[英]android marshmallow writing public file on sdcard
我想將一些文件保存在SDCard Documents文件夾的子文件夾中。 我看過很多帖子,最后我沒有任何異常,似乎文件存儲很好,但是當我將手機連接到comp時,我仍然看不到文件夾或文件。
編輯
這僅在設備上,在模擬器上創建文件時發生
我已在清單文件中授予權限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
我已經要求用戶提供寫許可,並且它被授予。 這篇文章這篇文章幫助我授予了權限
這是我的代碼
if (!Environment.getExternalStorageState().equalsIgnoreCase(Environment.MEDIA_MOUNTED)) {
Toast.makeText(_ctx, "There is no external storage", Toast.LENGTH_LONG).show();
} else {
File docfolder = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
docfolder.mkdirs();
if (!docfolder.exists()) {
Toast.makeText(_ctx, "Documents doesn't exist", Toast.LENGTH_LONG).show();
}
File folder = new File(docfolder, foldername);
folder.mkdirs(); //make if not exist
boolean isPresent = folder.exists();
if (isPresent) {
File file = new File(folder.getAbsolutePath(), filename);
try {
OutputStream os = new FileOutputStream(file);
os.write(xml.getBytes());
os.close();
} catch (IOException e) {
Toast.makeText(_ctx, e.toString(), Toast.LENGTH_LONG).show();
Log.w("ExternalStorage", "Error writing " + file, e);
}
catch (Exception e) {
Toast.makeText(_ctx, e.toString(), Toast.LENGTH_LONG).show();
Log.w("ExternalStorage", "Error writing 2 " + file, e);
}
} else {
Toast.makeText(_ctx, "cannot make directory " + foldername, Toast.LENGTH_LONG).show();
Log.w("ExternalStorage", "cannot make directory " + foldername);
}
任何提示都歡迎!
編輯
也許問題在於此代碼會將文件保存到該路徑中?
/storage/emulated/0/Documents/IBHTrack/ibhTrack_GPX_20170706153858.xml
但是,由於我使用Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS)
方法,所以我不知道如何獲取真實的SDCard路徑
首先檢查權限:
void checkPermission(Activity thisActivity){
// Here, thisActivity is the current activity
if (ContextCompat.checkSelfPermission(thisActivity,
Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
Toast.makeText(MainActivity.this,"Permission denied, now log will not write in storage.",Toast.LENGTH_SHORT).show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(thisActivity,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
101);
}
}else {
processFileLog(messageForLog);
}
}
然后處理許可的響應:
@Override
public void onRequestPermissionsResult(int requestCode,String permissions[], int[] grantResults) {
switch (requestCode) {
case 101: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
processFileLog(messageForLog);
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(MainActivity.this,"Permission denied, now log will not write in storage.",Toast.LENGTH_SHORT).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
使用這種方法,您可以將數據記錄到文件中:
/**
* Tag value
*/
private static final String mTag = "Logs";
/**
* File
*/
private static File mLogFolder = null;
private static void writeLog() {
if (isExternalStorageWritable()) {
mLogFolder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() +
"/app-client-logs");
if (!mLogFolder.exists()) {
if (!mLogFolder.mkdirs()) {
System.out.println("Unable to create the log folder");
}
}
} else {
System.out.println("SD Card not available for read and write");
}
}
public static void processFileLog(final String message) {
writeLog();
File file = new File(mLogFolder, mTag + ".log");
try {
BufferedWriter buf = new BufferedWriter(new FileWriter(file, true));
String currentDateTimeString = DateFormat.getDateTimeInstance().format(System.currentTimeMillis());
buf.append("\nSafety Net Request "+currentDateTimeString).append(":\n").append(message);
buf.newLine();
buf.close();
} catch (IOException e) {
e.printStackTrace();
}
}
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