ListView封装

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;

@Override
protected 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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