<span style=
"font-size:18px;"
>
1
.权限添加
<uses-permission android:name=
"android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
>
<uses-permission android:name=
"android.permission.WRITE_EXTERNAL_STORAGE"
>
public
static
String getDataFolderPath(Context paramContext) {
return
Environment.getDataDirectory() +
"/data/"
+ paramContext.getPackageName() +
"/files"
;
}
public
static
String getMyFileDir(Context context){
return
context.getFilesDir().toString();
}
public
static
String getMyCacheDir(Context context){
return
context.getCacheDir().toString();
}
/**
* @desc 保存内容到文件中
* @param fileName
* @param content
* @throws Exception
*/
public
static
void
save(Context context, String fileName, String content,
int
module) {
try
{
FileOutputStream os = context.openFileOutput(fileName, module);
os.write(content.getBytes());
os.close();
}
catch
(Exception e) {
e.printStackTrace();
}
}
/**
* @desc 读取文件内容
* @param fileName
* @return
*/
public
static
String read(Context context, String fileName){
try
{
FileInputStream fis = context.openFileInput(fileName);
ByteArrayOutputStream bos =
new
ByteArrayOutputStream();
byte
[] b =
new
byte
[
1024
];
int
len =
0
;
while
((len = fis.read(b)) != -
1
){
bos.write(b,
0
, len);
}
byte
[] data = bos.toByteArray();
fis.close();
bos.close();
return
new
String(data);
}
catch
(Exception e) {
e.printStackTrace();
}
return
null
;
}
/**
* @desc 将文本内容保存到sd卡的文件中
* @param context
* @param fileName
* @param content
* @throws IOException
*/
public
static
void
saveToSDCard(Context context, String fileName, String content)
throws
IOException{
File file =
new
File(Environment.getExternalStorageDirectory(),fileName);
FileOutputStream fos =
new
FileOutputStream(file);
fos.write(content.getBytes());
fos.close();
}
/**
* @desc 读取sd卡文件内容
* @param fileName
* @return
* @throws IOException
*/
public
static
String readSDCard(String fileName)
throws
IOException {
File file =
new
File(Environment.getExternalStorageDirectory(),fileName);
FileInputStream fis =
new
FileInputStream(file);
ByteArrayOutputStream bos =
new
ByteArrayOutputStream();
byte
[] buffer =
new
byte
[
1024
];
int
len =
0
;
while
((len = fis.read(buffer)) != -
1
)
{
bos.write(buffer,
0
, len);
}
byte
[] data = bos.toByteArray();
fis.close();
bos.close();
return
new
String(data);
}</uses-permission></uses-permission></span>
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Android files saved to the app and SD card