定制listview的界面

思维导图如下：

定制listview的界面.png

代码片段如下：

public class listactivity extends AppCompatActivity {
    private Listlist=new ArrayList<>();
    private ListView listView;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listactivity);
        addshuju();
        listView= (ListView) findViewById(R.id.list);
        listView.setAdapter(new frute(this,R.layout.buju,list));
    }

    private void addshuju() {
        list.add(new com.example.croppersample.frute("苹果",R.drawable.loan_photo_x2));
        list.add(new com.example.croppersample.frute("苹果",R.drawable.loan_photo_x2));
        list.add(new com.example.croppersample.frute("苹果",R.drawable.loan_photo_x2));
        list.add(new com.example.croppersample.frute("苹果",R.drawable.loan_photo_x2));
        list.add(new com.example.croppersample.frute("苹果",R.drawable.loan_photo_x2));
    }

    class frute extends ArrayAdapter{
        cheng c;
        int h;
        public frute(Context context, int resource, List objects) {
            super(context, resource, objects);
            h=resource;
        }

        @Override
        public int getCount() {
            return list.size();
        }
        @NonNull
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View v=LayoutInflater.from(getContext()).inflate(h,parent,false);
            com.example.croppersample.frute f=getItem(position);
            c=new cheng();
                c.tt= (TextView) v.findViewById(R.id.textView);
                c.ii= (ImageView) v.findViewById(R.id.imageView);
                c.tt.setText(f.getName());
                c.ii.setImageResource(f.getId());
            return v;
        }
        class cheng{
            TextView tt;
            ImageView ii;
        }
    }
}

bean文件中

public class frute {
    private String name;
    private int id;

    public frute(String name, int id) {
        this.name = name;
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
}

在buju.xml文件中

注意：可以通过如下代码修改listview的item的颜色和item之间的间隔

android:divider="#ffffff"
android:dividerHeight="10dp"

利用getView方法中的convertView参数，实现系统内存的优化， convertView参数当第一个item加载的时候它是null的，但是加载第二个item及以后的item的时候它就不是null了，因为第一个item创建好之后return回去的那个view就传到了getView的第二个参数那里了，但是要注意要复用的话记得用setTag绑定viewHolder，和用getTag得到viewHolder，我当时想的是多个item重复使用一个view和一个viewholder来实现复用，太年轻了，实现不了，只有通过getView的第二个参数来实现复用

public class XueHuaActivity extends AppCompatActivity {
    private ListView listView;
    private ShiPeiQi shiPeiQi;
    private List list;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.xuehua);
        listView = (ListView) findViewById(R.id.list);
        list = new ArrayList<>();
        list.add("第一个");
        list.add("第二个");
        list.add("第三个");
        list.add("第四个");
        list.add("第五个");
        list.add("第六个");
        shiPeiQi = new ShiPeiQi(R.layout.hehe, list);
        listView.setAdapter(shiPeiQi);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView parent, View view, int position, long id) {
                Toast.makeText(XueHuaActivity.this, list.get(position), Toast.LENGTH_SHORT).show();
            }
        });
    }

    private class ShiPeiQi extends BaseAdapter {
        private int layout;
        private List list;
        private ViewHolder viewHolder;

        public ShiPeiQi(int layout, List list) {
            this.layout = layout;
            this.list = list;
        }

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            return list.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {//第一个item的convertView为空
                convertView = LayoutInflater.from(getApplicationContext()).inflate(layout, null);//在这里设置了复用，以后的item将会复用第一个item，节省内存资源
                viewHolder = new ViewHolder();
                viewHolder.textView = (TextView) convertView.findViewById(R.id.textView7);
                convertView.setTag(viewHolder);
            } else {
                viewHolder= (ViewHolder) convertView.getTag();
            }
            viewHolder.textView.setText(list.get(position));
            return convertView;
        }
/*将上面的getView中的方法体写成如下也行，上面的那个是包建强的写法，以下是郭霖的写法
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                view = LayoutInflater.from(getApplicationContext()).inflate(layout, null);
                viewHolder = new ViewHolder();
                viewHolder.textView = (TextView) view.findViewById(R.id.textView7);
                view.setTag(viewHolder);//这里view调用了setTag方法，当最后return之后，view就传到了getView的第二个参数convert
            } else {
                view=convertView;
                viewHolder= (ViewHolder) view.getTag();
            }
            viewHolder.textView.setText(list.get(position));
            return view;
        }
*/
        class ViewHolder {
            private TextView textView;
        }
    }
}

下面这个博客可以看看
https://blog.csdn.net/xulianboblog/article/details/51419039