不断更新CustomListView适配器中的TextView

问题描述：

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。不断更新CustomListView适配器中的TextView

我曾尝试使用这样的事情

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);

，但它说，authorsList是不是从内部类中访问，需要被声明为final。我希望textview每秒更新一次，以显示升级数量。

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); 
} 

}

答

由你使用的样式来看，我猜你来自一个C＃背景（???也许我的路要走???），您不必块级只读变量和你可以在闭包内进行变异 - 在Java中，如果要在匿名类中引用它们，或者使用全局变量（id在本例中建议最后一种方法），则必须声明最终的结果。虽然在这种情况下没问题，只需将您的列表声明为final，并且您仍然可以将其添加到Runnable中。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

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