android ListView内数据的动态添加与删除

main.xml 文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="horizontal"     >    <LinearLayout      android:layout_width="fill_parent" android:layout_height="fill_parent"    android:orientation="vertical"     ><ListView  android:id="@+id/listview"     android:layout_width="fill_parent" android:layout_height="wrap_content"/><Button  android:id="@+id/add"     android:layout_width="wrap_content" android:layout_height="wrap_content"  android:text="添加" /></LinearLayout></LinearLayout>

listview_item.xml文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:orientation="horizontal"    android:background="#000000"    android:padding="20dp"    >        <EditText    android:id="@+id/edit"    android:layout_width="200dp"    android:layout_height="wrap_content"    />    <Button    android:id="@+id/del"    android:layout_width="wrap_content"    android:layout_height="wrap_content"       android:text="删除"    /></LinearLayout>

MainActivity .java

package com.yyy.testandroid;import java.util.ArrayList;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;import android.widget.TextView;public class TestAndroidActivity extends Activity {    /** Called when the activity is first created. */private Button button,add;private TextView text;private ListView listview;public MyAdapter adapter;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        listview = (ListView) findViewById(R.id.listview);        add = (Button) findViewById(R.id.add);        adapter = new MyAdapter(this);        listview.setAdapter(adapter);                add.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubadapter.arr.add("");adapter.notifyDataSetChanged();}});    }            private class MyAdapter extends BaseAdapter {    private Context context;    private LayoutInflater inflater;    public ArrayList<String> arr;    public MyAdapter(Context context) {    super();    this.context = context;    inflater = LayoutInflater.from(context);    arr = new ArrayList<String>();    for(int i=0;i<3;i++){    //listview初始化3个子项    arr.add("");    }    }    @Override    public int getCount() {    // TODO Auto-generated method stub    return arr.size();    }    @Override    public Object getItem(int arg0) {    // TODO Auto-generated method stub    return arg0;    }    @Override    public long getItemId(int arg0) {    // TODO Auto-generated method stub    return arg0;    }    @Override    public View getView(final int position, View view, ViewGroup arg2) {    // TODO Auto-generated method stub    if(view == null){    view = inflater.inflate(R.layout.list_item, null);    }    final EditText edit = (EditText) view.findViewById(R.id.edit);    edit.setText(arr.get(position));    //在重构adapter的时候不至于数据错乱    Button del = (Button) view.findViewById(R.id.del);    edit.setOnFocusChangeListener(new OnFocusChangeListener() {@Overridepublic void onFocusChange(View v, boolean hasFocus) {// TODO Auto-generated method stubif(arr.size()>0){arr.set(position, edit.getText().toString());}}});    del.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub//从集合中删除所删除项的EditText的内容arr.remove(position);adapter.notifyDataSetChanged();}});    return view;    }    }}

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