![](/img/trans.png)
[英]FileDescriptor:error android.system.ErrnoException: open failed: ENOENT (No such file or directory)
[英]i want to download a image from network but give this Exception :android.system.ErrnoException: open failed: ENOENT (No such file or directory)
我把权限放在清单中。 我想从互联网下载图像并将其存储在外部存储中。 图片链接没问题。 写入外部存储器时出现问题。
public class MainActivity extends AppCompatActivity {
final static String DL_URL = "https://download.hipwallpaper.com/desktop/1920/1080/1/97/yE0qUN.jpg";
public static Context context;
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
imageView = findViewById(R.id.image_view);
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},111);
}
public void onClick(View view) {
MyTask task = new MyTask();
task.execute(DL_URL);
}
class MyTask extends AsyncTask<String,String,String>{
@Override
protected String doInBackground(String... params) {
try {
URL url = new URL(params[0]);
URLConnection connection = url.openConnection();
connection.connect();
int lenghtfile = connection.getContentLength();
BufferedInputStream input = new BufferedInputStream(url.openStream()); //
File dir= new File(Environment.getExternalStorageDirectory().getParent());
File myDir = new File(dir,"Downloads");
File outFile = new File(myDir,"yE0qUN.jpg");
outFile.mkdirs();
byte[] myfile = new byte[lenghtfile];
input.read(myfile);
OutputStream output = new FileOutputStream(outFile);
output.write(myfile);
output.flush();
output.close();
return null;
}
}
问题是我总是在创建目录。 事实上,我并没有在目录中创建文件。 现在我创建了一个目录并为我的新文件设置了路径。 我修改了上面的代码如下,问题解决了:
File dir = new File((Environment.getExternalStorageDirectory() + "/"+"Downloads"));
dir.mkdirs();
File outFile = new File(dir,"wallpaper.png");
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