周末在github上浏览了一个分段选择器的实现，其实就是一个自定义view，写了一个小demo实验了一下，感觉很不错，遂记之！

效果图：

实现很简单，主要是在fragment的填充

布局：

segmentcontrol:texts=”我的好友|同学|同事|老师”。用来设置分段内容。

MainActivity

package com.example.wangchang.segmentcontrol.activity;

import android.support.design.widget.Snackbar;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import com.example.wangchang.segmentcontrol.R;

import com.example.wangchang.segmentcontrol.fragment.BookFragment;

import com.example.wangchang.segmentcontrol.fragment.FavoritesFragment;

import com.example.wangchang.segmentcontrol.fragment.FindFragment;

import com.example.wangchang.segmentcontrol.fragment.LocationFragment;

import com.example.wangchang.segmentcontrol.segmentcontrol.SegmentControl;

public class MainActivity extends AppCompatActivity {

private LocationFragment mLocationFragment;

private FindFragment mFindFragment;

private FavoritesFragment mFavoritesFragment;

private BookFragment mBookFragment;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final SegmentControl show = (SegmentControl) findViewById(R.id.segment_control);

setDefaultFragment();

show.setOnSegmentControlClickListener(new SegmentControl.OnSegmentControlClickListener() {

@Override

public void onSegmentControlClick(int index) {

FragmentManager fm = getSupportFragmentManager();

FragmentTransaction ft = fm.beginTransaction();

switch (index) {

case 0:

if (mLocationFragment == null) {

mLocationFragment = LocationFragment.newInstance("我的好友");

}

ft.replace(R.id.layFragme, mLocationFragment).commitAllowingStateLoss();

Snackbar.make(show, " 好友", Snackbar.LENGTH_SHORT).show();

break;

case 1:

if (mFindFragment == null) {

mFindFragment = FindFragment.newInstance("同学");

}

ft.replace(R.id.layFragme, mFindFragment).commitAllowingStateLoss();

Snackbar.make(show, " 同学", Snackbar.LENGTH_SHORT).show();

break;

case 2:

if (mFavoritesFragment == null) {

mFavoritesFragment = FavoritesFragment.newInstance("同事");

}

ft.replace(R.id.layFragme, mFavoritesFragment).commitAllowingStateLoss();

Snackbar.make(show, " 同事", Snackbar.LENGTH_SHORT).show();

break;

case 3:

if (mBookFragment == null) {

mBookFragment = BookFragment.newInstance("老师");

}

ft.replace(R.id.layFragme, mBookFragment).commitAllowingStateLoss();

Snackbar.make(show, " 老师", Snackbar.LENGTH_SHORT).show();

break;

}

}

});

}

private void setDefaultFragment() {

FragmentManager fm = getSupportFragmentManager();

FragmentTransaction ft = fm.beginTransaction();

if (mLocationFragment == null) {

mLocationFragment = LocationFragment.newInstance("我的好友");

ft.replace(R.id.layFragme, mLocationFragment).commitAllowingStateLoss();

}

}

}

setDefaultFragment()加载默认Fragment，setOnSegmentControlClickListener监听分段选择器的点击事件。然后填充Fragment。

Fragment实例化用Fragment自带的静态工程方法newInstance()，便于传值和调用。

Fragment的实现

package com.example.wangchang.segmentcontrol.fragment;

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;

import com.example.wangchang.segmentcontrol.R;

/** * Created by WangChang on 2016/5/15. */

public class BookFragment extends Fragment {

@Nullable

@Override

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

View view = inflater.inflate(R.layout.fragment_index, container, false);

return view;

}

@Override

public void onActivityCreated(@Nullable Bundle savedInstanceState) {

super.onActivityCreated(savedInstanceState);

TextView tv = (TextView) getActivity().findViewById(R.id.tv);

Bundle bundle = getArguments();

if (bundle != null) {

tv.setText(bundle.getString("ARGS"));

}

}

public static BookFragment newInstance(String content) {

Bundle args = new Bundle();

args.putString("ARGS", content);

BookFragment fragment = new BookFragment();

fragment.setArguments(args);

return fragment;

}

}

这里没什么讲的，主要是静态工厂方法newInstance，和利用setArgument传值。

segmentcontrol代码会在项目中给出，这个demo可以直接用于项目中。