Activity向Fragment中传值

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activity向fragment中传值   
1。要传的值  放到Bundle对象里

2。通过创建传递封Fragment 将bundle对象 通过 setArguments（）传递到fragment

3.Fragment中 通过getArguments() 得到 bundle对象  就能得到里面的值

代码：

MainActivity:

package com.qianfeng.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.EditText;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

    private EditText et1;
    private FragmentManager manager;
    private FragmentTransaction transaction;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        et1 = (EditText) findViewById(R.id.et1);

        manager = getFragmentManager();
        transaction = manager.beginTransaction();

        transaction.add(R.id.contents, new Fragment1());
        transaction.commit();

    }

    //点击按钮时  进行传值
    public void onclickBtn(View v){
        switch (v.getId()) {
        case R.id.button1:
            Fragment1 fragment1 = new Fragment1();
            Bundle bundle = new Bundle();
            String strValue = et1.getText().toString().trim();
            bundle.putString("str", strValue);
            fragment1.setArguments(bundle);
            //如果transaction  commit（）过  那么我们要重新得到transaction
            transaction = manager.beginTransaction();
            transaction.replace(R.id.contents, fragment1);
            transaction.commit();
            break;

        default:
            break;
        }
    }



}

package com.qianfeng.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.EditText;

@SuppressLint("NewApi") 
public class MainActivity extends Activity {

	private EditText et1;
	private FragmentManager manager;
	private FragmentTransaction transaction;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        et1 = (EditText) findViewById(R.id.et1);
        
        manager = getFragmentManager();
        transaction = manager.beginTransaction();
        
        transaction.add(R.id.contents, new Fragment1());
        transaction.commit();
        
    }
    
    //点击按钮时  进行传值
    public void onclickBtn(View v){
    	switch (v.getId()) {
		case R.id.button1:
			Fragment1 fragment1 = new Fragment1();
			Bundle bundle = new Bundle();
			String strValue = et1.getText().toString().trim();
			bundle.putString("str", strValue);
			fragment1.setArguments(bundle);
			//如果transaction  commit（）过  那么我们要重新得到transaction
			transaction = manager.beginTransaction();
			transaction.replace(R.id.contents, fragment1);
			transaction.commit();
			break;

		default:
			break;
		}
    }
    
    
    
}

Fragment :

package com.qianfeng.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 Fragment1 extends  Fragment{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View view = inflater.inflate(R.layout.fragment_layout1, container, false);
        TextView textView1 = (TextView) view.findViewById(R.id.textView1);
        Bundle bundle = getArguments();//从activity传过来的Bundle
        if(bundle!=null){
            textView1.setText(bundle.getString("str"));
        }

        return view;
    }
}

package com.qianfeng.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 Fragment1 extends  Fragment{
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		View view = inflater.inflate(R.layout.fragment_layout1, container, false);
		TextView textView1 = (TextView) view.findViewById(R.id.textView1);
		Bundle bundle = getArguments();//从activity传过来的Bundle
		if(bundle!=null){
			textView1.setText(bundle.getString("str"));
		}
		
		return view;
	}
}