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我正在尝试将我的所有代码从活动转换为片段，以便使用导航抽屉并最终使用一些滑动选项卡。

目前我有一个半工作的导航抽屉，可以打开并显示一个列表。但是我对片段很陌生并且很困惑，因为每次我关闭导航抽屉并且不选择任何东西时它似乎都会重新加载我的第一个片段。

MainDrawer.java：

package com.beerportfolio.beerportfoliopro;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Created by Mike on 1/3/14.
 */
public class MainDraw extends FragmentActivity {
    final String[] data ={"Statistics","two","three"};
    final String[] fragments ={
            "com.beerportfolio.beerportfoliopro.StatisticsPage",
            "com.beerportfolio.beerportfoliopro.FragmentTwo",
            "com.beerportfolio.beerportfoliopro.FragmentThree"};
    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        //todo: load statistics fragment

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActionBar().getThemedContext(), android.R.layout.simple_list_item_1, data);

        final DrawerLayout drawer = (DrawerLayout)findViewById(R.id.drawer_layout);


        final ListView navList = (ListView) findViewById(R.id.drawer);
        navList.setAdapter(adapter);

        navList.setOnItemClickListener(new AdapterView.OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> parent, View view, final int pos,long id){
                drawer.setDrawerListener( new DrawerLayout.SimpleDrawerListener(){
                    @Override
                    public void onDrawerClosed(View drawerView){
                        super.onDrawerClosed(drawerView);
                        FragmentTransaction tx = getSupportFragmentManager().beginTransaction();
                        tx.replace(R.id.main, Fragment.instantiate(MainDraw.this, fragments[pos]));
                        tx.commit();
                    }
                });
                drawer.closeDrawer(navList);
            }
        });

        FragmentTransaction tx = getSupportFragmentManager().beginTransaction();
        tx.replace(R.id.main,Fragment.instantiate(MainDraw.this, fragments[0]));
        tx.commit();

    }


}

统计页面.java：

package com.beerportfolio.beerportfoliopro;

import android.app.ActionBar;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Created by Mike on 1/3/14.
 */
public class StatisticsPage extends Fragment {

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

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String userName = prefs.getString("userName", null);
        String userID = prefs.getString("userID", null);
        String url = "http://www.beerportfolio.com/app_getStatistics.php?";
        String userURLComp = "u=" + userID;


        url = url + userURLComp ;

        Log.d("basicStats", url);


        new getBasicStats(getActivity()).execute(url);
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.statistics_pagelayout, container, false);

    }





}
4

1 回答 1

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问题是您的 DrawerListener 不应该设置在 OnClickListener 中：

@Override public void onItemClick(AdapterView<?> parent, View view, final int pos,long id){
    drawer.setDrawerListener(
        new DrawerLayout.SimpleDrawerListener(){
            @Override public void onDrawerClosed(View drawerView){...}
        }
    );
 }

你的pos整数的范围是这样的，每次抽屉关闭时，onDrawerClose 认为值pos没有改变。由于没有条件检查是否单击了某个项目，因此每次关闭抽屉时都会重新创建相同的 Fragment（除非您单击不同的项目）。

单击项目时将成员布尔值设置为 true，并将成员 int 设置为其位置。使用布尔值来区分项目点击和抽屉关闭：

private boolean mNavItemClicked = false;
private int mNavPosition = 0;
...
@Override protected void onCreate(Bundle savedInstanceState) {
...
    navList.setOnItemClickListener(new ListView.OnItemClickListener {
        @Override public void onItemClick(AdapterView parent, View view, int position, long id) {
            mNavItemClicked = true;
            mNavPosition = position;
            drawerLayout.closeDrawer(navList);
        }
    });
    ActionBarDrawerToggle drawerToggle = new ActionBarDrawerToggle(...) {
        public void onDrawerClosed(View view) {
            if (mNavItemClicked) {
                getSupportFragmentManager().beginTransaction()
                    .replace(R.id.main, Fragment.instantiate(MainDraw.this
                             , fragments[mNavPosition])
                    .commit();

            }
            mNavItemClicked = false;
        }
    };
    drawerLayout.setDrawerListener(drawerToggle);
}

如果您决定使用ActionBarDrawerToggle，请遵循其设计指南并调用 Activity 回调方法onConfigurationChanged和onOptionsItemSelected.

于 2014-01-04T02:07:56.343 回答