这是我的主要活动，其中包含请求阅读日历和通话电话的权限的方法，从日历提取电话号码等获取事件，并将其显示在活动上。但是在第一次启动后它仍然为空给予权限，为下次启动所有数据出现，为什么会发生这种情况？
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.lvExp);
getPermissionToDialToAContact();
getPermissionToReadCalender();
// preparing list data
if (listDataHeader != null && listDataChild != null) {
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
// Listview Group click listener
expListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
return false;
}
});
// Listview Group expanded listener
expListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
}
});
// Listview on child click listener
expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
callPosition= phoneNumber.size();
if(childPosition<callPosition){
dialContact(phoneNumber,childPosition);
}
return false;
}
});
}
}
}}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case READ_CALENDER: {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Log.i("mainactonreqpermethod ","mainactonreqpermethod");
RuntimeData.setsCalendarData(getCalender(null));
prepareListData();
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return ;
}
// other 'case' lines to check for other
// permissions this app might request
case CALL_PHONE: {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
}
}
private void getPermissionToReadCalender() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
if (shouldShowRequestPermissionRationale(
Manifest.permission.READ_CALENDAR)) {
}
requestPermissions(new String[]{Manifest.permission.READ_CALENDAR},
READ_CALENDER);
}else {
RuntimeData.setsCalendarData(getCalender(null));
prepareListData();//adding data to list
}
}
private void prepareListData() {
// mEventDesc=mData.getEventTitle();
if (RuntimeData.getsCalendarData()!=null){
Log.i("runtimedata","runtimedata");
mData = RuntimeData.getsCalendarData();
Log.i("runtimedatatomdata","runtimedatatomdata");
}
Log.i("list daataheader", "list daataheader" +mData.getEventTitle());
if(mData.getEventTitle()!=null) {
listDataHeader = new ArrayList<String>();
phNum=new ArrayList<String>();
child1=new ArrayList<String>();
// listDataHeader = mData.getEventTitle();
listDataChild = new HashMap<String, List<String>>();
Log.i("list daataheader", "list daataheader" + listDataHeader);
Log.i("list daatachild", "list daatachild" + listDataChild);
// Adding child data
listDataHeader.add(mData.getEventTitle().get(0));
// listDataHeader.add(mData.getEventTitle().get(1));
// listDataHeader.add(mData.getEventTitle().get(2));
mEventData= extractDescription(mData);
// listDataHeader.add("Top 250");
// listDataHeader.add("Now Showing");
// listDataHeader.add("Coming Soon..");
// Adding child data
if(mEventData!=null) {
for (int i = 0; i < mEventData.getPhoneNumber().size(); i++) {
phNum = mEventData.getPhoneNumber();
child1.add(phNum.get(i));
Log.i("list daatachild", "list daatachild" + String.valueOf(phNum));
}
Log.i("list daataheader", "list daataheader" +child1.size());
child1.add(mEventData.getMeetingID().get(0));
child1.add(mEventData.getMeetingPassWord().get(0));
listDataChild.put(listDataHeader.get(0), child1);
}}
private void getPermissionToDialToAContact() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
if (shouldShowRequestPermissionRationale(
Manifest.permission.CALL_PHONE)) {
}
requestPermissions(new String[]{Manifest.permission.CALL_PHONE},
CALL_PHONE);
}else {
}
}
}