我们这次的项目，需要这个功能，点击“+”就加1，点击“-”就减1，用来确定菜单的数量

主要java代码如下

参考于http://www.2cto.com/kf/201608/539914.html这个不是在android studio 中的，但同理。

。。。

public class MainActivity extends Activity {

private List> mList = null;

private ListView mListView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mListView = (ListView) this.findViewById(R.id.mList);

mList = new ArrayList>();

Random rdom = new Random();

for (int i = 0; i < 30; i++) {

HashMap hashMap = new HashMap();

hashMap.put("serial", i + "");

hashMap.put("content", "����-" + rdom.nextInt(10000));

hashMap.put("number", rdom.nextInt(20) + "");

mList.add(hashMap);

}

mListView.setAdapter(new MAdapter());

}

private class MAdapter extends BaseAdapter {

private ViewHolder holder = null;

@Override

public int getCount() {

// TODO Auto-generated method stub

return mList.size();

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return mList.get(position);

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

public View getView(final int position, View convertView,

ViewGroup parent) {

AbsListView.LayoutParams lParams = new AbsListView.LayoutParams(

LinearLayout.LayoutParams.MATCH_PARENT, 100);

if (null == convertView) {

holder = new ViewHolder();

convertView = View.inflate(getApplicationContext(),

R.layout.activity_main_item, null);

holder.item_content = (TextView) convertView

.findViewById(R.id.item_content);

holder.item_reduce = (Button) convertView

.findViewById(R.id.item_reduce);

holder.item_number = (TextView) convertView

.findViewById(R.id.item_number);

holder.item_increase = (Button) convertView

.findViewById(R.id.item_increase);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

convertView.setLayoutParams(lParams);

holder.item_serial.setText(mList.get(position).get("serial"));

holder.item_content.setText(mList.get(position).get("content"));

holder.item_number.setText(mList.get(position).get("number"));

holder.item_reduce.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

mList.get(position).put(

"number",""+((Integer.parseInt(mList.get(position).get("number"))) - 1));

notifyDataSetChanged();

}

});

holder.item_increase.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

mList.get(position).put(

"number","" + ((Integer.parseInt(mList.get(position).get("number"))) + 1));

notifyDataSetChanged();

}

});

return convertView;

}

}

private class ViewHolder {

TextView item_serial;

TextView item_content;

Button item_reduce;

TextView item_number;

Button item_increase;

}

}

。。。