Android文件不要创建

Question

我想创建一个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();

我拥有相应的权限。

<?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" />...

但是没有创建该文件。为什么呢？

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();