Question

在这个应用程序中，用户点击屏幕获得积分，然后购买升级，我想更新textview的原因是因为我想显示用户拥有的升级数量。

我试过用这样的东西

  handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            for (int i = 0; i < 10; i++) {


                HashMap<String, String> data = new HashMap<>();
                data.put("title", bookTitles[i]);
                data.put("pages", bookPages[i]);
                data.put("author", authors[i]);


                authorList.add(data);
            } 
            handler.postDelayed(this, 1000);

        }
    }, 1000);

但是它表示不能从内部类中访问authorsList，需要声明final。我希望textview每秒更新一次，以便显示升级量。

package com.example.navjeevenmann.mytycoon;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.HashMap;

public class ThirdActivity extends AppCompatActivity {
private ListView listView;
private int Add;
private int countervalue;
private TextView myCount;
private String countstring;
Handler handler = new Handler();
private ImageButton Home;
private ImageButton AutoClick;
private int firstoption;
private int nigg;
private String str;
private CustomListViewAdapter customListViewAdapter;

@Override

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_third);
    getSupportActionBar().hide();


    Bundle it = getIntent().getExtras();
    countervalue = it.getInt("Count");
    Add = it.getInt("Add");
    myCount = (TextView) findViewById(R.id.textView3);
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            Display(countervalue);
            handler.postDelayed(this, 1);
        }
    }, 50);

    AutoClick = (ImageButton) findViewById(R.id.autoclick);
    AutoClick.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent autoclick = new Intent(getApplicationContext(), SecondActivity.class);
            autoclick.putExtra("Count", countervalue);
            autoclick.putExtra("Add", Add);
            startActivity(autoclick);
        }
    });
    Home = (ImageButton) findViewById(R.id.imageView2);
    Home.setOnClickListener(new View.OnClickListener() {
        @Override

        public void onClick(View view) {
            Intent gohome = new Intent(getApplicationContext(), MainActivity.class);
            gohome.putExtra("Count", countervalue);
            gohome.putExtra("Add", Add);
            startActivity(gohome);
        }
    });
    listView = (ListView) findViewById(R.id.List);

    final String[] bookTitles = new String[]{
            "The Alchemist",
            "The Giver",
            "How to Kill a Mockingbird",
            "Lost in Paradise",
            "The Complete Android and Java Developer...",
            "Titanic",
            "The Kite Runner",
            "Lord of the Rings",
            "The Hobbit",
            "Java in a Nutshell",
            "The Social Network",
            "Game Programming All in One"

    };

    final String[] bookPages = new String[12];

    final String[] authors = new String[]{

            "Paulo Coelho",
            "Lois Lowry",
            "Harper Lee",
            "Somell Author!",
            "Paulo and Fahd",
            "Simon Adams",
            "Khaled Hosseini",
            "J. R. R. Tolkien",
            "J. R. R. Tolkien",
            "Flannagan",
            "Ben Mezrich",
            "Harbour"

    };

    ArrayList<HashMap<String, String>> authorList = new ArrayList<>();


    //Setup adapter
    customListViewAdapter = new CustomListViewAdapter(getApplicationContext(), authorList);
    listView.setAdapter(customListViewAdapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            firstoption = position;


        }
    });
    if (firstoption == 0) {
        nigg++;
        str = Integer.toString(nigg);
        bookPages[firstoption] = str;
    }

    for (int i = 0; i < 10; i++) {


        HashMap<String, String> data = new HashMap<>();
        data.put("title", bookTitles[i]);
        data.put("pages", bookPages[i]);
        data.put("author", authors[i]);


        authorList.add(data);
    }
}


public void Display(int countervalue) {
    countstring = String.valueOf(countervalue);
    myCount.setText("$" + countstring);
}

}

Answer 1

根据你使用的风格来判断，我猜你来自C＃背景（也许我已经离开???），你没有块级只读变量，你可以从内部变异一个闭包 - 在Java中你必须声明决赛，如果你想在匿名类中引用它们或使用全局变量（在这种情况下id建议最后的方法）。在这种情况下，这很好;只需将您的列表声明为final，您仍然可以在Runnable中添加它。要反映UI中的更改，请在添加到列表后立即调用customListViewAdapter.notifyDataSetChanged（）。

不断更新CustomListView适配器中的TextView

1 个答案: