模块化是基于BaseLibrary开发，日常开发是个app，打包时是个Library;这样便于日常开发时编译快，且可以快速把模块化放入其它apk；限制就是只能有主App向各种业务模块Library跳转，这也是为什么模块化的前提，需要在熟悉业务的情况模块化；如果各种页面之间随便跳也会让模块化失去意义
本篇需要的知识点是注解、动态代理 、隐式跳转等知识
1、首先在BaseLibrary定义跳转的路由注解
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface FullUrl {
String value();
}
2、在BaseLibrary定义跳转的参数注解
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface IntentExtrasParam {
String value();
}
3、在BaseLibrary定义动态代理
public class Router {
private Context context;
private static final String TAG = "Router";
public Router(Context context) {
this.context = context;
}
@SuppressWarnings("unchecked")
public <T> T create(Class<T> service){
return (T) Proxy.newProxyInstance(service.getClassLoader(), new Class[]{service}, new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
StringBuilder builder = new StringBuilder();
FullUrl fullUrl = method.getAnnotation(FullUrl.class);
if(fullUrl instanceof FullUrl){
builder.append(fullUrl.value()).append("?");
}else {
throw new IllegalArgumentException("");
}
Annotation[][] parameterAnnotations = method.getParameterAnnotations();
HashMap<String, Object> serializedParams = new HashMap<>();
for (int i=0;i<parameterAnnotations.length;i++){
Annotation[] parameterAnnotation = parameterAnnotations[i];
if (parameterAnnotation == null || parameterAnnotation.length == 0)
break;
Annotation annotation = parameterAnnotation[0];
if(annotation instanceof IntentExtrasParam){
IntentExtrasParam intentExtrasParam= (IntentExtrasParam) annotation;
serializedParams.put(intentExtrasParam.value(),args[i]);
}
}
performJump(builder.toString(),serializedParams);
return null;
}
});
}
private void performJump(String routerUri, HashMap<String, Object> serializedParams) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(routerUri));
Log.e(TAG, "performJump: "+ Uri.parse(routerUri));
Bundle bundle = new Bundle();
for (Map.Entry<String,Object> entry:serializedParams.entrySet()){
String key = entry.getKey();
Object value = entry.getValue();
//可以根据自己的项目需求自由扩展支持数据类型，这里只提供了String和Parcelable类型
if(value instanceof String){
bundle.putString(key,(String) value);
Log.e(TAG, "string: "+(String) value);
}else if(value instanceof Parcelable){
bundle.putParcelable(key, (Parcelable) value);
Log.e(TAG, "Parcelable: "+(Parcelable) value);
}else {
throw new IllegalArgumentException("不支持的数据类型");
}
}
intent.putExtras(bundle);
Log.e(TAG, "performJump: "+intent);
PackageManager packageManager = context.getPackageManager();
List<ResolveInfo> activities = packageManager.queryIntentActivities(intent, 0);
if (!activities.isEmpty()) {
context.startActivity(intent);
}
}
}
4、在业务模块的Library内定义接口;需要注意的是，由App模块跳转到业务模块的页面定义的路由接口放到业务模块内，这样便于管理业务模块的路由页面，这也是为什么不使用显示跳转或者隐式跳转的原因，便于管理路由页面
public interface RouterService {
@FullUrl("router://com.xiaoma.mylibrary.libraryactivity")
void startLibraryActivity(@IntentExtrasParam("stringParam") String stringParam,
@IntentExtrasParam("user") User user);
}
其中User类如下,其中get/set相关方法和Parcelabel未写出来
public class User implements Parcelable {
private String name;
private int age;
}
5、业务模块路由页面的清单文件定义如下
<activity android:name="com.xiaoma.mylibrary.LibraryActivity">
<intent-filter>
<category android:name="android.intent.category.DEFAULT" />
<action android:name="android.intent.action.VIEW" />
<data
android:host="com.xiaoma.mylibrary.libraryactivity"
android:scheme="router" />
</intent-filter>
</activity>
6、在主App内，跳转到模块化页面代码
RouterService routerService = new Router(this).create(RouterService.class);
User user = new User("张三", 30);
routerService.startLibraryActivity("xiaoma", user);
7、从主App跳转到模块化页面获取数据的代码如下:
String stringParam = getIntent().getStringExtra("stringParam");
User user = getIntent().getParcelableExtra("user");
文章参考
Android 模块化探索与实践
