Android 6.0のAlertDialogのディレクトリに外部ファイルが見えませんか？

Question

私はアンドロイド5.1で私のアプリケーションを走らせても、AlertDialogのルートファイルを見ても問題はありませんが、6.0で動いても何も表示されません。ここでは、イメージの違いを示します。

In android 5.1

In android 6.0

SimpleFileDialog.java

public class SimpleFileDialog 
{ 
private int FileOpen  = 0; 
private int FileSave  = 1; 
private int FolderChoose = 2; 
private int Select_type = FileSave; 
private String m_sdcardDirectory = ""; 
private Context m_context; 
private TextView m_titleView1; 
private TextView m_titleView; 
public String Default_File_Name = "default.txt"; 
private String Selected_File_Name = Default_File_Name; 
private EditText input_text; 

private String m_dir = ""; 
private List<String> m_subdirs = null; 
private SimpleFileDialogListener m_SimpleFileDialogListener = null; 
private ArrayAdapter<String> m_listAdapter = null; 

////////////////////////////////////////////////////// 
// Callback interface for selected directory 
////////////////////////////////////////////////////// 
public interface SimpleFileDialogListener 
{ 
    public void onChosenDir(String chosenDir); 
} 

public SimpleFileDialog(Context context, String file_select_type, SimpleFileDialogListener SimpleFileDialogListener) 
{ 
    if (file_select_type.equals("FileOpen"))   Select_type = FileOpen; 
    else if (file_select_type.equals("FileSave"))  Select_type = FileSave; 
    else if (file_select_type.equals("FolderChoose")) Select_type = FolderChoose; 
    else Select_type = FileOpen; 

    m_context = context; 
    m_sdcardDirectory = Environment.getExternalStorageDirectory().getAbsolutePath(); 
    m_SimpleFileDialogListener = SimpleFileDialogListener; 

    try 
    { 
     m_sdcardDirectory = new File(m_sdcardDirectory).getCanonicalPath(); 
    } 
    catch (IOException ioe) 
    { 
    } 
} 

/////////////////////////////////////////////////////////////////////// 
// chooseFile_or_Dir() - load directory chooser dialog for initial 
// default sdcard directory 
/////////////////////////////////////////////////////////////////////// 
public void chooseFile_or_Dir() 
{ 
    // Initial directory is sdcard directory 
    if (m_dir.equals("")) chooseFile_or_Dir(m_sdcardDirectory); 
    else chooseFile_or_Dir(m_dir); 
} 

//////////////////////////////////////////////////////////////////////////////// 
// chooseFile_or_Dir(String dir) - load directory chooser dialog for initial 
// input 'dir' directory 
//////////////////////////////////////////////////////////////////////////////// 
public void chooseFile_or_Dir(String dir) 
{ 
    File dirFile = new File(dir); 
    if (! dirFile.exists() || ! dirFile.isDirectory()) 
    { 
     dir = m_sdcardDirectory; 
    } 

    try 
    { 
     dir = new File(dir).getCanonicalPath(); 
    } 
    catch (IOException ioe) 
    { 
     return; 
    } 

    m_dir = dir; 
    m_subdirs = getDirectories(dir); 

    class SimpleFileDialogOnClickListener implements DialogInterface.OnClickListener 
    { 
     public void onClick(DialogInterface dialog, int item) 
     { 
      String m_dir_old = m_dir; 
      String sel = "" + ((AlertDialog) dialog).getListView().getAdapter().getItem(item); 
      if (sel.charAt(sel.length()-1) == '/') sel = sel.substring(0, sel.length()-1); 

      // Navigate into the sub-directory 
      if (sel.equals("..")) 
      { 
       m_dir = m_dir.substring(0, m_dir.lastIndexOf("/")); 
      } 
      else 
      { 
       m_dir += "/" + sel; 
      } 
      Selected_File_Name = Default_File_Name; 

      if ((new File(m_dir).isFile())) // If the selection is a regular file 
      { 
       m_dir = m_dir_old; 
       Selected_File_Name = sel; 
      } 

      updateDirectory(); 
     } 
    } 

    AlertDialog.Builder dialogBuilder = createDirectoryChooserDialog(dir, m_subdirs, 
      new SimpleFileDialogOnClickListener()); 

    dialogBuilder.setPositiveButton("Aceptar", new OnClickListener() 
    { 
     @Override 
     public void onClick(DialogInterface dialog, int which) 
     { 
      // Current directory chosen 
      // Call registered listener supplied with the chosen directory 
      if (m_SimpleFileDialogListener != null){ 
       { 
        if (Select_type == FileOpen || Select_type == FileSave) 
        { 
         Selected_File_Name= input_text.getText() +""; 
         m_SimpleFileDialogListener.onChosenDir(m_dir + "/" + Selected_File_Name);} 
        else 
        { 
         m_SimpleFileDialogListener.onChosenDir(m_dir); 
        } 
       } 
      } 
     } 
    }).setNegativeButton("Cancelar", null); 

    final AlertDialog dirsDialog = dialogBuilder.create(); 

    // Show directory chooser dialog 
    dirsDialog.show(); 
} 

private boolean createSubDir(String newDir) 
{ 
    File newDirFile = new File(newDir); 
    if (! newDirFile.exists()) return newDirFile.mkdir(); 
    else return false; 
} 

private List<String> getDirectories(String dir) 
{ 
    List<String> dirs = new ArrayList<String>(); 
    try 
    { 
     File dirFile = new File(dir); 

     // if directory is not the base sd card directory add ".." for going up one directory 
     if (! m_dir.equals(m_sdcardDirectory)) dirs.add(".."); 

     if (! dirFile.exists() || ! dirFile.isDirectory()) 
     { 
      return dirs; 
     } 

     for (File file : dirFile.listFiles()) 
     { 
      if (file.isDirectory()) 
      { 
       // Add "/" to directory names to identify them in the list 
       dirs.add(file.getName() + "/"); 
      } 
      else if (Select_type == FileSave || Select_type == FileOpen) 
      { 
       // Add file names to the list if we are doing a file save or file open operation 
       dirs.add(file.getName()); 
      } 
     } 
    } 
    catch (Exception e) {} 

    Collections.sort(dirs, new Comparator<String>() 
    { 
     public int compare(String o1, String o2) 
     { 
      return o1.compareTo(o2); 
     } 
    }); 
    return dirs; 
} 

////////////////////////////////////////////////////////////////////////////////////////////////////////// 
//////         START DIALOG DEFINITION         ////// 
////////////////////////////////////////////////////////////////////////////////////////////////////////// 
private AlertDialog.Builder createDirectoryChooserDialog(String title, List<String> listItems, 
                 DialogInterface.OnClickListener onClickListener) 
{ 
    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(m_context); 
    //////////////////////////////////////////////// 
    // Create title text showing file select type // 
    //////////////////////////////////////////////// 
    m_titleView1 = new TextView(m_context); 
    m_titleView1.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
    //m_titleView1.setTextAppearance(m_context, android.R.style.TextAppearance_Large); 
    //m_titleView1.setTextColor(m_context.getResources().getColor(android.R.color.black)); 

    if (Select_type == FileOpen ) m_titleView1.setText("Open:"); 
    if (Select_type == FileSave ) m_titleView1.setText("Save As:"); 
    if (Select_type == FolderChoose) m_titleView1.setText("Folder Select:"); 

    //need to make this a variable Save as, Open, Select Directory 
    m_titleView1.setGravity(Gravity.CENTER_VERTICAL); 
    // m_titleView1.setBackgroundColor(-12303292); // dark gray -12303292 
    m_titleView1.setTextColor(m_context.getResources().getColor(android.R.color.white)); 

    // Create custom view for AlertDialog title 
    LinearLayout titleLayout1 = new LinearLayout(m_context); 
    titleLayout1.setOrientation(LinearLayout.VERTICAL); 
    titleLayout1.addView(m_titleView1); 


    if (Select_type == FolderChoose || Select_type == FileSave) 
    { 
     /////////////////////////////// 
     // Create New Folder Button // 
     /////////////////////////////// 
     Button newDirButton = new Button(m_context); 
     newDirButton.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
     newDirButton.setText("New Folder"); 
     newDirButton.setOnClickListener(new View.OnClickListener() 
             { 
              @Override 
              public void onClick(View v) 
              { 
               final EditText input = new EditText(m_context); 

               // Show new folder name input dialog 
               new AlertDialog.Builder(m_context). 
                 setTitle("New Folder Name"). 
                 setView(input).setPositiveButton("Aceptar", new DialogInterface.OnClickListener() 
               { 
                public void onClick(DialogInterface dialog, int whichButton) 
                { 
                 Editable newDir = input.getText(); 
                 String newDirName = newDir.toString(); 
                 // Create new directory 
                 if (createSubDir(m_dir + "/" + newDirName)) 
                 { 
                  // Navigate into the new directory 
                  m_dir += "/" + newDirName; 
                  updateDirectory(); 
                 } 
                 else 
                 { 
                  Toast.makeText(m_context, "Failed to create '" 
                    + newDirName + "' folder", Toast.LENGTH_SHORT).show(); 
                 } 
                } 
               }).setNegativeButton("Cancelar", null).show(); 
              } 
             } 
     ); 
     titleLayout1.addView(newDirButton); 
    } 

    ///////////////////////////////////////////////////// 
    // Create View with folder path and entry text box // 
    ///////////////////////////////////////////////////// 
    LinearLayout titleLayout = new LinearLayout(m_context); 
    titleLayout.setOrientation(LinearLayout.VERTICAL); 

    m_titleView = new TextView(m_context); 
    m_titleView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
    // m_titleView.setBackgroundColor(-12303292); // dark gray -12303292 
    m_titleView.setTextColor(m_context.getResources().getColor(android.R.color.white)); 
    m_titleView.setGravity(Gravity.CENTER_VERTICAL); 
    m_titleView.setText(title); 

    titleLayout.addView(m_titleView); 

    if (Select_type == FileOpen || Select_type == FileSave) 
    { 
     input_text = new EditText(m_context); 
     input_text.setText(Default_File_Name); 
     titleLayout.addView(input_text); 
    } 
    ////////////////////////////////////////// 
    // Set Views and Finish Dialog builder // 
    ////////////////////////////////////////// 
    dialogBuilder.setView(titleLayout); 
    dialogBuilder.setCustomTitle(titleLayout1); 
    m_listAdapter = createListAdapter(listItems); 
    dialogBuilder.setSingleChoiceItems(m_listAdapter, -1, onClickListener); 
    dialogBuilder.setCancelable(false); 
    return dialogBuilder; 
} 

private void updateDirectory() 
{ 
    m_subdirs.clear(); 
    m_subdirs.addAll(getDirectories(m_dir)); 
    m_titleView.setText(m_dir); 
    m_listAdapter.notifyDataSetChanged(); 
    //#scorch 
    if (Select_type == FileSave || Select_type == FileOpen) 
    { 
     input_text.setText(Selected_File_Name); 
    } 
} 

private ArrayAdapter<String> createListAdapter(List<String> items) 
{ 
    return new ArrayAdapter<String>(m_context, android.R.layout.select_dialog_item, android.R.id.text1, items) 
    { 
     @Override 
     public View getView(int position, View convertView, ViewGroup parent) 
     { 
      View v = super.getView(position, convertView, parent); 
      if (v instanceof TextView) 
      { 
       // Enable list item (directory) text wrapping 
       TextView tv = (TextView) v; 
       tv.getLayoutParams().height = LayoutParams.WRAP_CONTENT; 
       tv.setEllipsize(null); 
      } 
      return v; 
     } 
    }; 
} 

MainActivity.java

public class MainActivity extends Activity implements 
    AdapterContactos.customButtonListener { 

TextView contenido; 
ListView lista; 
Button cargar,agregarTodos; 

AdapterContactos adapter; 
ArrayList<Contact> contactos; 
ArrayList<Contact> contactos2; 


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

    contenido = (TextView)findViewById(R.id.tvcontenido); 
    lista = (ListView)findViewById(R.id.listview); 
    cargar = (Button)findViewById(R.id.btrecuperar); 
    agregarTodos = (Button)findViewById(R.id.btagregartodos); 



    contactos = new ArrayList<>(); 
    contactos2 = new ArrayList<>(); 
    cargarDataBase(); 

    if(contactos2.isEmpty()){ 
     agregarTodos.setEnabled(false); 
    } 

    cargar.setOnClickListener(new Button.OnClickListener(){ 

     String m_chosen; 
     @Override 
     public void onClick(View v) { 
      ///////////////////////////////////////////////////////////////////////////////////////////////// 
      //Create FileOpenDialog and register a callback 
      ///////////////////////////////////////////////////////////////////////////////////////////////// 
      SimpleFileDialog FileOpenDialog = new SimpleFileDialog(MainActivity.this, "FileOpen", 
        new SimpleFileDialog.SimpleFileDialogListener() 
        { 
         @Override 
         public void onChosenDir(String chosenDir) 
         { 
          // The code in this function will be executed when the dialog OK button is pushed 
          m_chosen = chosenDir; 

          contenido.setText(m_chosen); 
          Toast.makeText(MainActivity.this, "Archivo escogido File: " + 
            m_chosen, Toast.LENGTH_LONG).show(); 
         } 
        }); 

      //You can change the default filename using the public variable "Default_File_Name" 
      FileOpenDialog.Default_File_Name = ""; 
      FileOpenDialog.chooseFile_or_Dir(); 

      ///////////////////////////////////////////////////////////////////////////////////////////////// 

     } 
    }); 
} 

私のGradle

android { 
compileSdkVersion 24 
buildToolsVersion "24.0.1" 
defaultConfig { 
    applicationId "com.example.carlos.lectura" 
    minSdkVersion 15 
    targetSdkVersion 24 
    versionCode 1 
    versionName "1.0" 
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 
} 
buildTypes { 
    release { 
     minifyEnabled false 
     proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
    } 
} 
} 

dependencies { 
compile fileTree(dir: 'libs', include: ['*.jar']) 
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 
    exclude group: 'com.android.support', module: 'support-annotations' 
}) 
compile 'com.android.support:appcompat-v7:24.2.1' 
testCompile 'junit:junit:4.12' 
} 

Answer 1

Android 6.0ために必要な権限の一つはWRITE_EXTERNAL_STORAGE（暗黙的READ_EXTERNAL_STORAGE）です：

あなたは、このメソッドを呼び出す外部ストレージの読み取り前に許可を要求することができます。

あなたが検証することができます実際に

private void checkExternalStoragePermission() { 
    int permissionCheck = ContextCompat.checkSelfPermission(
      this, Manifest.permission.WRITE_EXTERNAL_STORAGE); 
    if (permissionCheck != PackageManager.PERMISSION_GRANTED) { 
     Log.i("Permission", "We dont have permission."); 
      ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 225); 
    } else { 
     Log.i("Permission", "You already have permission!"); 
    } 
} 

要求のアクセス許可のためのメソッドの呼び出しのみOSのAndroid 6.0+：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){ 
    //Check permissions for Android 6.0+ 
    checkExternalStoragePermission(); 
}