【移动应用开发技术】Android中如何使用Adapter工具类

【移动应用开发技术】Android中如何使用Adapter工具类

这篇文章给大家介绍Android中如何使用Adapter工具类，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。Adapter是连接后端数据和前端显示的适配器接口，是数据和UI（View）之间一个重要的纽带。在常见的View(ListView,GridView)等地方都需要用到Adapter。每个开发工程师都会有自己的一些常用到的工具类，今天我分享一下我自己总结的关于Adapter的工具类，话不多说直接上代码CommonAdapter：public

abstract

class

CommonAdapter<T>

extends

BaseAdapter

{

protected

LayoutInflater

mInflater;

protected

Context

mContext;

protected

List<T>

mDatas;

protected

final

int

mItemLayoutId;

public

CommonAdapter(Context

context,

List<T>

mDatas,

int

itemLayoutId)

{

this.mContext

=

context;

this.mInflater

=

LayoutInflater.from(mContext);

this.mDatas

=

mDatas;

this.mItemLayoutId

=

itemLayoutId;

}

@Override

public

int

getCount()

{

return

mDatas.size();

}

@Override

public

T

getItem(int

position)

{

return

mDatas.get(position);

}

@Override

public

long

getItemId(int

position)

{

return

position;

}

@Override

public

View

getView(int

position,

View

convertView,

ViewGroup

parent)

{

final

ViewHolder

viewHolder

=

getViewHolder(position,

convertView,

parent);

convert(viewHolder,

getItem(position)

,

position);

return

viewHolder.getConvertView();

}

public

abstract

void

convert(ViewHolder

helper,

T

item

,

int

postion);

private

ViewHolder

getViewHolder(int

position,

View

convertView,

ViewGroup

parent)

{

return

ViewHolder.get(mContext,

convertView,

parent,

mItemLayoutId,

position);

}

}ViewHolder：public

class

ViewHolder

{

private

final

SparseArray<View>

mViews;

private

int

mPosition;

private

View

mConvertView;

private

ViewHolder(Context

context,

ViewGroup

parent,

int

layoutId,

int

position)

{

this.mPosition

=

position;

this.mViews

=

new

SparseArray<View>();

mConvertView

=

LayoutInflater.from(context).inflate(layoutId,

parent,

false);

//

setTag

mConvertView.setTag(this);

}

/**

*

拿到ViewHolder对象

*

*

@param

context

*

@param

convertView

*

@param

parent

*

@param

layoutId

*

@param

position

*

@return

*/

public

static

ViewHolder

get(Context

context,

View

convertView,

ViewGroup

parent,

int

layoutId,

int

position)

{

ViewHolder

holder

=

null;

if

(convertView

==

null)

{

holder

=

new

ViewHolder(context,

parent,

layoutId,

position);

}

else

{

holder

=

(ViewHolder)

convertView.getTag();

holder.mPosition

=

position;

}

return

holder;

}

public

View

getConvertView()

{

return

mConvertView;

}

/**

*

通过控件的Id获取对于的控件，如果没有则加入views

*

*

@param

viewId

*

@return

*/

public

<T

extends

View>

T

getView(int

viewId)

{

View

view

=

mViews.get(viewId);

if

(view

==

null)

{

view

=

mConvertView.findViewById(viewId);

mViews.put(viewId,

view);

}

return

(T)

view;

}

/**

*

为TextView设置字符串

*

*

@param

viewId

*

@param

text

*

@return

*/

public

ViewHolder

setText(int

viewId,

String

text)

{

TextView

view

=

getView(viewId);

view.setText(text);

return

this;

}

/**

*

为ImageView设置图片

*

*

@param

viewId

*

@param

drawableId

*

@return

*/

public

ViewHolder

setImageResource(int

viewId,

int

drawableId)

{

ImageView

view

=

getView(viewId);

view.setImageResource(drawableId);

return

this;

}

/**

*

为ImageView设置图片

*

*

@param

viewId

*

@param

drawableId

*

@return

*/

public

ViewHolder

setImageBitmap(int

viewId,

Bitmap

bm)

{

ImageView

view

=

getView(viewId);

view.setImageBitmap(bm);

return

this;

}

/**

*

通过图片路径为ImageView设置图片

*

@param

viewId

*

@param

drawableId

*

@return

*/

public

ViewHolder

setImageByUrl(int

viewId,

String

url)

{

ImageLoader.getInstance(3,Type.LIFO).loadImage(url,

(ImageView)

getView(viewId));

return

this;

}

public

int

getPosition()

{

return

mPosition;

}

}MyAdapter：public

class

MyAdapter

extends

CommonAdapter<String>

{

private

List<String>

mData

;

public

MyAdapter(Context

context,

List<String>

mDatas,

int

itemLayoutId)

{

super(context,

mDatas,

itemLayoutId);

this.mDatas

=

mDatas

;

}

@Override

public

void

convert(final

ViewHolder

helper,

final

String

item

,

int

postion)

{

/**

*

第一种

*/

helper.setImageResource(R.id.item_ib01,

R.drawable.ic_launcher);

helper.setImageResource(R.id.item_iv01,

R.drawable.ic_launcher);

helper.setText(R.id.item_tv01,

"我是第"+mDatas.get(postion)+"个")

;

//

通过路径设置图片

//

helper.setImageByUrl(R.id.id_item_image,

mDirPath

+

"/"

+

item);

/*

*

第二种

*/

/*

*

final

ImageView

item_iv

=

helper.getView(R.id.item_iv01);

final

ImageButton

item_ib

=

helper.getView(R.id.item_ib01);

TextView

item_tv

=

helper.getView(R.id.item_tv01)

;

item_tv.s