Android Open Source - Langleo Select File

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License

The source code is released under:
Apache License
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Java Source Code

package com.atteo.langleo_trial.activities;
//from w ww  .j  ava2s.  c  o m
import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.HashMap;

import android.app.ListActivity;
import android.content.Intent;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

import com.atteo.langleo_trial.Langleo;
import com.atteo.langleo_trial.R;

public class SelectFile extends ListActivity {
  private ArrayList<HashMap<String, String>> datalist;
  private FileListAdapter adapter;

  private String currentDirectory;

  @Override
  public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.select_list);
    ListView list = getListView();
    list.setItemsCanFocus(false);
    list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

    if (savedInstanceState != null) {
      currentDirectory = savedInstanceState
          .getString("current_directory");
    } else {
      currentDirectory = Environment.getExternalStorageDirectory() + "/"
          + Langleo.DIR_NAME;
    }

    list.setOnItemClickListener(new OnItemClickListener() {
      public void onItemClick(AdapterView<?> adapter, View view,
          int position, long id) {
        if (!SelectFile.this.adapter.isDirectory(position))
          return;

        currentDirectory = new File(datalist.get(position).get(
            "fullpath")).getAbsolutePath();
        refreshList();
      }

    });

    Button button = (Button) findViewById(R.id.select_file_ok);
    button.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        Intent intent = new Intent();
        ListView list = getListView();

        int len = list.getCount();
        boolean found = false;
        int type;
        HashMap<String, String> map;
        for (int i = 0; i < len; i++) {
          type = adapter.getItemViewType(i);
          if (type == adapter.VIEWTYPE_FILE && list.isItemChecked(i)) {
            found = true;
            map = datalist.get(i);
            Bundle b = new Bundle();
            b.putString("filename", map.get("filename"));
            b.putString("fullpath", map.get("fullpath"));
            intent.putExtra(map.get("filename"), b);
          }

        }
        if (!found)
          return;

        setResult(RESULT_OK, intent);
        finish();
      }

    });

    button = (Button) findViewById(R.id.select_file_select_all);
    button.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        ListView l = getListView();
        int len = l.getCount();
        for (int i = 0; i < len; i++) {
          l.setItemChecked(i, true);
        }
      }
    });

    button = (Button) findViewById(R.id.select_file_deselect_all);
    button.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        ListView l = getListView();
        int len = l.getCount();
        for (int i = 0; i < len; i++) {
          l.setItemChecked(i, false);
        }
      }

    });

    refreshList();
  }

  @Override
  protected void onSaveInstanceState(Bundle b) {
    b.putString("current_directory", currentDirectory);
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK && datalist.size() > 0
        && datalist.get(0).get("filename").equals("..")) {
      currentDirectory = new File(datalist.get(0).get("fullpath"))
          .getAbsolutePath();
      refreshList();
      return true;

    }
    return super.onKeyDown(keyCode, event);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.select_file, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem menuItem) {

    switch (menuItem.getItemId()) {
    case R.id.select_file_help:
      showHelp();
      break;
    }
    return true;
  }

  private void showHelp() {
    Intent intent = new Intent(this, Help.class);
    intent.putExtra("part", "select_file");
    startActivity(intent);
  }

  public void refreshList() {
    datalist = new ArrayList<HashMap<String, String>>();
    adapter = new FileListAdapter();
    ListView list = getListView();

    File f = new File(currentDirectory);
    if (!f.exists()) {
      f.mkdir();
    }
    File[] files = f.listFiles(new FileFilter() {

      public boolean accept(File pathname) {
        if (pathname.isDirectory())
          return true;
        return false;
      }

    });
    HashMap<String, String> h;
    if (isInSubdirectory()) {
      h = new HashMap<String, String>();
      h.put("fullpath", f.getParent());
      h.put("filename", "..");

      datalist.add(h);
      adapter.addDirectory("..");
    }

    if (files != null)
      for (File file : files) {
        h = new HashMap<String, String>();
        h.put("fullpath", file.getAbsolutePath());
        h.put("filename", file.getName());
        datalist.add(h);
        adapter.addDirectory(file.getName());
      }
    files = f.listFiles(new FileFilter() {

      public boolean accept(File pathname) {
        if (pathname.getName().endsWith(".txt"))
          return true;
        return false;
      }

    });
    if (files != null)
      for (File file : files) {
        h = new HashMap<String, String>();
        h.put("fullpath", file.getAbsolutePath());
        h.put("filename", file.getName());
        datalist.add(h);

        adapter.addFile(file.getName());
      }

    list.setAdapter(adapter);
  }

  private boolean isInSubdirectory() {
    return !currentDirectory.equals(Environment
        .getExternalStorageDirectory()
        + "/" + Langleo.DIR_NAME);
  }

  private class FileListAdapter implements ListAdapter {

    ArrayList<DataSetObserver> observers = new ArrayList<DataSetObserver>();

    ArrayList<String> directories = new ArrayList<String>();
    ArrayList<String> files = new ArrayList<String>();

    public final int VIEWTYPE_DIR = 0;
    public final int VIEWTYPE_FILE = 1;

    @Override
    public void finalize() {
      int len = observers.size();
      for (int i = 0; i < len; i++)
        observers.get(i).onInvalidated();
    }

    private void notifyObservers() {
      int len = observers.size();
      for (int i = 0; i < len; i++)
        observers.get(i).onChanged();
    }

    public void addDirectory(String name) {
      directories.add(name);
      notifyObservers();
    }

    public void addFile(String name) {
      files.add(name);
      notifyObservers();
    }

    public boolean areAllItemsEnabled() {
      return true;
    }

    public boolean isEnabled(int position) {
      return true;
    }

    public int getCount() {
      return directories.size() + files.size();
    }

    public Object getItem(int position) {
      if (position < directories.size())
        return directories.get(position);
      if (position - directories.size() < files.size())
        return files.get(position - directories.size());
      return null;
    }

    public long getItemId(int position) {
      return position;
    }

    public int getItemViewType(int position) {
      if (position < directories.size())
        return VIEWTYPE_DIR;
      return VIEWTYPE_FILE;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
      TextView v;
      if (position < directories.size()) {

        if (convertView != null) {
          v = (TextView) convertView;
        } else
          v = (TextView) View.inflate(SelectFile.this,
              R.layout.dir_item, null);
        v.setText(directories.get(position));
      } else {
        boolean casts = true;

        if (convertView != null && casts) {
          v = (TextView) convertView;
        } else
          v = (TextView) View.inflate(SelectFile.this,
              R.layout.file_item, null);
        v.setText(files.get(position - directories.size()));
      }
      return v;
    }

    public int getViewTypeCount() {
      return 2;
    }

    public boolean isDirectory(int position) {
      return position < directories.size();
    }

    public boolean hasStableIds() {
      return false;
    }

    public boolean isEmpty() {
      return directories.size() + files.size() == 0;
    }

    public void registerDataSetObserver(DataSetObserver observer) {
      observers.add(observer);
    }

    public void unregisterDataSetObserver(DataSetObserver observer) {
      observers.remove(observer);
    }

  }
}
Java Source Code List
