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本篇内容介绍了“Android如何自定义ViewGroup实现朋友圈九宫格控件”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
一、简介
1.1、效果图如下
1.2、主要功能如下
二、使用
2.1、自定义属性如下
2.2、布局中使用自定义NineImageLayout
2.3、Adapter方式绑定数据和UI
2.4、列表里面使用
三、源码地址
最近项目里有个类似微信朋友圈的九图控件的需求,Github找了一下,发现都不太满足需求,我需要单张图片的时候可以按照图片宽高比列在一定范围内自适应,而大多开源项目单张图片也是一个小正方形,所以,干脆自己动手写一个
1:单张图片的时候支持按照图片宽高比列在设定区域内自适应
2:Adapter方式绑定数据和UI
3:图片点击事件回调
4:设置图片间隔大小
5:自由通过Glide设置ImageView圆角效果
<resources> <declare-styleable name="NineImageLayout"> <!-- 控件宽高 --> <attr name="nine_layoutWidth" format="dimension"/> <!-- 单张图片时的最大宽高范围--> <attr name="nine_singleImageWidth" format="dimension" /> <!-- 图片之间间隙大小 --> <attr name="nine_imageGap" format="dimension" /> </declare-styleable> </resources>
<com.cyq.customview.nineLayout.view.NineImageLayout android:id="@+id/nine_image_layout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/tv_title" android:layout_marginTop="20dp" app:nine_imageGap="4dp" app:nine_layoutWidth="300dp" app:nine_singleImageWidth="180dp" />
其中Glide.asBitmap是为了计算图片宽高,如果后台有返回图片的宽高可以省略这一步,直接setSingleImage(width, height,imageView),
Ps:如果可以建议后台返回图片宽高,这样可以避免单张图片的时候控件高度跳屏,比如我限制单张图片宽高在200dp范围,要展示宽1000px高500px的时候,在图片未加载完成时控件宽高为200dp,图片加载完成后高度变为100dp,会有一个不好的用户体验,所以建议上传图片的时候记录图片宽高信息
nineImageLayout.setAdapter(new NineImageAdapter() { @Override protected int getItemCount() { return mData.size(); } @Override protected View createView(LayoutInflater inflater, ViewGroup parent, int i) { return inflater.inflate(R.layout.item_img_layout, parent, false); } @Override protected void bindView(View view, final int i) { final ImageView imageView = view.findViewById(R.id.iv_img); Glide.with(mContext).load(mData.get(i)).into(imageView); if (mData.size() == 1) { Glide.with(mContext) .asBitmap() .load(mData.get(0)) .into(new SimpleTarget<Bitmap>() { @Override public void onResourceReady(Bitmap bitmap, Transition<? super Bitmap> transition) { final int width = bitmap.getWidth(); final int height = bitmap.getHeight(); nineImageLayout.setSingleImage(width, height,imageView); } }); Glide.with(mContext).load(mData.get(0)).into(imageView); } else { Glide.with(mContext).load(mData.get(i)).into(imageView); } } @Override public void OnItemClick(int i, View view) { super.OnItemClick(position, view); Toast.makeText(mContext, "position:" + mData.get(i), Toast.LENGTH_SHORT).show(); } });
页面放一个RecyclerView
<FrameLayout 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" tools:context=".nineLayout.NineImageLayoutActivity"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/recyclerview" android:layout_width="match_parent" android:layout_height="wrap_content" /> </FrameLayout>
item布局如下
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="20dp"> <TextView android:id="@+id/tv_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="标题" android:textColor="@android:color/black" android:textSize="18sp" /> <com.cyq.customview.nineLayout.view.NineImageLayout android:id="@+id/nine_image_layout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/tv_title" android:layout_marginTop="20dp" app:nine_imageGap="4dp" app:nine_layoutWidth="300dp" app:nine_singleImageWidth="180dp" /> </RelativeLayout>
Activity中构造一下测试数据,大致代码如下
public class NineImageLayoutActivity extends AppCompatActivity { private RecyclerView mRecyclerView; private MyAdapter mAdapter; private Random random; private final String URL_IMG = "http://q3x62hkt1.bkt.clouddn.com/banner/58f57dfa5bb73.jpg"; private final String URL_IMG_2 = "http://q3x62hkt1.bkt.clouddn.com/timg.jpeg"; private List<List<String>> mList = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_nine_image_layout); random = new Random(); List<String> testList = new ArrayList<>(); testList.add(URL_IMG_2); for (int i = 0; i < 100; i++) { int count = i % 9 + 1; List<String> list = new ArrayList<>(); for (int j = 0; j < count; j++) { list.add(URL_IMG); } if (i % 8 == 0) { mList.add(testList); } mList.add(list); } mRecyclerView = findViewById(R.id.recyclerview); mAdapter = new MyAdapter(mList, this); mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); mRecyclerView.setAdapter(mAdapter); } }
MyAdapter中设置数据
import java.util.List; /** * @author : ChenYangQi * date : 2020/1/16 13:49 * desc : */ public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> { private List<List<String>> mList; private Context mContext; public MyAdapter(List<List<String>> mList, Context mContext) { this.mList = mList; this.mContext = mContext; } @NonNull @Override public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(mContext).inflate(R.layout.item_nine_img_layout_list, parent, false); return new MyViewHolder(view); } @Override public void onBindViewHolder(@NonNull final MyViewHolder holder, final int position) { final List<String> mData = mList.get(position); holder.tvTitle.setText("这是" + mData.size() + "张图片的标题"); final NineImageLayout nineImageLayout = holder.nineImageLayout; holder.nineImageLayout.setAdapter(new NineImageAdapter() { @Override protected int getItemCount() { return mData.size(); } @Override protected View createView(LayoutInflater inflater, ViewGroup parent, int i) { return inflater.inflate(R.layout.item_img_layout, parent, false); } @Override protected void bindView(View view, final int i) { final ImageView imageView = view.findViewById(R.id.iv_img); Glide.with(mContext).load(mData.get(i)).into(imageView); if (mData.size() == 1) { Glide.with(mContext) .asBitmap() .load(mData.get(0)) .into(new SimpleTarget<Bitmap>() { @Override public void onResourceReady(Bitmap bitmap, Transition<? super Bitmap> transition) { final int width = bitmap.getWidth(); final int height = bitmap.getHeight(); nineImageLayout.setSingleImage(width, height,imageView); } }); Glide.with(mContext).load(mData.get(0)).into(imageView); } else { Glide.with(mContext).load(mData.get(i)).into(imageView); } } @Override public void OnItemClick(int i, View view) { super.OnItemClick(position, view); Toast.makeText(mContext, "position:" + mData.get(i), Toast.LENGTH_SHORT).show(); } }); } @Override public int getItemCount() { return mList.size(); } class MyViewHolder extends RecyclerView.ViewHolder { TextView tvTitle; NineImageLayout nineImageLayout; public MyViewHolder(@NonNull View itemView) { super(itemView); tvTitle = itemView.findViewById(R.id.tv_title); nineImageLayout = itemView.findViewById(R.id.nine_image_layout); } } }
具体自定义NineImageLayout过程,可以查看NineImageLayout
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