ListView fragment demo

介绍

简单应用demo

主要代码如下：

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.xxx.testlistview.MainActivity">

    <TextView
        android:id="@+id/txt_title"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:background="@color/blue"
        android:textColor="@color/white"
        android:text="商品列表"
        android:textSize="20dp"
        android:textStyle="bold"
        android:gravity="center"/>

    <FrameLayout
        android:id="@+id/fl_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/txt_title"></FrameLayout>

</RelativeLayout>

fg_newlist.xml

activity打开之后加载的listview显示列表

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

    <TextView
        android:id="@+id/txt_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textColor="@color/blue"
        android:textSize="20sp"/>


</LinearLayout>

fg_content.xml

选择列表项之后点击操作显示的内容

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

    <TextView
        android:id="@+id/txt_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textColor="@color/blue"
        android:textSize="20sp"/>
</LinearLayout>

MainActivity.java

显示 NewListFragment的内容

public class MainActivity extends AppCompatActivity {
    private TextView txt_title;
    private FrameLayout fl_content;
    private Context mContext;
    private ArrayList<Data> mDatas = null;
    private FragmentManager fManager = null;
    private long exitTime = 0 ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mContext = MainActivity.this;
        fManager = getFragmentManager();
        bindViews();

        mDatas =  new ArrayList<Data>();
        for(int i = 1; i <= 5; i++){
            Data data = new Data("商品 " + i,i + "~商品信息");
            mDatas.add(data);
        }
        NewListFragment nlFragment = new NewListFragment();
        nlFragment.setfManager(fManager);
        nlFragment.setmDatas(mDatas);
        FragmentTransaction ft = fManager.beginTransaction();
        ft.replace(R.id.fl_content, nlFragment);
        ft.commit();
    }

    private void bindViews() {
        txt_title = (TextView) findViewById(R.id.txt_title);
        fl_content = (FrameLayout) findViewById(R.id.fl_content);
    }

    //点击回退键的处理：判断Fragment栈中是否有Fragment
    //没，双击退出程序，否则像是Toast提示
    //有，popbackstack弹出栈
    @Override
    public void onBackPressed() {
        if (fManager.getBackStackEntryCount() == 0) {
            if ((System.currentTimeMillis() - exitTime) > 2000) {
                Toast.makeText(getApplicationContext(), "再按一次退出程序",
                        Toast.LENGTH_SHORT).show();
                exitTime = System.currentTimeMillis();
            } else {
                super.onBackPressed();
            }
        } else {
            fManager.popBackStack();
            txt_title.setText("商品列表");
        }
    }
}

NewListFragment.java

给llistview添加adapter，并监听点击操作

public class NewListFragment extends Fragment implements AdapterView.OnItemClickListener{
    private FragmentManager fManager;
    private ArrayList<Data> mDatas;
    private ListView list_views;
    private View view;

    public NewListFragment() {
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fg_newlist, container, false);
        Log.e(this.getClass().getSimpleName(), "container: " + container);
        Log.e(this.getClass().getSimpleName(),"view: " + view );
        list_views = (ListView) view.findViewById(R.id.list_news);
        MyAdapter myAdapter = new MyAdapter(getmDatas(), getActivity());
        list_views.setAdapter(myAdapter);
        list_views.setOnItemClickListener(this);

        return view;
    }

    public FragmentManager getfManager() {
        return fManager;
    }

    public void setfManager(FragmentManager fManager) {
        this.fManager = fManager;
    }

    public ArrayList<Data> getmDatas() {
        return mDatas;
    }

    public void setmDatas(ArrayList<Data> mDatas) {
        this.mDatas = mDatas;
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        Log.e(this.getClass().getSimpleName(),"adapterView: " + adapterView );
        Log.e(this.getClass().getSimpleName(), "view: " + view);
        FragmentTransaction fTransaction = fManager.beginTransaction();
        NewContentFragment ncFragment =  new NewContentFragment();
        Bundle bd = new Bundle();
        bd.putString("content", mDatas.get(i).getNew_content());
        ncFragment.setArguments(bd);
        //获取Activity的控件
        TextView txt_title = (TextView) getActivity().findViewById(R.id.txt_title);
        txt_title.setText(mDatas.get(i).getNew_content());
        //加上Fragment替换动画
        //fTransaction.setCustomAnimations(R.anim.fragment_slide_left_enter, R.anim.fragment_slide_left_exit);
        fTransaction.replace(R.id.fl_content, ncFragment);
        //调用addToBackStack将Fragment添加到栈中
        fTransaction.addToBackStack(null);
        fTransaction.commit();
    }
}

MyAdapter.java

listview 适配器

public class MyAdapter extends BaseAdapter {
    private List<Data> mData;
    private Context mContext;

    public MyAdapter(List<Data> mData, Context mContext) {
        this.mData = mData;
        this.mContext = mContext;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if(null == convertView){
            Log.e(this.getClass().getSimpleName(),"MyAdapter---  parent: " + parent);
            convertView = LayoutInflater.from(mContext).inflate(R.layout.fg_content, parent,false);
            viewHolder = new ViewHolder();
            Log.e(this.getClass().getSimpleName(),"convertView: " + convertView );
            viewHolder.txt_item_title =  (TextView) convertView.findViewById(R.id.txt_content);
            convertView.setTag(viewHolder);
            Log.e(this.getClass().getSimpleName(),"MyAdapter---  mData: " + mData.size() + ",viewHolder.txt_item_title: " + viewHolder.txt_item_title);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.txt_item_title.setText(mData.get(position).getNew_title());

        return convertView;
    }

    private class ViewHolder {
        private TextView txt_item_title;
    }
}

NewContentFragment.java

listview选项中显示的内容

public class NewContentFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fg_content, container, false);
        TextView txt_content = (TextView) view.findViewById(R.id.txt_content);
        //getArgument获取传递过来的Bundle对象
        txt_content.setText(getArguments().getString("content"));
        return view;
    }
}

Data.java

信息类

public class Data {
    private String new_title;
    private String new_content;

    public Data(String new_title, String new_content) {
        this.new_title = new_title;
        this.new_content = new_content;
    }

    public String getNew_title() {
        return new_title;
    }

    public void setNew_title(String new_title) {
        this.new_title = new_title;
    }

    public String getNew_content() {
        return new_content;
    }

    public void setNew_content(String new_content) {
        this.new_content = new_content;
    }
}