如何解决如何在java中使用带有基本适配器android的网格视图创建3/2网格
6 网格应该不滚动显示,也就是说应该像为每个网格卡设置 layout_weight="1" & layout_height="1" 一样。
应显示 6 张卡片,分别对应屏幕大小。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<GridView
android:id="@+id/gvImages"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="3"
app:layout_constrainedHeight="true"
app:layout_constrainedWidth="true"
app:layout_constraintVertical_weight="1"
app:layout_constraintHorizontal_weight="1"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
grid_layout.xml
<?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="match_parent"
xmlns:tools="http://schemas.android.com/tools">
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="center"
tools:srcCompat="@tools:sample/avatars" />
</LinearLayout>
MyAdapter.java
package com.aijishnu.baseadaptersample;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import com.aijishnu.baseadaptersample.databinding.GridLayoutBinding;
public class MyAdapter extends BaseAdapter {
Context c;
int items[];
MyAdapter(Context c,int arr[]) {
this.c = c;
items = arr;
}
@Override
public int getCount() {
return items.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position,View convertView,ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
GridLayoutBinding itembinding = GridLayoutBinding.inflate(LayoutInflater.from(parent.getContext()),parent,false);
holder = new ViewHolder(itembinding);
holder.view = itembinding.getRoot();
holder.view.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.binding.imageView.setimageResource(items[position]);
return holder.view;
}
private static class ViewHolder {
private View view;
private GridLayoutBinding binding;
ViewHolder(GridLayoutBinding binding) {
this.view = binding.getRoot();
this.binding = binding;
}
}
}
MainActivity.java
package com.aijishnu.baseadaptersample;
import android.os.Bundle;
import com.aijishnu.baseadaptersample.databinding.ActivityMainBinding;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
ActivityMainBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
int[] itemsarray = new int[] {
R.drawable.ic_launcher_background,R.drawable.ic_launcher_foreground,R.drawable.ic_launcher_background,};
MyAdapter adapter = new MyAdapter(this,itemsarray);
binding.gvImages.setAdapter(adapter);
}
}
上面的代码结果是这样的,(这不适合屏幕高度,也有滚动选项,我想要 6 张卡片应该适合屏幕大小)
注意:这些卡应该使用 BaseAdapter 或 RecyclerAdapter 随机生成
解决方法
您可以在 xml 文件中设置 GridLayout 的行数和列数
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