安卓中实现Activity向Fragment传值

1.写主布局文件，有一个输入框，发送按钮，用来放Fragment的LinearLayout

<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="vertical">

<EditText

android:id="@+id/text"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textColor="#00ff00"/>

<Button

android:id="@+id/send"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:onClick="click"

android:text="发送"/>

<LinearLayout

android:id="@+id/myfra"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal">

</LinearLayout>

</LinearLayout>

2.主逻辑代码文件中：发送数据

package com.day12_activitytofragment;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity {

EditText text;

Button send;

··// FragmentManager管理对象

FragmentManager fm;

@SuppressLint("NewApi") @Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

text=(EditText) findViewById(R.id.text);

send=(Button) findViewById(R.id.send);

fm=getFragmentManager();

//得到事务

FragmentTransaction shiwu = fm.beginTransaction();

//将MyFragment()放到LinearLayout并加到事务中

shiwu.add(R.id.myfra,new MyFragment());

//提交事务

shiwu.commit();

}

@SuppressLint("NewApi")

public void click(View v)

{

//获取输入的内容

String content = text.getText().toString();

//创建一个Bundle并将要发送的数据放进去

Bundle bundle=new Bundle();

bundle.putString("mes", content);

MyFragment mf=new MyFragment();

//将bundle绑定到MyFragment的对象上

mf.setArguments(bundle);

FragmentTransaction shiwu =fm.beginTransaction();

shiwu.replace(R.id.myfra, mf);

shiwu.commit();

}

}

3.创建一个布局文件fragement.xml,TextView控件用来接收Activity传过来的值

<?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"

android:background="#ff0000">

<TextView

android:id="@+id/tv"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:textColor="#0000ff"

android:textSize="30sp"/>

</LinearLayout>

4.创建一个.java文件Fragment1.java,并将fragment.xml布局文件加载进去和接收数据

package com.day12_activitytofragment;

import android.annotation.SuppressLint;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

@SuppressLint("NewApi")

public class MyFragment extends Fragment{

TextView tv;

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View view=inflater.inflate(R.layout.myfragment,container,false);

tv=(TextView) view.findViewById(R.id.tv);

//接收数据

Bundle bundle=getArguments();

if(bundle!=null)

{

String data = bundle.getString("mes");

tv.setText(data);

}

return view;

}

}