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public void writeFileData(String fileName,String message){
try{
File myFile = new File(fileName);
FileOutputStream fout = new FileOutputStream(myFile);
byte [] bytes = message.getBytes();
fout.write(bytes);
fout.close();
}
catch(Exception e){
e.printStackTrace();
}
}
权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
调用 writeFileData(Environment.getExternalStorageDirectory().getAbsolutePath()+File.separator+"123.txt","xxxxxxxxxxxxxxxx");