Activity与fragment之间的传值：fragment的setArguments()和getArguments()

当Activity类动态加载fragment时可以通过fragment的setArguments()传入值，并在fragment类中通过fragment的getArguments()方法获得传入的值；
下面演示一下代码：

MainActivity.java:

主要步骤（该步骤必须在fragmentTransaction.commit()之前完成）：
1.创建一个fragment实例
2.创建一个Bundle 对象（其为键值对存储，可以理解为一个Map）：  Bundle bundle = new Bundle();
3.向bundle中传值：bundle.putString("str","这是MainActivity传来的值~");
4.将bundle通过setArguments(bundle)方法设置进fragment01：fragment01.setArguments(bundle);

package activity.wyc.com.fragmentdemo0305;

import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;

import com.vrinux.fragment.Fragment01;


public class MainActivity extends ActionBarActivity {

    private FragmentManager fragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Fragment01 fragment01 = new Fragment01();
        Bundle bundle = new Bundle();
        bundle.putString("str","这是MainActivity传来的值~");
        fragment01.setArguments(bundle);

        fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction =fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.fm01id,fragment01);
        fragmentTransaction.commit();
    }
}

Fragment01.java:

获取传来的值：
String str = (String)getArguments().get(“str”);

package com.vrinux.fragment;

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

import activity.wyc.com.fragmentdemo0305.R;

/**
 * Created by yc on 2015/3/5.
 */
public class Fragment01 extends Fragment {

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

        View view = inflater.inflate(R.layout.fragment01layout, null);
        TextView tvObj = (TextView)view.findViewById(R.id.fm01tvid);

        String str = (String)getArguments().get("str");

        tvObj.setText(str);

        return view;
    }
}

activity_main.xml：

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/fm01id">FrameLayout>

LinearLayout>

fragment01layout.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:id="@+id/fm01tvid"/>


LinearLayout>