How to do file open dialog

I just started developing android app on windows platform with Android 2.1. I have run into an issue for opening a file dialog that allows a user to choose a file from sdcard or from the android phone. I am using an emulator API level 7 and platform 2.1 update. I have a sample code here that I am using. But it 开发者_如何转开发doesn't work. Can anybody take a look at it and correct it? Thank you.

    button1.setOnClickListener(new OnClickListener() {
    int PICK_REQUEST_CODE = 0;

    @Override
    public void onClick(View v) {
    System.out.println("Button is clicked.");

    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_PICK);
    Uri startDir = Uri.fromFile(new File("/"));
    // Files and directories !
    intent.setDataAndType(startDir,
        "vnd.android.cursor.dir/lysesoft.andexplorer.file");
    // Title
    intent.putExtra("explorer_title", "Select a file");
    // Optional colors
    intent.putExtra("browser_title_background_color", "440000AA");
    intent.putExtra("browser_title_foreground_color", "FFFFFFFF");
    intent.putExtra("browser_list_background_color", "00000066");
    // Optional font scale
    intent.putExtra("browser_list_fontscale", "120%");
    // Optional 0=simple list, 1 = list with filename and size, 2
    // = list with filename, size and date.
    intent.putExtra("browser_list_layout", "2");
    startActivityForResult(intent, PICK_REQUEST_CODE);

    }

I have created FolderLayout which may help you. The concept came from this

folderview.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView android:id="@+id/path" android:text="Path"
        android:layout_width="match_parent" android:layout_height="wrap_content"></TextView>
    <ListView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/list"></ListView>

</LinearLayout>

FolderLayout.java

package com.testsample.activity;




   public class FolderLayout extends LinearLayout implements OnItemClickListener {

    Context context;
    IFolderItemListener folderListener;
    private List<String> item = null;
    private List<String> path = null;
    private String root = "/";
    private TextView myPath;
    private ListView lstView;

    public FolderLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        // TODO Auto-generated constructor stub
        this.context = context;


        LayoutInflater layoutInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = layoutInflater.inflate(R.layout.folderview, this);

        myPath = (TextView) findViewById(R.id.path);
        lstView = (ListView) findViewById(R.id.list);

        Log.i("FolderView", "Constructed");
        getDir(root, lstView);

    }

    public void setIFolderItemListener(IFolderItemListener folderItemListener) {
        this.folderListener = folderItemListener;
    }

    //Set Directory for view at anytime
    public void setDir(String dirPath){
        getDir(dirPath, lstView);
    }


    private void getDir(String dirPath, ListView v) {

        myPath.setText("Location: " + dirPath);
        item = new ArrayList<String>();
        path = new ArrayList<String>();
        File f = new File(dirPath);
        File[] files = f.listFiles();

        if (!dirPath.equals(root)) {

            item.add(root);
            path.add(root);
            item.add("../");
            path.add(f.getParent());

        }
        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            path.add(file.getPath());
            if (file.isDirectory())
                item.add(file.getName() + "/");
            else
                item.add(file.getName());

        }

        Log.i("Folders", files.length + "");

        setItemList(item);

    }

    //can manually set Item to display, if u want
    public void setItemList(List<String> item){
        ArrayAdapter<String> fileList = new ArrayAdapter<String>(context,
                R.layout.row, item);

        lstView.setAdapter(fileList);
        lstView.setOnItemClickListener(this);
    }


    public void onListItemClick(ListView l, View v, int position, long id) {
        File file = new File(path.get(position));
        if (file.isDirectory()) {
            if (file.canRead())
                getDir(path.get(position), l);
            else {
//what to do when folder is unreadable
                if (folderListener != null) {
                    folderListener.OnCannotFileRead(file);

                }

            }
        } else {

//what to do when file is clicked
//You can add more,like checking extension,and performing separate actions
            if (folderListener != null) {
                folderListener.OnFileClicked(file);
            }

        }
    }

    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        onListItemClick((ListView) arg0, arg0, arg2, arg3);
    }

}

And an Interface IFolderItemListener to add what to do when a fileItem is clicked

IFolderItemListener.java

public interface IFolderItemListener {

    void OnCannotFileRead(File file);//implement what to do folder is Unreadable
    void OnFileClicked(File file);//What to do When a file is clicked
}

Also an xml to define the row

row.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rowtext" android:layout_width="fill_parent"
    android:textSize="23sp" android:layout_height="match_parent"/>

How to Use in your Application

In your xml,

folders.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:orientation="horizontal" android:weightSum="1">
    <com.testsample.activity.FolderLayout android:layout_height="match_parent" layout="@layout/folderview"
        android:layout_weight="0.35"
        android:layout_width="200dp" android:id="@+id/localfolders"></com.testsample.activity.FolderLayout></LinearLayout>

In Your Activity,

SampleFolderActivity.java

public class SampleFolderActivity extends Activity implements IFolderItemListener {

    FolderLayout localFolders;

    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        localFolders = (FolderLayout)findViewById(R.id.localfolders);
        localFolders.setIFolderItemListener(this);
            localFolders.setDir("./sys");//change directory if u want,default is root   

    }

    //Your stuff here for Cannot open Folder
    public void OnCannotFileRead(File file) {
        // TODO Auto-generated method stub
        new AlertDialog.Builder(this)
        .setIcon(R.drawable.icon)
        .setTitle(
                "[" + file.getName()
                        + "] folder can't be read!")
        .setPositiveButton("OK",
                new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog,
                            int which) {


                    }
                }).show();

    }


    //Your stuff here for file Click
    public void OnFileClicked(File file) {
        // TODO Auto-generated method stub
        new AlertDialog.Builder(this)
        .setIcon(R.drawable.icon)
        .setTitle("[" + file.getName() + "]")
        .setPositiveButton("OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,
                            int which) {


                    }

                }).show();
    }

}

Import the libraries needed. Hope these help you...

Your code assumes that the Lyesoft's AndExplorer is installed on device or emulator. Is it?

You can also try to use this file dialog http://code.google.com/p/android-file-dialog/ , there's a complete guide how to integrate it into your app