android-自定义换肤(2)

android-自定义换肤(1) https://blog.csdn.net/tiangaopan/article/details/104895134

前面说到本质上是通过实现LayoutInflater.Factory2，在onCreateView()方法中进行处理

这就需要我们找到对应的控件，控件又有系统控件和自定义控件，这里我们先说系统控件，自定义后面会说处理方法

通过看源码，我们可以找到系统控件在这三个包下，

private static final String[] mClassPrefixList = {"android.widget.", "android.view.", "android.webkit.",}private static final Class[] mConstructorSignature = new Class[]{Context.class, AttributeSet.class};
private static final HashMap<String, Constructor<? extends View>> mConstructorMap = new HashMap<>();

 @Overridepublic View onCreateView(View parent, String name, Context context, AttributeSet attrs) {//反射获取View view = createViewFromTag(name, context, attrs);//自定义viewif (view == null) {view = createView(name, context, attrs);}//筛选符合属性的attrsmSkinAttribute.load(view, attrs);return view;}

 private View createViewFromTag(String name, Context context, AttributeSet attrs) {//包含自定义控件if (-1 != name.indexOf(".")) {return null;}View view = null;for (String s : mClassPrefixList) {//mClassPrefixList[i] + name 组成全类名view = createView(s + name, context, attrs);if (view != null) {break;}}return view;}

private View createView(String name, Context context, AttributeSet attrs) {Constructor<? extends View> constructor = mConstructorMap.get(name);if (constructor == null) {try {//通过全类名拿到classClass<? extends View> aClass = context.getClassLoader().loadClass(name).asSubclass(View.class);//获取构造方法constructor = aClass.getConstructor(mConstructorSignature);mConstructorMap.put(name, constructor);} catch (Exception e) {e.printStackTrace();}}if (constructor != null) {try {return constructor.newInstance(context, attrs);} catch (Exception e) {e.printStackTrace();}}return null;}

对于已经通过反射获取到构造方法的，可以使用map进行存储，没必要每次都进行一次获取

public class SkinAttribute {private static final List<String> sAttribute = new ArrayList<>();static {sAttribute.add("background");sAttribute.add("src");sAttribute.add("textColor");sAttribute.add("drawableLeft");sAttribute.add("drawableTop");sAttribute.add("drawableRight");sAttribute.add("drawableBottom");}private List<SkinView> skinViews = new ArrayList<>();private Typeface mSkinTypeface;public SkinAttribute(Typeface skinTypeface) {mSkinTypeface = skinTypeface;}public void load(View view, AttributeSet attrs) {List<SkinPain> skinPains = new ArrayList<>();int attributeCount = attrs.getAttributeCount();for (int i = 0; i < attributeCount; i++) {//获取属性名字String attributeName = attrs.getAttributeName(i);if (sAttribute.contains(attributeName)) {//获取属性值String attributeValue = attrs.getAttributeValue(i);//写死的情况if (attributeValue.startsWith("#")) {continue;}int resId;//系统自带的 attributeValue = "?1313123"if (attributeValue.startsWith("?")) {int attrId = Integer.parseInt(attributeValue.substring(1));//存在数组的可能resId = SkinThemeUtils.getResId(view.getContext(), new int[]{attrId})[0];} else {//attributeValue = "@21321213"resId = Integer.parseInt(attributeValue.substring(1));}if (resId != 0) {SkinPain skinPain = new SkinPain(attributeName, resId);skinPains.add(skinPain);}}}if (!skinPains.isEmpty() || view instanceof TextView || view instanceof SkinViewSupport) {SkinView skinView = new SkinView(view, skinPains);skinView.applySkin(mSkinTypeface);skinViews.add(skinView);}}public void applySkin() {for (SkinView skinView : skinViews) {skinView.applySkin(mSkinTypeface);}}public void setTypeface(Typeface skinTypeface) {this.mSkinTypeface = skinTypeface;}static class SkinView {View view;List<SkinPain> skinPains;public SkinView(View view, List<SkinPain> skinPains) {this.view = view;this.skinPains = skinPains;}public void applySkin(Typeface typeface) {applyTypeface(typeface);applySkinSupport();for (SkinPain skinPair : skinPains) {Drawable left = null, top = null, right = null, bottom = null;switch (skinPair.attributeName) {case "background":Object background = SkinResources.getInstance().getBackground(skinPair.resId);//Colorif (background instanceof Integer) {view.setBackgroundColor((Integer) background);} else {ViewCompat.setBackground(view, (Drawable) background);}break;case "src":background = SkinResources.getInstance().getBackground(skinPair.resId);if (background instanceof Integer) {((ImageView) view).setImageDrawable(new ColorDrawable((Integer)background));} else {((ImageView) view).setImageDrawable((Drawable) background);}break;case "textColor":((TextView) view).setTextColor(SkinResources.getInstance().getColorStateList(skinPair.resId));break;case "drawableLeft":left = SkinResources.getInstance().getDrawable(skinPair.resId);break;case "drawableTop":top = SkinResources.getInstance().getDrawable(skinPair.resId);break;case "drawableRight":right = SkinResources.getInstance().getDrawable(skinPair.resId);break;case "drawableBottom":bottom = SkinResources.getInstance().getDrawable(skinPair.resId);break;default:break;}if (null != left || null != right || null != top || null != bottom) {((TextView) view).setCompoundDrawablesWithIntrinsicBounds(left, top, right,bottom);}}}//自定义view替换private void applySkinSupport() {if (view instanceof SkinViewSupport) {((SkinViewSupport) view).applySkin();}}//字体换肤private void applyTypeface(Typeface typeface) {if (view instanceof TextView) {((TextView) view).setTypeface(typeface);}}}static class SkinPain {String attributeName;int resId;public SkinPain(String attributeName, int resId) {this.attributeName = attributeName;this.resId = resId;}}
}

通过attributeName来知道是background，textcolor等属性，通过resid可以知道是资源名，这时候去获取资源包中的对应resid，即可实现相应的换肤

还有个需要注意的是，每个界面都应该进行相应的换肤，所以我们需要去实现Application.ActivityLifecycleCallbacks，这里去进行加载和移除

@Overridepublic void onActivityCreated(Activity activity, Bundle savedInstanceState) {//更新状态栏SkinThemeUtils.updateStatusBarColor(activity);//更新字体Typeface skinTypeface = SkinThemeUtils.getSkinTypeface(activity);try {LayoutInflater layoutInflater = LayoutInflater.from(activity);Field mFactorySet = LayoutInflater.class.getDeclaredField("mFactorySet");mFactorySet.setAccessible(true);mFactorySet.setBoolean(layoutInflater, false);SkinLayoutFactory skinLayoutFactory = new SkinLayoutFactory(activity, skinTypeface);//添加自定义创建view 工厂layoutInflater.setFactory2(skinLayoutFactory);//注册观察者SkinManager.getInstance().addObserver(skinLayoutFactory);mFactoryMap.put(activity, skinLayoutFactory);} catch (Exception e) {e.printStackTrace();}}

在这里我们对对应的setFactory2进行替换，有个需要注意的是mFactorySet这个属性，如果是true的话会抛出异常，同时该变量是私有的，所以我们需要通过反射找到该变量将其更改为false

 public void setFactory2(Factory2 factory) {if (mFactorySet) {throw new IllegalStateException("A factory has already been set on this LayoutInflater");}if (factory == null) {throw new NullPointerException("Given factory can not be null");}mFactorySet = true;if (mFactory == null) {mFactory = mFactory2 = factory;} else {mFactory = mFactory2 = new FactoryMerger(factory, factory, mFactory, mFactory2);}}

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