BasePresenter 基類

package com.test.mvp.mvpdemo.mvp.v4.basemvp;

import android.util.Log;

import java.lang.ref.SoftReference;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;

public abstract class BasePresenter<V extends IBaseView, M extends BaseModel> implements IBasePresenter {
private SoftReference<IBaseView> mReferenceView;
private V mProxyView;
private M mModel;

@SuppressWarnings({"unchecked", "TryWithIdenticalCatches"})
@Override
public void attach(IBaseView view) {
//使用軟引用創建對象
mReferenceView = new SoftReference<>(view);
//使用動態代理做統一的邏輯判斷 aop 思想
mProxyView = (V) Proxy.newProxyInstance(view.getClass().getClassLoader(), view.getClass().getInterfaces(), new InvocationHandler() {
@Override
public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
if (mReferenceView == null || mReferenceView.get() == null) {
return null;
}
return method.invoke(mReferenceView.get(), objects);
}
});

//通過獲得泛型類的父類，拿到泛型的接口類實例，通過反射來實例化 model
ParameterizedType type = (ParameterizedType) this.getClass().getGenericSuperclass();
if (type != null) {
Type[] types = type.getActualTypeArguments();
try {
mModel = (M) ((Class<?>) types[1]).newInstance();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
}
}

}

@SuppressWarnings("unchecked")
public V getView() {
return mProxyView;
}

protected M getModel() {
return mModel;
}

@Override
public void detach() {
mReferenceView.clear();
mReferenceView = null;
}
}
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