Android Open Source - FindYourWords File Chooser Activity

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License

The source code is released under:

Apache License

Java Source Code

/* 
 * Copyright (C) 2013 Paul Burke//w  w w  .  j a v a 2s .co m
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */ 

package com.ipaulpro.afilechooser;

import android.app.ActionBar;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentManager.BackStackEntry;
import android.support.v4.app.FragmentManager.OnBackStackChangedListener;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import java.io.File;

/**
 * Main Activity that handles the FileListFragments 
 * 
 * @version 2013-06-25
 * 
 * @author paulburke (ipaulpro)
 * 
 */
public class FileChooserActivity extends FragmentActivity implements
    OnBackStackChangedListener {

    public static final String PATH = "path";
  public static final String EXTERNAL_BASE_PATH = Environment
      .getExternalStorageDirectory().getAbsolutePath();

  private static final boolean HAS_ACTIONBAR = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;

  private FragmentManager mFragmentManager;
  private BroadcastReceiver mStorageListener = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
      Toast.makeText(context, R.string.storage_removed, Toast.LENGTH_LONG).show();
      finishWithResult(null);
    }
  };
  
  private String mPath;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.chooser);

    mFragmentManager = getSupportFragmentManager();
    mFragmentManager.addOnBackStackChangedListener(this);

    if (savedInstanceState == null) {
      mPath = EXTERNAL_BASE_PATH;
      addFragment();
    } else {
      mPath = savedInstanceState.getString(PATH);
    }

    setTitle(mPath);
  }

  @Override
  protected void onPause() {
    super.onPause();
    
    unregisterStorageListener();
  }

  @Override
  protected void onResume() {
    super.onResume();
    
    registerStorageListener();
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    
    outState.putString(PATH, mPath);
  }

  @Override
  public void onBackStackChanged() {
    
    int count = mFragmentManager.getBackStackEntryCount();
    if (count > 0) {
            BackStackEntry fragment = mFragmentManager.getBackStackEntryAt(count - 1);
            mPath = fragment.getName();
    } else {
        mPath = EXTERNAL_BASE_PATH;
    }
    
    setTitle(mPath);
    if (HAS_ACTIONBAR) invalidateOptionsMenu();
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
        if (HAS_ACTIONBAR) {
            boolean hasBackStack = mFragmentManager.getBackStackEntryCount() > 0;
            
            ActionBar actionBar = getActionBar();
            actionBar.setDisplayHomeAsUpEnabled(hasBackStack);
            actionBar.setHomeButtonEnabled(hasBackStack);
        }
      
      return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      switch (item.getItemId()) {
          case android.R.id.home:
              mFragmentManager.popBackStack();
              return true;
      }

      return super.onOptionsItemSelected(item);
  }

  /**
   * Add the initial Fragment with given path.
   */
  private void addFragment() {
    FileListFragment fragment = FileListFragment.newInstance(mPath);
    mFragmentManager.beginTransaction()
        .add(R.id.explorer_fragment, fragment).commit();
  }

  /**
   * "Replace" the existing Fragment with a new one using given path.
   * We're really adding a Fragment to the back stack.
   * 
   * @param file The file (directory) to display.
   */
  private void replaceFragment(File file) {
        mPath = file.getAbsolutePath();

        FileListFragment fragment = FileListFragment.newInstance(mPath);
    mFragmentManager.beginTransaction()
        .replace(R.id.explorer_fragment, fragment)
        .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
        .addToBackStack(mPath).commit();
  }

  /**
   * Finish this Activity with a result code and URI of the selected file.
   * 
   * @param file The file selected.
   */
  private void finishWithResult(File file) {
    if (file != null) {
      Uri uri = Uri.fromFile(file);
      setResult(RESULT_OK, new Intent().setData(uri));
      finish();
    } else {
      setResult(RESULT_CANCELED);  
      finish();
    }
  }
  
  /**
   * Called when the user selects a File
   * 
   * @param file The file that was selected
   */
  protected void onFileSelected(File file) {
    if (file != null) {
      if (file.isDirectory()) {
        replaceFragment(file);
      } else {
        finishWithResult(file);  
      }
    } else {
      Toast.makeText(FileChooserActivity.this, R.string.error_selecting_file, Toast.LENGTH_SHORT).show();
    }
  }
  
  /**
   * Register the external storage BroadcastReceiver.
   */
  private void registerStorageListener() {
    IntentFilter filter = new IntentFilter();
    filter.addAction(Intent.ACTION_MEDIA_REMOVED);
    registerReceiver(mStorageListener, filter);
  }

  /**
   * Unregister the external storage BroadcastReceiver.
   */
  private void unregisterStorageListener() {
    unregisterReceiver(mStorageListener);
  }
}

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