1. 切换自定义Theme
优点： 实现简单 ，无侵入，易于理解 ,兼容性能好
缺点： 不能实时生效，静态更新，要在setContentView之前切换theme ,
自定义属性 ：
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| <resources>
<attr name="textColor" format="reference|color"/>
<attr name="background" format="reference|color"/>
</resources>
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自定义样式：
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<style name="AppTheme_Light" >
<item name="textColor">@android:color/black</ item>
<item name="android:background">@android:color/white</ item>
</style>
<style name="AppTheme_Night">
<item name="textColor">@android:color/white</ item>
<item name="android:background">@android:color/black</ item>
</style>
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应用：
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| <TextView
android :layout_width="wrap_content"
android :layout_height="wrap_content"
android :text="Hello World!"
android :background="?attr/background"
android :textColor="?attr/textColor"/>
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| protected void skinChange() {
TypedValue background = new TypedValue();
TypedValue textColor = new TypedValue();
Resources.Theme theme = getTheme();
theme.resolveAttribute(R.attr.background, background, true);
theme.resolveAttribute(R.attr.textColor, textColor, true);
mTextView .setTextColor(textColor.data);
mTextView.setBackgroundResource(background.resourceId);
}
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2. 侵入式换肤框架
主要介绍一种侵入式方案的实现
优点： 使用简单，可以动态替换网络上下载的皮肤包
缺点： 侵入式 可能存在兼容性问题
2.1 LayoutInflater加载
首先是view的加载流程
- activity.java
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| public void setContentView(int layoutResID) {
getWindow().setContentView(layoutResID);
}
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- PhoneWindow.java
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@Override
public void setContentView(int layoutResID) {
...
mLayoutInflater.inflate(layoutResID, mContentParent);
...
}
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- LayoutInflater.java
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| public View inflate(int resource, ViewGroup root, boolean attachToRoot) {
...
XmlResourceParser parser = getContext().getResources().getLayout(resource);
try {
return inflate(parser, root, attachToRoot);
} finally {
parser.close();
}
}
public View inflate(XmlPullParser parser, ViewGroup root, boolean attachToRoot) {
...
View temp = createViewFromTag(name, attrs);
...
}
View createViewFromTag(String name, AttributeSet attrs) {
...
View view = (mFactory == null) ? null : mFactory.onCreateView(name,
mContext, attrs);
if (view == null) {
if (-1 == name.indexOf('.')) {
view = onCreateView(name, attrs);
} else {
view = createView(name, null, attrs);
}
}
if (DEBUG) System.out.println("Created view is: " + view);
return view;
...
}
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我们重点看 createViewFromTag ， 经过上面一系列步骤，我们看到了view的创建，首先会通过 mFactory ，
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| public void setFactory(Factory factory)
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通过 设置 factory，我们可以接管view的创建流程
2.2 加载外部资源皮肤包
皮肤包就是一个空的apk文件，只有 drawable，color 等
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Resources skinResource = null;
try {
File file = new File(skinPath);
if(file == null || !file.exists()){
return null;
}
PackageManager mPm = mContext.getPackageManager();
PackageInfo mInfo =mPm.getPackageArchiveInfo(skinPath, PackageManager.GET_ACTIVITIES);
mSkinPackageName = mInfo.packageName;
AssetManager assetManager = AssetManager.class.newInstance();
Method addAssetPath = assetManager.getClass().getMethod("addAssetPath", String.class);
addAssetPath.invoke(assetManager, skinPath);
Resources superRes = mContext.getResources();
skinResource = new Resources(assetManager,superRes.getDisplayMetrics(),superRes.getConfiguration());
} catch (Exception e) {
e.printStackTrace();
}
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代码托管： https://github.com/kongxs/PluginProject
