Eventbus框架的使用

说明：这是一个非常好的android组件间消息传递和消息通信的框架，传递数据非常的方便快捷，这里写一个简单的小例子去使用它，我让eventbus实现在两个fragemnt之间的消息传递

1.先看效果图

2.在builder.gradle中，添加依赖

compile 'org.greenrobot:eventbus:3.0.0'

3.创建一个消息类，用于数据处理的

public class StringEvent {
    private String texto;

    public StringEvent(String texto) {
        this.texto = texto;
    }

    public String getTexto() {
        return texto;
    }

    public void setTexto(String texto) {
        this.texto = texto;
    }
}

4.主界面啥也不干，就放置两个fragment就可以了，下面书主界面的layout布局文件

5.大家仔细看上面的布局文件，可以看到有两个fragemnt  这个就是我们的主角，一个接收页面，一个发送页面

先写发送页面 ItemsFragment 

package com.mac.fireflies.wgt.eventbus;


import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;


/**
 * A simple {@link Fragment} subclass.
 */
public class ItemsFragment extends Fragment {


    private Button button;
    private EditText textView;

    public ItemsFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_items, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        button = (Button) view.findViewById(R.id.item_button);
        textView = (EditText) view.findViewById(R.id.item_et);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String res = textView.getText().toString().trim();
                EventBus.getDefault().post(new StringEvent(res));
            }
        });
    }

    @Override
    public void onStart() {
        super.onStart();
        EventBus.getDefault().register(this);
    }

    @Subscribe
    public void ShowTextEventAnswer(StringEvent answer){
    }
}

发送的布局文件,一个书edittext 还有一个书button 因为过于简单，这里不写了，大家参考上面的效果图来写布局

 

6.在写一个接收的fragment

package com.mac.fireflies.wgt.eventbus;


import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;


/**
 * A simple {@link Fragment} subclass.
 */
public class ContentFragment extends Fragment {


    private TextView textView;

    public ContentFragment() {
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_content, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        textView = (TextView) view.findViewById(R.id.content_text);
    }

    @Override
    public void onStart() {
        super.onStart();
        EventBus.getDefault().register(this);
    }

    @Subscribe
    public void showTextEvent(StringEvent stringEvent){
        textView.setText(stringEvent.getTexto());
    }
}

 

运行一下，会发现，string字段消息在两个fragment之间进行传递

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