Android studio 微信APP之Fragment中使用ReclerView
如題,本次實驗的內容就是在已經創建好的微信程序的首頁處,在fragment控件中增加ReclerView控件,實現首頁內容的多樣化(微信首頁的製作參考:微信程序首頁)
首先還是對佈局進行一個說明:
在fragment對應的layout中添加ReclerView控件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#BBBBBB"/>
</LinearLayout>
這一步僅僅是將控件添加到fragment中,而並沒有對ReclerView進行佈局。
因此,我們還要對ReclerView進行佈局
ReclerView的佈局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffffff">
<!--左側的圖片佈局盒子-->
<LinearLayout
android:id="@+id/ll_1"
android:layout_width="wrap_content"
android:layout_height="125dp"
android:gravity="center">
<ImageView
android:id="@+id/item_goods_img"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_margin="10dp"
android:src="@mipmap/picture1"
android:background="#4D2BD5"/>
</LinearLayout>
<!--右側文字盒子佈局-->
<LinearLayout
android:id="@+id/ll_2"
android:layout_width="match_parent"
android:layout_height="125dp"
android:orientation="vertical">
<!--名字TextView所在盒子佈局-->
<LinearLayout
android:id="@+id/ll_2_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginBottom="10dp">
<TextView
android:id="@+id/item_goods_nametitle"
android:layout_width="90dp"
android:layout_height="25dp"
android:text=""
android:textSize="16sp"
android:textColor="#000000" />
<TextView
android:id="@+id/item_goods_name"
android:layout_width="190dp"
android:layout_height="25dp"
android:text=""
android:textSize="20sp"
android:textColor="#000000" />
</LinearLayout>
<!--價格TextView所在盒子佈局-->
<LinearLayout
android:id="@+id/ll_2_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp">
<TextView
android:id="@+id/item_goods_pricetitle"
android:layout_width="90dp"
android:layout_height="25dp"
android:text=""
android:textSize="16sp"
android:textColor="#000000" />
<TextView
android:id="@+id/item_goods_price"
android:layout_width="190dp"
android:layout_height="25dp"
android:text=""
android:textSize="20sp"
android:textColor="#000000" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
接下來就是對控件的函數控制了
首先,我們需要爲需要引用的數據建立一個類,來提供數據修改的接口
GoodsEntity.java:
class GoodsEntity implements Serializable {
public String imgPath;//圖片地址
public String goodsName;//貨物名稱
public String goodsPrice;//貨物價格
public String goodsNameTitle;//商品名稱標籤
public String goodsPriceTitle;//商品價格標籤
public GoodsEntity() {
}
public GoodsEntity(String imgPath, String goodsName, String goodsPrice,String goodsNameTitle,String goodsPriceTitle) {
this.imgPath = imgPath;
this.goodsName = goodsName;
this.goodsPrice = goodsPrice;
this.goodsNameTitle = goodsNameTitle;
this.goodsPriceTitle = goodsPriceTitle;
}
//圖片的路徑獲取方法
public String getImgPath() {
return imgPath;
}
public void setImgPath(String imgPath) {
this.imgPath = imgPath;
}
//商品名字的獲取方法
public String getGoodsName() {
return goodsName;
}
public void setGoodsName(String goodsName) {
this.goodsName = goodsName;
}
//商品名字標籤的獲取方法
public String getGoodsNameTitle(){
return goodsNameTitle;
}
public void setGoodsNameTitle(String goodsNameTitle){
this.goodsNameTitle = goodsNameTitle;
}
//商品價格標籤的獲取方法
public String getGoodsPriceTitle(){
return goodsPriceTitle;
}
public void setGoodsPriceTitle(String goodsPriceTitle){
this.goodsPriceTitle = goodsPriceTitle;
}
//商品價格的獲取方法
public String getGoodsPrice() {
return goodsPrice;
}
public void setGoodsPrice(String goodsPrice) {
this.goodsPrice = goodsPrice;
}
@Override
public String toString() {
return "GoodsEntity{" +
"imgPath='" + imgPath + '\'' +
", goodsName='" + goodsName + '\'' +
", goodsNameTitle='" + goodsNameTitle + '\'' +
", goodsPrice='" + goodsPrice + '\'' +
", goodsPriceTitle='" + goodsPriceTitle + '\'' +
'}';
}
}
沒有什麼好說的,就是定義變量,get變量,set變量,別命名錯了就行了
隨後,便是重點,我們要創建ReclerView的adapter了
(也就是這裏,我們可以控制ReclerView的展現形式,我這裏採用的最簡單的線性排布)
LinearAdapter:
class LinearAdapter extends RecyclerView.Adapter<LinearAdapter.myViewHolder> {
private OnItemClickListener onItemClickListener;
private Context context;
private ArrayList<GoodsEntity> goodsEntities;
public LinearAdapter(Context context,ArrayList<GoodsEntity> goodsEntities){
this.context = context;
this.goodsEntities = goodsEntities;
}
@NonNull
@Override
public LinearAdapter.myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View itemView = View.inflate(context, R.layout.layout_linear_item,null);
return new myViewHolder(itemView);
}
@Override
public void onBindViewHolder(@NonNull LinearAdapter.myViewHolder holder, int position) {
GoodsEntity data = goodsEntities.get(position);
holder.mItemGoodsName.setText(data.goodsName);
holder.mItemGoodsPrice.setText(data.goodsPrice);
holder.mItemGoodsNameTitle.setText(data.goodsNameTitle);
holder.mItemGoodsPriceTitle.setText(data.goodsPriceTitle);
}
@Override
public int getItemCount() {
return goodsEntities.size();
}
class myViewHolder extends RecyclerView.ViewHolder {
//定義控件
private ImageView mItemGoodsImg;
private TextView mItemGoodsName;
private TextView mItemGoodsPrice;
private TextView mItemGoodsNameTitle;
private TextView mItemGoodsPriceTitle;
public myViewHolder(@NonNull View itemView) {
super(itemView);
//找到控件
mItemGoodsImg = itemView.findViewById(R.id.item_goods_img);
mItemGoodsName = itemView.findViewById(R.id.item_goods_name);
mItemGoodsPrice = itemView.findViewById(R.id.item_goods_price);
mItemGoodsNameTitle = itemView.findViewById(R.id.item_goods_nametitle);
mItemGoodsPriceTitle = itemView.findViewById(R.id.item_goods_pricetitle);
//設置點擊事件
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListener!=null){
onItemClickListener.OnItemClick(v,goodsEntities.get(getLayoutPosition()));
}
}
});
}
}
//設置點擊事件監聽器
public interface OnItemClickListener {
public void OnItemClick(View view, GoodsEntity data);
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
}
最後就是對fragment的類的函數編寫
weixinFragment:
public class weixinFragment extends Fragment {
private RecyclerView mRvMain; //定義ReclerView控件
private View view;//定義view來設置fragment中的layout
private ArrayList<GoodsEntity> goodsEntities = new ArrayList<GoodsEntity>();
private LinearAdapter mLinearAdapter;
public weixinFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.tab01, container, false);
initRecyclerView();
initData();
return view;
}
//
private void initRecyclerView() {
mRvMain = (RecyclerView)view.findViewById(R.id.rv_main);
mLinearAdapter = new LinearAdapter(getActivity(),goodsEntities);
mRvMain.setAdapter(mLinearAdapter);
mRvMain.setLayoutManager(new LinearLayoutManager(getActivity(),LinearLayoutManager.VERTICAL,false));
mRvMain.addItemDecoration(new DividerItemDecoration(getActivity(),DividerItemDecoration.VERTICAL));
mLinearAdapter.setOnItemClickListener(new LinearAdapter.OnItemClickListener() {
@Override
public void OnItemClick(View view, GoodsEntity data) {
Toast.makeText(getActivity(),"圖片售罄",Toast.LENGTH_SHORT).show();
}
});
}
//
private void initData(){
for (int i=0;i<10;i++){
GoodsEntity goodsEntity = new GoodsEntity();
goodsEntity.setGoodsNameTitle(" 圖片名稱:");
goodsEntity.setGoodsName("圖片序號"+i);
goodsEntity.setGoodsPriceTitle(" 圖片價格:");
goodsEntity.setGoodsPrice("1"+i*100+"RMB");
goodsEntities.add(goodsEntity);
}
}
}
至此 大功告成,值得一提的是,在這個項目中,我設置的圖片是直接去一張圖片來顯示,也可以在fragment中設置文件路徑,然後我們對圖片的命名採用迭代的命名方式(就是img1、img2這樣子一直下去),然後在initData函數中使用goodsEntity.setImgPath("…/mipmap/"+i);的方式來一次獲取圖片。。。
但是圖片太難找了。。。emmm所以這裏就直接用一張圖片放上去意思一下算了
那麼最後,附上整個項目的源碼,需要的碼雲自取
碼雲倉庫