file.isDirectory())
success = deleteFolder(file);
else success = file.delete();
if (!success) return false;
}
}
return removableFolder.delete();
}
这(尝试删除所有子文件和子目录,包括提供的目录):
如果是文件,删除 如果是空目录,请删除 如果不是空目录,再次调用删除子目录,重复1到3
例子:
File externalDir = Environment.getExternalStorageDirectory()
Utils.deleteAll(externalDir); //BE CAREFUL.. Will try and delete ALL external storage files and directories
访问“外部存储目录”需要具备以下权限:
(使用ContextCompat。checkSelfPermission和ActivityCompat.requestPermissions)
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
递归方法:
public static boolean deleteAll(File file) {
if (file == null || !file.exists()) return false;
boolean success = true;
if (file.isDirectory()) {
File[] files = file.listFiles();
if (files != null && files.length > 0) {
for (File f : files) {
if (f.isDirectory()) {
success &= deleteAll(f);
}
if (!f.delete()) {
Log.w("deleteAll", "Failed to delete " + f);
success = false;
}
}
} else {
if (!file.delete()) {
Log.w("deleteAll", "Failed to delete " + file);
success = false;
}
}
} else {
if (!file.delete()) {
Log.w("deleteAll", "Failed to delete " + file);
success = false;
}
}
return success;
}
根据文档:
如果此抽象路径名不表示目录,则此方法返回null。
所以你应该检查listFiles是否为空,如果不是则继续
boolean deleteDirectory(File path) {
if(path.exists()) {
File[] files = path.listFiles();
if (files == null) {
return false;
}
for (File file : files) {
if (file.isDirectory()) {
deleteDirectory(file);
} else {
boolean wasSuccessful = file.delete();
if (wasSuccessful) {
Log.i("Deleted ", "successfully");
}
}
}
}
return(path.delete());
}
在Kotlin中,您可以使用Kotlin中的deleterecursive()扩展。io包
val someDir = File("/path/to/dir")
someDir.deleteRecursively()