几年前的一个bug,GridView的item高度差别等。如下图:
复现bug的代码:
- import android.os.Bundle;
- import android.widget.BaseAdapter;
- import android.widget.GridView;
- import androidx.appcompat.app.AppCompatActivity;
- import java.util.ArrayList;
- public class MainActivity extends AppCompatActivity {
- private GridView grid_photo;
- private BaseAdapter mAdapter = null;
- private ArrayList<String> mData = null;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- grid_photo = (GridView) findViewById(R.id.grid_photo);
- mData = new ArrayList<String>();
- mData.add( "鸡腿汉堡 x 1");
- mData.add( "韩国牛排(7分熟、不放辣)x 3");
- mData.add( "小杯可乐");
- mData.add( "薯条");
- mData.add( "冰淇淋");
- mData.add( "红茶");
- mData.add( "披萨");
- mAdapter = new MyAdapter<String>(mData, R.layout.item_grid_icon) {
- @Override
- public void bindView(ViewHolder holder, String obj) {
- holder.setText(R.id.txt_icon, obj);
- }
- };
- grid_photo.setAdapter(mAdapter);
- }
- }
- //activity_main.xml
- <RelativeLayout 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"
- android:padding="5dp"
- tools:context=".MainActivity">
- <!--numColumns设置每行显示多少个-->
- <GridView
- android:id="@+id/grid_photo"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:horizontalSpacing="2dp"
- android:verticalSpacing="2dp"
- android:gravity="center"
- android:numColumns="2" />
- </RelativeLayout>
- //MyAdapter.java
- import android.content.Context;
- import android.util.SparseArray;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.BaseAdapter;
- import android.widget.ImageView;
- import android.widget.TextView;
- import java.util.ArrayList;
- public abstract class MyAdapter<T> extends BaseAdapter {
- private ArrayList<T> mData;
- private int mLayoutRes; //布局id
- public MyAdapter() {
- }
- public MyAdapter(ArrayList<T> mData, int mLayoutRes) {
- this.mData = mData;
- this.mLayoutRes = mLayoutRes;
- }
- @Override
- public int getCount() {
- return mData != null ? mData.size() : 0;
- }
- @Override
- public T getItem(int position) {
- return mData.get(position);
- }
- @Override
- public long getItemId(int position) {
- return position;
- }
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- ViewHolder holder = ViewHolder.bind(parent.getContext(), convertView, parent, mLayoutRes
- , position);
- bindView(holder, getItem(position));
- return holder.getItemView();
- }
- public abstract void bindView(ViewHolder holder, T obj);
-
- public static class ViewHolder {
- private SparseArray<View> mViews; //存储ListView 的 item中的View
- private View item; //存放convertView
- private int position; //游标
- private Context context; //Context上下文
- //构造方法,完成相关初始化
- private ViewHolder(Context context, ViewGroup parent, int layoutRes) {
- mViews = new SparseArray<>();
- this.context = context;
- View convertView = LayoutInflater.from(context).inflate(layoutRes, parent, false);
- convertView.setTag(this);
- item = convertView;
- }
- //绑定ViewHolder与item
- public static ViewHolder bind(Context context, View convertView, ViewGroup parent,
- int layoutRes, int position) {
- ViewHolder holder;
- if (convertView == null) {
- holder = new ViewHolder(context, parent, layoutRes);
- } else {
- holder = (ViewHolder) convertView.getTag();
- holder.item = convertView;
- }
- holder.position = position;
- return holder;
- }
- @SuppressWarnings("unchecked")
- public <T extends View> T getView(int id) {
- T t = (T) mViews.get(id);
- if (t == null) {
- t = (T) item.findViewById(id);
- mViews.put(id, t);
- }
- return t;
- }
- /**
- * 设置文字
- */
- public ViewHolder setText(int id, CharSequence text) {
- View view = getView(id);
- if (view instanceof TextView) {
- ((TextView) view).setText(text);
- }
- return this;
- }
- }
- }
- //item_grid_icon.xml
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:background="#00ff00"
- android:padding="5dp">
- <TextView
- android:id="@+id/txt_icon"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_centerVertical="true"
- android:layout_centerHorizontal="true"
- android:layout_marginTop="30dp"
- android:text="呵呵"
- android:textSize="18sp" />
- </RelativeLayout>
复制代码 下一篇:android Gridview item高度顺应行最大高度问题,讲办理方案。
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