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本文小编为大家详细介绍“Android怎么自定义ViewGroup实现朋友圈九宫格控件”,内容详细,步骤清晰,细节处理妥当,希望这篇“Android怎么自定义ViewGroup实现朋友圈九宫格控件”文章能帮助大家解决疑惑,下面跟着小编的思路慢慢深入,一起来学习新知识吧。
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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
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() { @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
item布局如下
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> mList = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_nine_image_layout); random = new Random(); List
testList = new ArrayList<>(); testList.add(URL_IMG_2); for (int i = 0; i < 100; i++) { int count = i % 9 + 1; List 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{ private List > mList; private Context mContext; public MyAdapter(List
> 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
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 () { @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); } } }
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