Android ListView (多个adapter 说明)

最近维护项目,项目里面使用的都是ListView 这里也对ListView 回顾一下

以下 demo 地址

ListView 在Android 里面用来实现列表的,

在xml 中创建ListView 代码如下

<?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"android:orientation="vertical"><ListViewandroid:id="@+id/listView"android:layout_width="match_parent"android:layout_height="match_parent" /></LinearLayout>

实现list 换需要适配器(Adapter) ,ListView常用的适配器(Adapter)有以下几种。

1 ArrayAdapter 绑定数组

2 SimpleAdapter 绑定xml 中对应的数据

3 SimpleCursorAdapter 绑定游标

4 BaseAdapter 通用的是适配器,(一般都是自定义)

1 ArrayAdapter 绑定数组

下面写一个demo

xml 使用上面的

java 代码如下

public class ArrayAdapterActivity extends AppCompatActivity {private String[] data = {"Android", "Java", "C++", "PHP", "Python", "JS", "HTML", "CSS"};@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.array_adapter_activity_layout);final ListView listView = findViewById(R.id.listView);final ArrayAdapter<String>adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,data);listView.setAdapter(adapter);listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {Toast.makeText(ArrayAdapterActivity.this, adapter.getItem(position),Toast.LENGTH_SHORT).show();}});}
}

实现效果

没有分割线,设置一下

        // 设置分割线listView.setDivider(new ColorDrawable(Color.RED));// 设置分割线的宽度listView.setDividerHeight(5);

设置之后的效果'

2 SimpleAdapter

java 代码如下

public class SimpleAdapterActivity extends AppCompatActivity {private String[] project = {"Android", "Java", "C++", "PHP", "Python", "JS", "HTML", "CSS"};private String[] dev = {"张三", "李四", "王二", "小赵", "小钱", "小孙", "小李", "小明"};@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.simple_adapter_activity_layout);ArrayList<Map<String, Object>> mData = new ArrayList<>();int lengh = project.length;for (int i = 0; i < lengh; i++) {Map<String, Object> item = new HashMap<>();item.put("project", project[i]);item.put("dev", dev[i]);mData.add(item);}ListView listView = findViewById(R.id.list);SimpleAdapter adapter = new SimpleAdapter(this, mData, android.R.layout.simple_list_item_2,new String[] {"project", "dev"},new int[] {android.R.id.text1, android.R.id.text2});// 设置分割线listView.setDivider(new ColorDrawable(Color.RED));// 设置分割线的宽度listView.setDividerHeight(5);listView.setAdapter(adapter);}
}

实现的效果如下

从上面的代码可以看到adapter 加载item layout 使用的是同,其实我们可以自己写layout ,下面写一个横线的layout

layout 代码如下

<?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="80dp"android:orientation="horizontal"><TextViewandroid:id="@+id/simple_id"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="center"android:textColor="@android:color/holo_blue_light"android:gravity="center" /><TextViewandroid:id="@+id/simple_name"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="center"android:layout_marginLeft="50dp"android:textColor="@android:color/holo_blue_light"android:gravity="center" /><TextViewandroid:id="@+id/simple_sex"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="center"android:textSize="20sp"android:textColor="@android:color/holo_red_dark"android:layout_marginLeft="100dp"android:gravity="center" /><TextViewandroid:id="@+id/simple_class"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="center"android:textSize="28sp"android:textColor="@android:color/holo_purple"android:layout_marginLeft="100dp"android:gravity="center" /></LinearLayout>

java 代码如下

public class SingleSimpleAdapterActivity extends AppCompatActivity {@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.simple_adapter_activity_layout);List<Map<String, Object>> mData = new ArrayList<>();Map<String, Object> map1 = new HashMap<>();map1.put("name", "张三");map1.put("sex", "男");map1.put("class", "一年级");Map<String, Object> map2 = new HashMap<>();map2.put("name", "李四");map2.put("sex", "男");map2.put("class", "二年级");Map<String, Object> map3 = new HashMap<>();map3.put("name", "王二");map3.put("sex", "男");map3.put("class", "三年级");Map<String, Object> map4 = new HashMap<>();map4.put("name", "春花");map4.put("sex", "女");map4.put("class", "一年级");Map<String, Object> map5 = new HashMap<>();map5.put("name", "夏草");map5.put("sex", "女");map5.put("class", "二年级");Map<String, Object> map6 = new HashMap<>();map6.put("name", "秋香");map6.put("sex", "女");map6.put("class", "三年级");mData.add(map1);mData.add(map2);mData.add(map3);mData.add(map4);mData.add(map5);mData.add(map6);ListView listView = findViewById(R.id.list);SimpleAdapter adapter = new SimpleAdapter(this, mData, R.layout.single_simple_adapter_item, new String[] {"name", "sex", "class"},new int[] {R.id.simple_name, R.id.simple_sex, R.id.simple_class});// 设置分割线listView.setDivider(new ColorDrawable(Color.RED));// 设置分割线的宽度listView.setDividerHeight(5);listView.setAdapter(adapter);}
}

实现的效果图

3 SimpleCursorAdapter 的主要代码如下

public class SimpleCursorActivity extends AppCompatActivity {@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.simple_adapter_activity_layout);String[] simpleCursor = new String[] {"_id", "name", "sex", "class"};MatrixCursor cursor = new MatrixCursor(simpleCursor);cursor.addRow(new Object[] {null,"张三", "男", "一年级"});cursor.addRow(new Object[] {null,"李四", "男", "二年级"});cursor.addRow(new Object[] {null,"王二", "男", "三年级"});cursor.addRow(new Object[] {null,"春花", "女", "一年级"});cursor.addRow(new Object[] {null,"夏草", "女", "二年级"});cursor.addRow(new Object[] {null,"秋香", "女", "三年级"});ListView listView = findViewById(R.id.list);SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,R.layout.single_simple_adapter_item, cursor, simpleCursor,new int[] {R.id.simple_id,R.id.simple_name, R.id.simple_sex, R.id.simple_class});// 设置分割线listView.setDivider(new ColorDrawable(Color.RED));// 设置分割线的宽度listView.setDividerHeight(5);listView.setAdapter(adapter);}
}

实现的效果图

4 BaseAdapter 通用的是适配器,(一般都是自定义)

定义一个myAdapter

public class MyAdapter extends BaseAdapter {private List<ListBean> mDatas = null;private Context mContext = null;public MyAdapter(Context context, List<ListBean> datas) {mDatas = datas;mContext = context;}@Overridepublic int getCount() {return mDatas.size();}@Overridepublic Object getItem(int position) {return mDatas.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder;if (convertView == null) {holder = new ViewHolder();convertView = LayoutInflater.from(mContext).inflate(R.layout.list_base_item, null);holder.image = convertView.findViewById(R.id.image);holder.title = convertView.findViewById(R.id.title);holder.content = convertView.findViewById(R.id.content);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}holder.image.setImageResource(mDatas.get(position).getImgId());holder.title.setText(mDatas.get(position).getTitle());holder.content.setText(mDatas.get(position).getContent());return convertView;}public final class ViewHolder {public ImageView image;public TextView title;public TextView content;}}

布局 list_base_item

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="120dp"xmlns:app="http://schemas.android.com/apk/res-auto"><ImageViewandroid:id="@+id/image"android:layout_width="120dp"android:layout_height="match_parent"android:src="@color/colorAccent"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintBottom_toBottomOf="parent" /><TextViewandroid:id="@+id/title"android:layout_height="wrap_content"android:layout_width="wrap_content"android:text="标题头"app:layout_constraintLeft_toRightOf="@+id/image"app:layout_constraintTop_toTopOf="parent"android:layout_marginLeft="50dp" /><TextViewandroid:id="@+id/content"android:layout_height="wrap_content"android:layout_width="wrap_content"android:text="标题头"app:layout_constraintLeft_toRightOf="@+id/image"app:layout_constraintTop_toBottomOf="@+id/title"android:layout_marginTop="50dp"android:layout_marginLeft="50dp" />
</androidx.constraintlayout.widget.ConstraintLayout>

activity 代码如下

public class ListBaseAdapterActivity extends AppCompatActivity {@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.simple_adapter_activity_layout);List<ListBean> list = new ArrayList<>();for (int i = 0; i < 20; i++) {ListBean listBean = new ListBean(R.mipmap.one, "标题头", "内容内容");list.add(listBean);}ListView listView = findViewById(R.id.list);MyAdapter adapter = new MyAdapter(ListBaseAdapterActivity.this, list);// 设置分割线listView.setDivider(new ColorDrawable(Color.RED));// 设置分割线的宽度listView.setDividerHeight(5);listView.setAdapter(adapter);}
}

实现的效果图

代码都狠简单就不多啰嗦了,

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