MultipleTheme框架兼容RecyclerView和CardView&RecyclerView缓存机制
2016-09-17 11:01
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一.引言
最近搞了搞app无缝切换主题功能,github上看了看,流行的还是插件式,好吧。。完了研究下了。不过今天咱要搞的是MultipleTheme这个框架,也有1000多star了,应该可以吧,于是乎ji动的整到项目里准备大干一场。。。小弟沉默十分钟后,纳尼?要全部重写用到的view?!而且没有兼容RecyclerView,CardView。。。看来不维护了,行吧行吧,既然这样那就当学习了,顺便咱给他兼容一下。于是乎,有了本文~
附上框架地址:https://github.com/dersoncheng/MultipleTheme
具体使用github上作者写的很清楚,这里就不多说了。
本文内容:1.此框架技术点。
2.从源码分析RecyclerView缓存机制。
3.此框架如何兼容RecyclerView和CardView。
二.框架技术点
1.框架调用流程:
1.调用ColorUiUtil类中changeTheme(View view,Theme theme) :通过递归方式,从参数view开始遍历其所有子view,如果遍历到的view继承了ColorUiInterface接口,那么调用其实现的接口方法。public static void changeTheme(View rootView, Resources.Theme theme) { if (rootView instanceof ColorUiInterface) { ((ColorUiInterface) rootView).setTheme(theme); if (rootView instanceof ViewGroup) { int count = ((ViewGroup) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } if (rootView instanceof AbsListView) { try { Field localField = AbsListView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.widget.AbsListView$RecycleBin").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); } catch (NoSuchFieldException e1) { e1.printStackTrace(); } catch (ClassNotFoundException e2) { e2.printStackTrace(); } catch (NoSuchMethodException e3) { e3.printStackTrace(); } catch (IllegalAccessException e4) { e4.printStackTrace(); } catch (InvocationTargetException e5) { e5.printStackTrace(); } } } else { if (rootView instanceof ViewGroup) { int count = ((ViewGroup) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } if (rootView instanceof AbsListView) { try { Field localField = AbsListView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.widget.AbsListView$RecycleBin").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); } catch (NoSuchFieldException e1) { e1.printStackTrace(); } catch (ClassNotFoundException e2) { e2.printStackTrace(); } catch (NoSuchMethodException e3) { e3.printStackTrace(); } catch (IllegalAccessException e4) { e4.printStackTrace(); } catch (InvocationTargetException e5) { e5.printStackTrace(); } } } }
2.实现的接口方法,会根据需要改变的属性调用ViewAttributeUtil类中的各种方法。
如applyBackgroundDrawable(Context,Theme,attrId):最后这个方法会根据Theme获取到对应的drawable,调用这个view的setBackGroundDrawable()方法实现设置背景。
public static void applyBackgroundDrawable(ColorUiInterface ci, Resources.Theme theme, int paramInt) { TypedArray ta = theme.obtainStyledAttributes(new int[]{paramInt}); Drawable drawable = ta.getDrawable(0); if (null != ci) { (ci.getView()).setBackgroundDrawable(drawable); } ta.recycle(); }
3.上面applyBackgroundDrawable(Context,Theme,attrId)方法中第三个参数attrid,又是从ViewAttributeUtil类中getBackGroundAttribute(AttributeSet)得到的:
public static int getBackgroundAttibute(AttributeSet attr) { return getAttributeValue(attr, android.R.attr.background); } public static int getAttributeValue(AttributeSet attr, int paramInt) { int value = -1; int count = attr.getAttributeCount(); for (int i = 0; i < count; i++) { if (attr.getAttributeNameResource(i) == paramInt) { String str = attr.getAttributeValue(i); if (null != str && str.startsWith("?")) { value = Integer.valueOf(str.substring(1, str.length())).intValue(); return value; } } } return value; }
2.清空listView缓存,做到listView所有item都成功改变theme
public static void changeTheme(View rootView, Resources.Theme theme) { if (rootView instanceof ColorUiInterface) { ((ColorUiInterface) rootView).setTheme(theme); if (rootView instanceof ViewGroup) { int count = ((ViewGroup) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } if (rootView instanceof AbsListView) { try { Field localField = AbsListView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.widget.AbsListView$RecycleBin").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); } catch 。。。省略异常 } } else { if (rootView instanceof ViewGroup) { int count = ((ViewGroup) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } if (rootView instanceof AbsListView) { try { Field localField = AbsListView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.widget.AbsListView$RecycleBin").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); } catch<span style="font-family: Arial, Helvetica, sans-serif;">。。。省略异常</span> } } }
咱们看上面这个重要的方法:由于ListView也是ViewGroup,并有缓存机制,在换肤后会有缓存的item再次被复用时,此项item没有改变theme。就会出现当前可见item换了主题,滑动列表,之前不可见的有一部分item的theme没有发生变化。
于是这方法,通过反射调用了缓存管理类内部类——RecyclerBin中clear()方法,清空所有item,让listview将所有item重新创建一遍。
那根据这个原理,将RecyclerView中缓存做一下清空。下面先介绍一下RecyclerView缓存机制和兼容。
三.RecyclerView缓存机制
1.RecyclerView缓存机制
RecyclerView中也有管理缓存的内部类:Recycler。LayoutManager获取Adapter某一项的View时会调用Recycler中的方法获取。2.如下是Recyler的几个关键成员变量和方法:
private ArrayList<ViewHolder> mAttachedScrap :未与RecyclerView分离的ViewHolder列表。private ArrayList<ViewHolder> mChangedScrap: 分离的ViewHolder列表。
private ArrayList<ViewHolder> mCachedViews: ViewHolder缓存列表。会默认缓存
private ViewCacheExtension mViewCacheExtension: 开发者可以控制的ViewHolder缓存。
private RecycledViewPool mRecyclerPool: 提供复用ViewHolder池。
public void bindViewToPosition(View view, int position) :将某个View绑定到Adapter的某个位置。
public View getViewForPosition(int position):LayoutManager通过此方法获取某一项的view。
3.LayoutManager会通过其中getViewForPosition方法获取缓存的view:获取缓存view顺序是:
(1)mChangedScrap查找,若匹配到则返回相应holder (2)mAttachedScrap查找,若匹配到且holder有效则返回相应holder
(3)mViewCacheExtension查找,若匹配到则返回相应holder
(4)mRecyclerPool中查找,若匹配到则返回相应holder
(5)还是没有匹配的,那么adapter.createViewHolder(),创建新的holder
(6)返回holder.itemView
四.此框架如何兼容RecyclerView和CardView。
1.兼容RecyclerView
为了保证改变所有item的theme,所以要情况缓存。那么从上面缓存机制知道,我们需要把 mAttachedScrap ,mChangedScrap,mCachedViews,mViewCacheExtension,mRecyclerPool中的缓存都清空掉。在Recycler类中有三个方法可以清空数据:
(1)clear()
(2)clearScrap()
(3)RecycledViewPool中的clear()
兼容后的ColorUiUtil类:
import android.content.res.Resources; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; public class ColorUiUtil { public static void changeTheme(View rootView, Resources.Theme theme) { if (rootView instanceof ColorUiInterface) { ((ColorUiInterface) rootView).setTheme(theme); if (rootView instanceof RecyclerView) { int count = ((RecyclerView) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } else if (rootView instanceof ViewGroup) { int count = ((ViewGroup) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } if (rootView instanceof AbsListView) { try { Field localField = AbsListView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.widget.AbsListView$RecycleBin").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); } catch (NoSuchFieldException e1) { e1.printStackTrace(); } catch (ClassNotFoundException e2) { e2.printStackTrace(); } catch (NoSuchMethodException e3) { e3.printStackTrace(); } catch (IllegalAccessException e4) { e4.printStackTrace(); } catch (InvocationTargetException e5) { e5.printStackTrace(); } } else if (rootView instanceof RecyclerView) { try { Field localField = RecyclerView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.support.v7.widget.RecyclerView$Recycler").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); Method localMethod1 = Class.forName("android.support.v7.widget.RecyclerView$Recycler").getDeclaredMethod("clearScrap"); localMethod1.setAccessible(true); localMethod1.invoke(localField.get(rootView)); ((RecyclerView) rootView).getRecycledViewPool().clear(); } catch (NoSuchFieldException e1) { e1.printStackTrace(); } catch (ClassNotFoundException e2) { e2.printStackTrace(); } catch (NoSuchMethodException e3) { e3.printStackTrace(); } catch (IllegalAccessException e4) { e4.printStackTrace(); } catch (InvocationTargetException e5) { e5.printStackTrace(); } } } else { if (rootView instanceof RecyclerView) { int count = ((RecyclerView) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } else if (rootView instanceof ViewGroup) { int count = ((ViewGroup) rootView).getChildCount(); for (int i = 0; i < count; i++) { changeTheme(((ViewGroup) rootView).getChildAt(i), theme); } } if (rootView instanceof AbsListView) { try { Field localField = AbsListView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.widget.AbsListView$RecycleBin").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); } catch (NoSuchFieldException e1) { e1.printStackTrace(); } catch (ClassNotFoundException e2) { e2.printStackTrace(); } catch (NoSuchMethodException e3) { e3.printStackTrace(); } catch (IllegalAccessException e4) { e4.printStackTrace(); } catch (InvocationTargetException e5) { e5.printStackTrace(); } } else if (rootView instanceof RecyclerView) { try { Field localField = RecyclerView.class.getDeclaredField("mRecycler"); localField.setAccessible(true); Method localMethod = Class.forName("android.support.v7.widget.RecyclerView$Recycler").getDeclaredMethod("clear"); localMethod.setAccessible(true); localMethod.invoke(localField.get(rootView)); Method localMethod1 = Class.forName("android.support.v7.widget.RecyclerView$Recycler").getDeclaredMethod("clearScrap"); localMethod1.setAccessible(true); localMethod1.invoke(localField.get(rootView)); ((RecyclerView) rootView).getRecycledViewPool().clear(); } catch (NoSuchFieldException e1) { e1.printStackTrace(); } catch (ClassNotFoundException e2) { e2.printStackTrace(); } catch (NoSuchMethodException e3) { e3.printStackTrace(); } catch (IllegalAccessException e4) { e4.printStackTrace(); } catch (InvocationTargetException e5) { e5.printStackTrace(); } } } } }
3.兼容CardView
cardView设置其背景颜色有自己的方法:
setCardBackgroundColor(Color) xml中:app:cardBackgroundColor="?attr/colorPrimaryDark"因为CardView继承自FrameLayout,所以也可以用setBackGroundDrawable(),但是测试下,在列表中,会出现更改theme无效的bug。
框架中做如下修改:
(1)在ViewAttributeUtil类中增加一个方法:public static int getCardViewAttribute(AttributeSet attributeSet) { return getAttributeValue(attributeSet, android.support.v7.cardview.R.attr.cardBackgroundColor); }(2)在ViewAttributeUtil类中增加一个方法:
public static void applyCardViewBackgroundColor(ColorUiInterface ci, Resources.Theme theme, int paramInt) { TypedArray ta = theme.obtainStyledAttributes(new int[]{paramInt}); int color = ta.getColor(0, Color.GREEN); if (null != ci) { ((CardView)ci.getView()).setCardBackgroundColor(color); } ta.recycle(); }(3)在自定义ColorCardView类中,调用的就是上面两个方法了。
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