我正在做一個android應用程序,因爲我用com.android.internal API的。它們是Call.java,CallManger.java。對於這些類,我爲Call.java創建了子類。你可以在這裏找到這兩個類http://hi-android.info/src/com/android/internal/telephony/Call.java.html和http://hi-android.info/src/com/android/internal/telephony/CallManager.java.html。 Call.java的ClassCastException錯誤
子類:
公共類的MyCall擴展呼叫{
1. CallManager cm = CallManager.getInstance();
2. Phone.State state;
3.
4. Phone mDefaultPhone;
5. private final ArrayList<Connection> emptyConnections = new ArrayList<Connection>();
6. List<Call> ringingCall;
7.
8. @Override
9. public List<Connection> getConnections() {
10.
11.
12. state = cm.getState();
13. ringingCall = cm.getForegroundCalls();
14. System.out.println("**inside getConnections="+state);
15. System.out.println("**inside getConnections="+ringingCall);
16. if (ringingCall == null) {
17.
18. System.out.println("**call is null***");
19. return emptyConnections;
20. }
21. else
22. {
23. System.out.println("**call is not null***");
24. return ((Call) ringingCall).getConnections();
}
}
@Override
public Phone getPhone() {
// TODO Auto-generated method stub
return null;
}
@Override
public void hangup() throws CallStateException {
// TODO Auto-generated method stub
}
@Override
public boolean isMultiparty() {
// TODO Auto-generated method stub
return false;
}
public Connection
getEarliestConnection() {
List l;
long time = Long.MAX_VALUE;
Connection c;
Connection earliest = null;
l = getConnections();
if (l == null) {
return null;
}else if (l.size() == 0)
{
return null;
}
for (int i = 0, s = l.size() ; i < s ; i++) {
c = (Connection) l.get(i);
long t;
t = c.getCreateTime();
if (t < time) {
earliest = c;
time = t;
}
}
return earliest;
}
}
我叫CallManger的實例就像這樣:
CallManager cm = CallManager.getInstance();
Bcoz這是一個final修飾符的類。我的另一個類是CallUpdate.java。
public class CallUpdate {
Call myCall = new MyCall();
Connection myConn = new MyConnection();
CallManager cm = CallManager.getInstance();
public Object getCallFailedString(){
myConn = myCall.getEarliestConnection();
System.out.println("myConn is ******"+myConn);
System.out.println("myCall is ******"+myCall);
if(myConn == null){
System.out.println("myConn is null ******");
return null;
}
else
{
Connection.DisconnectCause cause = myConn.getDisconnectCause();
System.out.println("myconn is not null ******"+cause);
}
}
我得到myConn值爲空。爲此,我在MyCall類的getConnection方法中添加了一段代碼以獲取myConn的非空值。即
state = cm.getState();
ringingCall = cm.getForegroundCalls();
System.out.println("**inside getConnections="+state);
System.out.println("**inside getConnections="+ringingCall);
if (ringingCall == null) {
System.out.println("**call is null***");
return emptyConnections;
}
else
{
System.out.println("**call is not null***");
return ((Call) ringingCall).getConnections();
}
但它線路上無拋出ClassCastException異常錯誤:24和上線 l = getConnections();
。 而且我還需要至少一個傳出呼叫才能獲得myConn的值。如何解決這個錯誤?
Thx提前。
ok Jon thk u。很高興看到你:) – shiv1229 2012-01-07 11:03:30
我必須做的才能在手機中獲得積極的通話。你能給我什麼建議嗎? – shiv1229 2012-01-07 11:07:10
@ shiv1229:那麼你可以調用'getForegroundCalls()'看看它是否爲空... – 2012-01-07 11:09:32