[英]Android failed to mkdir() on SD card
我有一些代碼可以在SD卡上創建/獲取文件夾:
if( hasSDCard() ){
UUID uniqueFileName = UUID.randomUUID();
mediaStorageDir = new File(
getExternalImageStoragePath(),
"MyApp");
if ( ! mediaStorageDir.exists() ){
if( ! mediaStorageDir.mkdirs() ){
MyLogger.Error("Create image directory FAILED. path: " + mediaStorageDir.getPath());
return null;
}
}
並且我已經在清單文件中注冊了權限:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STOREAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
但是當我運行它時,它會打印:
Create image directory FAILED. path: /storage/emulated/0/Pictures/MyApp
我想知道為什么會這樣嗎?
===更新===
我已經嘗試了所有這些:
/**
* get external storage directory path for image
* @return
*/
public static String getExternalImageStoragePath(){
String strPath = "";
if(hasSDCard()){
//strPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath();
//strPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath();
//strPath = Environment.getExternalStorageDirectory().getPath();
strPath = Environment.getExternalStorageDirectory().getAbsolutePath();
}
return strPath;
}
但是他們的行為完全一樣...
===更新2 ===
我正在測試Nexus5。我看到了這篇文章在Eclipse中找不到Nexus 7的storage / emulated / 0 /文件夾可能有問題嗎?
===更新3 ===
>> adb shell ls -l /storage/
dr-xr-xr-x root root 1970-01-24 23:48 emulated
lrwxrwxrwx root root 1970-01-24 23:48 sdcard0 -> /storage/emulated/legacy
>> adb shell ls -l /storage/emulated/0/Pictures/
/storage/emulated/0/Pictures/: No such file or directory
===更新4 ===
這是我的hasSD()
方法:
public static boolean hasSDCard(){
boolean fHasSDCard = false;
if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())){
fHasSDCard = true;
}
return fHasSDCard;
}
編輯:您拼錯了您的權限(您有STOREAGE,而正確的是STORAGE)
更改
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STOREAGE"/>
至:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
除非您尚未在hasSDCard()中進行此操作,否則請檢查您的外部媒體是否完全可用。 正如文檔所說:
在使用外部存儲進行任何操作之前,應始終調用getExternalStorageState()來檢查介質是否可用。 介質可能已安裝到計算機上,丟失,只讀或處於其他某種狀態。
他們提供了一個示例:
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// Something else is wrong. It may be one of many other states, but all we need
// to know is we can neither read nor write
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
// try this
File mediaStorageDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "MyApp" + "/");
if (!mediaStorageDir.exists()) {
mediaStorageDir.mkdirs();
}
mediaStorageDir.getAbsolutePath()
嘗試這個:
mediaStorageDir = new File(
Environment.getExternalStorageDirectory().getAbsolutePath(),
"MyApp");
這就是我正在做的事情,對我有用
File path = Environment.getExternalStorageDirectory();
String save_path = path.toString() + "/MyApp/";
File newFile=new File(save_path );
newFile.mkdirs();
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