ListView封装

直接上代码。

Adapter的封装

package com.jackeysun.touchpullview;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import java.util.ArrayList;import java.util.List;/** * Created by jackey on 2017/7/23. */public abstract class AbsAdapter<T, H extends AbsViewHolder> extends BaseAdapter {    protected List<T> mDatas;    protected Context mContext;    protected LayoutInflater mLayoutInflater;    protected int layoutId;    protected H holder;    public AbsAdapter(Context context, int layoutId) {        this.mContext = context;        this.mDatas = new ArrayList<>();        this.layoutId = layoutId;        this.mLayoutInflater = LayoutInflater.from(context);    }    protected void setItem(List<T> mDatas) {        this.mDatas.clear();        for (T data : mDatas) {            this.mDatas.add(data);        }        this.notifyDataSetChanged();    }    protected void addItems(List<T> mDatas) {        for (T data : mDatas) {            addItem(data);        }        this.notifyDataSetChanged();    }    private void addItem(T data) {        mDatas.add(data);    }    @Override    public int getCount() {        return mDatas == null ? 0 : mDatas.size();    }    @Override    public Object getItem(int i) {        return mDatas.get(i);    }    @Override    public long getItemId(int i) {        return i;    }    @Override    public View getView(int i, View view, ViewGroup viewGroup) {        holder = null;        if (view == null) {            holder = newViewHolder();            view = mLayoutInflater.inflate(layoutId, null);            view.setTag(holder);        } else {            holder = (H) view.getTag();        }        holder.initItemView(view);        initData(mDatas.get(i), holder);        return view;    }    protected abstract void initData(T datas, H holder);    public abstract H newViewHolder();}

ViewHolder的封装

package com.jackeysun.touchpullview;import android.view.View;/** * Created by jackey on 2017/7/23. */public abstract class AbsViewHolder {    public abstract void initItemView(View containerView);}

使用方式

package com.jackeysun.touchpullview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

private ListView listView;private MyAdapter adapter;private List<String> datas;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    listView = (ListView) findViewById(R.id.listView);    adapter = new MyAdapter(MainActivity.this, R.layout.item);    listView.setAdapter(adapter);}public void click(View view){    datas = new ArrayList<>();    for (int i = 0; i < 10; i++) {        datas.add(new String("第" + i + "项"));    }    adapter.setItem(datas);}

}

package com.jackeysun.touchpullview;import android.content.Context;/** * Created by jackey on 2017/7/23. */public class MyAdapter extends AbsAdapter<String, MyViewHolder> {    public MyAdapter(Context context, int layoutId) {        super(context, layoutId);    }    @Override    protected void initData(String datas, MyViewHolder viewHolder) {        viewHolder.textView.setText(datas);    }    @Override    public MyViewHolder newViewHolder() {        return new MyViewHolder();    }}

package com.jackeysun.touchpullview;import android.view.View;import android.widget.TextView;/** * Created by jackey on 2017/7/23. */public class MyViewHolder extends AbsViewHolder {    protected TextView textView;    public MyViewHolder() {    }    @Override    public void initItemView(View containerView) {        textView = (TextView) containerView.findViewById(R.id.textView);    }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.jackeysun.touchpullview.MainActivity">    <Button        android:layout_width="match_parent"        android:layout_height="48dp"        android:onClick="click"        android:text="显示数据"/>    <ListView        android:id="@+id/listView"        android:layout_width="wrap_content"        android:layout_height="0dp"        android:layout_weight="1"        android:divider="#999"        android:dividerHeight="1dp"></ListView></LinearLayout>

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