Android Open Source - Android_OSM_offlinemap File Explorer Activity

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Back to project page Android_OSM_offlinemap.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.vellut.offlinemap;
/*from   w  ww .j  a v a  2 s.c  o  m*/
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.vellut.offlinemap.kansai.R;

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;

import static com.vellut.offlinemap.Utils.e;

public class FileExplorerActivity extends Activity {

  // Check if the first level of the directory structure is the one showing
  private File rootDirectory;
  private Boolean firstLevel = true;
  private ArrayList<Item> fileList;
  private File currentFolder;
  private String selectedFile;
  private boolean chooseDirectory;
  private String extensionFilter;

  ArrayAdapter<Item> adapter;
  ListView listViewFiles;
  TextView textViewCurrentFolder;

  @Override
  public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_file_explorer);

    Bundle configuration = savedInstanceState;
    if(savedInstanceState == null) {
      configuration = getIntent().getExtras();
    }
    initData(configuration);
    configureUI();
  }

  private void initData(Bundle extras) {
    rootDirectory = Environment.getExternalStorageDirectory();

    if (extras != null) {
      currentFolder = new File(extras.getString(Utils.EXTRA_START_PATH,
          rootDirectory.getAbsolutePath()));
      chooseDirectory = extras.getBoolean(Utils.EXTRA_CHOOSE_DIRECTORY_ONLY, false);
      extensionFilter = extras.getString(Utils.EXTRA_EXTENSION_FILTER, null);
    } else {
      currentFolder = rootDirectory;
      chooseDirectory = false;
    }

    firstLevel = currentFolder.getAbsolutePath().equals(rootDirectory.getAbsolutePath());

    fileList = new ArrayList<Item>();
    adapter = new ArrayAdapter<Item>(this,
        android.R.layout.select_dialog_item, android.R.id.text1,
        fileList) {
      @Override
      public View getView(int position, View convertView, ViewGroup parent) {
        // creates view
        View view = super.getView(position, convertView, parent);
        TextView textView = (TextView) view
            .findViewById(android.R.id.text1);

        // put the image on the text view
        textView.setCompoundDrawablesWithIntrinsicBounds(
            fileList.get(position).icon, 0, 0, 0);

        // add margin between image and text (support various screen
        // densities)
        int dp5 = (int) (5 * getResources().getDisplayMetrics().density + 0.5f);
        textView.setCompoundDrawablePadding(dp5);

        return view;
      }
    };

    loadFileList();
  }

  private void configureUI() {
    if (!chooseDirectory) {
      ViewGroup buttonBar = (ViewGroup) findViewById(R.id.buttonBar);
      View btnOk = findViewById(R.id.btnOk);
      buttonBar.removeView(btnOk);

      setTitle(R.string.file_explorer_activity_choose_file);
    } else {
      setTitle(R.string.file_explorer_activity_choose_folder);
    }

    textViewCurrentFolder = (TextView) findViewById(R.id.textViewCurrentFolder);
    setCurrentFolderText();

    listViewFiles = (ListView) findViewById(R.id.listViewFiles);

    listViewFiles.setAdapter(adapter);
    listViewFiles.setOnItemClickListener(new AdapterView.OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        selectedFile = fileList.get(position).file;
        File sel = new File(currentFolder, selectedFile);
        if (sel.isDirectory()) {
          // Adds chosen directory to list
          currentFolder = sel;
          firstLevel = false;

          setCurrentFolderText();
          adapter.clear();
          loadFileList();
          adapter.notifyDataSetChanged();

          listViewFiles.setSelectionAfterHeaderView();
        } else if (!firstLevel && position == 0) {
          // 'up' was clicked

          // currentFolder modified to exclude present directory
          String sCurrentFolder = currentFolder.getAbsolutePath();
          currentFolder = new File(sCurrentFolder.substring(0,
              sCurrentFolder.lastIndexOf("/")));
          firstLevel = currentFolder.getAbsolutePath().equals(rootDirectory.getAbsolutePath());

          setCurrentFolderText();
          adapter.clear();
          loadFileList();
          adapter.notifyDataSetChanged();

          listViewFiles.setSelectionAfterHeaderView();
        } else if (!chooseDirectory) {
          // send Intent result
          Intent data = new Intent();
          data.putExtra(Utils.EXTRA_FILE_PATH, sel.getAbsolutePath());
          setResult(RESULT_OK, data);
          FileExplorerActivity.this.finish();
        }
      }
    });
  }

  private void setCurrentFolderText() {
    String relPath = Utils.pathRelativeTo(currentFolder.getAbsolutePath(),
        rootDirectory.getAbsolutePath());
    relPath = "/" + relPath;
    textViewCurrentFolder.setText(getString(R.string.file_explorer_activity_in_folder, relPath));
  }

  @Override
  public void onSaveInstanceState(Bundle outstate) {
    outstate.putString(Utils.EXTRA_START_PATH, currentFolder.getAbsolutePath());
    outstate.putBoolean(Utils.EXTRA_CHOOSE_DIRECTORY_ONLY, chooseDirectory);
    outstate.putString(Utils.EXTRA_EXTENSION_FILTER, extensionFilter);
  }

  private void loadFileList() {
    try {
      currentFolder.mkdirs();
    } catch (SecurityException e) {
      e("unable to write on the sd card ", e);
    }

    if (currentFolder.exists()) {
      FilenameFilter filter = new FilenameFilter() {
        @Override
        public boolean accept(File dir, String fileName) {
          File sel = new File(dir, fileName);
          String extension = Utils.getExtension(fileName);
          return (!sel.isHidden() &&
              (sel.isDirectory() ||
                  (!chooseDirectory &&
                      (sel.isFile() &&
                          (extensionFilter == null ||
                              extensionFilter.equals(extension))))));
        }
      };

      String[] fList = currentFolder.list(filter);
      if (!firstLevel) {
        Item itemUp = new Item(getString(R.string.file_explorer_activity_up));
        itemUp.icon = R.drawable.directory_up;
        fileList.add(itemUp);
      }

      for (int i = 0; i < fList.length; i++) {
        Item item = new Item(fList[i]);
        File sel = new File(currentFolder, fList[i]);
        if (sel.isDirectory()) {
          item.icon = R.drawable.directory_icon;
        } else {
          item.icon = R.drawable.file_icon;
        }
        fileList.add(item);
      }
    }
  }

  private class Item {
    public String file;
    public int icon;

    public Item(String file) {
      this.file = file;
    }

    @Override
    public String toString() {
      return file;
    }
  }

  public void onOk(View v) {
    // only for chooseDirectory == true
    Intent data = new Intent();
    data.putExtra(Utils.EXTRA_FILE_PATH, currentFolder.getAbsolutePath());
    setResult(RESULT_OK, data);
    finish();
  }

  public void onCancel(View v) {
    Intent data = new Intent();
    setResult(RESULT_CANCELED, data);
    finish();
  }
}

Java Source Code List

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