update

app/build.gradle

@@ -36,6 +36,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.4.1'
     implementation 'com.google.android.material:material:1.5.0'
     implementation 'androidx.core:core-ktx:1.10.1'
+    implementation 'androidx.preference:preference:1.2.0'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
@@ -13,18 +14,27 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.EasterScrSaver"
         tools:targetApi="32">
+        <activity
+            android:name=".SettingsActivity"
+            android:exported="false"
+            android:label="@string/title_activity_settings" />
 
-    <service
+        <service
-        android:name=".EasterDream"
+            android:name=".EasterDream"
-        android:exported="true"
+            android:exported="true"
-        android:icon="@mipmap/ic_launcher"
+            android:icon="@mipmap/ic_launcher"
-        android:label="@string/app_name"
+            android:label="@string/app_name"
-        android:permission="android.permission.BIND_DREAM_SERVICE">
+            android:permission="android.permission.BIND_DREAM_SERVICE">
+            <intent-filter>
+                <action android:name="android.service.dreams.DreamService" />
 
-        <intent-filter>
+                <category android:name="android.intent.category.DEFAULT" />
-            <action android:name="android.service.dreams.DreamService" />
+            </intent-filter>
-            <category android:name="android.intent.category.DEFAULT" />
+
-        </intent-filter>
+            <meta-data
-    </service>
+                android:name="android.service.dream"
+                android:resource="@xml/easterdream" />
+        </service>
     </application>
+
 </manifest>

app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java

@@ -4,12 +4,13 @@ import static android.graphics.PixelFormat.TRANSLUCENT;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
+import android.annotation.SuppressLint;
 import android.app.WallpaperManager;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
-import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.LayerDrawable;
@@ -27,12 +28,17 @@ import android.widget.ImageView;
 
 import androidx.annotation.ChecksSdkIntAtLeast;
 import androidx.core.app.ActivityCompat;
+import androidx.preference.PreferenceManager;
 
+import java.util.ArrayList;
+import java.util.Random;
 import java.util.Timer;
 import java.util.TimerTask;
 
 public class EasterDream extends DreamService {
-    private static String TAG = "easter_daydream";
+    private static String TAG = "EasterDream";
+    private SharedPreferences prefs;
+
     private Drawable wallPaperDrawable = null;
     private FrameLayout last = null;
     private boolean enabled = false;
@@ -101,7 +107,9 @@ public class EasterDream extends DreamService {
     @Override
     public void onAttachedToWindow() {
         super.onAttachedToWindow();
+        this.prefs = PreferenceManager.getDefaultSharedPreferences(this);
 
+        setScreenBright(!this.prefs.getBoolean("dim_screen", false));
         // Exit dream upon user touch
         setInteractive(false);
         // Hide system UI
@@ -119,7 +127,7 @@ public class EasterDream extends DreamService {
         refresh();
     }
 
-    private static final String[][] EMOJI_SETS = {
+    protected static final String[][] EMOJI_SETS = {
             {"🍇", "🍈", "🍉", "🍊", "🍋", "🍌", "🍍", "🥭", "🍎", "🍏", "🍐", "🍑",
                     "🍒", "🍓", "🫐", "🥝"},
             {"😺", "😸", "😹", "😻", "😼", "😽", "🙀", "😿", "😾"},
@@ -245,20 +253,37 @@ class BubblesDrawable extends Drawable {
                 //randomize();
                 //chooseEmojiSet();
             }
-        }, 10000L);
+        }, Integer.parseInt(EasterDream.this.prefs.getString("switch_time", "10")) * 1000L);
     }
 
     public void chooseEmojiSet() {
-        if (Math.random() < 0.8) {
+        ArrayList<Integer> probList = new ArrayList<>();
-            if (Math.random() < 0.4) {
+        int probSum = 0;
-                mEmojiSet = 0;
+        for (int i = 0; i < EMOJI_SETS.length; i++) {
-            }
+            @SuppressLint("DefaultLocale")
-            else {
+            int p = Integer.parseInt(EasterDream.this.prefs.getString(String.format("prob_%d", i), "5"));
-                mEmojiSet = 13;
+            probSum += p;
-            }
+            probList.add(probSum);
+            //Log.d(TAG, String.format("probList %d %d", i, probSum));
+        }
+        //Log.d(TAG, String.format("probSum %d", probSum));
+        if (probSum <= 0) {
+            mEmojiSet = (int) (Math.random() * EMOJI_SETS.length);
         }
         else {
-            mEmojiSet = (int) (Math.random() * EMOJI_SETS.length);
+            mEmojiSet = -1;
+            int r = (new Random()).nextInt(probSum);
+            for (int i = 0; i < EMOJI_SETS.length; i++) {
+                if (r < probList.get(i)) {
+                    mEmojiSet = i;
+                    break;
+                }
+            }
+            //Log.d(TAG, String.format("probRand %d", r));
+            if (mEmojiSet < 0) {
+                Log.e(TAG, String.format("unexpected mEmojiSet %d", mEmojiSet));
+                mEmojiSet = (int) (Math.random() * EMOJI_SETS.length);
+            }
         }
         final String[] emojiSet = EMOJI_SETS[mEmojiSet];
         Log.i(TAG, "chooseEmojiSet: " + mEmojiSet);

app/src/main/java/cc/jerryxiao/easterscrsaver/SettingsActivity.java

@@ -0,0 +1,102 @@
+package cc.jerryxiao.easterscrsaver;
+
+import android.annotation.SuppressLint;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.util.Log;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.preference.ListPreference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceFragmentCompat;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+public class SettingsActivity extends AppCompatActivity {
+    private static String TAG = "EasterDream";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.settings_activity);
+        if (savedInstanceState == null) {
+            getSupportFragmentManager()
+                    .beginTransaction()
+                    .replace(R.id.settings, new SettingsFragment())
+                    .commit();
+        }
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar != null) {
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
+
+        Map<String, String> permissionsToRequest = new HashMap<>();
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            permissionsToRequest.putAll(Map.of("android.permission.READ_EXTERNAL_STORAGE",
+                    getString(R.string.permission_denied_read_external_storage)));
+            Iterator<Map.Entry<String, String>> it = permissionsToRequest.entrySet().iterator();
+            if (it.hasNext()) {
+                if (checkSelfPermission(it.next().getKey()) == PackageManager.PERMISSION_GRANTED) {
+                    it.remove();
+                }
+            }
+        }
+        if (!permissionsToRequest.isEmpty()) {
+            Log.d(TAG, String.format("requesting permissions %s", String.join(" + ", permissionsToRequest.keySet().toArray(new String[0]))));
+            ActivityResultLauncher<String[]> permissionReq = registerForActivityResult(new ActivityResultContracts.RequestMultiplePermissions(), (result) -> {
+                for (var res : result.entrySet()) {
+                    var perm = res.getKey();
+                    var granted = res.getValue();
+                    if (!granted) {
+                        Log.d(TAG, String.format("permission denied: %s", perm));
+                        (new AlertDialog.Builder(this))
+                                .setTitle(getText(R.string.error_title))
+                                .setMessage(permissionsToRequest.get(perm))
+                                .setCancelable(false)
+                                .setPositiveButton(getString(R.string.button_ok), (dialog, id) -> {
+                                })
+                                .create()
+                                .show();
+                    }
+                }
+            });
+            permissionReq.launch(permissionsToRequest.keySet().toArray(new String[0]));
+        }
+    }
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        onBackPressed();
+        return true;
+    }
+
+    public static class SettingsFragment extends PreferenceFragmentCompat {
+        @Override
+        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+            setPreferencesFromResource(R.xml.preferences, rootKey);
+            PreferenceCategory category = (PreferenceCategory)getPreferenceScreen().getPreference(0);
+            int index = 0;
+            for (String[] emojis : EasterDream.EMOJI_SETS) {
+                var listPreference = new ListPreference(getPreferenceScreen().getContext());
+                @SuppressLint("DefaultLocale")
+                String k = String.format("prob_%d", index);
+                listPreference.setKey(k);
+                listPreference.setDefaultValue("1");
+                listPreference.setEntries(R.array.probability_entries_values);
+                listPreference.setEntryValues(R.array.probability_entries_values);
+                listPreference.setSummaryProvider(ListPreference.SimpleSummaryProvider.getInstance());
+                listPreference.setTitle(getString(R.string.prob_fmt, String.join("", Arrays.copyOfRange(emojis, 0, Math.min(emojis.length, 5)))));
+                category.addPreference(listPreference);
+                index++;
+            }
+        }
+    }
+}

app/src/main/res/layout/settings_activity.xml

@@ -0,0 +1,9 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/settings"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</LinearLayout>

app/src/main/res/values-zh-rCN/strings.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">EasterScrSaver</string>
+    <string name="title_activity_settings">设置</string>
+    <string name="daydream_header">屏保</string>
+    <string name="dim_screen_title">允许降低亮度</string>
+    <string name="switch_time_title">换页时间</string>
+    <string name="prob_fmt">%1$s 的出现频率</string>
+    <string name="permission_denied_read_external_storage">读取存储空间权限被拒绝，壁纸将不会显示</string>
+    <string name="error_title">错误</string>
+    <string name="button_ok">好</string>
+</resources>

app/src/main/res/values/arrays.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string-array name="switch_time_entries">
+        <item>3600</item>
+        <item>300</item>
+        <item>60</item>
+        <item>30</item>
+        <item>10</item>
+        <item>5</item>
+    </string-array>
+    <string-array name="switch_time_values">
+        <item>3600</item>
+        <item>300</item>
+        <item>60</item>
+        <item>30</item>
+        <item>10</item>
+        <item>5</item>
+    </string-array>
+    <string-array name="probability_entries_values">
+        <item>100</item>
+        <item>50</item>
+        <item>20</item>
+        <item>10</item>
+        <item>9</item>
+        <item>8</item>
+        <item>7</item>
+        <item>6</item>
+        <item>5</item>
+        <item>4</item>
+        <item>3</item>
+        <item>2</item>
+        <item>1</item>
+        <item>0</item>
+    </string-array>
+</resources>

app/src/main/res/values/strings.xml

@@ -1,3 +1,11 @@
 <resources>
     <string name="app_name">EasterScrSaver</string>
+    <string name="title_activity_settings">Settings</string>
+    <string name="daydream_header">Daydream</string>
+    <string name="dim_screen_title">Screen Dimming</string>
+    <string name="switch_time_title">Switching time</string>
+    <string name="prob_fmt">Occur freq of %1$s</string>
+    <string name="permission_denied_read_external_storage">Storage read permission denied, wallpaper can\'t be shown</string>
+    <string name="error_title">Error occurred</string>
+    <string name="button_ok">OK</string>
 </resources>

app/src/main/res/xml/easterdream.xml

@@ -0,0 +1,2 @@
+<dream xmlns:android="http://schemas.android.com/apk/res/android"
+    android:settingsActivity="cc.jerryxiao.easterscrsaver/.SettingsActivity" />

app/src/main/res/xml/preferences.xml

@@ -0,0 +1,22 @@
+<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <PreferenceCategory app:title="@string/daydream_header">
+
+        <SwitchPreferenceCompat
+            app:key="dim_screen"
+            app:title="@string/dim_screen_title"
+            app:defaultValue="false" />
+
+
+        <ListPreference
+            app:defaultValue="10"
+            app:entries="@array/switch_time_entries"
+            app:entryValues="@array/switch_time_values"
+            app:key="switch_time"
+            app:title="@string/switch_time_title"
+            app:useSimpleSummaryProvider="true" />
+
+    </PreferenceCategory>
+
+</PreferenceScreen>

build.gradle

@@ -1,6 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '8.0.2' apply false
+    id 'com.android.application' version '8.1.0' apply false
-    id 'com.android.library' version '8.0.2' apply false
+    id 'com.android.library' version '8.1.0' apply false
     id 'org.jetbrains.kotlin.android' version '1.9.0' apply false
 }