My Program Hang When I Use Calendarview In My Activity

When I put this in my layout.xml My

Solution 1:

Use custom calendar

In your activity

 String date="";
GridView grid;
ImageView left,right;
TextView mon,yr;
MyCalendarAdapter adapter2;
ArrayList<String> weeks = new ArrayList<>();

String[] months= {"JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER",
        "NOVEMBER","DECEMBER"};
privateint month,year,current_month,current_year;
Date d;
Calendar cal;
private String dayOfTheWeek;
@SuppressLint("ResourceType")
@Override
protectedvoidonCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dynamic_history);

    weeks.add("SUN");
    weeks.add("MON");
    weeks.add("TUE");
    weeks.add("WED");
    weeks.add("THU");
    weeks.add("FRI");
    weeks.add("SAT");

    grid =  findViewById(R.id.grid);
    left =  findViewById(R.id.left);
    right =  findViewById(R.id.right);
    mon =  findViewById(R.id.mon);
    yr =  findViewById(R.id.yr);

    cal = Calendar.getInstance();
    month = cal.get(Calendar.MONTH);
    year = cal.get(Calendar.YEAR);

    current_month = cal.get(Calendar.MONTH);
    current_year = cal.get(Calendar.YEAR);

    final SimpleDateFormat sdf = new SimpleDateFormat("EEE");
    d = new Date();
    d.setDate(1);
    dayOfTheWeek = sdf.format(d).toUpperCase();
    Log.d("FIRSTDAY",""+dayOfTheWeek);

    adapter2= new MyCalendarAdapter(cal,weeks.indexOf(dayOfTheWeek));
    grid.setAdapter(adapter2);
    mon.setText(months[month]);
    yr.setText(""+year);

    grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        publicvoidonItemClick(AdapterView<?> parent, View view, int position, long id) {

            int pos= (Integer) view.getTag();

            adapter2.notifyDataSetChanged();
        }
    });

     left.setOnClickListener(new View.OnClickListener() {
        @Override
        publicvoidonClick(View v) {
            if(month==0)
            {
                month=11;
                year--;
            }
            else {
                month--;
            }
            d.setMonth(month);
            d.setYear(year);
            cal.set(Calendar.MONTH,month);
            cal.set(Calendar.YEAR,year);
            mon.setText(months[month]);
            yr.setText(""+year);
            dayOfTheWeek = sdf.format(d).toUpperCase();
            Log.d("FIRSTDAY",""+dayOfTheWeek);
            int w= weeks.indexOf(dayOfTheWeek);
            if(w==0)
            {
                adapter2= new MyCalendarAdapter(cal,6);
            }
            else {
                adapter2= new MyCalendarAdapter(cal,w-1);
            }
            grid.setAdapter(adapter2);

        }
    });

    right.setOnClickListener(new View.OnClickListener() {
        @Override
        publicvoidonClick(View v) {

                if (month == 11) {
                    month = 0;
                    year++;
                } else {
                    month++;
                }

                d.setMonth(month);
                d.setYear(year);
                cal.set(Calendar.MONTH, month);
                cal.set(Calendar.YEAR, year);
                mon.setText(months[month]);
                yr.setText("" + year);
                dayOfTheWeek = sdf.format(d).toUpperCase();
                Log.d("FIRSTDAY", "" + dayOfTheWeek);
                int w = weeks.indexOf(dayOfTheWeek);
                if (w == 0) {
                    adapter2 = new MyCalendarAdapter(cal, 6);
                } else {
                    adapter2 = new MyCalendarAdapter(cal, w - 1);
                }
                grid.setAdapter(adapter2);
            }

    });

}

activity.xml

<LinearLayoutandroid:paddingTop="@dimen/_8sp"android:paddingBottom="@dimen/_40sp"android:paddingRight="@dimen/_14sp"android:paddingLeft="@dimen/_16sp"android:background="@drawable/white_bg"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="wrap_content"
    ><LinearLayoutandroid:background="@color/colorPrimary"android:gravity="center"android:orientation="horizontal"android:layout_width="match_parent"android:layout_height="@dimen/_40sp"
        ><ImageViewandroid:id="@+id/left"android:padding="@dimen/_8sp"android:src="@drawable/left"android:layout_width="wrap_content"android:layout_height="wrap_content" /><LinearLayoutandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:orientation="horizontal"><TextViewandroid:paddingRight="@dimen/_5sp"android:id="@+id/mon"android:gravity="center_vertical|right"android:layout_width="wrap_content"android:layout_height="match_parent"android:textColor="@color/white"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text=""/><TextViewandroid:paddingLeft="@dimen/_5sp"android:id="@+id/yr"android:gravity="center_vertical"android:layout_width="wrap_content"android:layout_height="match_parent"android:textColor="@color/white"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text=""/></LinearLayout><ImageViewandroid:id="@+id/right"android:padding="@dimen/_8sp"android:src="@drawable/right"android:layout_width="wrap_content"android:layout_height="wrap_content" /></LinearLayout><LinearLayoutandroid:paddingTop="@dimen/_5sp"android:orientation="horizontal"android:layout_width="match_parent"android:layout_height="wrap_content"
        ><TextViewandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:textColor="@color/blue"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text="SUN"/><TextViewandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:textColor="@color/blue"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text="MON"/><TextViewandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:textColor="@color/blue"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text="TUE"/><TextViewandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:textColor="@color/blue"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text="WED"/><TextViewandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:textColor="@color/blue"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text="THU"/><TextViewandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:textColor="@color/blue"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text="FRI"/><TextViewandroid:gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:textColor="@color/blue"android:textSize="@dimen/_14sp"android:textStyle="bold"android:text="SAT"/></LinearLayout><GridViewandroid:padding="@dimen/_5sp"android:id="@+id/grid"android:numColumns="7"android:layout_weight="1"android:layout_width="match_parent"android:layout_height="match_parent"></GridView><!--<android.support.v4.view.ViewPager--><!--android:id="@+id/pager"--><!--android:layout_width="match_parent"--><!--android:layout_height="match_parent"--><!--android:layout_weight="1"></android.support.v4.view.ViewPager>--></LinearLayout>

Calendar adapter

publicclassMyCalendarAdapterextendsBaseAdapter {
   Calendar c;

    int ct;
    publicMyCalendarAdapter(Calendar c, int ct) {
        this.c = c;
        this.ct= ct;

        Log.d("FIRSTDAY",""+ct);
    }

    @OverridepublicintgetCount() {

        int x=getMonthDays(c.get(Calendar.MONTH)+1,c.get(Calendar.YEAR))+ct;
//        Log.d("FIRSTDAY",""+x);return x;
    }

    @Overridepublic Object getItem(int position) {
        return c;
    }

    @OverridepubliclonggetItemId(int position) {
        return position;
    }

    @Overridepublic View getView(int p, View convertView, ViewGroup parent) {
        LayoutInflatermLayoutInflater= (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        Viewv= mLayoutInflater.inflate(R.layout.my_calendar, parent, false);
        TextViewtext= v.findViewById(R.id.text);

        int position= p+1-ct;
        if(position>0) {
            v.setTag(position);
            text.setText("" + position);
        }
        return v;
    }
    publicstaticintgetMonthDays(int month, int year) {
        int daysInMonth ;
        if (month == 4 || month == 6 || month == 9 || month == 11) {
            daysInMonth = 30;
        }
        else {
            if (month == 2) {
                daysInMonth = (year % 4 == 0) ? 29 : 28;
            } else {
                daysInMonth = 31;
            }
        }
//        Log.d("FIRSTDAY","days "+daysInMonth);return daysInMonth;
    }
}