Android文件不創建

Question

我想創建一個包含字符串的文本文件。

String string = "hello!"; 

File file = new File(Environment.getExternalStorageDirectory(),"test.txt"); 

FileOutputStream fos = new FileOutputStream(file); 
fos.write(string.getBytes()); 
fos.close(); 

我有適當的權限。

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.latorre" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="8" 
     android:targetSdkVersion="10" /> 

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

但是文件沒有被創建。爲什麼？

Answer 1

public void writefile(String word1) 
     try { 
        String path = sdCard.getAbsolutePath() + "/"; 

     File logFile = new File(path + "test.txt"); 
     if (!logFile.exists()) { 
      logFile.createNewFile(); 
     } 

     // BufferedWriter for performance, true to set append to file 

     FileWriter fw = new FileWriter(logFile, true); 
     BufferedWriter buf = new BufferedWriter(fw); 


      buf.append(word1); 
      buf.newLine(); 
      buf.flush(); 

     } 
     buf.close(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

Answer 2

String string = "hello!"; 

File file = new File(Environment.getExternalStorageDirectory() + "/", "test.txt"); 
if (!file.exists()){ 
    file.createNewFile(); 
} 

FileOutputStream fos = new FileOutputStream(file, true); 
fos.write(string.getBytes()); 
fos.close();