Add set read cache max size

app/src/main/java/com/hippo/ehviewer/Settings.java

@@ -822,6 +822,13 @@ public class Settings {
         putString(KEY_SECURITY, value);
     }
 
+    public static final String KEY_READ_CACHE_SIZE = "read_cache_size";
+    public static final int DEFAULT_READ_CACHE_SIZE = 160;
+
+    public static int getReadCacheSize() {
+        return getIntFromStr(KEY_READ_CACHE_SIZE, DEFAULT_READ_CACHE_SIZE);
+    }
+
     /********************
      ****** Guide
      ********************/

app/src/main/java/com/hippo/ehviewer/spider/SpiderDen.java

@@ -34,6 +34,7 @@ import com.hippo.unifile.FilenameFilter;
 import com.hippo.unifile.UniFile;
 import com.hippo.yorozuya.FileUtils;
 import com.hippo.yorozuya.IOUtils;
+import com.hippo.yorozuya.MathUtils;
 import com.hippo.yorozuya.Utilities;
 import com.hippo.yorozuya.io.InputStreamPipe;
 import com.hippo.yorozuya.io.OutputStreamPipe;
@@ -54,7 +55,8 @@ public final class SpiderDen {
     private static SimpleDiskCache sCache;
 
     public static void initialize(Context context) {
-        sCache = new SimpleDiskCache(new File(context.getCacheDir(), "image"), 160 * 1024 * 1024);
+        sCache = new SimpleDiskCache(new File(context.getCacheDir(), "image"),
+                MathUtils.clamp(Settings.getReadCacheSize(), 40, 640) * 1024 * 1024);
     }
 
     private static class StartWithFilenameFilter implements FilenameFilter {

app/src/main/java/com/hippo/preference/ListPreference.java

@@ -25,6 +25,7 @@ import android.support.annotation.ArrayRes;
 import android.support.v7.app.AlertDialog;
 import android.text.TextUtils;
 import android.util.AttributeSet;
+import android.util.Log;
 
 import com.hippo.ehviewer.R;
 
@@ -139,6 +140,9 @@ public class ListPreference extends DialogPreference {
      * @param value The value to set for the key.
      */
     public void setValue(String value) {
+
+        Log.d("TAG", "value = " + value);
+
         // Always persist/notify the first time.
         final boolean changed = !TextUtils.equals(mValue, value);
         if (changed || !mValueSet) {