优化: 使用位运算对适配信息的缓存进行优化

Author: JessYanCoding

autosize/src/main/java/me/jessyan/autosize/AutoSize.java

@@ -23,11 +23,10 @@
 import android.content.res.Resources;
 import android.net.Uri;
 import android.util.DisplayMetrics;
+import android.util.SparseArray;
 import android.view.View;
 
 import java.util.Locale;
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 
 import me.jessyan.autosize.external.ExternalAdaptInfo;
 import me.jessyan.autosize.external.ExternalAdaptManager;
@@ -51,7 +50,11 @@
  * ================================================
  */
 public final class AutoSize {
-    private static Map<String, DisplayMetricsInfo> mCache = new ConcurrentHashMap<>();
+    private static SparseArray<DisplayMetricsInfo> mCache = new SparseArray<>();
+    private static final int MODE_SHIFT = 30;
+    private static final int MODE_MASK  = 0x3 << MODE_SHIFT;
+    private static final int MODE_ON_WIDTH  = 1 << MODE_SHIFT;
+    private static final int MODE_DEVICE_SIZE  = 2 << MODE_SHIFT;
 
     private AutoSize() {
         throw new IllegalStateException("you can't instantiate me!");
@@ -172,17 +175,18 @@ public static void autoConvertDensityBaseOnHeight(Activity activity, float desig
      */
     public static void autoConvertDensity(Activity activity, float sizeInDp, boolean isBaseOnWidth) {
         Preconditions.checkNotNull(activity, "activity == null");
+        Preconditions.checkMainThread();
 
         float subunitsDesignSize = isBaseOnWidth ? AutoSizeConfig.getInstance().getUnitsManager().getDesignWidth()
                 : AutoSizeConfig.getInstance().getUnitsManager().getDesignHeight();
         subunitsDesignSize = subunitsDesignSize > 0 ? subunitsDesignSize : sizeInDp;
 
         int screenSize = isBaseOnWidth ? AutoSizeConfig.getInstance().getScreenWidth()
                 : AutoSizeConfig.getInstance().getScreenHeight();
-        String key = sizeInDp + "|" + subunitsDesignSize + "|" + isBaseOnWidth + "|"
-                + AutoSizeConfig.getInstance().isUseDeviceSize() + "|"
-                + AutoSizeConfig.getInstance().getInitScaledDensity() + "|"
-                + screenSize;
+
+        int key = Math.round(sizeInDp + subunitsDesignSize + AutoSizeConfig.getInstance().getInitScaledDensity() + screenSize) & ~MODE_MASK;
+        key = isBaseOnWidth ? (key | MODE_ON_WIDTH) : (key & ~MODE_ON_WIDTH);
+        key = AutoSizeConfig.getInstance().isUseDeviceSize() ? (key | MODE_DEVICE_SIZE) : (key & ~MODE_DEVICE_SIZE);
 
         DisplayMetricsInfo displayMetricsInfo = mCache.get(key);
 
@@ -242,6 +246,7 @@ public static void autoConvertDensity(Activity activity, float sizeInDp, boolean
      * @param activity {@link Activity}
      */
     public static void cancelAdapt(Activity activity) {
+        Preconditions.checkMainThread();
         float initXdpi = AutoSizeConfig.getInstance().getInitXdpi();
         switch (AutoSizeConfig.getInstance().getUnitsManager().getSupportSubunits()) {
             case PT:

autosize/src/main/java/me/jessyan/autosize/AutoSizeCompat.java

@@ -19,9 +19,7 @@
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.util.DisplayMetrics;
-
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
+import android.util.SparseArray;
 
 import me.jessyan.autosize.external.ExternalAdaptInfo;
 import me.jessyan.autosize.external.ExternalAdaptManager;
@@ -39,7 +37,11 @@
  * ================================================
  */
 public final class AutoSizeCompat {
-    private static Map<String, DisplayMetricsInfo> mCache = new ConcurrentHashMap<>();
+    private static SparseArray<DisplayMetricsInfo> mCache = new SparseArray<>();
+    private static final int MODE_SHIFT = 30;
+    private static final int MODE_MASK  = 0x3 << MODE_SHIFT;
+    private static final int MODE_ON_WIDTH  = 1 << MODE_SHIFT;
+    private static final int MODE_DEVICE_SIZE  = 2 << MODE_SHIFT;
 
     private AutoSizeCompat() {
         throw new IllegalStateException("you can't instantiate me!");
@@ -134,17 +136,18 @@ public static void autoConvertDensityBaseOnHeight(Resources resources, float des
      */
     public static void autoConvertDensity(Resources resources, float sizeInDp, boolean isBaseOnWidth) {
         Preconditions.checkNotNull(resources, "resources == null");
+        Preconditions.checkMainThread();
 
         float subunitsDesignSize = isBaseOnWidth ? AutoSizeConfig.getInstance().getUnitsManager().getDesignWidth()
                 : AutoSizeConfig.getInstance().getUnitsManager().getDesignHeight();
         subunitsDesignSize = subunitsDesignSize > 0 ? subunitsDesignSize : sizeInDp;
 
         int screenSize = isBaseOnWidth ? AutoSizeConfig.getInstance().getScreenWidth()
                 : AutoSizeConfig.getInstance().getScreenHeight();
-        String key = sizeInDp + "|" + subunitsDesignSize + "|" + isBaseOnWidth + "|"
-                + AutoSizeConfig.getInstance().isUseDeviceSize() + "|"
-                + AutoSizeConfig.getInstance().getInitScaledDensity() + "|"
-                + screenSize;
+
+        int key = Math.round(sizeInDp + subunitsDesignSize + AutoSizeConfig.getInstance().getInitScaledDensity() + screenSize) & ~MODE_MASK;
+        key = isBaseOnWidth ? (key | MODE_ON_WIDTH) : (key & ~MODE_ON_WIDTH);
+        key = AutoSizeConfig.getInstance().isUseDeviceSize() ? (key | MODE_DEVICE_SIZE) : (key & ~MODE_DEVICE_SIZE);
 
         DisplayMetricsInfo displayMetricsInfo = mCache.get(key);
 
@@ -199,6 +202,7 @@ public static void autoConvertDensity(Resources resources, float sizeInDp, boole
      * @param resources {@link Resources}
      */
     public static void cancelAdapt(Resources resources) {
+        Preconditions.checkMainThread();
         float initXdpi = AutoSizeConfig.getInstance().getInitXdpi();
         switch (AutoSizeConfig.getInstance().getUnitsManager().getSupportSubunits()) {
             case PT:

autosize/src/main/java/me/jessyan/autosize/utils/Preconditions.java

@@ -15,6 +15,8 @@
  */
 package me.jessyan.autosize.utils;
 
+import android.os.Looper;
+
 /**
  * ================================================
  * Created by JessYan on 26/09/2016 13:59
@@ -100,6 +102,18 @@ public static int checkElementIndex(int index, int size, String desc) {
         }
     }
 
+    /**
+     * Throws {@link IllegalStateException} if the calling thread is not the application's main
+     * thread.
+     *
+     * @throws IllegalStateException If the calling thread is not the application's main thread.
+     */
+    public static void checkMainThread() {
+        if (Looper.myLooper() != Looper.getMainLooper()) {
+            throw new IllegalStateException("Not in applications main thread");
+        }
+    }
+
     private static String badElementIndex(int index, int size, String desc) {
         if (index < 0) {
             return format("%s (%s) must not be negative", new Object[]{desc, Integer.valueOf(index)});