复现Android中GridView的bug并办理
几年前的一个bug，GridView的item高度差别等。如下图：https://i-blog.csdnimg.cn/direct/6c1a8c477f8b4265befdb120a1f01358.png 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>
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