如何在 android 中动态地将侦听器添加到 customAdapter 上的按钮

Question

我想 increment/decrement 计数并在单击按钮时将其更新到数据库。问题是按钮在适配器上，我应该如何将侦听器应用于单个按钮并更新 UI 以及数据库中特定用户的计数。

我的收获：上图显示了我创建的内容。 www、aaa、xxx 是用户，当我单击 + 或 - 按钮时，我想增加计数并更新数据库。以下是我为此所做的所有代码：

Admin_Dashbord.java Activity Class

public class Admin_Dashbord extends Activity 
{
    //TextView a_shop_key,a_shop_name,a_shop_owner,a_shop_ophone,a_shop_address1,a_shop_address2,a_shop_address3,a_e_names;
    String key,name,owner,ownerphone,address1,address2,address3,empnames,n_emp1,txtname="",getdata;
    int n_emp;
    Button submit;
    TextView txtv_shopname;
    LinearLayout linear;
    Customer_Adapter custom;
    //ArrayList<No_Of_Emp_Pojo> getdata;

    ArrayList<No_Of_Emp_Pojo> newdata=new ArrayList<No_Of_Emp_Pojo>();
    ArrayList<No_Of_Emp_Pojo> temp=new ArrayList<No_Of_Emp_Pojo>();
    Network_Class net=new Network_Class();
    ListView li;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.admin_dashbord);

        linear=(LinearLayout)findViewById(R.id.admin_dashbord_layout2);
        submit=(Button)findViewById(R.id.dashbord_shop_submit);
        li=(ListView)findViewById(R.id.emp_list);
        txtv_shopname=(TextView)findViewById(R.id.shopname);


        Intent intent=getIntent();
        Bundle b=intent.getExtras();
        key=b.getString("SHOP_ID");
        name=b.getString("SHOP_NAME");
        owner=b.getString("OWNER_NAME");
        ownerphone=b.getString("OWNER_PHONE");
        address1=b.getString("ADDRESS1");
        address2=b.getString("ADDRESS2");
        address3=b.getString("ADDRESS3");
        //empnames=b.getString("EMP_NAMES");
        n_emp1=b.getString("N_EMP");
        n_emp=Integer.parseInt(b.getString("N_EMP"));

        txtv_shopname.setText(name);



        newdata=getdetail(key);
        System.out.println("This is Admin Dashboard");
        custom=new Customer_Adapter(getApplicationContext(), R.layout.shop_listview_item, newdata);
        li.setAdapter(custom);
        //newdata.clear();
        custom.notifyDataSetChanged();

    }   
    public ArrayList<No_Of_Emp_Pojo> getdetail(final String key)
    {
        Thread th=new Thread(new Runnable() 
        {
            @Override
            public void run() 
            {
                getdata=net.n_employees(key);
                System.out.println("In Thread first");
                temp = no_emp(getdata);
            }
        });

        th.start();
        try
        {
            th.join();
        }
        catch(Exception e)
        {
            System.out.println("Thread Jpoin Problem "+e.getMessage());

        }

        return temp;
    }

    public ArrayList<No_Of_Emp_Pojo> no_emp(String result)
    {
        ArrayList<No_Of_Emp_Pojo> emp=new ArrayList<No_Of_Emp_Pojo>();
        try
        {
            JSONArray j_array=new JSONArray(result);
            for(int i=0; i<j_array.length(); i++)
            {
                JSONObject j_object=j_array.getJSONObject(i);
                No_Of_Emp_Pojo no=new No_Of_Emp_Pojo();

                no.setId(j_object.getInt("emp_id"));
                no.setCount(j_object.getInt("count"));
                no.setE_name(j_object.getString("emp_name"));

                emp.add(no);
            }
        }   
            catch(JSONException e)
            {
                Log.e("Log_tag", "Error Parsing in Area......"+e.toString());               
                Log.e("Log_Answers","Second Error Parsing in Area......"+result);
            }
        System.out.println("This is parsing  "+emp.toString());
        return emp;
    }

}

Customer_Adapter.java

  public class Customer_Adapter extends ArrayAdapter<No_Of_Emp_Pojo>
{
    private int res;
    private LayoutInflater inflaters;
    Button signal,increment,decrement;
    public Customer_Adapter(Context context, int resource, List<No_Of_Emp_Pojo> objects) 
    {
        super(context, resource, objects);
        res=resource;
        inflaters=LayoutInflater.from(context);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        convertView=(LinearLayout)inflaters.inflate(res, null);
        TextView count=(TextView)convertView.findViewById(R.id.show_waiting);
        TextView name=(TextView)convertView.findViewById(R.id.show_emp_name);
        signal=(Button)convertView.findViewById(R.id.green_signal);
        increment=(Button)convertView.findViewById(R.id.pluse_signal);
        decrement=(Button)convertView.findViewById(R.id.minus_signal);


        count.setTextColor(Color.parseColor("#000000"));
        name.setTextColor(Color.parseColor("#000000"));

        No_Of_Emp_Pojo no=getItem(position);
        count.setText(Integer.toString(no.getCount()));
        name.setText(no.getE_name());

        increment.setOnClickListener(no.addlistner);
        decrement.setOnClickListener(no.sublistner);

        return convertView;
    }
}

No_Of_Emp_Pojo.java

  public class No_Of_Emp_Pojo 
{
    int count,id;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    String e_name;
    public int getCount() {
        return count;
    }
    public void setCount(int count) {
        this.count = count;
    }
    public String getE_name() {
        return e_name;
    }
    public void setE_name(String e_name) {
        this.e_name = e_name;
    }

    public OnClickListener addlistner=new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            System.out.println("Add Count is "+ getId());

        }
    };

    public OnClickListener sublistner=new OnClickListener() 
    {       
        @Override
        public void onClick(View v) 
        {
            System.out.println("Minus Count is "+getId());

        }
    };

}

我上网发现，我在 No_Of_Emp_Pojo class 中编写了 OnClickListener，当我点击按钮时它会打印 id 但我无法在 UI 上更新它以及数据库中，因为它给了我 pojo 中的侦听器，所以如何在 Admin_Dashbord.java activity 上获取它，这样更新适配器上的计数以及中的值将变得更加容易数据库。

Answer 1

在Adapter中，getView方法，为特定的按钮写onClickListener。您应该维护适当的 array/pojo 文件以保存文本视图中的点击次数。

Answer 2

在适配器的 getView 方法中写入而不是 POJO

Button button = (Button)view.findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View arg0) {
                     Toast.makeText(context,"your msg", Toast.LENGTH_LONG)
                    }
            });

基本上，适配器为列表的每个元素设置不同的视图，因此在按钮上设置侦听器也将根据 reference check 的要求动态工作。

Answer 3

在getView中的项目按钮上添加点击监听器： increment.setOnClickListener(这个); decrement.setOnClickListener(这个);

然后在 getView 中的这些按钮上添加该对象的标签： increment.setTag（否）； // "no" 是你的 cuttent 对象（模式） decrement.setTag（否）； // "no" 是你的 cuttent 对象（模式）

现在在适配器中实现 Onclick 方法：

public void onClick(View v) {
  switch(v.getId()) {
     case R.id.pluse_signal:
       No_Of_Emp_Pojo selectedItem = (No_Of_Emp_Pojo)v.getTag();
       //now you can update this item in db or in any place.
       break;
     case R.id.minus_signal:
       No_Of_Emp_Pojo selectedItem1 = (No_Of_Emp_Pojo)v.getTag();
       //now you can update this item in db or in any place.
       break;
}
}

并且将为列表视图的每个项目调用此点击列表。并且您可以获得与每个项目相关的模型。

Answer 4

在 Custom_Adapter.java 而非 No_Of_Emp_Pojo.java

上写下你的听众

在 Customer_Adapter.java

上尝试此代码

 public class Customer_Adapter extends ArrayAdapter<No_Of_Emp_Pojo>
{
    private int res;
    private LayoutInflater inflaters;
    Button signal,increment,decrement;
    public Customer_Adapter(Context context, int resource, List<No_Of_Emp_Pojo> objects) 
    {
        super(context, resource, objects);
        res=resource;
        inflaters=LayoutInflater.from(context);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        convertView=(LinearLayout)inflaters.inflate(res, null);
        TextView count=(TextView)convertView.findViewById(R.id.show_waiting);
        TextView name=(TextView)convertView.findViewById(R.id.show_emp_name);
        signal=(Button)convertView.findViewById(R.id.green_signal);
        increment=(Button)convertView.findViewById(R.id.pluse_signal);
        decrement=(Button)convertView.findViewById(R.id.minus_signal);


        count.setTextColor(Color.parseColor("#000000"));
        name.setTextColor(Color.parseColor("#000000"));

        No_Of_Emp_Pojo no=getItem(position);
        count.setText(Integer.toString(no.getCount()));
        name.setText(no.getE_name());

        increment.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View arg0) {
             //your incrementation code here
             }
        });

        decrement.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View arg0) {
             //your decrementation code here
             }
        });

        return convertView;
    }
}

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