我想在"Ocenki"
文件夹中创建一个txt文件
我写了应该写入stringbuffer文件的代码:
try {
FileOutputStream write = new FileOutputStream(
new File(
context.getFilesDir()
+ File.separator + "Ocenki"
+ File.separator + url + ".txt")
);
String temp_write = stringBuffer.toString();
write.write(temp_write.getBytes());
write.close();
} catch (FileNotFoundException p) {
p.printStackTrace();
} catch (IOException a) {
a.printStackTrace();
}
方法context.getFilesDir()
返回:"/data/user/0/com.example.kos/files"
变量url
包含:"2019 - 2020"
代码中发生错误:
FileNotFoundException
"java.io.FileNotFoundException: /data/user/0/com.example.kos/files/2019 - 2020.txt
(No such file or directory)"
我该怎么办?
UPD:
清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.kos"
android:versionCode="2"
android:versionName="1.1.1">
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
...
</manifest>
这里是权限请求:
if(ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions((Activity) context,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},3);
if(ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions((Activity) context,new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},3);
问题可能出在路径上。路径/data/user/0/com.example.kos/files/
中的一个或多个目录丢失。查看您的代码,在Ocenki
目录内应该有一个files
目录,但是在堆栈跟踪中缺少该目录。从/data/user/0/com.example.kos/files/Ocenki
你在这里,
try{
System.out.println("File Path = " + MainApplication.getFileDirectory() + "/Ocenki" + "/" + fileName);
File fileCreated = new File(MainApplication.getFileDirectory() + "/Ocenki" + "/" + fileName);
if (fileCreated.exists()) {
fileCreated.delete();
}
outputStream = new FileOutputStream(MainApplication.getFileDirectory() + "/Ocenki" + "/" + fileName);
byte[] buffer = new byte[1024];
int read;
while ((read = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, read);
}
//inputStream.close();
outputStream.flush();
outputStream.close();
}catch (IOException io){
io.printStackTrace();
}
public static File getFileDirectory() {
return filesDir;
}
正如我在应用程序类中使用此类时,您可以根据上下文在任何类上使用此方法
filesDir = MainApplication.this.getFilesDir();