Improve documentation

app/src/main/java/org/isoron/uhabits/models/Habit.java

@@ -259,7 +259,7 @@ public class Habit
         return id;
     }
 
-    public void setId(Long id)
+    public void setId(@Nullable Long id)
     {
         this.id = id;
     }
@@ -267,12 +267,13 @@ public class Habit
     /**
      * Name of the habit
      */
+    @NonNull
     public String getName()
     {
         return name;
     }
 
-    public void setName(String name)
+    public void setName(@NonNull String name)
     {
         this.name = name;
     }

app/src/main/java/org/isoron/uhabits/models/sqlite/records/package-info.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Provides classes that represent rows in the SQLite database.
+ */
+package org.isoron.uhabits.models.sqlite.records;

app/src/main/java/org/isoron/uhabits/tasks/ProgressBar.java

@@ -19,8 +19,18 @@
 
 package org.isoron.uhabits.tasks;
 
+/**
+ * Simple progress bar, used to indicate the progress of a task.
+ */
 public interface ProgressBar
 {
+    /**
+     * Shows the progress bar.
+     */
     void show();
+
+    /**
+     * Hides the progress bar.
+     */
     void hide();
 }

app/src/main/java/org/isoron/uhabits/ui/AndroidProgressBar.java

@@ -19,29 +19,32 @@
 
 package org.isoron.uhabits.ui;
 
-import android.view.View;
+import android.view.*;
 
-import org.isoron.uhabits.tasks.ProgressBar;
+import org.isoron.uhabits.tasks.*;
 
-public class ProgressBarWrapper implements ProgressBar
+/**
+ * Android implementation of {@link ProgressBar}.
+ */
+public class AndroidProgressBar implements ProgressBar
 {
     private final android.widget.ProgressBar progressBar;
 
-    public ProgressBarWrapper(android.widget.ProgressBar progressBar)
+    public AndroidProgressBar(android.widget.ProgressBar progressBar)
     {
         this.progressBar = progressBar;
     }
 
+    @Override
+    public void hide()
+    {
+        progressBar.setVisibility(View.GONE);
+    }
+
     @Override
     public void show()
     {
         progressBar.setIndeterminate(true);
         progressBar.setVisibility(View.VISIBLE);
     }
-
-    @Override
-    public void hide()
-    {
-        progressBar.setVisibility(View.GONE);
-    }
 }

app/src/main/java/org/isoron/uhabits/ui/BaseActivity.java

@@ -19,17 +19,25 @@
 
 package org.isoron.uhabits.ui;
 
-import android.content.Intent;
+import android.content.*;
-import android.os.Bundle;
+import android.os.*;
-import android.support.annotation.Nullable;
+import android.support.annotation.*;
-import android.support.v7.app.AppCompatActivity;
+import android.support.v7.app.*;
-import android.view.Menu;
+import android.view.*;
-import android.view.MenuItem;
 
-import org.isoron.uhabits.utils.InterfaceUtils;
+import org.isoron.uhabits.utils.*;
 
 /**
  * Base class for all activities in the application.
+ * <p>
+ * This class delegates the responsibilities of an Android activity to other
+ * classes. For example, callbacks related to menus are forwarded to a {@link
+ * BaseMenu}, while callbacks related to activity results are forwarded to a
+ * {@link BaseScreen}.
+ * <p>
+ * A BaseActivity also installs an {@link java.lang.Thread.UncaughtExceptionHandler}
+ * to the main thread that logs the exception to the disk before the application
+ * crashes.
  */
 abstract public class BaseActivity extends AppCompatActivity
     implements Thread.UncaughtExceptionHandler
@@ -48,7 +56,8 @@ abstract public class BaseActivity extends AppCompatActivity
     {
         if (menu == null) return false;
         if (baseMenu == null) return false;
-        return baseMenu.onCreate(getMenuInflater(), menu);
+        baseMenu.onCreate(getMenuInflater(), menu);
+        return true;
     }
 
     @Override
@@ -79,7 +88,8 @@ abstract public class BaseActivity extends AppCompatActivity
         {
             ex.printStackTrace();
             new BaseSystem(this).dumpBugReportToFile();
-        } catch (Exception e)
+        }
+        catch (Exception e)
         {
             // ignored
         }

app/src/main/java/org/isoron/uhabits/ui/BaseMenu.java

@@ -19,11 +19,18 @@
 
 package org.isoron.uhabits.ui;
 
-import android.support.annotation.NonNull;
+import android.support.annotation.*;
-import android.view.Menu;
+import android.view.*;
-import android.view.MenuInflater;
-import android.view.MenuItem;
 
+import javax.annotation.*;
+
+/**
+ * Base class for all the menus in the application.
+ * <p>
+ * This class receives from BaseActivity all callbacks related to menus, such as
+ * menu creation and click events. It also handles some implementation details
+ * of creating menus in Android, such as inflating the resources.
+ */
 public abstract class BaseMenu
 {
     private final BaseActivity activity;
@@ -33,28 +40,59 @@ public abstract class BaseMenu
         this.activity = activity;
     }
 
-    public final boolean onCreate(@NonNull MenuInflater inflater,
+    /**
-                                  @NonNull Menu menu)
+     * Declare that the menu has changed, and should be recreated.
+     */
+    public void invalidate()
     {
-        menu.clear();
+        activity.invalidateOptionsMenu();
-        inflater.inflate(getMenuResourceId(), menu);
-        onCreate(menu);
-        return true;
     }
 
+    /**
+     * Called when the menu is first displayed.
+     * <p>
+     * The given menu is already inflated and ready to receive items. The
+     * application should override this method and add items to the menu here.
+     *
+     * @param menu the menu that is being created.
+     */
     public void onCreate(@NonNull Menu menu)
     {
     }
 
+    /**
+     * Called when the menu is first displayed.
+     * <p>
+     * This method cannot be overridden. The application should override the
+     * methods onCreate(Menu) and getMenuResourceId instead.
+     *
+     * @param inflater a menu inflater, for creating the menu
+     * @param menu     the menu that is being created.
+     */
+    public final void onCreate(@NonNull MenuInflater inflater,
+                               @NonNull Menu menu)
+    {
+        menu.clear();
+        inflater.inflate(getMenuResourceId(), menu);
+        onCreate(menu);
+    }
+
+    /**
+     * Called whenever an item on the menu is selected.
+     *
+     * @param item the item that was selected.
+     * @return true if the event was consumed, or false otherwise
+     */
     public boolean onItemSelected(@NonNull MenuItem item)
     {
         return true;
     }
 
+    /**
+     * Returns the id of the resource that should be used to inflate this menu.
+     *
+     * @return id of the menu resource.
+     */
+    @Resource
     protected abstract int getMenuResourceId();
-
-    public void invalidate()
-    {
-        activity.invalidateOptionsMenu();
-    }
 }

app/src/main/java/org/isoron/uhabits/ui/BaseScreen.java

@@ -19,26 +19,30 @@
 
 package org.isoron.uhabits.ui;
 
-import android.content.Intent;
+import android.content.*;
-import android.graphics.Color;
+import android.graphics.*;
-import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.*;
-import android.net.Uri;
+import android.net.*;
-import android.os.Build;
+import android.os.*;
-import android.support.annotation.NonNull;
+import android.support.annotation.*;
-import android.support.annotation.Nullable;
+import android.support.v7.app.*;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.AppCompatDialogFragment;
 import android.support.v7.view.ActionMode;
 import android.support.v7.widget.Toolbar;
-import android.view.Menu;
+import android.view.*;
-import android.view.MenuItem;
+import android.widget.*;
-import android.widget.Toast;
 
 import org.isoron.uhabits.tasks.ProgressBar;
-import org.isoron.uhabits.utils.ColorUtils;
+import org.isoron.uhabits.utils.*;
 
-import java.io.File;
+import java.io.*;
 
+/**
+ * Base class for all screens in the application.
+ * <p>
+ * Screens are responsible for deciding what root views and what menus should be
+ * attached to the main window. They are also responsible for showing other
+ * screens and for receiving their results.
+ */
 public abstract class BaseScreen
 {
     protected BaseActivity activity;
@@ -56,34 +60,72 @@ public abstract class BaseScreen
         this.activity = activity;
     }
 
+    /**
+     * Ends the current selection operation.
+     */
     public void finishSelection()
     {
         if (selectionMenu == null) return;
         selectionMenu.finish();
     }
 
+    /**
+     * Returns the progress bar that is currently visible on the screen.
+     * <p>
+     * If the root view attached to the screen does not provide any progress
+     * bars, returns null.
+     *
+     * @return current progress bar, or null if there are none.
+     */
     @Nullable
     public ProgressBar getProgressBar()
     {
         if (rootView == null) return null;
-        return new ProgressBarWrapper(rootView.getProgressBar());
+        return new AndroidProgressBar(rootView.getProgressBar());
     }
 
+    /**
+     * Notifies the screen that its contents should be updated.
+     */
     public void invalidate()
     {
         if (rootView == null) return;
         rootView.invalidate();
     }
 
+    /**
+     * Called when another Activity has finished, and has returned some result.
+     *
+     * @param requestCode the request code originally supplied to {@link
+     *                    android.app.Activity#startActivityForResult(Intent,
+     *                    int, Bundle)}.
+     * @param resultCode  the result code sent by the other activity.
+     * @param data        an Intent containing extra data sent by the other
+     *                    activity.
+     * @see {@link android.app.Activity#onActivityResult(int, int, Intent)}
+     */
     public void onResult(int requestCode, int resultCode, Intent data)
     {
     }
 
+    /**
+     * Sets the menu to be shown by this screen.
+     * <p>
+     * This menu will be visible if when there is no active selection operation.
+     * If the provided menu is null, then no menu will be shown.
+     *
+     * @param menu the menu to be shown.
+     */
     public void setMenu(@Nullable BaseMenu menu)
     {
         activity.setBaseMenu(menu);
     }
 
+    /**
+     * Sets the root view for this screen.
+     *
+     * @param rootView the root view for this screen.
+     */
     public void setRootView(@Nullable BaseRootView rootView)
     {
         this.rootView = rootView;
@@ -94,7 +136,7 @@ public abstract class BaseScreen
     }
 
     /**
-     * Set the menu to be shown when a selection is active on the screen.
+     * Sets the menu to be shown when a selection is active on the screen.
      *
      * @param menu the menu to be shown during a selection
      */
@@ -103,6 +145,11 @@ public abstract class BaseScreen
         this.selectionMenu = menu;
     }
 
+    /**
+     * Shows a message on the screen.
+     *
+     * @param stringId the string resource id for this message.
+     */
     public void showMessage(@Nullable Integer stringId)
     {
         if (stringId == null) return;
@@ -134,14 +181,21 @@ public abstract class BaseScreen
     }
 
     /**
-     * Instructs the screen to start a selection. If a selection menu was
+     * Instructs the screen to start a selection.
-     * provided, this menu will be shown instead of the regular one.
+     * <p>
+     * If a selection menu was provided, this menu will be shown instead of the
+     * regular one.
      */
     public void startSelection()
     {
         activity.startSupportActionMode(new ActionModeWrapper());
     }
 
+    protected void showDialog(AppCompatDialogFragment dialog, String tag)
+    {
+        dialog.show(activity.getSupportFragmentManager(), tag);
+    }
+
     private void initToolbar()
     {
         if (rootView == null) return;
@@ -174,11 +228,6 @@ public abstract class BaseScreen
         }
     }
 
-    protected void showDialog(AppCompatDialogFragment dialog, String tag)
-    {
-        dialog.show(activity.getSupportFragmentManager(), tag);
-    }
-
     private class ActionModeWrapper implements ActionMode.Callback
     {
         @Override
@@ -203,7 +252,7 @@ public abstract class BaseScreen
         public void onDestroyActionMode(@Nullable ActionMode mode)
         {
             if (selectionMenu == null) return;
-            selectionMenu.onDestroy();
+            selectionMenu.onFinish();
         }
 
         @Override

app/src/main/java/org/isoron/uhabits/ui/BaseSelectionMenu.java

@@ -19,13 +19,22 @@
 
 package org.isoron.uhabits.ui;
 
-import android.support.annotation.NonNull;
+import android.support.annotation.*;
-import android.support.annotation.Nullable;
 import android.support.v7.view.ActionMode;
-import android.view.Menu;
+import android.view.*;
-import android.view.MenuInflater;
-import android.view.MenuItem;
 
+/**
+ * Base class for all the selection menus in the application.
+ * <p>
+ * A selection menu is a menu that appears when the screen starts a selection
+ * operation. It contains actions that modify the selected items, such as delete
+ * or archive. Since it replaces the toolbar, it also has a title.
+ * <p>
+ * This class hides many implementation details of creating such menus in
+ * Android. The interface is supposed to look very similar to {@link BaseMenu},
+ * with a few additional methods, such as finishing the selection operation.
+ * Internally, it uses an {@link ActionMode}.
+ */
 public abstract class BaseSelectionMenu
 {
     @Nullable
@@ -39,35 +48,69 @@ public abstract class BaseSelectionMenu
         if (actionMode != null) actionMode.finish();
     }
 
+    /**
+     * Declare that the menu has changed, and should be recreated.
+     */
     public void invalidate()
     {
         if (actionMode != null) actionMode.invalidate();
     }
 
-    public final void onCreate(@NonNull MenuInflater menuInflater,
+    /**
+     * Called when the menu is first displayed.
+     * <p>
+     * This method cannot be overridden. The application should override the
+     * methods onCreate(Menu) and getMenuResourceId instead.
+     *
+     * @param inflater a menu inflater, for creating the menu
+     * @param mode     the action mode associated with this menu.
+     * @param menu     the menu that is being created.
+     */
+    public final void onCreate(@NonNull MenuInflater inflater,
                                @NonNull ActionMode mode,
                                @NonNull Menu menu)
     {
         this.actionMode = mode;
-        menuInflater.inflate(getResourceId(), menu);
+        inflater.inflate(getResourceId(), menu);
         onCreate(menu);
     }
 
-    public void onDestroy()
+    /**
+     * Called when the selection operation is about to finish.
+     */
+    public void onFinish()
     {
 
     }
 
+    /**
+     * Called whenever an item on the menu is selected.
+     *
+     * @param item the item that was selected.
+     * @return true if the event was consumed, or false otherwise
+     */
     public boolean onItemClicked(@NonNull MenuItem item)
     {
         return false;
     }
 
+
+    /**
+     * Called whenever the menu is invalidated.
+     *
+     * @param menu the menu to be refreshed
+     * @return true if the menu has changes, false otherwise
+     */
     public boolean onPrepare(@NonNull Menu menu)
     {
         return false;
     }
 
+    /**
+     * Sets the title of the selection menu.
+     *
+     * @param title the new title.
+     */
     public void setTitle(String title)
     {
         if (actionMode != null) actionMode.setTitle(title);
@@ -76,10 +119,9 @@ public abstract class BaseSelectionMenu
     protected abstract int getResourceId();
 
     /**
-     * Called when the menu is first created, right after the menu has been
+     * Called when the menu is first created.
-     * inflated.
      *
-     * @param menu the menu containing the buttons
+     * @param menu the menu being created
      */
     protected void onCreate(@NonNull Menu menu)
     {

app/src/main/java/org/isoron/uhabits/ui/BaseSystem.java

@@ -19,29 +19,31 @@
 
 package org.isoron.uhabits.ui;
 
-import android.content.Context;
+import android.content.*;
-import android.os.Environment;
+import android.os.*;
-import android.support.annotation.NonNull;
+import android.support.annotation.*;
-import android.view.WindowManager;
+import android.view.*;
 
-import org.isoron.uhabits.BuildConfig;
+import org.isoron.uhabits.*;
-import org.isoron.uhabits.HabitsApplication;
+import org.isoron.uhabits.models.*;
-import org.isoron.uhabits.models.HabitList;
+import org.isoron.uhabits.tasks.*;
-import org.isoron.uhabits.tasks.BaseTask;
+import org.isoron.uhabits.utils.*;
-import org.isoron.uhabits.utils.DateUtils;
+import org.isoron.uhabits.widgets.*;
-import org.isoron.uhabits.utils.FileUtils;
-import org.isoron.uhabits.utils.ReminderUtils;
-import org.isoron.uhabits.widgets.WidgetManager;
 
-import java.io.BufferedReader;
+import java.io.*;
-import java.io.File;
+import java.lang.Process;
-import java.io.FileWriter;
+import java.util.*;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.util.LinkedList;
 
-import javax.inject.Inject;
+import javax.inject.*;
 
+/**
+ * Base class for all systems class in the application.
+ * <p>
+ * Classes derived from BaseSystem are responsible for handling events and
+ * sending requests to the Android operating system. Examples include capturing
+ * a bug report, obtaining device information, or requesting runtime
+ * permissions.
+ */
 public class BaseSystem
 {
     private Context context;
@@ -55,69 +57,16 @@ public class BaseSystem
         HabitsApplication.getComponent().inject(this);
     }
 
-    public String getLogcat() throws IOException
+    /**
-    {
+     * Captures a bug report and saves it to a file in the SD card.
-        int maxNLines = 250;
+     * <p>
-        StringBuilder builder = new StringBuilder();
+     * The contents of the file are generated by the method {@link
-
+     * #getBugReport()}. The file is saved in the apps's external private
-        String[] command = new String[]{"logcat", "-d"};
+     * storage.
-        Process process = Runtime.getRuntime().exec(command);
+     *
-
+     * @return the generated file.
-        InputStreamReader in = new InputStreamReader(process.getInputStream());
+     * @throws IOException when I/O errors occur.
-        BufferedReader bufferedReader = new BufferedReader(in);
+     */
-
-        LinkedList<String> log = new LinkedList<>();
-
-        String line;
-        while ((line = bufferedReader.readLine()) != null)
-        {
-            log.addLast(line);
-            if (log.size() > maxNLines) log.removeFirst();
-        }
-
-        for (String l : log)
-        {
-            builder.append(l);
-            builder.append('\n');
-        }
-
-        return builder.toString();
-    }
-
-    public String getDeviceInfo()
-    {
-        if (context == null) return "";
-
-        StringBuilder b = new StringBuilder();
-        WindowManager wm =
-            (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
-
-        b.append(
-            String.format("App Version Name: %s\n", BuildConfig.VERSION_NAME));
-        b.append(
-            String.format("App Version Code: %s\n", BuildConfig.VERSION_CODE));
-        b.append(String.format("OS Version: %s (%s)\n",
-            java.lang.System.getProperty("os.version"),
-            android.os.Build.VERSION.INCREMENTAL));
-        b.append(
-            String.format("OS API Level: %s\n", android.os.Build.VERSION.SDK));
-        b.append(String.format("Device: %s\n", android.os.Build.DEVICE));
-        b.append(
-            String.format("Model (Product): %s (%s)\n", android.os.Build.MODEL,
-                android.os.Build.PRODUCT));
-        b.append(
-            String.format("Manufacturer: %s\n", android.os.Build.MANUFACTURER));
-        b.append(String.format("Other tags: %s\n", android.os.Build.TAGS));
-        b.append(String.format("Screen Width: %s\n",
-            wm.getDefaultDisplay().getWidth()));
-        b.append(String.format("Screen Height: %s\n",
-            wm.getDefaultDisplay().getHeight()));
-        b.append(String.format("SD Card state: %s\n\n",
-            Environment.getExternalStorageState()));
-
-        return b.toString();
-    }
-
     @NonNull
     public File dumpBugReportToFile() throws IOException
     {
@@ -138,6 +87,14 @@ public class BaseSystem
         return logFile;
     }
 
+    /**
+     * Captures and returns a bug report.
+     * <p>
+     * The bug report contains some device information and the logcat.
+     *
+     * @return a String containing the bug report.
+     * @throws IOException when any I/O error occur.
+     */
     @NonNull
     public String getBugReport() throws IOException
     {
@@ -146,6 +103,9 @@ public class BaseSystem
         return deviceInfo + "\n" + logcat;
     }
 
+    /**
+     * Recreates all application reminders.
+     */
     public void scheduleReminders()
     {
         new BaseTask()
@@ -159,6 +119,9 @@ public class BaseSystem
         }.execute();
     }
 
+    /**
+     * Refreshes all application widgets.
+     */
     public void updateWidgets()
     {
         new BaseTask()
@@ -171,4 +134,59 @@ public class BaseSystem
             }
         }.execute();
     }
+
+    private String getDeviceInfo()
+    {
+        if (context == null) return "null context\n";
+
+        WindowManager wm =
+            (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
+
+        return
+            String.format("App Version Name: %s\n", BuildConfig.VERSION_NAME) +
+            String.format("App Version Code: %s\n", BuildConfig.VERSION_CODE) +
+            String.format("OS Version: %s (%s)\n",
+                 System.getProperty("os.version"), Build.VERSION.INCREMENTAL) +
+            String.format("OS API Level: %s\n", Build.VERSION.SDK) +
+            String.format("Device: %s\n", Build.DEVICE) +
+            String.format("Model (Product): %s (%s)\n", Build.MODEL,
+                Build.PRODUCT) +
+            String.format("Manufacturer: %s\n", Build.MANUFACTURER) +
+            String.format("Other tags: %s\n", Build.TAGS) +
+            String.format("Screen Width: %s\n",
+                wm.getDefaultDisplay().getWidth()) +
+            String.format("Screen Height: %s\n",
+                wm.getDefaultDisplay().getHeight()) +
+            String.format("External storage state: %s\n\n",
+                Environment.getExternalStorageState());
+    }
+
+    private String getLogcat() throws IOException
+    {
+        int maxLineCount = 250;
+        StringBuilder builder = new StringBuilder();
+
+        String[] command = new String[]{"logcat", "-d"};
+        Process process = Runtime.getRuntime().exec(command);
+
+        InputStreamReader in = new InputStreamReader(process.getInputStream());
+        BufferedReader bufferedReader = new BufferedReader(in);
+
+        LinkedList<String> log = new LinkedList<>();
+
+        String line;
+        while ((line = bufferedReader.readLine()) != null)
+        {
+            log.addLast(line);
+            if (log.size() > maxLineCount) log.removeFirst();
+        }
+
+        for (String l : log)
+        {
+            builder.append(l);
+            builder.append('\n');
+        }
+
+        return builder.toString();
+    }
 }

app/src/main/java/org/isoron/uhabits/ui/habits/list/ListHabitsSelectionMenu.java

@@ -59,10 +59,10 @@ public class ListHabitsSelectionMenu extends BaseSelectionMenu
     }
 
     @Override
-    public void onDestroy()
+    public void onFinish()
     {
         if (adapter != null) adapter.clearSelection();
-        super.onDestroy();
+        super.onFinish();
     }
 
     @Override