android插件化开发---换肤
android插件化开发—换肤
在自己手写换肤功能之前需要了解关于view的创建过程，如果不了解的朋友可以看下我另外一篇博客：android中布局和View创建
从上一篇文章中我们知道在创建view之前，会先调用LayoutInflater中的mFactory2，mFactory，mPrivateFactory的onCreateView，所以我们只要设置Factory，就可以对view创建进行拦截，
先看下效果图：
换肤前
换肤后
下面让我们来一起来看下代码：
@Override
protected void onCreate(Bundle savedInstanceState) {
//在onCreate前设置Factory
/**
* AppCompatDelegateImplV9--->installViewFactory()
*
* LayoutInflater layoutInflater = LayoutInflater.from(mContext);
* if (layoutInflater.getFactory() == null) {
* LayoutInflaterCompat.setFactory(layoutInflater, this);
* }
*
*/
//换肤
LayoutInflater layoutInflater = LayoutInflater.from(this);
LayoutInflaterCompat.setFactory(layoutInflater,this);
super.onCreate(savedInstanceState);
}
下面来看下LayoutInflaterFactory实现：
@Override
public View onCreateView(View parent, String name, Context context, AttributeSet attrs) {
Log.e(TAG,"======>Name====="+name);
//1.创建view
View view =createView(parent, name, context, attrs);
Log.e(TAG,"======>onCreateView====》"+view);
//2.解析属性
if(view!=null) {
Log.e(TAG,"======>onCreateView====》111111111");
List skinAttrs = SkinAttrSupport.getSkinAttrs(context, attrs);
SkinView skinView=new SkinView(view,skinAttrs);
//3.交给skinmangager统一管理
managerSkinView(skinView);
//4.判断是否要换皮肤
SkinManager.getInstance().checkChangeSkin(skinView);
}
return view;
}
/**
* 创建view 来自系统原码
* @param parent
* @param name
* @param context
* @param attrs
* @return
*/
public View createView(View parent, final String name, @NonNull Context context,
@NonNull AttributeSet attrs) {
final boolean isPre21 = Build.VERSION.SDK_INT < 21;
if (mAppCompatViewInflater == null) {
mAppCompatViewInflater = new SkinAppCompatViewInflater();
}
// We only want the View to inherit its context if we're running pre-v21
final boolean inheritContext = isPre21 && true && shouldInheritContext((ViewParent) parent);
return mAppCompatViewInflater.createView(parent, name, context, attrs, inheritContext,
isPre21, /* Only read android:theme pre-L (L+ handles this anyway) */
true, /* Read read app:theme as a fallback at all times for legacy reasons */
VectorEnabledTintResources.shouldBeUsed() /* Only tint wrap the context if enabled */
);
}
大家可以看到，这边其实就是对创建view做了个拦截，用我们直接写的createView来创建view，因为我们这个换肤要保证新版本控件的特性，所以mAppCompatViewInflater.createView（）来创建view,这是对新版本的兼容类：
public class SkinAppCompatViewInflater {
private static final Class[] sConstructorSignature = new Class[]{
Context.class, AttributeSet.class};
private static final int[] sOnClickAttrs = new int[]{android.R.attr.onClick};
private static final String[] sClassPrefixList = {
"android.widget.",
"android.view.",
"android.webkit."
};
private static final String LOG_TAG = "AppCompatViewInflater";
private static final Map> sConstructorMap
= new ArrayMap<>();
private final Object[] mConstructorArgs = new Object[2];
public final View createView(View parent, final String name, @NonNull Context context,
@NonNull AttributeSet attrs, boolean inheritContext,
boolean readAndroidTheme, boolean readAppTheme, boolean wrapContext) {
final Context originalContext = context;
Log.e("CompatViewInflater","=====>"+inheritContext+"-"+parent+"-"+readAndroidTheme+"-"+readAppTheme);
// We can emulate Lollipop's android:theme attribute propagating down the view hierarchy
// by using the parent's context
if (inheritContext && parent != null) {
context = parent.getContext();
}
if (readAndroidTheme || readAppTheme) {
// We then apply the theme on the context, if specified
context = themifyContext(context, attrs, readAndroidTheme, readAppTheme);
}
if(context == originalContext){
Log.e("CompatViewInflater","=====>tttttttttttttttttttttttttttttttttttttttttt");
}
if (wrapContext) {
context = TintContextWrapper.wrap(context);
}
View view = null;
// We need to 'inject' our tint aware Views in place of the standard framework versions
switch (name) {
case "TextView":
view = new AppCompatTextView(context, attrs);
break;
case "ImageView":
view = new AppCompatImageView(context, attrs);
break;
case "Button":
view = new AppCompatButton(context, attrs);
break;
case "EditText":
view = new AppCompatEditText(context, attrs);
break;
case "Spinner":
view = new AppCompatSpinner(context, attrs);
break;
case "ImageButton":
view = new AppCompatImageButton(context, attrs);
break;
case "CheckBox":
view = new AppCompatCheckBox(context, attrs);
break;
case "RadioButton":
view = new AppCompatRadioButton(context, attrs);
break;
case "CheckedTextView":
view = new AppCompatCheckedTextView(context, attrs);
break;
case "AutoCompleteTextView":
view = new AppCompatAutoCompleteTextView(context, attrs);
break;
case "MultiAutoCompleteTextView":
view = new AppCompatMultiAutoCompleteTextView(context, attrs);
break;
case "RatingBar":
view = new AppCompatRatingBar(context, attrs);
break;
case "SeekBar":
view = new AppCompatSeekBar(context, attrs);
break;
}
Log.e("SkinAppCompat","======>111111111111111111");
// if (view == null && originalContext != context) {
if (view == null ) {
// If the original context does not equal our themed context, then we need to manually
// inflate it using the name so that android:theme takes effect.
Log.e("SkinAppCompat","======>22222222222222222222222");
view = createViewFromTag(context, name, attrs);
}
if (view != null) {
// If we have created a view, check it's android:onClick
checkOnClickListener(view, attrs);
}
return view;
}
private View createViewFromTag(Context context, String name, AttributeSet attrs) {
if (name.equals("view")) {
name = attrs.getAttributeValue(null, "class");
}
try {
mConstructorArgs[0] = context;
mConstructorArgs[1] = attrs;
if (-1 == name.indexOf('.')) {
for (int i = 0; i < sClassPrefixList.length; i++) {
final View view = createView(context, name, sClassPrefixList[i]);
if (view != null) {
return view;
}
}
return null;
} else {
return createView(context, name, null);
}
} catch (Exception e) {
// We do not want to catch these, lets return null and let the actual LayoutInflater
// try
return null;
} finally {
// Don't retain references on context.
mConstructorArgs[0] = null;
mConstructorArgs[1] = null;
}
}
/**
* android:onClick doesn't handle views with a ContextWrapper context. This method
* backports new framework functionality to traverse the Context wrappers to find a
* suitable target.
*/
private void checkOnClickListener(View view, AttributeSet attrs) {
final Context context = view.getContext();
if (!(context instanceof ContextWrapper) ||
(Build.VERSION.SDK_INT >= 15 && !ViewCompat.hasOnClickListeners(view))) {
// Skip our compat functionality if: the Context isn't a ContextWrapper, or
// the view doesn't have an OnClickListener (we can only rely on this on API 15+ so
// always use our compat code on older devices)
return;
}
final TypedArray a = context.obtainStyledAttributes(attrs, sOnClickAttrs);
final String handlerName = a.getString(0);
if (handlerName != null) {
view.setOnClickListener(new DeclaredOnClickListener(view, handlerName));
}
a.recycle();
}
private View createView(Context context, String name, String prefix)
throws ClassNotFoundException, InflateException {
Constructor constructor = sConstructorMap.get(name);
try {
if (constructor == null) {
// Class not found in the cache, see if it's real, and try to add it
Class clazz = context.getClassLoader().loadClass(
prefix != null ? (prefix + name) : name).asSubclass(View.class);
constructor = clazz.getConstructor(sConstructorSignature);
sConstructorMap.put(name, constructor);
}
constructor.setAccessible(true);
return constructor.newInstance(mConstructorArgs);
} catch (Exception e) {
// We do not want to catch these, lets return null and let the actual LayoutInflater
// try
return null;
}
}
/**
* Allows us to emulate the {@code android:theme} attribute for devices before L.
*/
private static Context themifyContext(Context context, AttributeSet attrs,
boolean useAndroidTheme, boolean useAppTheme) {
final TypedArray a = context.obtainStyledAttributes(attrs, android.support.v7.appcompat.R.styleable.View, 0, 0);
int themeId = 0;
if (useAndroidTheme) {
// First try reading android:theme if enabled
themeId = a.getResourceId(android.support.v7.appcompat.R.styleable.View_android_theme, 0);
}
if (useAppTheme && themeId == 0) {
// ...if that didn't work, try reading app:theme (for legacy reasons) if enabled
themeId = a.getResourceId(android.support.v7.appcompat.R.styleable.View_theme, 0);
if (themeId != 0) {
Log.i(LOG_TAG, "app:theme is now deprecated. "
+ "Please move to using android:theme instead.");
}
}
a.recycle();
if (themeId != 0 && (!(context instanceof ContextThemeWrapper)
|| ((ContextThemeWrapper) context).getThemeResId() != themeId)) {
// If the context isn't a ContextThemeWrapper, or it is but does not have
// the same theme as we need, wrap it in a new wrapper
context = new ContextThemeWrapper(context, themeId);
}
return context;
}
/**
* An implementation of OnClickListener that attempts to lazily load a
* named click handling method from a parent or ancestor context.
*/
private static class DeclaredOnClickListener implements View.OnClickListener {
private final View mHostView;
private final String mMethodName;
private Method mResolvedMethod;
private Context mResolvedContext;
public DeclaredOnClickListener(@NonNull View hostView, @NonNull String methodName) {
mHostView = hostView;
mMethodName = methodName;
}
@Override
public void onClick(@NonNull View v) {
if (mResolvedMethod == null) {
resolveMethod(mHostView.getContext(), mMethodName);
}
try {
mResolvedMethod.invoke(mResolvedContext, v);
} catch (IllegalAccessException e) {
throw new IllegalStateException(
"Could not execute non-public method for android:onClick", e);
} catch (InvocationTargetException e) {
throw new IllegalStateException(
"Could not execute method for android:onClick", e);
}
}
@NonNull
private void resolveMethod(@Nullable Context context, @NonNull String name) {
while (context != null) {
try {
if (!context.isRestricted()) {
final Method method = context.getClass().getMethod(mMethodName, View.class);
if (method != null) {
mResolvedMethod = method;
mResolvedContext = context;
return;
}
}
} catch (NoSuchMethodException e) {
// Failed to find method, keep searching up the hierarchy.
}
if (context instanceof ContextWrapper) {
context = ((ContextWrapper) context).getBaseContext();
} else {
// Can't search up the hierarchy, null out and fail.
context = null;
}
}
final int id = mHostView.getId();
final String idText = id == View.NO_ID ? "" : " with id '"
+ mHostView.getContext().getResources().getResourceEntryName(id) + "'";
throw new IllegalStateException("Could not find method " + mMethodName
+ "(View) in a parent or ancestor Context for android:onClick "
+ "attribute defined on view " + mHostView.getClass() + idText);
}
}
}
看过上一篇博客的小伙伴应该对这个类有点也不陌生，这个就是创建view的兼容类。
基本的代码已经看完，现在我们就来写换肤的基础类：
public class SkinAttr {
//资源名
private String mResName;
//属性类型
private SkinType mSkinType;
public SkinAttr(String name, SkinType skinType) {
this.mResName=name;
this.mSkinType=skinType;
}
/**
* 跟换view的属性资源
* @param mView
*/
public void skin(View mView) {
mSkinType.skin(mView,mResName);
}
}
public enum SkinType {
TEXT_COLOR("textColor") {
@Override
public void skin(View mView, String mResName) {
SkinResource resource = getSkinResource();
ColorStateList colorStateList = resource.getColorByName(mResName);
Log.e("tag","textColor=====>"+mResName+"==="+colorStateList);
if(colorStateList == null){
return;
}
TextView tv= (TextView) mView;
tv.setTextColor(colorStateList);
}
},BACKGROUND("background") {
@Override
public void skin(View mView, String mResName) {
SkinResource resource = getSkinResource();
Drawable drawable = resource.getDrawableByName(mResName);
if(drawable != null){
mView.setBackgroundDrawable(drawable);
return;
}
ColorStateList color = resource.getColorByName(mResName);
if(color!=null){
mView.setBackgroundColor(color.getDefaultColor());
}
}
},SRC("src") {
@Override
public void skin(View mView, String mResName) {
SkinResource resource = getSkinResource();
Drawable drawable = resource.getDrawableByName(mResName);
if(drawable != null) {
ImageView iv = (ImageView) mView;
iv.setImageDrawable(drawable);
}
}
};
private String mResName;
SkinType(String name){
this.mResName=name;
}
public abstract void skin(View mView, String mResName);
public String getResName() {
return mResName;
}
public SkinResource getSkinResource(){
return SkinManager.getInstance().getSkinResource();
}
}
public class SkinView {
private View mView;
private List mAttrs;
public SkinView(View view, List skinAttrs) {
this.mView=view;
this.mAttrs=skinAttrs;
}
/**
* 当前view中属性更换资源
*/
public void skin(){
for (SkinAttr attr : mAttrs) {
attr.skin(mView);
}
}
}
下面就是一些简单的保存view以及属性的类，下面来重点看下SkinManager和SkinResource类
SkinManager
public class SkinManager {
static SkinManager mSkinManager = null;
Map> mSkinViews= new ArrayMap<>();
private Context mContext = null;
static {
mSkinManager=new SkinManager();
}
private SkinResource mSkinResource;
public static SkinManager getInstance(){
return mSkinManager;
}
public void init(Context context){
mContext = context.getApplicationContext();
String DefaultResourcePath = mContext.getPackageResourcePath();
String skinPath = SkinUtil.getInstance(mContext).getSkinPath();
if(TextUtils.isEmpty(skinPath)) {
//初始化资源管理
mSkinResource = new SkinResource(mContext,DefaultResourcePath);
return;
}
File skinFile = new File(skinPath);
if(!skinFile.exists()){
SkinUtil.getInstance(mContext).saveSkinPath("");
//初始化资源管理
mSkinResource = new SkinResource(mContext,DefaultResourcePath);
return;
}
String packageName = context.getPackageManager().getPackageArchiveInfo(skinPath, PackageManager.GET_ACTIVITIES).packageName;
if(TextUtils.isEmpty(packageName)){
SkinUtil.getInstance(mContext).saveSkinPath("");
//初始化资源管理
mSkinResource = new SkinResource(mContext,DefaultResourcePath);
return;
}
//校验签名
mSkinResource = new SkinResource(mContext,skinPath);
}
/**
* 加载皮肤
* @param skinPath
* @return
*/
public int loadSkin(String skinPath){
//校验签名
//初始化资源管理
mSkinResource = new SkinResource(mContext,skinPath);
chanageSkin();
saveSkinPath(skinPath);
return 0;
}
/**
* 恢复默认主题
*/
public void restoreDefault(){
String skinPath = SkinUtil.getInstance(mContext).getSkinPath();
if(TextUtils.isEmpty(skinPath)){
return;
}
String DefaultResourcePath = mContext.getPackageResourcePath();
//初始化资源管理
mSkinResource = new SkinResource(mContext,DefaultResourcePath);
chanageSkin();
saveSkinPath("");
}
private void chanageSkin(){
Set>> entries = mSkinViews.entrySet();
for (Map.Entry> entry : entries) {
List values = entry.getValue();
for (SkinView view : values) {
view.skin();
}
IChangeSkinListener listener = entry.getKey();
listener.chanageSkin(mSkinResource);
}
}
/**
* 获取指定Activity的view集合
* @param activity
* @return
*/
public List getSkinViews(Activity activity) {
List skinViews = mSkinViews.get(activity);
return skinViews;
}
/**
* 保存正在使用皮肤路径
* @param skinPath
*/
public void saveSkinPath(String skinPath){
SkinUtil.getInstance(mContext).saveSkinPath(skinPath);
}
public void register(IChangeSkinListener activity, List skinViews) {
mSkinViews.put(activity,skinViews);
}
public void unregister(Activity activity) {
mSkinViews.remove(activity);
}
public SkinResource getSkinResource() {
return mSkinResource;
}
/**
* 检查是否要换肤
* @param skinView
*/
public void checkChangeSkin(SkinView skinView) {
String skinPath = SkinUtil.getInstance(mContext).getSkinPath();
if(!TextUtils.isEmpty(skinPath)){
skinView.skin();
}
}
}
SkinResource
//皮肤资源通过这个对象获取
private Resources mSkinResources=null;
private String mSkinPackageName;
public SkinResource(Context context, String skinPath){
try{
Resources supRes = context.getResources();
AssetManager assetManager = AssetManager.class.newInstance();
Method addAssetPath = AssetManager.class.getDeclaredMethod("addAssetPath",String.class);
addAssetPath.invoke(assetManager,skinPath);
mSkinResources = new Resources(assetManager,supRes.getDisplayMetrics(),supRes.getConfiguration());
mSkinPackageName = context.getPackageManager().getPackageArchiveInfo(skinPath, PackageManager.GET_ACTIVITIES).packageName;
}catch (Exception ex){
ex.printStackTrace();
}
}
/**
* 通过名称获取drawable
* @param name
* @return
*/
public Drawable getDrawableByName(String name){
try {
int resId = mSkinResources.getIdentifier(name, "drawable", mSkinPackageName);
Drawable drawable = mSkinResources.getDrawable(resId);
return drawable;
}catch (Exception ex){
}
return null;
}
/**
* 根据名称获取颜色
* @param name
* @return
*/
public ColorStateList getColorByName(String name){
try {
int resId = mSkinResources.getIdentifier(name, "color", mSkinPackageName);
ColorStateList colorStateList= mSkinResources.getColorStateList(resId);
return colorStateList;
}catch (Exception ex){
Log.e("tag","=====>"+ex);
}
return null;
}
}
基本使用：
public class BaseApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
SkinManager.getInstance().init(this);
}
}
一句话就行了，但是要注意，资源必须使用@drawable @color等
如果有自定义属性，第三方控件，可以实现chanageSkin：
@Override
public void chanageSkin(SkinResource resource) {
super.chanageSkin(resource);
}
更据自己的需求来改写。
知道原理其实也没那么神奇，大家也可以上网看一些第三的库，但是核心原理其实一模一样，也可以自己在这个基础上进行扩展，添加别的一键切换的功能
下载地址：StoneSkinManage-Demo