Add line graph to statistics screen

10 files changed, 455 insertions, 12 deletions

diff --git a/app/src/main/java/de/danoeh/antennapod/adapter/YearStatisticsListAdapter.java b/app/src/main/java/de/danoeh/antennapod/adapter/YearStatisticsListAdapter.java
new file mode 100644
index 000000000..ad20574b3
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/adapter/YearStatisticsListAdapter.java
@@ -0,0 +1,121 @@
+package de.danoeh.antennapod.adapter;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+import de.danoeh.antennapod.R;
+import de.danoeh.antennapod.core.storage.DBReader;
+import de.danoeh.antennapod.core.util.LongList;
+import de.danoeh.antennapod.view.LineChartView;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * Adapter for the yearly playback statistics list.
+ */
+public class YearStatisticsListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+    private static final int TYPE_HEADER = 0;
+    private static final int TYPE_FEED = 1;
+    final Context context;
+    private List<DBReader.MonthlyStatisticsItem> statisticsData = new ArrayList<>();
+    LineChartView.LineChartData lineChartData;
+
+    public YearStatisticsListAdapter(Context context) {
+        this.context = context;
+    }
+
+    @Override
+    public int getItemCount() {
+        return statisticsData.size() + 1;
+    }
+
+    @Override
+    public int getItemViewType(int position) {
+        return position == 0 ? TYPE_HEADER : TYPE_FEED;
+    }
+
+    @NonNull
+    @Override
+    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        LayoutInflater inflater = LayoutInflater.from(context);
+        if (viewType == TYPE_HEADER) {
+            return new HeaderHolder(inflater.inflate(R.layout.statistics_listitem_linechart, parent, false));
+        }
+        return new StatisticsHolder(inflater.inflate(R.layout.statistics_year_listitem, parent, false));
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder h, int position) {
+        if (getItemViewType(position) == TYPE_HEADER) {
+            HeaderHolder holder = (HeaderHolder) h;
+            holder.lineChart.setData(lineChartData);
+        } else {
+            StatisticsHolder holder = (StatisticsHolder) h;
+            DBReader.MonthlyStatisticsItem statsItem = statisticsData.get(position - 1);
+            holder.year.setText(String.format(Locale.getDefault(), "%d ", statsItem.year));
+            holder.hours.setText(String.format(Locale.getDefault(), "%.1f ", statsItem.timePlayed / 3600000.0f)
+                    + context.getString(R.string.time_hours));
+        }
+    }
+
+    public void update(List<DBReader.MonthlyStatisticsItem> statistics) {
+        int lastYear = statistics.size() > 0 ? statistics.get(0).year : 0;
+        int lastDataPoint = statistics.size() > 0 ? (statistics.get(0).month - 1) + lastYear * 12 : 0;
+        long yearSum = 0;
+        statisticsData.clear();
+        LongList lineChartValues = new LongList();
+        LongList lineChartHorizontalLines = new LongList();
+        for (DBReader.MonthlyStatisticsItem statistic : statistics) {
+            if (statistic.year != lastYear) {
+                DBReader.MonthlyStatisticsItem yearAggregate = new DBReader.MonthlyStatisticsItem();
+                yearAggregate.year = lastYear;
+                yearAggregate.timePlayed = yearSum;
+                statisticsData.add(yearAggregate);
+                yearSum = 0;
+                lastYear = statistic.year;
+                lineChartHorizontalLines.add(lineChartValues.size());
+            }
+            yearSum += statistic.timePlayed;
+            while (lastDataPoint + 1 < (statistic.month - 1) + statistic.year * 12) {
+                lineChartValues.add(0); // Compensate for months without playback
+                lastDataPoint++;
+            }
+            lineChartValues.add(statistic.timePlayed);
+            lastDataPoint = (statistic.month - 1) + statistic.year * 12;
+        }
+        DBReader.MonthlyStatisticsItem yearAggregate = new DBReader.MonthlyStatisticsItem();
+        yearAggregate.year = lastYear;
+        yearAggregate.timePlayed = yearSum;
+        statisticsData.add(yearAggregate);
+        Collections.reverse(statisticsData);
+        lineChartData = new LineChartView.LineChartData(lineChartValues.toArray(), lineChartHorizontalLines.toArray());
+        notifyDataSetChanged();
+    }
+
+    static class HeaderHolder extends RecyclerView.ViewHolder {
+        LineChartView lineChart;
+
+        HeaderHolder(View itemView) {
+            super(itemView);
+            lineChart = itemView.findViewById(R.id.lineChart);
+        }
+    }
+
+    static class StatisticsHolder extends RecyclerView.ViewHolder {
+        TextView year;
+        TextView hours;
+
+        StatisticsHolder(View itemView) {
+            super(itemView);
+            year = itemView.findViewById(R.id.yearLabel);
+            hours = itemView.findViewById(R.id.hoursLabel);
+        }
+    }
+}
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java
index 5a280ac81..1c5a6acd4 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java
@@ -25,9 +25,10 @@ public class StatisticsFragment extends PagedToolbarFragment {
 
     public static final String TAG = "StatisticsFragment";
 
-    private static final int POS_LISTENED_HOURS = 0;
-    private static final int POS_SPACE_TAKEN = 1;
-    private static final int TOTAL_COUNT = 2;
+    private static final int POS_SUBSCRIPTIONS = 0;
+    private static final int POS_YEARS = 1;
+    private static final int POS_SPACE_TAKEN = 2;
+    private static final int TOTAL_COUNT = 3;
 
     private TabLayout tabLayout;
     private ViewPager2 viewPager;
@@ -51,11 +52,14 @@ public class StatisticsFragment extends PagedToolbarFragment {
         super.setupPagedToolbar(toolbar, viewPager);
         new TabLayoutMediator(tabLayout, viewPager, (tab, position) -> {
             switch (position) {
-                case POS_LISTENED_HOURS:
-                    tab.setText(R.string.playback_statistics_label);
+                case POS_SUBSCRIPTIONS:
+                    tab.setText(R.string.subscriptions_label);
+                    break;
+                case POS_YEARS:
+                    tab.setText(R.string.years_statistics_label);
                     break;
                 case POS_SPACE_TAKEN:
-                    tab.setText(R.string.download_statistics_label);
+                    tab.setText(R.string.downloads_label);
                     break;
                 default:
                     break;
@@ -82,8 +86,10 @@ public class StatisticsFragment extends PagedToolbarFragment {
         @Override
         public Fragment createFragment(int position) {
             switch (position) {
-                case POS_LISTENED_HOURS:
-                    return new PlaybackStatisticsFragment();
+                case POS_SUBSCRIPTIONS:
+                    return new SubscriptionStatisticsFragment();
+                case POS_YEARS:
+                    return new YearsStatisticsFragment();
                 default:
                 case POS_SPACE_TAKEN:
                     return new DownloadStatisticsFragment();
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/preferences/PlaybackStatisticsFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/SubscriptionStatisticsFragment.java
index 31c96a2ff..ef701d35c 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/preferences/PlaybackStatisticsFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/SubscriptionStatisticsFragment.java
@@ -43,8 +43,8 @@ import java.util.Locale;
 /**
  * Displays the 'playback statistics' screen
  */
-public class PlaybackStatisticsFragment extends Fragment {
-    private static final String TAG = PlaybackStatisticsFragment.class.getSimpleName();
+public class SubscriptionStatisticsFragment extends Fragment {
+    private static final String TAG = SubscriptionStatisticsFragment.class.getSimpleName();
     private static final String PREF_NAME = "StatisticsActivityPrefs";
     private static final String PREF_INCLUDE_MARKED_PLAYED = "countAll";
     private static final String PREF_FILTER_FROM = "filterFrom";
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/preferences/YearsStatisticsFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/YearsStatisticsFragment.java
new file mode 100644
index 000000000..c58a59801
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/YearsStatisticsFragment.java
@@ -0,0 +1,87 @@
+package de.danoeh.antennapod.fragment.preferences;
+
+import android.os.Bundle;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ProgressBar;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import de.danoeh.antennapod.R;
+import de.danoeh.antennapod.adapter.YearStatisticsListAdapter;
+import de.danoeh.antennapod.core.storage.DBReader;
+import io.reactivex.Observable;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.Disposable;
+import io.reactivex.schedulers.Schedulers;
+
+/**
+ * Displays the yearly statistics screen
+ */
+public class YearsStatisticsFragment extends Fragment {
+    private static final String TAG = YearsStatisticsFragment.class.getSimpleName();
+
+    private Disposable disposable;
+    private RecyclerView yearStatisticsList;
+    private ProgressBar progressBar;
+    private YearStatisticsListAdapter listAdapter;
+
+    @Nullable
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
+                             @Nullable Bundle savedInstanceState) {
+        View root = inflater.inflate(R.layout.statistics_activity, container, false);
+        yearStatisticsList = root.findViewById(R.id.statistics_list);
+        progressBar = root.findViewById(R.id.progressBar);
+        listAdapter = new YearStatisticsListAdapter(getContext());
+        yearStatisticsList.setLayoutManager(new LinearLayoutManager(getContext()));
+        yearStatisticsList.setAdapter(listAdapter);
+        return root;
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        refreshStatistics();
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        if (disposable != null) {
+            disposable.dispose();
+        }
+    }
+
+    @Override
+    public void onPrepareOptionsMenu(@NonNull Menu menu) {
+        super.onPrepareOptionsMenu(menu);
+        menu.findItem(R.id.statistics_reset).setVisible(false);
+        menu.findItem(R.id.statistics_filter).setVisible(false);
+    }
+
+    private void refreshStatistics() {
+        progressBar.setVisibility(View.VISIBLE);
+        yearStatisticsList.setVisibility(View.GONE);
+        loadStatistics();
+    }
+
+    private void loadStatistics() {
+        if (disposable != null) {
+            disposable.dispose();
+        }
+        disposable = Observable.fromCallable(DBReader::getMonthlyTimeStatistics)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(result -> {
+                    listAdapter.update(result);
+                    progressBar.setVisibility(View.GONE);
+                    yearStatisticsList.setVisibility(View.VISIBLE);
+                }, error -> Log.e(TAG, Log.getStackTraceString(error)));
+    }
+}
diff --git a/app/src/main/java/de/danoeh/antennapod/view/LineChartView.java b/app/src/main/java/de/danoeh/antennapod/view/LineChartView.java
new file mode 100644
index 000000000..0eb225e8e
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/view/LineChartView.java
@@ -0,0 +1,138 @@
+package de.danoeh.antennapod.view;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.ColorFilter;
+import android.graphics.DashPathEffect;
+import android.graphics.LinearGradient;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.Shader;
+import android.graphics.drawable.Drawable;
+import android.util.AttributeSet;
+import androidx.annotation.NonNull;
+import androidx.appcompat.widget.AppCompatImageView;
+import androidx.appcompat.widget.ThemeUtils;
+import de.danoeh.antennapod.R;
+import io.reactivex.annotations.Nullable;
+
+public class LineChartView extends AppCompatImageView {
+    private LineChartDrawable drawable;
+
+    public LineChartView(Context context) {
+        super(context);
+        setup();
+    }
+
+    public LineChartView(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        setup();
+    }
+
+    public LineChartView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        setup();
+    }
+
+    @SuppressLint("ClickableViewAccessibility")
+    private void setup() {
+        drawable = new LineChartDrawable();
+        setImageDrawable(drawable);
+    }
+
+    /**
+     * Set of data values to display.
+     */
+    public void setData(LineChartData data) {
+        drawable.data = data;
+    }
+
+    public static class LineChartData {
+        private final long valueMax;
+        private final long[] values;
+        private final long[] verticalLines;
+
+        public LineChartData(long[] values, long[] verticalLines) {
+            this.values = values;
+            long valueMax = 0;
+            for (long datum : values) {
+                valueMax = Math.max(datum, valueMax);
+            }
+            this.valueMax = valueMax;
+            this.verticalLines = verticalLines;
+        }
+
+        public float getHeight(int item) {
+            return (float) values[item] / valueMax;
+        }
+    }
+
+    private class LineChartDrawable extends Drawable {
+        private LineChartData data;
+        private final Paint paintLine;
+        private final Paint paintBackground;
+        private final Paint paintVerticalLines;
+
+        private LineChartDrawable() {
+            paintLine = new Paint();
+            paintLine.setFlags(Paint.ANTI_ALIAS_FLAG);
+            paintLine.setStyle(Paint.Style.STROKE);
+            paintLine.setStrokeJoin(Paint.Join.ROUND);
+            paintLine.setStrokeCap(Paint.Cap.ROUND);
+            paintLine.setColor(ThemeUtils.getThemeAttrColor(getContext(), R.attr.colorAccent));
+            paintBackground = new Paint();
+            paintBackground.setStyle(Paint.Style.FILL);
+            paintVerticalLines = new Paint();
+            paintVerticalLines.setStyle(Paint.Style.STROKE);
+            paintVerticalLines.setPathEffect(new DashPathEffect(new float[] {10f, 10f}, 0f));
+            paintVerticalLines.setColor(0x66777777);
+        }
+
+        @Override
+        public void draw(@NonNull Canvas canvas) {
+            float width = getBounds().width();
+            float height = getBounds().height();
+            float usableHeight = height * 0.9f;
+            float stepSize = width / (data.values.length + 1);
+
+            paintVerticalLines.setStrokeWidth(height * 0.005f);
+            for (long line : data.verticalLines) {
+                canvas.drawLine((line + 1) * stepSize, 0, (line + 1) * stepSize, height, paintVerticalLines);
+            }
+
+            paintLine.setStrokeWidth(height * 0.015f);
+            Path path = new Path();
+            for (int i = 0; i < data.values.length; i++) {
+                if (i == 0) {
+                    path.moveTo((i + 1) * stepSize, (1 - data.getHeight(i)) * usableHeight + height * 0.05f);
+                } else {
+                    path.lineTo((i + 1) * stepSize, (1 - data.getHeight(i)) * usableHeight + height * 0.05f);
+                }
+            }
+            canvas.drawPath(path, paintLine);
+
+            path.lineTo(data.values.length * stepSize, height);
+            path.lineTo(stepSize, height);
+            paintBackground.setShader(new LinearGradient(0, 0, 0, height,
+                    (ThemeUtils.getThemeAttrColor(getContext(), R.attr.colorAccent) & 0xffffff) + 0x66000000,
+                    Color.TRANSPARENT, Shader.TileMode.CLAMP));
+            canvas.drawPath(path, paintBackground);
+        }
+
+        @Override
+        public int getOpacity() {
+            return PixelFormat.TRANSLUCENT;
+        }
+
+        @Override
+        public void setAlpha(int alpha) {
+        }
+
+        @Override
+        public void setColorFilter(ColorFilter cf) {
+        }
+    }
+}
diff --git a/app/src/main/res/layout/statistics_listitem_linechart.xml b/app/src/main/res/layout/statistics_listitem_linechart.xml
new file mode 100644
index 000000000..0794a1c09
--- /dev/null
+++ b/app/src/main/res/layout/statistics_listitem_linechart.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <de.danoeh.antennapod.view.LineChartView
+        android:id="@+id/lineChart"
+        android:layout_width="match_parent"
+        android:layout_height="200dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="8dp" />
+
+    <View
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:layout_marginTop="16dp"
+        android:background="?android:attr/dividerVertical" />
+
+</LinearLayout>
diff --git a/app/src/main/res/layout/statistics_year_listitem.xml b/app/src/main/res/layout/statistics_year_listitem.xml
new file mode 100644
index 000000000..48b910c7f
--- /dev/null
+++ b/app/src/main/res/layout/statistics_year_listitem.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:paddingLeft="16dp"
+    android:paddingRight="16dp"
+    android:paddingTop="16dp"
+    android:paddingBottom="8dp"
+    android:background="?android:attr/selectableItemBackground">
+
+    <TextView
+        android:id="@+id/yearLabel"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:lines="1"
+        android:textColor="?android:attr/textColorPrimary"
+        android:textSize="16sp"
+        tools:text="2020" />
+
+    <TextView
+        android:id="@+id/hoursLabel"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:lines="1"
+        android:textColor="?android:attr/textColorTertiary"
+        android:textSize="14sp"
+        tools:text="23 hours" />
+
+</LinearLayout>
diff --git a/core/src/main/java/de/danoeh/antennapod/core/storage/DBReader.java b/core/src/main/java/de/danoeh/antennapod/core/storage/DBReader.java
index 5ea3f1e14..11ff813a9 100644
--- a/core/src/main/java/de/danoeh/antennapod/core/storage/DBReader.java
+++ b/core/src/main/java/de/danoeh/antennapod/core/storage/DBReader.java
@@ -771,6 +771,33 @@ public final class DBReader {
         }
     }
 
+    public static class MonthlyStatisticsItem {
+        public int year = 0;
+        public int month = 0;
+        public long timePlayed = 0;
+    }
+
+    @NonNull
+    public static List<MonthlyStatisticsItem> getMonthlyTimeStatistics() {
+        List<MonthlyStatisticsItem> months = new ArrayList<>();
+        PodDBAdapter adapter = PodDBAdapter.getInstance();
+        adapter.open();
+        try (Cursor cursor = adapter.getMonthlyStatisticsCursor()) {
+            int indexMonth = cursor.getColumnIndexOrThrow("month");
+            int indexYear = cursor.getColumnIndexOrThrow("year");
+            int indexTotalDuration = cursor.getColumnIndexOrThrow("total_duration");
+            while (cursor.moveToNext()) {
+                MonthlyStatisticsItem item = new MonthlyStatisticsItem();
+                item.month = Integer.parseInt(cursor.getString(indexMonth));
+                item.year = Integer.parseInt(cursor.getString(indexYear));
+                item.timePlayed = cursor.getLong(indexTotalDuration);
+                months.add(item);
+            }
+        }
+        adapter.close();
+        return months;
+    }
+
     public static class StatisticsResult {
         public List<StatisticsItem> feedTime = new ArrayList<>();
         public long oldestDate = System.currentTimeMillis();
diff --git a/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java b/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java
index 43d9c7f11..ea4617f16 100644
--- a/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java
+++ b/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java
@@ -1133,6 +1133,17 @@ public class PodDBAdapter {
         return db.rawQuery(query, null);
     }
 
+    public final Cursor getMonthlyStatisticsCursor() {
+        final String query = "SELECT SUM(" + KEY_PLAYED_DURATION + ") AS total_duration"
+                + ", strftime('%m', datetime(" + KEY_LAST_PLAYED_TIME + "/1000, 'unixepoch')) AS month"
+                + ", strftime('%Y', datetime(" + KEY_LAST_PLAYED_TIME + "/1000, 'unixepoch')) AS year"
+                + " FROM " + TABLE_NAME_FEED_MEDIA
+                + " WHERE " + KEY_LAST_PLAYED_TIME + " > 0 AND " + KEY_PLAYED_DURATION + " > 0"
+                + " GROUP BY year, month"
+                + " ORDER BY year, month";
+        return db.rawQuery(query, null);
+    }
+
     public int getQueueSize() {
         final String query = String.format("SELECT COUNT(%s) FROM %s", KEY_ID, TABLE_NAME_QUEUE);
         Cursor c = db.rawQuery(query, null);
diff --git a/core/src/main/res/values/strings.xml b/core/src/main/res/values/strings.xml
index 67dd3b3e4..783065178 100644
--- a/core/src/main/res/values/strings.xml
+++ b/core/src/main/res/values/strings.xml
@@ -28,8 +28,7 @@
     <string name="gpodnet_main_label">gpodder.net</string>
     <string name="episode_cache_full_title">Episode cache full</string>
     <string name="episode_cache_full_message">The episode cache limit has been reached. You can increase the cache size in the Settings.</string>
-    <string name="playback_statistics_label">Playback</string>
-    <string name="download_statistics_label">Downloads</string>
+    <string name="years_statistics_label">Years</string>
     <string name="notification_pref_fragment">Notifications</string>
 
     <!-- Google Assistant -->