Add clear image memory cache

app/src/main/java/com/hippo/ehviewer/ui/scene/preference/AdvanceSettingsScene.java

@@ -18,21 +18,26 @@ package com.hippo.ehviewer.ui.scene.preference;
 
 import android.content.res.Resources;
 
+import com.hippo.conaco.Conaco;
 import com.hippo.ehviewer.BuildConfig;
 import com.hippo.ehviewer.Constants;
+import com.hippo.ehviewer.EhApplication;
 import com.hippo.ehviewer.R;
 import com.hippo.scene.preference.Preference;
-import com.hippo.scene.preference.PreferenceCategory;
 import com.hippo.scene.preference.PreferenceScene;
 import com.hippo.scene.preference.PreferenceSet;
 import com.hippo.scene.preference.SwitchPreference;
+import com.hippo.yorozuya.FileUtils;
 import com.hippo.yorozuya.Messenger;
 
-public class AdvanceSettingsScene extends PreferenceScene implements Preference.OnValueChangeListener {
+public class AdvanceSettingsScene extends PreferenceScene implements
+        Preference.OnValueChangeListener, Preference.OnClickListener {
 
     private static final String KEY_SHOW_APPLICATION_STATS = "show_application_stats";
     private static final boolean DEFAULT_SHOW_APPLICATION_STATS = BuildConfig.DEBUG;
 
+    private static final String KEY_CLEAR_IMAGE_MEMORY_CACHE = "clear_image_memory_cache";
+
     @Override
     protected void onCreate(boolean rebirth) {
         super.onCreate(rebirth);
@@ -51,18 +56,26 @@ public class AdvanceSettingsScene extends PreferenceScene implements Preference.
     private PreferenceSet[] getPreferenceSet() {
         Resources resources = getStageActivity().getResources();
 
+        // Stats
         SwitchPreference statsPreference = new SwitchPreference(KEY_SHOW_APPLICATION_STATS,
                 resources.getString(R.string.settings_show_application_stats_title),
                 resources.getString(R.string.settings_show_application_stats_summary));
         statsPreference.setDefaultValue(DEFAULT_SHOW_APPLICATION_STATS);
         statsPreference.setOnValueChangeListener(this);
 
+        // Clear memory cache
+        Conaco conaco = EhApplication.getConaco(getStageActivity());
+        Preference clearMemoryCachePreference = new Preference(KEY_CLEAR_IMAGE_MEMORY_CACHE,
+                resources.getString(R.string.settings_clear_image_memory_cache_title),
+                String.format(resources.getString(R.string.settings_clear_image_memory_cache_summary),
+                        FileUtils.humanReadableByteCount(conaco.memoryCacheSize(), false)));
+        clearMemoryCachePreference.setOnClickListener(this);
+
         PreferenceSet preferenceSet = new PreferenceSet();
-        preferenceSet.setPreferenceCategory(
-                new PreferenceCategory(resources.getString(R.string.settings_advance)));
 
         preferenceSet.setPreferenceList(new Preference[] {
-                statsPreference
+                statsPreference,
+                clearMemoryCachePreference
         });
 
         return new PreferenceSet[] {
@@ -81,4 +94,21 @@ public class AdvanceSettingsScene extends PreferenceScene implements Preference.
                 return true;
         }
     }
+
+    @Override
+    public boolean onClick(Preference preference) {
+        String key = preference.getKey();
+        switch (key) {
+            case KEY_CLEAR_IMAGE_MEMORY_CACHE:
+                Conaco conaco = EhApplication.getConaco(getStageActivity());
+                conaco.clearMemoryCache();
+                Runtime.getRuntime().gc();
+                preference.setSummary(String.format(getStageActivity().getString(
+                        R.string.settings_clear_image_memory_cache_summary),
+                        FileUtils.humanReadableByteCount(conaco.memoryCacheSize(), false)));
+                return true;
+            default:
+                return false;
+        }
+    }
 }

app/src/main/java/com/hippo/scene/preference/Preference.java

@@ -26,12 +26,12 @@ import android.widget.FrameLayout;
 
 import com.hippo.ehviewer.R;
 
+// TODO Need a better way to update it
 public class Preference extends PreferenceBase {
 
     private int mPosition;
 
-    private @NonNull
-    String mKey;
+    private @NonNull String mKey;
     private String mTitle;
     private String mSummary;
 
@@ -57,6 +57,11 @@ public class Preference extends PreferenceBase {
         return mSummary;
     }
 
+    public void setSummary(String summary) {
+        mSummary = summary;
+        updateSummary(null);
+    }
+
     public int getPosition() {
         return mPosition;
     }