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>  

    <?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>  

    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() {                    @Override                    public void onClick(View arg0) {                        // TODO Auto-generated method stub                        adapter.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() {                        @Override                        public void onFocusChange(View v, boolean hasFocus) {                            // TODO Auto-generated method stub                            if(arr.size()>0){                                arr.set(position, edit.getText().toString());                            }                        }                    });                    del.setOnClickListener(new OnClickListener() {                        @Override                        public 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;                }            }        }