在开发过程中，经常会需要动态的向 ViewGroup 控件中添加 子布局 通过循环 addView()的形式来完成操作 ，当一个项目中有很多这样的情景时，出现了很多重复的代码，这时就考虑到将其进行封装
ViewGroupAdapter 动态的向Viewgroup添加布局，采用adapter 适配器模式
在开发过程中，经常会需要动态的向 ViewGroup 控件中添加 子布局 通过循环 addView()的形式来完成操作
类似于这样的界面，一个横向滑动的视图，外层控件使用的是 HorizontalScrollView 子布局为 LinearLayout
示例
布局代码如下：
<?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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.xxh.viewgroupadapter.demo.MainActivity">
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<LinearLayout
android:id="@+id/ll_horizontal"
android:layout_width="wrap_content"
android:orientation="horizontal"
android:layout_height="wrap_content"></LinearLayout>
</HorizontalScrollView>
<Button
android:text="测试刷新"
android:onClick="textRefresh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
每一个item子视图的layout如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="160dp"
android:layout_height="300dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:gravity="center_horizontal"
android:orientation="vertical">
<ImageView
android:id="@+id/iv_icon"
android:layout_width="150dp"
android:layout_height="220dp"
android:scaleType="centerCrop"/>
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="测试文本"/>
<Button
android:id="@+id/btn_test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="点击我"/>
</LinearLayout>
接着就是向ll_horizontal控件中添加子View
public void bindViews(){
LayoutInflater layoutInflater = LayoutInflater.from(this);
for(int i = 0; i < mDatas.size(); i++) {
TestBean item = mDatas.get(i);
//初始化视图
View view = layoutInflater.inflate(R.layout.item_horizontal,ll_horizontal,false);
//初始化操作控件
ImageView iv_icon = (ImageView) view.findViewById(R.id.iv_icon);
TextView tv_title = (TextView) view.findViewById(R.id.tv_title);
Button btn_test = (Button) view.findViewById(R.id.btn_test);
//绑定数据
iv_icon.setImageResource(item.getImageId());
tv_title.setText(item.getName());
//点击事件
btn_test.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
//item 的点击事件
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
//item 的长按事件
view.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
return false;
}
});
}
}
看似这段代码没什么问题，但是如果 Item 中有多个控件需要绑定数据，绑定点击事件，就需要我们写很多重复的 代码，本着打死不重复的原则，对其进行封装
参考List View 的形式进行Adapter 封装，三个角色 ：ViewGroup控件，Adapter ,ViewHolder
Adapter 提供 数据与视图的绑定，ViewHolder 提供视图的创建和视图的基本操作
Adapter 父类接口为：
public interface IViewGroupAdapter {
View getView(ViewGroup parent, int pos); //获取视图
int getCount(); //获取数据 count
void notifyDatasetChanged();
void registerDataSetObserver(DataSetObserver dataSetObserver);
void unregisterDataSetObserver(DataSetObserver dataSetObserver);
}
实现类BaseAdapter代码如下：
public abstract class BaseAdapter<T> implements IViewGroupAdapter {
protected List<T> mDatas; //数据源
protected Context mContext;
protected DataSetObservable mDataSetObservable;
private int mItemViewId; //layoutId
ViewGroup mParent; //需要绑定的ViewGroup对象
OnItemClickListener mOnItemClickListener;
OnItemLongClickListener mOnItemLongClickListener;
DataSetObserver mDataSetObserver = new DataSetObserver() {
@Override
public void onChanged() {
//数据源发生变化时，刷新界面
refreshUI();
}
@Override
public void onInvalidated() {
}
};
public BaseAdapter(Context context, List<T> datas, int itemViewId) {
mDatas = datas;
mContext = context;
this.mItemViewId = itemViewId;
mDataSetObservable = new DataSetObservable();
}
@Override
public void notifyDatasetChanged() {
mDataSetObservable.notifyChanged();
}
@Override
public void registerDataSetObserver(DataSetObserver dataSetObserver) {
mDataSetObservable.registerObserver(dataSetObserver);
}
@Override
public void unregisterDataSetObserver(DataSetObserver dataSetObserver) {
mDataSetObservable.unregisterObserver(dataSetObserver);
}
/**
* 获取视图
*
* @param parent
* @param pos
* @return
*/
@Override
public View getView(ViewGroup parent, int pos) {
//实现getView
ViewHolder holder = onCreateViewHolder(parent, pos);
convert(parent, holder, mDatas.get(pos), pos);
return holder.itemView;
}
protected abstract void convert(ViewGroup parent, ViewHolder holder, T item, int pos);
private ViewHolder onCreateViewHolder(ViewGroup parent, int pos) {
return ViewHolder.carateViewHolder(mContext, parent, mItemViewId, pos);
}
/**
* ViewGroup调用，得到ItemCount
*
* @return
*/
@Override
public int getCount() {
return mDatas != null ? mDatas.size() : 0;
}
public List<T> getDatas() {
return mDatas;
}
public BaseAdapter setDatas(List<T> datas) {
mDatas = datas;
notifyDatasetChanged();
return this;
}
public void bindViews(ViewGroup parent) {
this.mParent = parent;
mDataSetObservable.unregisterAll();
mParent = parent;
registerDataSetObserver(mDataSetObserver);
refreshUI();
}
private BaseAdapter<T> refreshUI() {
if (mParent == null ) {
return this;
}
mParent.removeAllViews();
int count = getCount();
for (int i = 0; i < count; i++) {
final View itemView = getView(mParent, i);
mParent.addView(itemView);
itemView.setTag(i);
if (null != mOnItemClickListener) {
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Integer tag = (Integer) v.getTag();
mOnItemClickListener.onItemClick(mParent,v,tag);
}
});
}
if (null != mOnItemLongClickListener) {
itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
Integer tag = (Integer) v.getTag();
return mOnItemLongClickListener.onItemLongClick(mParent,v,tag);
}
});
}
}
return this;
}
public BaseAdapter<T> setOnItemClickListener(OnItemClickListener onItemClickListener) {
mOnItemClickListener = onItemClickListener;
return this;
}
public BaseAdapter<T> setOnItemLongClickListener(OnItemLongClickListener onItemLongClickListener) {
mOnItemLongClickListener = onItemLongClickListener;
return this;
}
}
ViewHolder代码如下：
public class ViewHolder {
public View itemView;
private SparseArray<View> mChilds;
private Context mContext;
public static ViewHolder carateViewHolder(Context context, ViewGroup parent, int itemViewId, int pos){
return new ViewHolder( context, parent, itemViewId, pos);
}
public ViewHolder(Context context, ViewGroup parent, int itemViewId, int pos) {
this.mContext = context;
this.mChilds = new SparseArray<>();
itemView = LayoutInflater.from(context).inflate(itemViewId, parent, false);
}
public <V extends View> V findViewById(int id) {
return getView(id);
}
public <V extends View> V getView(int id) {
View child = mChilds.get(id);
if (child == null) {
child = itemView.findViewById(id);
mChilds.put(id, child);
}
return (V) child;
}
//-------------------------------------------------------分割线-----------------------------------------------------------------------
//--------------------------------------------------以下的代码与逻辑无关，提供了视图的基本操作---------------------------------------------
/**
* 设置TextView的值
*
* @param viewId
* @param text
* @return
*/
public ViewHolder setText(int viewId, CharSequence text) {
TextView tv = getView(viewId);
tv.setText(text);
return this;
}
public ViewHolder setSelected(int viewId, boolean selected) {
View v = getView(viewId);
v.setSelected(selected);
return this;
}
public ViewHolder setImageResource(int viewId, int resId) {
ImageView view = getView(viewId);
view.setImageResource(resId);
return this;
}
public ViewHolder setImageBitmap(int viewId, Bitmap bitmap) {
ImageView view = getView(viewId);
view.setImageBitmap(bitmap);
return this;
}
public ViewHolder setImageDrawable(int viewId, Drawable drawable) {
ImageView view = getView(viewId);
view.setImageDrawable(drawable);
return this;
}
public ViewHolder setBackgroundColor(int viewId, int color) {
View view = getView(viewId);
view.setBackgroundColor(color);
return this;
}
public ViewHolder setBackgroundRes(int viewId, int backgroundRes) {
View view = getView(viewId);
view.setBackgroundResource(backgroundRes);
return this;
}
public ViewHolder setTextColor(int viewId, int textColor) {
TextView view = getView(viewId);
view.setTextColor(textColor);
return this;
}
public ViewHolder setTextColorRes(int viewId, int textColorRes) {
TextView view = getView(viewId);
view.setTextColor(itemView.getContext().getResources().getColor(textColorRes));
return this;
}
@SuppressLint("NewApi")
public ViewHolder setAlpha(int viewId, float value) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getView(viewId).setAlpha(value);
} else {
// Pre-honeycomb hack to set Alpha value
AlphaAnimation alpha = new AlphaAnimation(value, value);
alpha.setDuration(0);
alpha.setFillAfter(true);
getView(viewId).startAnimation(alpha);
}
return this;
}
public ViewHolder setVisible(int viewId, boolean visible) {
View view = getView(viewId);
view.setVisibility(visible ? View.VISIBLE : View.GONE);
return this;
}
public ViewHolder linkify(int viewId) {
TextView view = getView(viewId);
Linkify.addLinks(view, Linkify.ALL);
return this;
}
public ViewHolder setTypeface(Typeface typeface, int... viewIds) {
for (int viewId : viewIds) {
TextView view = getView(viewId);
view.setTypeface(typeface);
view.setPaintFlags(view.getPaintFlags() | Paint.SUBPIXEL_TEXT_FLAG);
}
return this;
}
public ViewHolder setProgress(int viewId, int progress) {
ProgressBar view = getView(viewId);
view.setProgress(progress);
return this;
}
public ViewHolder setProgress(int viewId, int progress, int max) {
ProgressBar view = getView(viewId);
view.setMax(max);
view.setProgress(progress);
return this;
}
public ViewHolder setMax(int viewId, int max) {
ProgressBar view = getView(viewId);
view.setMax(max);
return this;
}
public ViewHolder setRating(int viewId, float rating) {
RatingBar view = getView(viewId);
view.setRating(rating);
return this;
}
public ViewHolder setRating(int viewId, float rating, int max) {
RatingBar view = getView(viewId);
view.setMax(max);
view.setRating(rating);
return this;
}
public ViewHolder setTag(int viewId, Object tag) {
View view = getView(viewId);
view.setTag(tag);
return this;
}
public ViewHolder setTag(int viewId, int key, Object tag) {
View view = getView(viewId);
view.setTag(key, tag);
return this;
}
public ViewHolder setChecked(int viewId, boolean checked) {
Checkable view = (Checkable) getView(viewId);
view.setChecked(checked);
return this;
}
/**
* 关于事件的
*/
public ViewHolder setOnClickListener(int viewId,
View.OnClickListener listener) {
View view = getView(viewId);
view.setOnClickListener(listener);
return this;
}
public ViewHolder setOnTouchListener(int viewId,
View.OnTouchListener listener) {
View view = getView(viewId);
view.setOnTouchListener(listener);
return this;
}
public ViewHolder setOnLongClickListener(int viewId,
View.OnLongClickListener listener) {
View view = getView(viewId);
view.setOnLongClickListener(listener);
return this;
}
}
封装过后使用的代码如下：
mBaseAdapter = new BaseAdapter<TestBean>(this, mDatas, R.layout.item_horizontal) {
@Override
protected void convert(ViewGroup parent, ViewHolder holder, TestBean item, final int pos) {
holder.setImageResource(R.id.iv_icon, item.getImageId())
.setText(R.id.tv_title, item.getName())
.setOnClickListener(R.id.btn_test, new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "按钮点击事件：" + pos, Toast.LENGTH_SHORT).show();
}
});
}
};
mBaseAdapter.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(ViewGroup parent, View itemView, int position) {
Toast.makeText(MainActivity.this, "Item 的点击事件", Toast.LENGTH_SHORT).show();
}
}).setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(ViewGroup parent, View itemView, int position) {
Toast.makeText(MainActivity.this, "Item的长按事件", Toast.LENGTH_SHORT).show();
return true;
}
}).bindViews(ll_horizontal);
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