optimize SingleLiveData

lib_base/src/main/java/com/android/base/app/aac/SingleLiveData.java

@@ -0,0 +1,61 @@
+package com.android.base.app.aac;
+
+import android.arch.lifecycle.LifecycleOwner;
+import android.arch.lifecycle.MediatorLiveData;
+import android.arch.lifecycle.Observer;
+import android.support.annotation.NonNull;
+
+import java.util.Map;
+import java.util.WeakHashMap;
+
+import timber.log.Timber;
+
+public class SingleLiveData<T> extends MediatorLiveData<T> {
+
+    private int mVersion = 0;
+
+    private final Map<Observer<T>, Observer<T>> cache = new WeakHashMap<>();
+
+    @Override
+    public void observe(@NonNull LifecycleOwner owner, @NonNull Observer<T> observer) {
+        super.observe(owner, getOrNewObserver(observer, mVersion));
+    }
+
+    @Override
+    public void observeForever(@NonNull Observer<T> observer) {
+        super.observeForever(getOrNewObserver(observer, mVersion));
+    }
+
+    @Override
+    public void setValue(T value) {
+        mVersion++;
+        super.setValue(value);
+    }
+
+    @Override
+    public void removeObserver(@NonNull Observer<T> observer) {
+        Observer<T> wrapper = cache.remove(observer);
+        Timber.d("removeObserver() called with: observer = [" + observer + "], wrapper = [" + wrapper + "]");
+        if (wrapper != null) {
+            super.removeObserver(wrapper);
+        }
+    }
+
+    private Observer<T> getOrNewObserver(@NonNull Observer<T> observer, int observerVersion) {
+        Observer<T> wrapper = cache.get(observer);
+
+        if (wrapper == null) {
+            wrapper = t -> {
+                if (observerVersion < mVersion) {
+                    observer.onChanged(t);
+                }
+            };
+            cache.put(observer, wrapper);
+        }
+
+        Timber.d("getOrNewObserver() called with: observer = [" + observer + "], observerVersion = [" + observerVersion + "], wrapper = [" + wrapper + "]");
+
+        return wrapper;
+    }
+
+}

lib_base/src/main/java/com/android/base/app/aac/SingleLiveData.kt

@@ -1,36 +0,0 @@
-package com.android.base.app.aac
-
-import android.arch.lifecycle.LifecycleOwner
-import android.arch.lifecycle.MediatorLiveData
-import android.arch.lifecycle.Observer
-
-/** https://github.com/Shopify/livedata-ktx */
-class SingleLiveData<T> : MediatorLiveData<T>() {
-
-    private var _version = 0
-    private val version: Int get() = _version
-
-    override fun observe(owner: LifecycleOwner, observer: Observer<T>) {
-        val observerVersion = version
-        super.observe(owner, Observer {
-            if (observerVersion < version) {
-                observer.onChanged(it)
-            }
-        })
-    }
-
-    override fun observeForever(observer: Observer<T>) {
-        val observeSinceVersion = version
-        super.observeForever {
-            if (version > observeSinceVersion) {
-                observer.onChanged(it)
-            }
-        }
-    }
-
-    override fun setValue(value: T?) {
-        _version++
-        super.setValue(value)
-    }
-
-}

lib_base/src/main/java/com/android/base/kotlin/MenuEx.kt

@@ -1,7 +1,31 @@
 package com.android.base.kotlin
 
+import android.support.v7.widget.PopupMenu
+import android.view.Menu
 import android.view.MenuItem
 
+fun PopupMenu.setMenus(items: Array<String>): PopupMenu {
+    for (i in 0 until items.size) {
+        menu.add(Menu.NONE, i, i, items[i])
+    }
+    return this
+}
+
+fun PopupMenu.setMenus(items: Array<String>, ids: IntArray): PopupMenu {
+    for (i in 0 until items.size) {
+        menu.add(Menu.NONE, ids[i], i, items[i])
+    }
+    return this
+}
+
+fun PopupMenu.onMenuItemClick(listener: (id: Int) -> Unit): PopupMenu {
+    setOnMenuItemClickListener {
+        listener(it.itemId)
+        true
+    }
+    return this
+}
+
 fun MenuItem.alwaysShow(): MenuItem {
     setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS)
     return this

lib_social/src/main/java/com/android/sdk/social/wechat/SingleLiveData.java

@@ -5,32 +5,36 @@ import android.arch.lifecycle.MediatorLiveData;
 import android.arch.lifecycle.Observer;
 import android.support.annotation.NonNull;
 
+import java.util.WeakHashMap;
+
 class SingleLiveData<T> extends MediatorLiveData<T> {
 
     private int mVersion = 0;
 
+    private final WeakHashMap<Observer<T>, Observer<T>> cache = new WeakHashMap<>();
+
     @Override
     public void observe(@NonNull LifecycleOwner owner, @NonNull Observer<T> observer) {
-
-        final int observerVersion = mVersion;
-
-        super.observe(owner, t -> {
-            if (observerVersion < mVersion) {
-                observer.onChanged(t);
-            }
-        });
+        super.observe(owner, getOrNewObserver(observer, mVersion));
     }
 
     @Override
     public void observeForever(@NonNull Observer<T> observer) {
+        super.observeForever(getOrNewObserver(observer, mVersion));
+    }
 
-        final int observerVersion = mVersion;
-
-        super.observeForever(t -> {
-            if (observerVersion < mVersion) {
-                observer.onChanged(t);
-            }
-        });
+    private Observer<T> getOrNewObserver(@NonNull Observer<T> observer, int observerVersion) {
+        Observer<T> wrapper = cache.get(observer);
+
+        if (wrapper == null) {
+            wrapper = t -> {
+                if (observerVersion < mVersion) {
+                    observer.onChanged(t);
+                }
+            };
+            cache.put(observer, wrapper);
+        }
+        return wrapper;
     }
 
     @Override
@@ -39,4 +43,13 @@ class SingleLiveData<T> extends MediatorLiveData<T> {
         super.setValue(value);
     }
 
+    @Override
+    public void removeObserver(@NonNull Observer<T> observer) {
+        Observer<T> wrapper = cache.remove(observer);
+        if (wrapper != null) {
+            super.removeObserver(wrapper);
+        }
+
+    }
+
 }