安卓中实现Activity向Fragment传值

来源：互联网发布：lytro illum 软件编辑：程序博客网时间：2024/05/22 17:25

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;
   }
}

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