在Android中创建文件夹 [英] Create folder in Android

问题描述

  import java.io.File; 
文件夹=新文件（Environment.getExternalStorageDirectory（）+/ TollCulator）; 
 boolean success = true; 
 if（！folder.exists（））{
 //Toast.makeText(MainActivity.this，目录不存在，创建它，Toast.LENGTH_SHORT）.show（）; 
 success = folder.mkdir（）; 
} 
 if（success）{
 //Toast.makeText(MainActivity.this，Directory Created，Toast.LENGTH_SHORT）.show（）; 
} else {
 //Toast.makeText(MainActivity.this，Failed  -  Error，Toast.LENGTH_SHORT）.show（）; 
} 
  

上述应该在SD卡中创建一个不存在的文件夹，如果那样做不做任何事情。虽然这个toast是基于条件的，但是当它不存在时它不会创建一个目录。任何想法如何解决？

我的清单如下所示：

 <？xml version =1.0encoding =utf-8？> 
< manifest xmlns：android =http://schemas.android.com/apk/res/android
 package =com.test.testing
 android：versionCode = 1
 android：versionName =1.0> 
 
< uses-permission android：name =android.permission.WRITE_EXTERNAL_STORAGE/> 
 
< uses-sdk 
 android：minSdkVersion =6
 android：targetSdkVersion =17/> 
 
< application 
 android：allowBackup =true
 android：icon =@ drawable / ic_launcher
 android：label =@ string / app_name 
 android：theme =@ style / AppTheme> 
< activity 
 android：name =com.test.testing.MainActivity
 android：label =@ string / app_name> 
< intent-filter> 
< action android：name =android.intent.action.MAIN/> 
 
< category android：name =android.intent.category.LAUNCHER/> 
< / intent-filter> 
< / activity> 
< / application> 
 
< / manifest> 
  

更新：我更新了我的清单，并更新了我的代码，仍然没有创建我的SD卡中的文件夹。请记住，我正在使用Eclipse并将应用程序直接运行到我的手机（GNex VZW），而不是使用AVD。

解决方案

在 Manifest 中添加此权限，

< uses-permission android：name =android.permission.WRITE_EXTERNAL_STORAGE/ >

 文件夹=新建文件（Environment.getExternalStorageDirectory（）+ 
文件.separator +TollCulator）; 
 boolean success = true; 
 if（！folder.exists（））{
 success = folder.mkdirs（）; 
} 
如果（成功）{
 //成功执行某项操作
} else {
 //执行其他失败
} $ b $当您运行应用程序时，您也可以使用DDMS->文件管理器 - > mnt 
文件夹 - > sdcard文件夹 - >收费创建文件夹
 
 
 
 import java.io.File;  
    File folder = new File(Environment.getExternalStorageDirectory() + "/TollCulator");
    boolean success = true;
    if (!folder.exists()) {
        //Toast.makeText(MainActivity.this, "Directory Does Not Exist, Create It", Toast.LENGTH_SHORT).show();
        success = folder.mkdir();
    }
    if (success) {
        //Toast.makeText(MainActivity.this, "Directory Created", Toast.LENGTH_SHORT).show();
    } else {
        //Toast.makeText(MainActivity.this, "Failed - Error", Toast.LENGTH_SHORT).show();
    }
The above should create a folder in my SD card if it does not exist, if it does then don't do anything. Although the toast works based on the condition but it doesn't create a directory when it does not exist. Any idea how to resolve it?

My Manifest looks like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.testing"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-sdk
        android:minSdkVersion="6"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.test.testing.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
Update: I updated my manifest as well as updated my code but it's still not creating the folder in my SD card. Keep in mind, I am using Eclipse and running the app directly to my phone (GNex VZW) instead of using an AVD.
解决方案
Add this permission in Manifest,

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
File folder = new File(Environment.getExternalStorageDirectory() + 
                             File.separator + "TollCulator");
boolean success = true;
if (!folder.exists()) {
    success = folder.mkdirs();
}
if (success) {
    // Do something on success
} else {
    // Do something else on failure 
}



  
when u run the application go too DDMS->File Explorer->mnt
  folder->sdcard folder->toll-creation folder


                        
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