重复创建fragment的解决办法

直接上代码：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private FrameLayout mFrameLayout;
    private Button btn_pan;
    private Button btn_twopan;
    private Button btn_sanpan;
    private Button btn_sipan;
    private List mFragments = new ArrayList<>();
    private PanFragment panFragment;
    private TwoPanFragment twoPanFragment;
    private SanFragment sanPanFragment;
    private SiPanFragment siPanFragment;
    Fragment currentFragment = new Fragment();
    private int currentPostion;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initListener();
        panFragment = new PanFragment();
        twoPanFragment = new TwoPanFragment();
        sanPanFragment = new SanFragment();
        siPanFragment = new SiPanFragment();
        mFragments.add(panFragment);
        mFragments.add(twoPanFragment);
        mFragments.add(sanPanFragment);
        mFragments.add(siPanFragment);

        setLayout();
    }

    private void initListener() {
        btn_pan.setOnClickListener(this);
        btn_twopan.setOnClickListener(this);
        btn_sanpan.setOnClickListener(this);
        btn_sipan.setOnClickListener(this);
    }

    private void initView() {
        mFrameLayout = (FrameLayout) findViewById(R.id.fl_fragment);
        btn_pan = (Button) findViewById(R.id.btn_pan);
        btn_twopan = (Button) findViewById(R.id.btn_twopan);
        btn_sanpan = (Button) findViewById(R.id.btn_sanpan);
        btn_sipan = (Button) findViewById(R.id.btn_sipan);
    }
//主要方法
    private void setLayout() {
        FragmentManager manger = getSupportFragmentManager();
        FragmentTransaction transaction = manger.beginTransaction();
        if (!mFragments.get(currentPostion).isAdded()) {
            transaction.hide(currentFragment).add(R.id.fl_fragment, mFragments.get(currentPostion));

        } else {
            transaction.hide(currentFragment).show(mFragments.get(currentPostion));

        }
        currentFragment = mFragments.get(currentPostion);
        transaction.commit();
    }
//
    private void setLayout1(Fragment from, Fragment to) {
        if (from != to) {
            FragmentManager manger = getSupportFragmentManager();
            FragmentTransaction transaction = manger.beginTransaction();
            if (!to.isAdded()) {
                if (from != null) {
                    transaction.hide(from);
                }
                if (to != null) {
                    transaction.add(R.id.fl_fragment, to).commit();
                }

            } else {
                if (from != null) {
                    transaction.hide(from);
                }
                if (to != null) {
                    transaction.show(to).commit();
                }

            }
        }

    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_pan:
                currentPostion = 0;

                break;
            case R.id.btn_twopan:
                currentPostion = 1;

                break;
            case R.id.btn_sanpan:
                currentPostion = 2;

                break;
            case R.id.btn_sipan:
                currentPostion = 3;

                break;

        }
        setLayout();
    }
}

结果：

07-11 07:57:56.996 10077-10077/com.jetway.fenping D/SiPanFragment: onCreateView: 
07-11 07:57:58.660 10077-10077/com.jetway.fenping D/SanFragment: onCreateView: 
07-11 07:57:59.860 10077-10077/com.jetway.fenping D/TwoPanFragment: onCreateView: （日志没有重复创建）