android--fragment的使用

1通过FragmentAdapter适配器实现

1  主框架布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <FrameLayout        android:id="@+id/flMain"        android:layout_width="match_parent"        android:layout_height="@dimen/weight_setting"        android:layout_weight="1"        android:background="#00ff00">    </FrameLayout>    <RadioGroup        android:id="@+id/rdgMain"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <RadioButton            android:id="@+id/rbtFirst"            android:layout_width="@dimen/weight_setting"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:text="首页" />        <RadioButton            android:id="@+id/rbtShop"            android:layout_width="@dimen/weight_setting"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:text="商家" />        <RadioButton            android:id="@+id/rbtMy"            android:layout_width="@dimen/weight_setting"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:text="我的" />        <RadioButton            android:id="@+id/rbtMore"            android:layout_width="@dimen/weight_setting"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:text="更多" />    </RadioGroup></LinearLayout>

2 四个碎片的布局

2.1

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="首页"/></LinearLayout>

2.2

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="商家"/></LinearLayout>

2.3

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="我的"/></LinearLayout>

2.4

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="更多"/></LinearLayout>

3 java文件

3.1主框架

package com.example.joshua.meituan.activity;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.FrameLayout;import android.widget.RadioGroup;import com.example.joshua.meituan.R;import com.example.joshua.meituan.adapter.MyFragmentAdapter;import com.example.joshua.meituan.fragment.FirstFragment;import com.example.joshua.meituan.fragment.MoreFragment;import com.example.joshua.meituan.fragment.MyFragment;import com.example.joshua.meituan.fragment.ShopFragment;import com.example.joshua.meituan.utils.LogUtils;import java.util.ArrayList;import java.util.List;public class MainActivity extends FragmentActivity implements RadioGroup.OnCheckedChangeListener {    FrameLayout flMain;    RadioGroup rdgMain;    //碎片管理    FragmentManager fragmentManager;    MyFragmentAdapter myFragmentAdapter;    int fragmentIndex = 0;    List<Fragment> fragmentDatas;    FirstFragment firstFragment;    ShopFragment shopFragment;    MyFragment myFragment;    MoreFragment moreFragment;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();        initOnClickListener();    }    private void initOnClickListener() {        rdgMain.setOnCheckedChangeListener(this);    }    private void init() {        flMain= (FrameLayout) findViewById(R.id.flMain);        rdgMain= (RadioGroup) findViewById(R.id.rdgMain);        fragmentDatas = new ArrayList<>();        firstFragment = new FirstFragment();        shopFragment = new ShopFragment();        myFragment = new MyFragment();        moreFragment = new MoreFragment();        fragmentDatas.add(firstFragment);        fragmentDatas.add(shopFragment);        fragmentDatas.add(myFragment);        fragmentDatas.add(moreFragment);        fragmentManager = getSupportFragmentManager();        myFragmentAdapter = new MyFragmentAdapter(fragmentManager, fragmentDatas);    }    @Override    public void onCheckedChanged(RadioGroup radioGroup, int i) {        switch (i) {            case R.id.rbtFirst:                fragmentIndex = 0;                LogUtils.getLogInfo(this, fragmentIndex + "");                break;            case R.id.rbtShop:                fragmentIndex = 1;                LogUtils.getLogInfo(this, fragmentIndex + "");                break;            case R.id.rbtMy:                fragmentIndex = 2;                LogUtils.getLogInfo(this, fragmentIndex + "");                break;            case R.id.rbtMore:                fragmentIndex = 3;                LogUtils.getLogInfo(this, fragmentIndex + "");                break;        }       Fragment fragment = (Fragment) myFragmentAdapter.instantiateItem(flMain,fragmentIndex);        myFragmentAdapter.setPrimaryItem(flMain,fragmentIndex,fragment);        myFragmentAdapter.finishUpdate(flMain);    }}

3.2碎片1

package com.example.joshua.meituan.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 com.example.joshua.meituan.R;import com.example.joshua.meituan.utils.LogUtils;/** * Created by joshua on 2016/6/1. */public class FirstFragment extends Fragment {    View view;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = inflater.inflate(R.layout.fragment_first, container, false);        return view;    }    @Override    public void onDestroy() {        super.onDestroy();        LogUtils.getLogError(getActivity(),"FirstFragment");    }    @Override    public void setMenuVisibility(boolean menuVisible) {        super.setMenuVisibility(menuVisible);        if (this.getView() != null)            this.getView().setVisibility(menuVisible ? View.VISIBLE : View.GONE);    }}

3.3碎片2

package com.example.joshua.meituan.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 com.example.joshua.meituan.R;import com.example.joshua.meituan.utils.LogUtils;/** * Created by joshua on 2016/6/1. */public class ShopFragment extends Fragment {    View view;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = inflater.inflate(R.layout.fragment_shop, container, false);        return view;    }    @Override    public void onDestroy() {        super.onDestroy();        LogUtils.getLogError(getActivity(),"ShopFragment");    }    @Override    public void setMenuVisibility(boolean menuVisible) {        super.setMenuVisibility(menuVisible);        if (this.getView() != null)            this.getView().setVisibility(menuVisible ? View.VISIBLE : View.GONE);    }}

3.4碎片3

package com.example.joshua.meituan.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 com.example.joshua.meituan.R;import com.example.joshua.meituan.utils.LogUtils;/** * Created by joshua on 2016/6/1. */public class MyFragment extends Fragment {    View view;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = inflater.inflate(R.layout.fragment_my, container, false);        return view;    }    @Override    public void onDestroy() {        super.onDestroy();        LogUtils.getLogError(getActivity(),"MyFragment");    }    @Override    public void setMenuVisibility(boolean menuVisible) {        super.setMenuVisibility(menuVisible);        if (this.getView() != null)            this.getView().setVisibility(menuVisible ? View.VISIBLE : View.GONE);    }}

3.5碎片4

package com.example.joshua.meituan.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 com.example.joshua.meituan.R;import com.example.joshua.meituan.utils.LogUtils;/** * Created by joshua on 2016/6/1. */public class ShopFragment extends Fragment {    View view;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = inflater.inflate(R.layout.fragment_shop, container, false);        return view;    }    @Override    public void onDestroy() {        super.onDestroy();        LogUtils.getLogError(getActivity(),"ShopFragment");    }    @Override    public void setMenuVisibility(boolean menuVisible) {        super.setMenuVisibility(menuVisible);        if (this.getView() != null)            this.getView().setVisibility(menuVisible ? View.VISIBLE : View.GONE);    }}

4适配器

package com.example.joshua.meituan.adapter;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import java.util.List;/** * Created by joshua on 2016/6/2. */public class MyFragmentAdapter extends FragmentPagerAdapter {    List<Fragment> datas;    public MyFragmentAdapter(FragmentManager fm, List<Fragment> datas) {        super(fm);        this.datas=datas;    }    @Override    public Fragment getItem(int position) {        return datas.get(position);    }    @Override    public int getCount() {        return datas.size();    }}