Android的Fragment中的互相通信-桥梁activity

效果图如下:

项目结构图如下:

Fragment1:

package com.demo.fragmenttongxin;

import android.app.Activity;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

public class Fragment1 extends Fragment {

    @Override

    public View onCreateView(LayoutInflater inflater,  ViewGroup container, Bundle savedInstanceState) {

        final View view = inflater.inflate(R.layout.fragment1, null);

        //找到按钮

        Button updBtn = view.findViewById(R.id.btn_update);

        updBtn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Fragment2 fragment2 = (Fragment2) getActivity().getFragmentManager().findFragmentByTag("f2");

                //修改2

                fragment2.updateText("修改了哦");

            }

        });

        return view;

    }

}

Fragment2:

package com.demo.fragmenttongxin;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

public class Fragment2 extends Fragment {

    TextView tv_content;

    @Override

    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment2, null);

        //找到tv

         tv_content = view.findViewById(R.id.tv_content);

        return view;

    }

    //修改textView的内容

    public  void updateText(String content){

        tv_content.setText(content);

    }

}

MainActivity:

package com.demo.fragmenttongxin;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //获取fragment管理者

        FragmentManager fragmentManager = getFragmentManager();

        //2.开启一个事务

        FragmentTransaction beginTransaction = fragmentManager.beginTransaction();

        beginTransaction.replace(

                R.id.ll1,new Fragment1(),"f1"

        );

        beginTransaction.replace(

                R.id.ll2,new Fragment2(),"f2"

        );

        //3.开启事务

        beginTransaction.commit();

    }

}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal"

    tools:context=".MainActivity">

 <LinearLayout

     android:id="@+id/ll1"

     android:layout_width="0dp"

     android:layout_weight="1"

     android:layout_height="match_parent">

 </LinearLayout>

 <LinearLayout

     android:id="@+id/ll2"

     android:layout_width="0dp"

     android:layout_weight="1"

     android:layout_height="match_parent">

 </LinearLayout>

</LinearLayout>

fragment1.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    >

    <Button

        android:id="@+id/btn_update"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="修改"

        />

</LinearLayout>

fragment2.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

<TextView

    android:id="@+id/tv_content"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:text="hello world !"

    />

</LinearLayout>

巴特西

Android的Fragment中的互相通信-桥梁activity

效果图如下:

项目结构图如下:

最新文章

热门文章