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实现ListView删除某行功能

时间:2016-02-07 21:18来源:未知 作者:最模板 点击:
实现ListView删除某行功能,主界面简单的一个ListView视图 RelativeLayout xmlns:android=http://schemas.android.com/apk/res/android xmlns:tools=http://schemas.android.com/tools android:layout_width=match_parent android:layout_

实现ListView删除某行功能,主界面简单的一个ListView视图

<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:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context=".MainActivity">

        <ListView
            android:id="@+id/list_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#888888"/>
    </RelativeLayout>

列表项为一个Textview显示内容,ImageView用来点击显示Popupmenu

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:src="@drawable/ic_overflow" />

</RelativeLayout>

PopupMenu菜单选项

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/remove"
        android:title="@string/remove"/>
</menu>

主要逻辑,加载每一个列表项,对列表项的图片设置监听事件。当该图片被点击时,显式Popupmenu菜单。点击Remove选项将改行删除。

public class MainActivity extends AppCompatActivity {

    private ArrayList<String> items;
    private MyAdapter adapter;

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

        items = new ArrayList<>();
        for (int i = 0; i < Cheeses.CHEESES.length; i++){
            items.add(Cheeses.CHEESES[i]);
        }

        adapter = new MyAdapter(MainActivity.this);

        ListView listView = (ListView) findViewById(R.id.list_view);
        listView.setAdapter(adapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this, "Item Clicked:" + items.get(position), Toast.LENGTH_SHORT).show();
            }
        });
    }

    class MyAdapter extends BaseAdapter{

        private Context context;

        public MyAdapter(Context context) {
            super();
            this.context = context;
        }

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

        @Override
        public Object getItem(int position) {
            return items.get(position);
        }

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

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder;
            if (convertView == null){
                convertView = LayoutInflater.from(context).inflate(R.layout.list_item,null);
                viewHolder = new ViewHolder();
                viewHolder.text_view = (TextView) convertView.findViewById(R.id.text_view);
                viewHolder.image_view = (ImageView) convertView.findViewById(R.id.image_view);
                convertView.setTag(viewHolder);
            }else {
                viewHolder = (ViewHolder) convertView.getTag();
            }
            viewHolder.text_view.setText(items.get(position));
            viewHolder.image_view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    showPopupMenu(v, position);
                }
            });
            return convertView;
        }
    }

    private void showPopupMenu(View view, final int position) {
        final PopupMenu popup = new PopupMenu(MainActivity.this, view);
        popup.getMenuInflater().inflate(R.menu.popup, popup.getMenu());
        popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem menuItem) {
                switch (menuItem.getItemId()) {
                    case R.id.remove:
                        items.remove(position);
                        adapter.notifyDataSetChanged();
                        break;
                }
                return false;
            }
        });
        popup.show();
    }

    public class ViewHolder{
        TextView text_view;
        ImageView image_view;
    }
}
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