BaseActivity 代码

package com.test.mvp.mvpdemo.mvp.v5.basemvp;

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.IdRes;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

import com.test.mvp.mvpdemo.mvp.v5.inject.InjectPresenter;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

public abstract class BaseActivity<P extends IBasePresenter> extends AppCompatActivity implements IBaseView {

private P mPresenter;

/**
* 保存使用注解的 Presenter ，用于解绑
*/
private List<BasePresenter> mInjectPresenters;

protected abstract void initLayout(@Nullable Bundle savedInstanceState);

protected abstract P setPresenter();

protected abstract void initViews();

protected abstract void initData();


@SuppressWarnings("SameParameterValue")
protected <T extends View> T $(@IdRes int viewId) {
return findViewById(viewId);
}

@SuppressWarnings({"unchecked", "TryWithIdenticalCatches"})
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

initLayout(savedInstanceState);

/**
* 实例化和绑定 P 层
*/
this.mPresenter = setPresenter();
if (mPresenter != null) {
this.mPresenter.attach(this);
}

mInjectPresenters = new ArrayList<>();

//获得已经申明的变量，包括私有的
Field[] fields = this.getClass().getDeclaredFields();
for (Field field : fields) {
//获取变量上面的注解类型
InjectPresenter injectPresenter = field.getAnnotation(InjectPresenter.class);
if (injectPresenter != null) {
try {
Class<? extends BasePresenter> type = (Class<? extends BasePresenter>) field.getType();
BasePresenter mInjectPresenter = type.newInstance();
mInjectPresenter.attach(this);
field.setAccessible(true);
field.set(this, mInjectPresenter);
mInjectPresenters.add(mInjectPresenter);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
}catch (ClassCastException e){
e.printStackTrace();
throw new RuntimeException("SubClass must extends Class:BasePresenter");
}
}
}

initViews();
initData();
}

@Override
protected void onDestroy() {
super.onDestroy();
/**
* 解绑，避免内存泄漏
*/
this.mPresenter.detach();
this.mPresenter = null;
for (BasePresenter presenter : mInjectPresenters) {
presenter.detach();
}
mInjectPresenters.clear();
mInjectPresenters = null;
}

@Override
public Context getContext() {
return this;
}

public P getPresenter(http://www.my516.com) {
return mPresenter;
}
}
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