Tab系列02PagerAdapter+Fragment

package com.example.tabdemo01;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends FragmentActivity {
    TextView tv_header;
    FragmentManager fmManager ;
    Fragment fm1;
    Fragment fm2;
    Fragment fm3;
    Fragment fm4;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        //将所有的Fragment 隐藏
        onweixin(null);
    }

    public void initView() {
        tv_header = (TextView) findViewById(R.id.tv_headr);
        fmManager =  getSupportFragmentManager();

    }
    public void onweixin(View view){    
        tv_header.setText("微信");
    }
    public void onFriend(View view){
        tv_header.setText("好友");
    }
    public void onContacts(View view){
        tv_header.setText("联系人");

    }
    public void onMyself(View view){
        tv_header.setText("我的");


    }


    public void selectionTab(int index) {
        FragmentTransaction  ft = fmManager.beginTransaction();
        //将所有的Fragment 隐藏
        hideFragments(ft, fm1, fm2, fm3, fm4);
        switch (index) {
        case 0:
            if(fm1 == null){
                fm1 = new Fragment01();
                ft.add(R.id.id_content, fm1);
            }else {
                ft.show(fm1);
            }
            break;
        case 1:
            if(fm2 == null){
                fm2 = new Fragment02();
                ft.add(R.id.id_content, fm2);
            }else {
                ft.show(fm2);
            }
            break;
        case 2:
            if(fm3 == null){
                fm3 = new Fragment03();
                ft.add(R.id.id_content, fm3);
            }else {
                ft.show(fm3);
            }
            break;
        case 3:
            if(fm4 == null){
                fm4 = new Fragment04();
                ft.add(R.id.id_content, fm4);
            }else {
                ft.show(fm4);
            }
            break;
        default:
            break;
        }
        ft.commit();
    }


    /**
     * 将制定fragment 隐藏Fragment
     * @param fragment
     */
    public void hideFragments(FragmentTransaction ft, Fragment...fragment){
        for (Fragment fragment2 : fragment) {
            if(fragment2 != null){
                ft.hide(fragment2);
            }
        }
    }


}

package com.example.tabdemo01;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends FragmentActivity {
    TextView tv_header;
    FragmentManager fmManager ;
    FragmentTransaction ft;
    Fragment fm1;
    Fragment fm2;
    Fragment fm3;
    Fragment fm4;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        //将所有的Fragment 隐藏
        hideFragments(fm1, fm2, fm3, fm4);
    }

    public void initView() {
        tv_header = (TextView) findViewById(R.id.tv_headr);
        fmManager =  getSupportFragmentManager();
    /*    fm1 = new Fragment01();
        fm2 = new Fragment02();
        fm3 = new Fragment03();
        fm4 = new Fragment04();*/

        ft = fmManager.beginTransaction();






    }
    public void onweixin(View view){    
        tv_header.setText("微信");
        //将所有的Fragment 隐藏
        hideFragments(fm1, fm2, fm3, fm4);
        if(fm1 == null){
            fm1 = new Fragment01();
            ft.add(R.id.id_content, fm1);
        }else {
            ft.show(fm1);
        }
        ft.commit();
    }
    public void onFriend(View view){
        //将所有的Fragment 隐藏
        hideFragments(fm1, fm2, fm3, fm4);
        if(fm2 == null){
            fm2 = new Fragment02();
            ft.add(R.id.id_content, fm2);
        }else {
            ft.show(fm2);
        }
        tv_header.setText("好友");
        ft.commit();
    }
    public void onContacts(View view){
        //将所有的Fragment 隐藏
        hideFragments(fm1, fm2, fm3, fm4);
        tv_header.setText("联系人");
        if(fm3 == null){
            fm3 = new Fragment03();
            ft.add(R.id.id_content, fm3);
        }else {
            ft.show(fm3);
        }
        ft.commit();
    }
    public void onMyself(View view){
        //将所有的Fragment 隐藏
        hideFragments(fm1, fm2, fm3, fm4);
        tv_header.setText("我的");
        if(fm4 == null){
            fm4 = new Fragment04();
            ft.add(R.id.id_content, fm4);
        }else {
            ft.show(fm4);
        }
        ft.commit();

    }

    public void setTabSelection(int index, Fragment fm){
        //将所有的Fragment 隐藏
        hideFragments(fm1, fm2, fm3, fm4);
     
    }
    /**
     * 将制定fragment 隐藏Fragment
     * @param fragment
     */
    public void hideFragments(Fragment...fragment ){
        for (Fragment fragment2 : fragment) {
            if(fragment2 != null){
                ft.hide(fragment2);
            }
        }
    }


}