即使在寻求存储权限后也不会创建目录

Question

public class MainActivity extends AppCompatActivity {


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    if(haveStoragePermission()) {

        File new_folder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "Images");
        if (!new_folder.exists()) {
            new_folder.mkdirs();
            boolean k=   new_folder.mkdirs();
         if (k)
         {
          Toast.makeText(this,"Directory created successfully",Toast.LENGTH_LONG).show();
         }
         else Toast.makeText(this,"Failed to create directory",Toast.LENGTH_LONG).show();

        }
        
    }


}

Answer 1

问题不是关于文件下载。问题是您没有访问存储的权限。请检查错误。

Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)

所以似乎无法创建文件。您可能需要检查是否具有写入存储的权限。如果您不想请求该权限，可以在内部存储中创建文件。

你应该这样叫它

if(haveStoragePermission()) {
    DownloadTask downloadTask = new DownloadTask();
    downloadTask.execute("https://www.popwebdesign.net/popart_blog/wp-content/uploads/2018/01/tiny-png-panda.jpg");
}