个人喜欢复杂东西简单化，这里就不做理论性描述，实现这方法当然很多，比如可以使用广播，实现Activity回调再调用Fragment等，这里是直接Activity回调到Fragment


效果流程图

2.实现流程

2.1 单例回调委托代理类，MyInstance.java

packagecom.cyy.test;/***Createdbycyyon2016/6/20.*单例代理接口回调*/publicclassMyInstance{publicstaticMyInstanceinstance;publicCallBackercallBacker;//回调代理publicstaticMyInstancegetInstance(){if(instance==null){instance=newMyInstance();}returninstance;}/***接口设置*/public<T>voidsetCallBacker(CallBacker<T>callBacker){this.callBacker=callBacker;}/***回调接口*/publicinterfaceCallBacker<T>{voidonCallBack(Tvar);}}

2.2 Activity1中设置单例委托类代理的回调方法

packagecom.cyy.test;importandroid.app.Fragment;importandroid.content.Intent;importandroid.os.Bundle;importandroid.view.LayoutInflater;importandroid.view.View;importandroid.view.ViewGroup;importandroid.widget.Button;importandroid.widget.Toast;publicclassMyFragmentextendsFragmentimplementsView.OnClickListener{@OverridepublicViewonCreateView(LayoutInflaterinflater,ViewGroupcontainer,BundlesavedInstanceState){Viewview=inflater.inflate(R.layout.fragment_my,container,false);Buttonbutton=(Button)view.findViewById(R.id.button);button.setOnClickListener(this);returnview;}@OverridepublicvoidonClick(Viewv){switch(v.getId()){caseR.id.button://设置回调代理方法MyInstance.getInstance().setCallBacker(newMyInstance.CallBacker<String>(){@OverridepublicvoidonCallBack(Stringvar){Toast.makeText(mContext,"回调成功"+var,Toast.LENGTH_SHORT).show();}});//点击跳转到到Activity2startActivity(newIntent(getActivity(),Activity2.class));break;}}}


2.3 Activity1中Fragment接口方法定义，打开Actvity2界面并设置回调方法

packagecom.cyy.test;importandroid.app.Activity;importandroid.os.Bundle;importandroid.view.View;importandroid.widget.Button;publicclassActivity2extendsActivityimplementsView.OnClickListener{@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity2);Buttonbutton=(Button)findViewById(R.id.button);button.setOnClickListener(this);}@OverridepublicvoidonClick(Viewv){switch(v.getId()){caseR.id.button://执行回调MyInstance.getInstance().callBacker.onCallBack("来自Activity2回调");finish();break;}}}


3.Demo代码这里不提供了，这三个类直接复制使用就可以