一、首先添加权限
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1
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<uses-permission android:name=
"android.permission.WRITE_EXTERNAL_STORAGE"
></uses-permission>
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二、建立文件夹、生成文件并写入文本文件内容代码
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private
void
initData() {
String filePath =
"/sdcard/Test/"
;
String fileName =
"log.txt"
;
writeTxtToFile(
"txt content"
, filePath, fileName);
}
// 将字符串写入到文本文件中
public
void
writeTxtToFile(String strcontent, String filePath, String fileName) {
//生成文件夹之后，再生成文件，不然会出错
makeFilePath(filePath, fileName);
String strFilePath = filePath+fileName;
// 每次写入时，都换行写
String strContent = strcontent +
"\r\n"
;
try
{
File file =
new
File(strFilePath);
if
(!file.exists()) {
Log.d(
"TestFile"
,
"Create the file:"
+ strFilePath);
file.getParentFile().mkdirs();
file.createNewFile();
}
RandomAccessFile raf =
new
RandomAccessFile(file,
"rwd"
);
raf.seek(file.length());
raf.write(strContent.getBytes());
raf.close();
}
catch
(Exception e) {
Log.e(
"TestFile"
,
"Error on write File:"
+ e);
}
}
// 生成文件
public
File makeFilePath(String filePath, String fileName) {
File file =
null
;
makeRootDirectory(filePath);
try
{
file =
new
File(filePath + fileName);
if
(!file.exists()) {
file.createNewFile();
}
}
catch
(Exception e) {
e.printStackTrace();
}
return
file;
}
// 生成文件夹
public
static
void
makeRootDirectory(String filePath) {
File file =
null
;
try
{
file =
new
File(filePath);
if
(!file.exists()) {
file.mkdir();
}
}
catch
(Exception e) {
Log.i(
"error:"
, e+
""
);
}
}
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