Android Open Source - Notepad Note View Fragment

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License

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

/* Copyright 2014 Braden Farmer
 *//from  w w  w.j av  a 2  s  .  c o  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.farmerbb.notepad;

import android.app.Activity;
import android.app.DialogFragment;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;

public class NoteViewFragment extends Fragment {
  
  private TextView noteContents;
  String filename = "";
  String contentsOnLoad = "";
  int firstLoad;

    // Receiver used to close fragment when a note is deleted
    public class DeleteNotesReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String[] filesToDelete = intent.getStringArrayExtra("files");

            for(Object file : filesToDelete) {
                if(filename.equals(file)) {
          // Add NoteListFragment or WelcomeFragment
          Fragment fragment;
          if(getActivity().findViewById(R.id.layoutMain).getTag().equals("main-layout-normal"))
            fragment = new NoteListFragment();
          else
            fragment = new WelcomeFragment();

          getFragmentManager()
            .beginTransaction()
            .replace(R.id.noteViewEdit, fragment, "NoteListFragment")
            .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE)
            .commit();
        }
            }
        }
    }

    IntentFilter filter = new IntentFilter("com.farmerbb.notepad.DELETE_NOTES");
    DeleteNotesReceiver receiver = new DeleteNotesReceiver();
  
  /* The activity that creates an instance of this fragment must
   * implement this interface in order to receive event call backs. */
  public interface Listener {
    public void showDeleteDialog();
    public String loadNote(String filename) throws IOException;
  }

  // Use this instance of the interface to deliver action events
  Listener listener;

  // Override the Fragment.onAttach() method to instantiate the Listener
  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    // Verify that the host activity implements the callback interface
    try {
      // Instantiate the Listener so we can send events to the host
      listener = (Listener) activity;
    } catch (ClassCastException e) {
      // The activity doesn't implement the interface, throw exception
      throw new ClassCastException(activity.toString()
                     + " must implement Listener");
    }
  }  

  @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_note_view, container, false);
  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

        // Set values
        setRetainInstance(true);
    setHasOptionsMenu(true);

        // Change window title
        getActivity().setTitle(getResources().getString(R.string.view_note));

    // Show the Up button in the action bar.
        getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);

        // Set up content view
        noteContents = (TextView) getActivity().findViewById(R.id.textView);
    
    // Get filename of saved note
    filename = getArguments().getString("filename");

    // Load note contents
    try {
      contentsOnLoad = listener.loadNote(filename);
    } catch (IOException e) {
      showToast(R.string.error_loading_note);

      // Add NoteListFragment or WelcomeFragment
      Fragment fragment;
      if(getActivity().findViewById(R.id.layoutMain).getTag().equals("main-layout-normal"))
        fragment = new NoteListFragment();
      else
        fragment = new WelcomeFragment();

      getFragmentManager()
        .beginTransaction()
        .replace(R.id.noteViewEdit, fragment, "NoteListFragment")
        .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE)
        .commit();
    }
    
    // Set TextView contents
    noteContents.setText(contentsOnLoad);
      
    // Show a toast message if this is the user's first time viewing a note
    SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
    firstLoad = sharedPref.getInt("first-load", 0);
    if(firstLoad == 0) {
      // Show dialog with info
      DialogFragment firstLoad = new FirstViewDialogFragment();
      firstLoad.show(getFragmentManager(), "firstloadfragment");

      // Set first-load preference to 1; we don't need to show the dialog anymore
      SharedPreferences.Editor editor = sharedPref.edit();
      editor.putInt("first-load", 1);
      editor.apply();
    }

    // Make TextView edit note onClick for convenience
    noteContents.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
                Bundle bundle = new Bundle();
                bundle.putString("filename", filename);

                Fragment fragment = new NoteEditFragment();
                fragment.setArguments(bundle);

                getFragmentManager()
                        .beginTransaction()
                        .replace(R.id.noteViewEdit, fragment, "NoteEditFragment")
                        .commit();
      }
    });
  }

    // Register and unregister DeleteNotesReceiver
    @Override
    public void onStart() {
        super.onStart();

        getActivity().registerReceiver(receiver, filter);
    }

    @Override
    public void onStop() {
        super.onStop();

        getActivity().unregisterReceiver(receiver);
    }
  
  @Override
  public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.note_view, menu);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case android.R.id.home:
        // Override default Android "up" behavior to instead mimic the back button
        getActivity().onBackPressed();
        return true;

        // Edit button
      case R.id.action_edit:
                Bundle bundle = new Bundle();
                bundle.putString("filename", filename);

                Fragment fragment = new NoteEditFragment();
                fragment.setArguments(bundle);

                getFragmentManager()
                        .beginTransaction()
                        .replace(R.id.noteViewEdit, fragment, "NoteEditFragment")
                        .commit();

        return true;

        // Delete button
      case R.id.action_delete:
        listener.showDeleteDialog();
        return true;

        // Share menu item
      case R.id.action_share:
        // Set current note contents to a String
        String contents = noteContents.getText().toString();

        // Send a share intent
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_SEND);
        intent.putExtra(Intent.EXTRA_TEXT, contents);
        intent.setType("text/plain");

        // Verify that the intent will resolve to an activity, and send
        if(intent.resolveActivity(getActivity().getPackageManager()) != null)
          startActivity(Intent.createChooser(intent, getResources().getText(R.string.send_to)));

        return true;             
      default:
        return super.onOptionsItemSelected(item);
    }
  }

  private void deleteNote(String filename) {    
    // Build the pathname to delete file, then perform delete operation
    File fileToDelete = new File(getActivity().getFilesDir() + File.separator + filename);
    fileToDelete.delete();
  }

    private void showToast(int message) {
        Toast toast = Toast.makeText(getActivity(), getResources().getString(message), Toast.LENGTH_SHORT);
        toast.show();
    }

  public void onDeleteDialogPositiveClick() {
    // User touched the dialog's positive button
    deleteNote(filename);
    showToast(R.string.note_deleted);

        if(getActivity().findViewById(R.id.layoutMain).getTag().equals("main-layout-large")) {
            // Send broadcast to NoteListFragment to refresh list of notes
            Intent listNotesIntent = new Intent();
            listNotesIntent.setAction("com.farmerbb.notepad.LIST_NOTES");
            getActivity().sendBroadcast(listNotesIntent);
        }
    
    // Add NoteListFragment or WelcomeFragment
    Fragment fragment;
    if(getActivity().findViewById(R.id.layoutMain).getTag().equals("main-layout-normal"))
      fragment = new NoteListFragment();
    else
      fragment = new WelcomeFragment();

    getFragmentManager()
      .beginTransaction()
      .replace(R.id.noteViewEdit, fragment, "NoteListFragment")
      .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE)
      .commit();
  }
  
  // Nested class used to listen for keyboard shortcuts
        public void dispatchKeyShortcutEvent(int keyCode) {
      switch(keyCode){

          // CTRL+E: Edit
        case KeyEvent.KEYCODE_E:
                    Bundle bundle = new Bundle();
                    bundle.putString("filename", filename);

                    Fragment fragment = new NoteEditFragment();
                    fragment.setArguments(bundle);

          getFragmentManager()
            .beginTransaction()
            .replace(R.id.noteViewEdit, fragment, "NoteEditFragment")
            .commit();
          break;

          // CTRL+D: Delete
        case KeyEvent.KEYCODE_D:
          // Show delete dialog
          listener.showDeleteDialog();
          break;

          // CTRL+H: Share
        case KeyEvent.KEYCODE_H:
          // Set current note contents to a String
          String contents = noteContents.getText().toString();

          // Send a share intent
          Intent shareIntent = new Intent();
          shareIntent.setAction(Intent.ACTION_SEND);
          shareIntent.putExtra(Intent.EXTRA_TEXT, contents);
          shareIntent.setType("text/plain");

          // Verify that the intent will resolve to an activity, and send
          if(shareIntent.resolveActivity(getActivity().getPackageManager()) != null)
            startActivity(Intent.createChooser(shareIntent, getResources().getText(R.string.send_to)));

          break;
      }
        }
  
    public void onBackPressed() {
      // Add NoteListFragment or WelcomeFragment
      Fragment fragment;
      if(getActivity().findViewById(R.id.layoutMain).getTag().equals("main-layout-normal"))
        fragment = new NoteListFragment();
      else
        fragment = new WelcomeFragment();

      getFragmentManager()
                .beginTransaction()
                .replace(R.id.noteViewEdit, fragment, "NoteListFragment")
                .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE)
                .commit();
    }
    
  public String getFilename() {
    return getArguments().getString("filename");
  }
}
Java Source Code List
