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在Android中,要實(shí)現(xiàn)ListView多列顯示,可以使用GridView或者RecyclerView。這里我將為您提供兩種方法的實(shí)現(xiàn):
首先,在布局文件(例如activity_main.xml)中添加GridView:
android:id="@+id/gridView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:numColumns="auto_fit"
android:columnWidth="100dp"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp" />
然后,創(chuàng)建一個(gè)適配器(例如MyAdapter.java):
public class MyAdapter extends BaseAdapter {
private Context context;
private List<String> dataList;
public MyAdapter(Context context, List<String> dataList) {
this.context = context;
this.dataList = dataList;
}
@Override
public int getCount() {
return dataList.size();
}
@Override
public Object getItem(int position) {
return dataList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.grid_item, parent, false);
}
TextView textView = convertView.findViewById(R.id.textView);
textView.setText(dataList.get(position));
return convertView;
}
}
接下來(lái),在MainActivity.java中設(shè)置適配器:
GridView gridView = findViewById(R.id.gridView);
List<String> dataList = new ArrayList<>();
for (int i = 0; i < 20; i++) {
dataList.add("Item " + i);
}
MyAdapter adapter = new MyAdapter(this, dataList);
gridView.setAdapter(adapter);
首先,在build.gradle中添加RecyclerView依賴(lài):
implementation 'com.android.support:recyclerview-v7:28.0.0'
然后,在布局文件(例如activity_main.xml)中添加RecyclerView:
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
接下來(lái),創(chuàng)建一個(gè)適配器(例如MyAdapter.java):
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private Context context;
private List<String> dataList;
public MyAdapter(Context context, List<String> dataList) {
this.context = context;
this.dataList = dataList;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.grid_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
holder.textView.setText(dataList.get(position));
}
@Override
public int getItemCount() {
return dataList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView textView;
public ViewHolder(View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.textView);
}
}
}
最后,在MainActivity.java中設(shè)置適配器:
RecyclerView recyclerView = findViewById(R.id.recyclerView);
GridLayoutManager layoutManager = new GridLayoutManager(this, 3);
recyclerView.setLayoutManager(layoutManager);
List<String> dataList = new ArrayList<>();
for (int i = 0; i < 20; i++) {
dataList.add("Item " + i);
}
MyAdapter adapter = new MyAdapter(this, dataList);
recyclerView.setAdapter(adapter);
這樣,您就可以實(shí)現(xiàn)ListView多列顯示了。注意,這里的示例代碼僅供參考,您可能需要根據(jù)自己的需求進(jìn)行調(diào)整。
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