Question

我的自定义适配器无法正常工作。我想显示一个listview，listview的每一行都有一个相对布局，里面有一个文本，一个edittext和两个按钮。我已经初始化了一串名字。字符串名称的元素将在listview的每一行中有所不同。我是android的新手。请指出错误并提及为什么输出不可见。这是代码

MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
  ListView listView;
  String[] names=new String[]{
            "Name1" , "Name2" , "Name3"};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);




    listView=(ListView) findViewById(R.id.list);
    listView.setAdapter(new CustomAdapter(this,names));
    listView.setOnItemClickListener(new OnItemClickListener(){

        @Override
        public void onItemClick(AdapterView<?> parent, View v, int position, long id){
            Toast.makeText(
                    getApplicationContext(),((TextView) v.findViewById(R.id.text))
                       .getText(), Toast.LENGTH_SHORT).show();



        }

    });

    }



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

CustomAdapter.java

  import android.content.Context;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.BaseAdapter;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.TextView;

  public class CustomAdapter extends BaseAdapter {


Context context;
final String[] Name;

public CustomAdapter(Context context, String[] Name)
{
    this.context=context;
    this.Name=Name;

}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub

    LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View listView;
    if(convertView==null)
    {
        listView=new View(context);
        listView=inflater.inflate(R.layout.activity_main,null);
        TextView name=(TextView) listView.findViewById(R.id.text);
        name.setText(Name[position]);
        EditText editText=(EditText) listView.findViewById(R.id.editText);
        editText.setHint("write here");
        Button btn1=(Button) listView.findViewById(R.id.btnok);
        name.setText("OK");
        Button btn2=(Button) listView.findViewById(R.id.btncancel);
        name.setText("cancel");
    }
    else
    {
        listView= (View) convertView;
    }

    return listView;
}





@Override
public int getCount() {
    // TODO Auto-generated method stub
    return Name.length;
}

@Override
public Object getItem(int arg0) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int arg0) {
    // TODO Auto-generated method stub
    return 0;
}


  }

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/childlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.customlayout.MainActivity" >

<TextView
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />

<EditText
    android:id="@+id/editText"
    android:layout_width="400dp"
    android:layout_height="50dp"

     />

<Button
    android:id="@+id/btnok"
    android:layout_below="@+id/editText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="OK"

     />
<Button
    android:id="@+id/btncancel"
    android:layout_below="@+id/editText"
    android:layout_toRightOf="@+id/btnLike"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Cancel"

     />

listview.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <ListView xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/list"
 android:layout_height="wrap_content"
 android:layout_width="match_parent">
 </ListView>

Answer 1

尝试改变它的改变，

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.activity_main, parent, false);
        }
        TextView name = (TextView) convertView.findViewById(R.id.text);
        name.setText(Name[position]);
        EditText editText = (EditText) convertView.findViewById(R.id.editText);
        editText.setHint("write here");
        Button btn1 = (Button) convertView.findViewById(R.id.btnok);
        name.setText("OK");
        Button btn2 = (Button) convertView.findViewById(R.id.btncancel);
        name.setText("cancel");
        return convertView;
    }

并删除

@Override
public Object getItem(int arg0) {
    // TODO Auto-generated method stub
    return Name[arg0];
}

@Override
public long getItemId(int arg0) {
    // TODO Auto-generated method stub
    return arg0;
}

Answer 2

试试吧，

{{1}}

这个自定义适配器有什么问题？

2 个答案: