(Fragment2) activity.myViewPageAdapter.getItem(1)獲取例項實現傳至。

1.adapter

package com.example.shibo.testviewpagefragment;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.view.View;

import java.util.List;

/**
 * Created by shibo on 2017/3/21.
 */

public class MyViewPageAdapter extends FragmentPagerAdapter{
    List<Fragment> mList;
    FragmentManager mManger;

    public MyViewPageAdapter(FragmentManager fm, List<Fragment> mList) {
        super(fm);
        this.mList = mList;

    }

    @Override
    public int getCount() {
        if(mList.size()<=0){
            return 0;
        }
        return mList.size();
    }

    @Override
    public Fragment getItem(int position) {
        return mList.get(position);
    }


}
 

2.activity

package com.example.shibo.testviewpagefragment;

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends FragmentActivity {
  ViewPager viewpage;
    /*
    第一public的adapter，使fragment1也可以拿到
     */
    public MyViewPageAdapter myViewPageAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewpage= (ViewPager) findViewById(R.id.viewpage);
        FragmentManager manager=getSupportFragmentManager();
        Fragment1 fragment1=new Fragment1();
        Fragment2 fragment2=new Fragment2();
        List mList=new ArrayList();
        mList.add(fragment1);
        mList.add(fragment2);
        myViewPageAdapter=new MyViewPageAdapter(manager,mList);
        viewpage.setAdapter(myViewPageAdapter);
        /**
         * button 傳至到fragment2
         */
        Button button= (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Fragment2 fragment21= (Fragment2) myViewPageAdapter.getItem(1);
                fragment21.showMessageFromActivity("我是activity傳遞過來的資料");
            }
        });
    }
}
 

package com.example.shibo.testviewpagefragment;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

/**
 * Created by shibo on 2017/3/21.
 */

public class Fragment1 extends Fragment{
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.fragment1,null);
        Button button= (Button) view.findViewById(R.id.button);
        /*
        拿到adapter實現傳至
         */
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MainActivity activity= (MainActivity) getActivity();
              Fragment2 fragment2= (Fragment2) activity.myViewPageAdapter.getItem(1);
                fragment2.showMessageFromActivity("從fragment1傳遞過來的資料");
            }
        });
        return view;
    }
}
 

package com.example.shibo.testviewpagefragment;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Created by shibo on 2017/3/21.
 */

public class Fragment2 extends Fragment{
    TextView text;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.fragment2,null);
         text= (TextView) view.findViewById(R.id.text);

        return view;
    }
    public void showMessageFromActivity(String message){
        text.setText(message);
    }
}