Android自定义实现日历控件 Android自定义实现日历控件

本文实例为大家分享了Android自定义实现日历控件的具体代码，供大家参考，具体内容如下
1. Calendar类
2. 布局
创建calendar_layout.xml

创建item_layout.xml

在activity_main.xml中

3. 业务处理
创建NewCalendar类，继承LinearLayout

public class NewCalendar extends LinearLayout {private TextView lastTv,nextTv,dateTv; private GridView calendarGv; private Calendar calendar=Calendar.getInstance(); //日历控件初始化//重写三个构造方法public NewCalendar(Context context) {super(context); }public NewCalendar(Context context, @Nullable AttributeSet attrs) {super(context, attrs); initControl(context); //绑定控件}public NewCalendar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr); initControl(context); //绑定控件}private void initControl(Context context){bindControl(context); //绑定控件bindControlEvent(); //绑定控件事件}//绑定控件事件方法private void bindControlEvent() {renderCalendar(); //“下一月”点击事件nextTv.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {calendar.add(Calendar.MONTH,+1); //月份+1renderCalendar(); }}); //“上一个”点击事件lastTv.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {calendar.add(Calendar.MONTH,-1); //月份-1renderCalendar(); }}); }private void renderCalendar() {SimpleDateFormat sdf = new SimpleDateFormat("MMM yyy"); //日期格式化dateTv.setText(sdf.format(calendar.getTime())); //设置月份ArrayList cells = new ArrayList<>(); Calendar calendar1 = (Calendar) calendar.clone(); //克隆日历对象calendar1.set(Calendar.DAY_OF_MONTH, 1); //置于当月第一天; int prevDays = calendar1.get(Calendar.DAY_OF_WEEK) - 1; //获取上个月最后一天是星期几calendar1.add(Calendar.DAY_OF_MONTH, -prevDays); //第一天int maxCount = 6 * 7; //设置每个月最大天数//循环存入集合中while (cells.size() < maxCount) {cells.add(calendar1.getTime()); calendar1.add(Calendar.DAY_OF_MONTH, 1); //日期+1}//设置适配器calendarGv.setAdapter(new CalendarAdapter(getContext(),cells)); }//适配器private class CalendarAdapter extends ArrayAdapter{LayoutInflater layoutInflater; public CalendarAdapter(@NonNull Context context,ArrayList days) {super(context, R.layout.item_layout,days); layoutInflater=LayoutInflater.from(context); }@NonNull@Overridepublic View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {Date date=getItem(position); ViewHolder viewHolder; if (convertView==null){//初始化绑定convertView=layoutInflater.inflate(R.layout.item_layout,parent,false); viewHolder=new ViewHolder(); viewHolder.itemTv=convertView.findViewById(R.id.itemTv); convertView.setTag(viewHolder); }viewHolder= (ViewHolder) convertView.getTag(); int day=date.getDate(); viewHolder.itemTv.setText(String.valueOf(day)); //赋值return convertView; }class ViewHolder{TextView itemTv; }}private void bindControl(Context context) {LayoutInflater inflater=LayoutInflater.from(context); inflater.inflate(R.layout.calendar_layout,this); lastTv=findViewById(R.id.lastTv); nextTv=findViewById(R.id.nextTv); dateTv=findViewById(R.id.dateTv); calendarGv=findViewById(R.id.calendarGv); }}

3. 定制UI
在适配器getView()方法中，个性化日历界面

Date now=new Date(); Boolean isTheSameMonth=false; //是否与当前月份相同//判断显示的日期月份与当前月份相同 if (date.getMonth()==now.getMonth()) {//月份相同isTheSameMonth = true; }//若显示的日期月份与当前月份相同,则设置字体颜色是黑色if (isTheSameMonth) {viewHolder.itemTv.setTextColor(Color.parseColor("#000000")); }//设置当前日期字体为红色if (now.getDate()==date.getDate()&&now.getMonth()==date.getMonth()&&now.getYear()==date.getYear()){viewHolder.itemTv.setTextColor(Color.parseColor("#ff0000")); }

【Android自定义实现日历控件】4. 事件监听
在NewCalendar中，首先编写长按事件的接口，然后设置适配器点击事件

//长按事件接口public interface NewCalendarListener{void onItemClick(Date date); }//适配器长按事件calendarGv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {@Overridepublic boolean onItemLongClick(AdapterView parent, View view, int position, long id) {if (listener==null){return false; }else {//获取长按的位置，传入onItemClick方法中listener.onItemClick((Date) parent.getItemAtPosition(position)); return true; }}});

在MainActivity中，实现长按事件接口并重写方法，实现长按某个日期弹出Toast显示当前长按日期。

@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); NewCalendar calendar=findViewById(R.id.calendarNc); calendar.listener=this; }//MainActivity实现长按事件接口@Overridepublic void onItemClick(Date date) {DateFormat df= SimpleDateFormat.getDateInstance(); Toast.makeText(this,df.format(date),Toast.LENGTH_SHORT).show(); }