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ListView的经典实现方法展示：动态添加、删除行的例子

作为Android开发人员，ListView是最常用的列表控件，其实现动态添加和删除行的功能至关重要。本节将详细介绍ListView的实现方法，并探讨优化策略。

首先，ListView的基本功能实现。通过自定义Adapter类，可以实现数据源与ListView的绑定。Adapter类负责将数据转换为View组，确保ListView能够正确显示数据。

其次，优化 ListView 的性能至关重要。以下优化策略可以帮助提升ListView的运行效率：

代码示例

以下是一个完整的实现代码示例，展示了从数据模型到ListView展示的完整流程：

数据模型类：

public class Data {
    private int id;
    private ImageView image;
    private int num;
    public Data(int id, ImageView image, int num) {
        this.id = id;
        this.image = image;
        this.num = num;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getImage() {
        return image;
        // ...
    }
    public void setName(String image) {
        this.image = image;
    }
    public int getNum() {
        return num;
    }
    public void setNum(int num) {
        this.num = num;
    }
}

Adapter类：

public class ShowAdapter extends BaseAdapter {
    private Context mContext;
    private List mList;
    public ShowAdapter(Context context, List list) {
        this.mContext = context;
        this.mList = list;
    }
    @Override
    public int getCount() {
        if (mList != null && !mList.isEmpty()) {
            return mList.size();
        } else {
            return 0;
        }
    }
    @Override
    public Object getItem(int position) {
        if (mList != null && !mList.isEmpty()) {
            return mList.get(position);
        } else {
            return null;
        }
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView != null) {
            holder = (ViewHolder) convertView.getTag();
        } else {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.adater_line, null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        }
        Data data = (Data) getItem(position);
        holder.textView.setText(String.valueOf(data.getNum()));
        return convertView;
    }
    static class ViewHolder {
        @InjectView(R.id.imageView)
        ImageView imageView;
        @InjectView(R.id.textView)
        TextView textView;
        ViewHolder(View view) {
            ButterKnife.inject(this, view);
        }
    }
}

主界面布局文件：

Activity类：

public class MainActivity extends AppCompatActivity {
    @InjectView(R.id.btn_add)
    Button btnAdd;
    @InjectView(R.id.btn_remove)
    Button btnRemove;
    @InjectView(R.id.lv_show)
    ListView lvShow;
    private List list;
    private ShowAdapter showAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.inject(this);
        Init();
    }
    private void Init() {
        list = new ArrayList();
        for (int i = 0; i < 3; i++) {
            list.add("123");
        }
        showAdapter = new ShowAdapter(this, list);
        lvShow.setAdapter(showAdapter);
    }
    @OnClick({R.id.btn_add, R.id.btn_remove})
    public void pickDoor(View view) {
        if (view == btnAdd) {
            list.add("123");
            showAdapter.notifyDataSetChanged();
        } else {
            list.remove(0);
            showAdapter.notifyDataSetChanged();
        }
    }
}

通过以上代码示例，可以实现一个功能完善的ListView，支持动态添加和删除行。优化策略的实施能够显著提升ListView的性能表现，适用于各种复杂场景。

ListView优化策略

Adapter类实现：

public class ShowAdapter extends BaseAdapter {
    private Context mContext;
    private List mList;
    public ShowAdapter(Context context, List list) {
        this.mContext = context;
        this.mList = list;
    }
    @Override
    public int getCount() {
        if (mList != null && !mList.isEmpty()) {
            return mList.size();
        } else {
            return 0;
        }
    }
    @Override
    public Object getItem(int position) {
        if (mList != null && !mList.isEmpty()) {
            return mList.get(position);
        } else {
            return null;
        }
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView != null) {
            holder = (ViewHolder) convertView.getTag();
        } else {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.adater_line, null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        }
        Data data = (Data) getItem(position);
        holder.textView.setText(String.valueOf(data.getNum()));
        return convertView;
    }
    static class ViewHolder {
        @InjectView(R.id.imageView)
        ImageView imageView;
        @InjectView(R.id.textView)
        TextView textView;
        ViewHolder(View view) {
            ButterKnife.inject(this, view);
        }
    }
}

通过上述优化策略和代码实现，可以有效提升ListView的性能表现，使其在复杂场景下也能流畅运行。