15 ActionBar.Tab 以及保存fragment对象代码案例

API 21弃用

values 中 string文件源码:

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="app_name">Day15_Actionbar_demo4</string>

    <string name="action_settings">Settings</string>

    <string name="hello_world">Hello world!</string>

    <!--

        nums 对应网址

      -->

    <string-array name="paths">

        <item>http://c.m.163.com/nc/article/headline/T1348647853363/0-20.html</item>

        <item>http://c.m.163.com/nc/article/list/T1348648517839/0-20.html</item>

        <item>http://c.m.163.com/nc/article/list/T1348649079062/0-20.html</item>

        <item>http://c.m.163.com/nc/article/list/T1348648756099/0-20.html</item>

    </string-array>

    <!--由于地址返回json的根目录中只有这个名字 所以写死每个地址的根目录名 就可以只用一个解析了  -->

    <string-array name="nums">

        <item>T1348647853363</item>

        <item>T1348648517839</item>

        <item>T1348649079062</item>

        <item>T1348648756099</item>

    </string-array>

</resources>

activity_main.xml源码:



<!-- 直接作为fragment的容器 -->

<RelativeLayout 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:id="@+id/rl_fragment_id"

    tools:context=".MainActivity" >

</RelativeLayout>

fragment填充对象源码:

<?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" >

    <ListView

        android:id="@+id/lv"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        />

</LinearLayout>

MainActivity.java:

package com.qf.day15_actionbar_demo4;

import java.util.HashMap;

import java.util.Map;

import com.qf.day15_actionbar_demo4.fragment.MyFragment;

import android.os.Bundle;

import android.app.ActionBar;

import android.app.ActionBar.Tab;

import android.app.ActionBar.TabListener;

import android.app.Activity;

import android.app.Fragment;

import android.app.FragmentTransaction;

import android.util.Log;

import android.view.Menu;

import android.widget.Toast;

public class MainActivity extends Activity implements TabListener{

    private Map<Integer, Fragment> fragmentMap;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //将集合实例化

        fragmentMap = new HashMap<Integer, Fragment>();

        //获取ActionBar

        ActionBar actionBar = getActionBar();

        //设置导航模式

        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab tab = actionBar.newTab();

        tab.setIcon(android.R.drawable.ic_menu_add);

        tab.setText("头条");

        tab.setTabListener(this);

        actionBar.addTab(tab, true);

        tab = actionBar.newTab();

        tab.setIcon(android.R.drawable.ic_menu_call);

        tab.setText("娱乐");

        tab.setTabListener(this);

        actionBar.addTab(tab);

        tab = actionBar.newTab();

        tab.setIcon(android.R.drawable.ic_menu_camera);

        tab.setText("财经");

        tab.setTabListener(this);

        actionBar.addTab(tab);

        tab = actionBar.newTab();

        tab.setIcon(android.R.drawable.ic_menu_crop);

        tab.setText("体育");

        tab.setTabListener(this);

        actionBar.addTab(tab);

    }

    /**

     * 选择Tab 事件监听

     */

    @Override

    public void onTabSelected(Tab tab, FragmentTransaction ft) {

        // TODO Auto-generated method stub

        //你点击的是那个Tab 位置获取出来

//      int pos = tab.getPosition();

//

//      MyFragment myFragment = new MyFragment();

//

//      Bundle bundle = new Bundle();

//      bundle.putInt("pos", pos);

//      myFragment.setArguments(bundle);

//

//

//      ft.replace(R.id.rl_fragment_id, myFragment);

//      //.commit();  不需要加提交  不需要 添加回退

        Log.e("AAA", tab.getPosition()+"");

        Fragment fragment = fragmentMap.get(tab.getPosition());

        if(fragment==null){

            fragment = new MyFragment();

            Bundle bundle = new Bundle();

            bundle.putInt("pos", tab.getPosition());

            fragment.setArguments(bundle);

            fragmentMap.put(tab.getPosition(), fragment);

            ft.add(R.id.rl_fragment_id, fragment);

        }else{

            ft.show(fragment);

        }

    }

    /**

     * 重选Tab  双击

     */

    @Override

    public void onTabReselected(Tab tab, FragmentTransaction ft) {

        // TODO Auto-generated method stub

    }

    /**

     * 用户选择另一个tab标签的时候触发

     */

    @Override

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {

        // TODO Auto-generated method stub

        //没有被选择的Tab

        Fragment fragment = fragmentMap.get(tab.getPosition());

        Toast.makeText(this, tab.getPosition()+"", 0).show();

        if(fragment!=null){

            ft.hide(fragment);

        }

    }

}

MyTask.java 一个异步任务用于加载网络数据:

package com.qf.day15_actionbar_demo4.asynctask;

import java.util.List;

import com.qf.day15_actionbar_demo4.interface0.CallBackData;

import com.qf.day15_actionbar_demo4.utils.HttpUtils;

import com.qf.day15_actionbar_demo4.utils.ParseJson;

import android.os.AsyncTask;

public class MyTask extends AsyncTask<String, Void, List<String>>{

    private String num;

    private CallBackData callBackData;

    public MyTask(String num,CallBackData callBackData){

        this.num = num;

        this.callBackData = callBackData;

    }

    @Override

    protected List<String> doInBackground(String... params) {

        // TODO Auto-generated method stub

        String jsonStr = HttpUtils.getStr(params[0]);

        //解析数据

        return ParseJson.getData(num, jsonStr);

    }

    @Override

    protected void onPostExecute(List<String> result) {

        // TODO Auto-generated method stub

        super.onPostExecute(result);

        if(result!=null&&result.size()>0){

            callBackData.sendData(result);

        }

    }

}

Fragment.java :

package com.qf.day15_actionbar_demo4.fragment;

import java.util.List;

import com.qf.day15_actionbar_demo4.R;

import com.qf.day15_actionbar_demo4.asynctask.MyTask;

import com.qf.day15_actionbar_demo4.interface0.CallBackData;

import android.app.Activity;

import android.app.Fragment;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.TextView;

public class MyFragment extends Fragment{

    private ListView lv;

    int pos ;

    private String path,num;//请求地址 和请求数据的解析需要的对象

    @Override

    public void onAttach(Activity activity) {

        // TODO Auto-generated method stub

        super.onAttach(activity);

         pos = getArguments().getInt("pos");

         String[] paths = getResources().getStringArray(R.array.paths);

         String[] nums = getResources().getStringArray(R.array.nums);

         path = paths[pos];

         num = nums[pos];

    }

    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container,

            Bundle savedInstanceState) {

        // TODO Auto-generated method stub

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

        lv = (ListView) view.findViewById(R.id.lv);

        return view;

    }

    @Override

    public void onActivityCreated(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onActivityCreated(savedInstanceState);

        //开启异步任务  请求数据  展示数据

        new MyTask(num, new CallBackData() {

            @Override

            public void sendData(List<String> list) {

                // TODO Auto-generated method stub

                Log.e("AAA", "===path=="+path);

                Log.e("AAA", "===list=="+list.size());

                ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),

                        android.R.layout.simple_list_item_1, list);

                lv.setAdapter(adapter);

            }

        }).execute(path);

    }

    @Override

    public void onHiddenChanged(boolean hidden) {

        super.onHiddenChanged(hidden);

        Log.e("AAA", "==onHiddenChanged==");

    }

}

一个回调接口:

package com.qf.day15_actionbar_demo4.interface0;

import java.util.List;

public interface CallBackData {

    public void sendData(List<String> list);

}

一个网络下载代码:

package com.qf.day15_actionbar_demo4.utils;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

public class HttpUtils {

    public static String getStr(String path) {

        // TODO Auto-generated method stub

        HttpURLConnection connection = null;

        InputStream is  = null;

        try {

            URL url = new URL(path);

             connection= (HttpURLConnection) url.openConnection();

            connection.setRequestMethod("GET");

            connection.setConnectTimeout(5000);

            connection.connect();

            if(connection.getResponseCode()==200)

            {

                 is = connection.getInputStream();

                StringBuilder sBuilder = new StringBuilder();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len=is.read(buffer))!=-1) {

                    sBuilder.append(new String(buffer,0,len));

                }

                return sBuilder.toString();

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }finally

        {

            if(connection!=null)

            {

                connection.disconnect();

            }

            if (is!=null) {

                try {

                    is.close();

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

            }

        }

        return null;

    }

}

解析json数据工具类:

package com.qf.day15_actionbar_demo4.utils;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

public class HttpUtils {

    public static String getStr(String path) {

        // TODO Auto-generated method stub

        HttpURLConnection connection = null;

        InputStream is  = null;

        try {

            URL url = new URL(path);

             connection= (HttpURLConnection) url.openConnection();

            connection.setRequestMethod("GET");

            connection.setConnectTimeout(5000);

            connection.connect();

            if(connection.getResponseCode()==200)

            {

                 is = connection.getInputStream();

                StringBuilder sBuilder = new StringBuilder();

                byte[] buffer = new byte[1024];

                int len = 0;

                while ((len=is.read(buffer))!=-1) {

                    sBuilder.append(new String(buffer,0,len));

                }

                return sBuilder.toString();

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }finally

        {

            if(connection!=null)

            {

                connection.disconnect();

            }

            if (is!=null) {

                try {

                    is.close();

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

            }

        }

        return null;

    }

}

秒客网

15 ActionBar.Tab 以及保存fragment对象代码案例

相关文章

15 ActionBar.Tab 以及保存fragment对象 代码案例

相关文章

15 ActionBar.Tab 以及保存fragment对象代码案例