DrawerItemClickListener不能被解析为一个类型

问题描述

我在建立DrawerItemClickListener但是我得到一个错误，说明的过程：即使我宣布该方法在code进一步向下DrawerItemClickListener不能被解析为一个类型。我看了过来好几次，我不明白我做错了。

 私人无效_initMenu（）{        drawerListView.setOnItemClickListener（新DrawerItemClickListener（））;    }    处理器ResponseHandler所=新的处理程序（）{
        @覆盖
        公共无效的handleMessage（消息MSG）{
            populateListWithVideos（MSG）;
        };
    };    私人无效populateListWithVideos（消息MSG）{
        库lib =（库）msg.getData（）得到（
                GetYouTubeUserVideosTask.LIBRARY）;
        listView.setVideos（lib.getVideos（））;
    }    @覆盖
    保护无效的onStop（）{
        ResponseHandler所= NULL;
        super.onStop（）;
    }    @覆盖
    公共无效onVideoClicked（视频短片）{
        意向意图=新意图（这一点，Player.class）;
        intent.putExtra（ID，video.getId（））;
        intent.putExtra（称号，video.getTitle（））;
        intent.putExtra（上载，video.getUploader（））;
        intent.putExtra（观看次数，video.getviewCount（））;
        startActivity（意向）;
    }    @覆盖
    公共无效onConfigurationChanged（配置NEWCONFIG）{
        super.onConfigurationChanged（NEWCONFIG）;
        actionBarDrawerToggle.onConfigurationChanged（NEWCONFIG）;
    }    @覆盖
    公共布尔onCreateOptionsMenu（菜单菜单）{
        MenuInflater吹气= getMenuInflater（）;
        inflater.inflate（R.menu.main，菜单）;
        返回super.onCreateOptionsMenu（菜单）;
    }    @覆盖
    公共布尔onOptionsItemSelected（菜单项项）{        如果（actionBarDrawerToggle.onOptionsItemSelected（项目））{
            返回true;
        }
        返回super.onOptionsItemSelected（项目）;
    }    私有类ImagePagerAdapter扩展PagerAdapter {
        公共ImagePagerAdapter（活动行为，INT [] mImages，
                的String [] stringArra）{
            imageArray = mImages;
            活性=行为;
            字符串数组= stringArra;
        }        //这是你的构造
        公共ImagePagerAdapter（）{
            超（）;        }        私人诠释[] = mImages新INT [] {R.drawable.selstation_up_btn，
                R.drawable.classical_up_btn，R.drawable.country_up_btn，
                R.drawable.dance_up_btn，R.drawable.hiphop_up_btn，
                R.drawable.island_up_btn，R.drawable.latin_up_btn，
                R.drawable.pop_up_btn，R.drawable.samba_up_btn};        私有String []字符串数组=新的String [] {VEVO
                TheMozARTGROUP，TimMcGrawVEVO，TiestoVEVO，
        EminemVEVO};        @覆盖
        公众诠释的getCount（）{
            返回mImages.length;
        }        @覆盖
        公共布尔isViewFromObject（查看视图，Object对象）{
            返回查看==（（ImageView的）对象）;
        }        @覆盖
        公共对象instantiateItem（ViewGroup中的容器，INT位置）{
            上下文的背景下= Home.this;
            ImageView的ImageView的=新ImageView的（上下文）;
            imageView.setScaleType（ScaleType.FIT_XY）;
            imageView.setImageResource（mImages [位置]）;
            （（ViewPager）容器）.addView（ImageView的，0）;
            返回ImageView的;
        }        公共无效destroyItem（ViewGroup中的容器，INT位置，Object对象）{
            （（ViewPager）容器）.removeView（（ImageView的）对象）;
        }        私有类DrawerItemClickListener工具
        ListView.OnItemClickListener {            @覆盖
            公共无效onItemClick（适配器视图父母，观景，
                    INT位置，长的id）{                drawerListView.setItemChecked（位置，真正的）;
                字符串文本=菜单中点击......应实行
                Toast.makeText（Home.this，文字，Toast.LENGTH_LONG）.show（）;
                drawerLayout.closeDrawer（drawerListView）;            }
        }
    }
}
 

解决方案

您需要创建类DrawerItemClickListener实现ListView.OnItemClickListener 结果结果
在Android的文档完整的例子和说明的

这是它的片段：结果

 私有类DrawerItemClickListener实现ListView.OnItemClickListener {
    @覆盖
    公共无效onItemClick（适配器视图父母，观景，INT位置，长的id）{
        选择信息（位置）;
    }
}/ **片段互换的主要内容视图* /
私人无效选择信息（INT位置）{
    //创建一个新片段，并指定这个星球表明，基于对位置
    片段片段=新PlanetFragment（）;
    捆绑ARGS =新包（）;
    args.putInt（PlanetFragment.ARG_PLANET_NUMBER，位置）;
    fragment.setArguments（参数）;    //将替换现有的片段插入片段
    FragmentManager fragmentManager = getFragmentManager（）;
    fragmentManager.beginTransaction（）
                   .replace（R.id.content_frame，片段）
                   。承诺（）;    //高亮显示所选项目，更新称号，并关​​上抽屉
    mDrawerList.setItemChecked（位置，真正的）;
    的setTitle（mPlanetTitles [位置]）;
    mDrawerLayout.closeDrawer（mDrawerList）;
}
 

I'm in the process of setting up a DrawerItemClickListener however I'm getting an error stating: DrawerItemClickListener cannot be resolved to a type even though I declare the method further down in the code. I've looked it over several times and I do not see what I have done wrong.

    private void _initMenu() {

        drawerListView.setOnItemClickListener(new DrawerItemClickListener());

    }

    Handler responseHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            populateListWithVideos(msg);
        };
    };

    private void populateListWithVideos(Message msg) {
        Library lib = (Library) msg.getData().get(
                GetYouTubeUserVideosTask.LIBRARY);
        listView.setVideos(lib.getVideos());
    }

    @Override
    protected void onStop() {
        responseHandler = null;
        super.onStop();
    }

    @Override
    public void onVideoClicked(Video video) {
        Intent intent = new Intent(this, Player.class);
        intent.putExtra("id", video.getId());
        intent.putExtra("title", video.getTitle());
        intent.putExtra("uploader", video.getUploader());
        intent.putExtra("viewCount", video.getviewCount());
        startActivity(intent);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        actionBarDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private class ImagePagerAdapter extends PagerAdapter {
        public ImagePagerAdapter(Activity act, int[] mImages,
                String[] stringArra) {
            imageArray = mImages;
            activity = act;
            stringArray = stringArra;
        }

        // this is your constructor
        public ImagePagerAdapter() {
            super();

        }

        private int[] mImages = new int[] { R.drawable.selstation_up_btn,
                R.drawable.classical_up_btn, R.drawable.country_up_btn,
                R.drawable.dance_up_btn, R.drawable.hiphop_up_btn,
                R.drawable.island_up_btn, R.drawable.latin_up_btn,
                R.drawable.pop_up_btn, R.drawable.samba_up_btn };

        private String[] stringArray = new String[] { "vevo",
                "TheMozARTGROUP‎", "TimMcGrawVEVO‎", "TiestoVEVO‎",
        "EminemVEVO‎" };

        @Override
        public int getCount() {
            return mImages.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == ((ImageView) object);
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            Context context = Home.this;
            ImageView imageView = new ImageView(context);
            imageView.setScaleType(ScaleType.FIT_XY);
            imageView.setImageResource(mImages[position]);
            ((ViewPager) container).addView(imageView, 0);
            return imageView;
        }

        public void destroyItem(ViewGroup container, int position, Object object) {
            ((ViewPager) container).removeView((ImageView) object);
        }

        private class DrawerItemClickListener implements
        ListView.OnItemClickListener {

            @Override
            public void onItemClick(AdapterView parent, View view,
                    int position, long id) {

                drawerListView.setItemChecked(position, true);


                String text = "menu click... should be implemented";
                Toast.makeText(Home.this, text, Toast.LENGTH_LONG).show();
                drawerLayout.closeDrawer(drawerListView);

            }
        }
    }
}

解决方案

You need to create class DrawerItemClickListener implements ListView.OnItemClickListener

Full example and explanation in Android docs https://developer.android.com/training/implementing-navigation/nav-drawer.html#ListItemClicks

the fragment from it:

private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView parent, View view, int position, long id) {
        selectItem(position);
    }
}

/** Swaps fragments in the main content view */
private void selectItem(int position) {
    // Create a new fragment and specify the planet to show based on position
    Fragment fragment = new PlanetFragment();
    Bundle args = new Bundle();
    args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
    fragment.setArguments(args);

    // Insert the fragment by replacing any existing fragment
    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.beginTransaction()
                   .replace(R.id.content_frame, fragment)
                   .commit();

    // Highlight the selected item, update the title, and close the drawer
    mDrawerList.setItemChecked(position, true);
    setTitle(mPlanetTitles[position]);
    mDrawerLayout.closeDrawer(mDrawerList);
}

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