动态自定义ListView？

Question

我正在尝试创建一个动态的自定义 ListView，用户可以在其中输入姓名和年龄，次数未知。感谢@Razgriz，他帮助我让自定义 ListView 正常工作。我现在正试图让它充满活力。我的问题是当我通过构造函数实例化 NameAndAgeClass 对象时，我的数组列表将显示我通过 onclick 输入的内容，但它也多次显示原始实例化，在 NameAndAgeClass class 中我试图为姓名和年龄创建 2 个数组列表，但出现内存不足错误。在 M class 的 for 循环中添加一个条目到 ArrayList nameAndAgeList 我如何获得我现在正在使用的 NameAndAgeClass 对象的大小，而我 < 10.

public class MainActivity extends Activity {

M gg = new M();

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


public void ss(View v){       
    Intent intent2 = new Intent(MainActivity.this,M.class);
    startActivity(intent2);       
 }
    public void sa(View v){       
    gg.addit("phil");       
   } 

}

 public class M extends Activity {

static ArrayList<NameAndAgeClass> nameAndAgeList = new     
ArrayList<NameAndAgeClass>();
static NameAndAgeClass nandc = new NameAndAgeClass("bill", 88);
 static int ihg = 0;

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

    ListView nameAndAgeListView = (ListView) findViewById(R.id.listView);       


   //create your listView with your custom object       
   /*       
    get no error with this just says not loading do i want to cancel

    for(int i = 1 ; i < nameAndAgeList.size() ; i ++){
        NameAndAgeClass entry = new NameAndAgeClass("lou",23);
        nameAndAgeList.add(entry);
    }
    */

    for(int i = 1 ; i < 10 ; i ++){
        NameAndAgeClass entry = new NameAndAgeClass("lou",23);
        nameAndAgeList.add(entry);
    }

   //create your adapter, use the nameAndAgeList ArrayList
    CustomListViewAdapterNameAndAge nameAndAgeAdapter = new  
   CustomListViewAdapterNameAndAge(this, nameAndAgeList);

   //get your listView and use your adapter
    nameAndAgeListView.setAdapter(nameAndAgeAdapter);

    nameAndAgeListView.setOnItemClickListener(new  
    AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int  
        i, long l) {
            /*
                Do what ever you want inside this onItemClick function
             */
        }
    });

}


public void addit(String nn){   
     ihg++;       

     nameAndAgeList.add(( new NameAndAgeClass("phill",ihg)));  
    }   
}

public class NameAndAgeClass {

static public ArrayList<String> namee = new ArrayList<String>();
static public ArrayList<Integer> agee = new ArrayList<Integer>();

 String name;
int age;

public NameAndAgeClass(String name, int age) {
    this.name = name;
    this.age = age;

    namee.add(name);
    agee.add(age);
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
}

Answer 1

希望这会对某人有所帮助，即使我确定这可能不是正确的方法，或者有更好的方法。但这是需要修补的东西，也许它会让一些人不再头疼我必须让一个 2 列动态列表视图工作。感谢@Razgriz 对我的帮助！

public class MainActivity extends Activity {

M gg = new M();

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


public void ss(View v){       
    Intent intent2 = new Intent(MainActivity.this,M.class);
    startActivity(intent2);       
 }
    public void sa(View v){       
    gg.addit("phil");       
   } 

}

 public class M extends Activity {

static ArrayList<NameAndAgeClass> nameAndAgeList = new     
ArrayList<NameAndAgeClass>();

 static int ihg = 0;

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

    ListView nameAndAgeListView = (ListView) findViewById(R.id.listView);       


   //create your listView with your custom object       

   //create your adapter, use the nameAndAgeList ArrayList
    CustomListViewAdapterNameAndAge nameAndAgeAdapter = new  
   CustomListViewAdapterNameAndAge(this, nameAndAgeList);

   //get your listView and use your adapter
    nameAndAgeListView.setAdapter(nameAndAgeAdapter);

    nameAndAgeListView.setOnItemClickListener(new  
    AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int  
        i, long l) {
            /*
                Do what ever you want inside this onItemClick function
             */
        }
    });

}


public void addit(String nn){   


     ihg++;

         NameAndAgeClass entry = new NameAndAgeClass(nn,ihg);
         nameAndAgeList.add(entry);
    }   
}

public class NameAndAgeClass {


 String name;
int age;

public NameAndAgeClass(String name, int age) {
    this.name = name;
    this.age = age;


}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
}

Answer 2

以下是我的做法。

在主 activity 布局文件中，我在布局中放置了 2 个 ID 为 nameEditText 和 ageEditText 的 EditText 字段，位于 listView 下方作为保存按钮。在您的按钮中，不要忘记添加行：

android:click="onSave"

并在您的 Main Activity 中创建一个这样的函数：

public void onSave(View view){
    //this is the function that will activate when you click your button
}

不用说，您应该这样连接您的 EditText：

public class MainActivity extends Activity {

    //DO NOT DECLARE THIS AS STATIC, OTHERWISE YOU WON'T BE ABLE TO ADD TO IT
    ArrayList<NameAndAgeClass> nameAndAgeList = new ArrayList<NameAndAgeClass>();

    EditText nameInput;
    EditText ageInput;

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

        //hook up your EditText as such:
        nameInput = (EditText) findViewById(R.id.nameEditText);
        ageInput = (EditText) findViewById(R.id.ageEditText);

        //more of your code here...

    }

    //more of your code here, and the onSave function

 }

我们想要做的是，当您单击此 "Save" 按钮时，我们将从我们在 onCreate 函数中初始化的 editText 获取输入并将其添加到我们的 ArrayList。下面是我们将如何做到这一点。

public void onSave(View view){

    //we get the string values from the EditText input
    Sting nameInputFromField = nameInput.getText().toString();
    Sting ageInputFromField = ageInput.getText().toString();

    //we create a class using our values
    NameAndAgeClass entry = new NameAndAgeClass(nameInputFromField, ageInputFromField);

    //then we add it to our ArrayList
    nameAndAgeList.add(entry);

    //after that, we get the customListViewAdapter (I trust that you have this one)
    //and call a neat function
    //the function is called something like that
    nameAndAgeAdapter.notifyDataSetChanged();
}

notifyDataSetChanged 的作用是 "refreshes" 您的 listView。通常这是在 ListViews 数据中进行修改后完成的，以便用户可以立即看到更改。

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