在android中将文件写入sdcard
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Write file to sdcard in android
提问by Looking Forward
I want to create a file on sdcard. Here I can create file and read/write it to the application, but what I want here is, the file should be saved on specific folder of sdcard. How can I do that using FileOutputStream?
我想在 sdcard 上创建一个文件。在这里，我可以创建文件并将其读/写到应用程序中，但我想要的是，该文件应保存在 sdcard 的特定文件夹中。我怎样才能做到这一点FileOutputStream？
// create file
public void createfile(String name)
{
try
{
new FileOutputStream(filename, true).close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// write to file
public void appendToFile(String dataAppend, String nameOfFile) throws IOException
{
fosAppend = openFileOutput(nameOfFile, Context.MODE_APPEND);
fosAppend.write(dataAppend.getBytes());
fosAppend.write(System.getProperty("line.separator").getBytes());
fosAppend.flush();
fosAppend.close();
}
回答by Rakeeb Rajbhandari
Here's an example from my code:
这是我的代码中的一个示例：
try {
String filename = "abc.txt";
File myFile = new File(Environment
.getExternalStorageDirectory(), filename);
if (!myFile.exists())
myFile.createNewFile();
FileOutputStream fos;
byte[] data = string.getBytes();
try {
fos = new FileOutputStream(myFile);
fos.write(data);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
And don't forget the:
并且不要忘记：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
回答by Gunaseelan
Try like this,
试试这样，
try {
File newFolder = new File(Environment.getExternalStorageDirectory(), "TestFolder");
if (!newFolder.exists()) {
newFolder.mkdir();
}
try {
File file = new File(newFolder, "MyTest" + ".txt");
file.createNewFile();
} catch (Exception ex) {
System.out.println("ex: " + ex);
}
} catch (Exception e) {
System.out.println("e: " + e);
}
回答by Rajith Rajan
It's pretty easy to create folder and write file on sd card in android
在android中创建文件夹并在sd卡上写入文件非常容易
Code snippet
代码片段
String ext_storage_state = Environment.getExternalStorageState();
File mediaStorage = new File(Environment.getExternalStorageDirectory()
+ "/Folder name");
if (ext_storage_state.equalsIgnoreCase(Environment.MEDIA_MOUNTED)) {
if (!mediaStorage.exists()) {
mediaStorage.mkdirs();
}
//write file writing code..
try {
FileOutputStream fos=new FileOutputStream(file name);
try {
fos.write(filename.toByteArray());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
//Toast message sd card not found..
}
回答by Kat
Note: 'getExternalStorageDirectory()' actually gives you a path to /storage/emulated/0 and not the actual sdcard
注意：“getExternalStorageDirectory()”实际上为您提供了 /storage/emulated/0 的路径，而不是实际的 sdcard
'String path = Syst.envr("SECONDARY_STORAGE");' gives you a path to the sd card
'String path = Syst.envr("SECONDARY_STORAGE");' 为您提供通往 SD 卡的路径
