因此,我尝试从头开始创建自定义日历,它仍然看起来像一个基本的日历。
我创建了自己的CustomAdapter
来实现ArrayAdapter
,以便它可以自动更改值。这是我到目前为止所得到的:
MainActivity.java
package com.example.aldos.calendar;
import android.content.Context;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.TextView;
/**
* Created by aldos on 11/13/2016.
*/
public class CustomAdapter extends ArrayAdapter<String> {
private Context c;
private String[] date ;
private LayoutInflater inflater;
public CustomAdapter(Context context,String[] objects) {
super(context, android.R.layout.simple_list_item_1, objects);
this.c = context;
date = objects;
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return date.length;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView textView;
if(convertView == null){
convertView = inflater.inflate(R.layout.activity_main,parent,false);
textView = new TextView(c);
textView.setLayoutParams(new GridView.LayoutParams(120,120));
textView.setGravity(Gravity.CENTER);
textView.setPadding(5,5,5,5);
}else{
textView = (TextView) convertView;
}
textView.setText(date[position]);
return textView;
}
}
还有 Customadapter.java
package com.example.aldos.calendar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.GridView;
import java.util.Calendar;
import java.util.Date;
public class MainActivity extends AppCompatActivity {
Calendar calen = Calendar.getInstance();
int month = Calendar.MONTH;
String[] DateList ;
CustomAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DateList = init();
GridView grid = (GridView) findViewById(R.id.gridview);
adapter = new CustomAdapter(this,DateList);
grid.setAdapter(adapter);
}
public void previous(View v){
month--;
DateList = changemonth(month);
for(int i = 0; i < DateList.length;i++){
Log.d("prev",""+ DateList[i]);
}
adapter.notifyDataSetChanged();
}
public void next(View v){
month--;
DateList = changemonth(month);
adapter.notifyDataSetChanged();
}
private String[] init(){
String[] DateList = new String[42];
calen.set(Calendar.DAY_OF_MONTH,1); // first day of the month
int date = calen.get(Calendar.DATE);
int month = calen.get(Calendar.MONTH);
int year = calen.get(Calendar.YEAR);
int day = calen.get(Calendar.DAY_OF_WEEK);
DateList = BeforeMonth(DateList,day,month);
int numdays = daysinamonth(month);
int endmonth = numdays+day -1;
int j = day-1;
while(j < (numdays+day-1) ){
DateList[j] = Integer.toString(calen.get(Calendar.DATE));
calen.add(Calendar.DAY_OF_MONTH,1);
j++;
}
int end = 1;
while(endmonth <42){
DateList[endmonth] = Integer.toString(end);
endmonth++;
end++;
}
return DateList;
}
private String[] changemonth(int month){
calen.set(Calendar.YEAR,month,Calendar.DATE);
return init();
}
//adds the days before the first day of the month to the string list
private String[] BeforeMonth(String[] d, int day, int month){
int LastMo = daysinamonth( month-1); // know how many days in the last month 31 10-1
//Log.d("bmon","the current month" + month + " last month days " + LastMo + " day " + day);
switch (day){
case 1: // sunday
break;
case 2: // monday
d[0] = Integer.toString(LastMo);
break;
case 3: // tuesday
d[0] = Integer.toString(LastMo-1);
d[1] = Integer.toString(LastMo);
break;
case 4: // wednesday
d[0] = Integer.toString(LastMo-2);
d[1] = Integer.toString(LastMo-1);
d[2] = Integer.toString(LastMo);
break;
case 5: // thursday
d[0] = Integer.toString(LastMo-3);
d[1] = Integer.toString(LastMo-2);
d[2] = Integer.toString(LastMo-1);
d[3] = Integer.toString(LastMo);
break;
case 6: //friday
d[0] = Integer.toString(LastMo-4);
d[1] = Integer.toString(LastMo-3);
d[2] = Integer.toString(LastMo-2);
d[3] = Integer.toString(LastMo-1);
d[4] = Integer.toString(LastMo);
break;
case 7: //saturday
d[0] = Integer.toString(LastMo-5);
d[1] = Integer.toString(LastMo-4);
d[2] = Integer.toString(LastMo-3);
d[3] = Integer.toString(LastMo-2);
d[4] = Integer.toString(LastMo-1);
d[5] = Integer.toString(LastMo);
break;
}
return d;
}
//check how many days are in each month
private int daysinamonth(int month){
switch (month){
case 0: // January
return 31;
case 1: // February
return 28;
case 2: // March
return 31;
case 3: // April
return 30;
case 4: // May
return 31;
case 5: // June
return 30;
case 6: // July
return 31;
case 7: // August
return 31;
case 8: // Sept
return 30;
case 9: // Oct
return 31;
case 10: // Nov
return 30;
case 11: // Dec
return 31;
default:
return 0;
} // switch stmt
}
}
代码可以正常工作,但是当我点击我的上一个和下一个按钮(使用onClick = "previous"
和onClick = "next"
)时,什么都不会发生。价值不会改变。谁知道为什么?
备注可能有所帮助:
我在ArrayAdapter
而不是ArrayList
中使用了一系列字符串。
出于此问题的目的,您只需要查看onCreate
,previous
和我的adapters
。大多数功能只是确定我的日期列表数组。
notifyDataSetChanged
仅适用于previous
和next
功能,但不起作用。
我一直试图找到一个类似于我的问题,但我发现它确实无效。 谢谢
答案 0 :(得分:0)
在您的代码中,您没有再次为适配器设置值,因此请使用新值设置适配器并通知。
public void next(View v){
month--;
DateList = changemonth(month);
adapter = new CustomAdapter(this,DateList);
grid.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
public void previous(View v){
month--;
DateList = changemonth(month);
for(int i = 0; i < DateList.length;i++){
Log.d("prev",""+ DateList[i]);
}
adapter = new CustomAdapter(this,DateList);
grid.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
制作这样的字符并检查。