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POHow to get a Call state of a phone
 

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  1. POHow to get a Call state of a phone
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/8740035/trouble-with-reading-phone-state">Trouble with reading phone state</a> </p> </blockquote> <p>I want to get a call state of phone in my application. I am doing one application in which , When user dial to a number, then my application should come to know whether other side phone is Busy, Not-reachable or power-off states etc. For this I used com.android.internal API's they are Call.java<code>&lt;http://hi-android.info/src/com/android/internal/telephony/Call.java.html&gt;</code>, CallManger.java<code>&lt;http://hi-android.info/src/com/android/internal/telephony/CallManager.java.html&gt;</code> and Connection.java<code>&lt;http://hi-android.info/src/com/android/internal/telephony/Connection.java.html&gt;</code>. I created subclass of Call.java like this:</p> <pre><code>public class MyCall extends Call{ CallManager cm = CallManager.getInstance(); Connection c; Phone mDefaultPhone; private final ArrayList&lt;Connection&gt; emptyConnections = new ArrayList&lt;Connection&gt;(); int size; List&lt;Call&gt; ringingCall = cm.getForegroundCalls(); @Override public List&lt;Connection&gt; getConnections() { System.out.println("**value of list***"+ringingCall.size()); if(ringingCall != null &amp;&amp; !ringingCall.isEmpty()){ System.out.println("inside if****"); System.out.println("**call is not null***"); System.out.println("value of call"+ringingCall); return ((MyCall) ringingCall).getConnections(); } else{ System.out.println("**list is null***"); return emptyConnections; } } @Override public Phone getPhone() { // TODO Auto-generated method stub System.out.println("**inside getPhone***"); return null; } @Override public void hangup() throws CallStateException { // TODO Auto-generated method stub System.out.println("**inside hangUp***"); } @Override public boolean isMultiparty() { // TODO Auto-generated method stub System.out.println("**inside isMultiparty***"); return false; } public Connection getEarliestConnection() { Connection myConn = new MyConnection(); System.out.println("inside EarliestConnection"); List&lt;Connection&gt; l; long time = Long.MAX_VALUE; Connection c; Connection earliest = null; l = getConnections(); System.out.println("value of connection is=="+l); if (l == null) { return null; }else if ( l.size() == 0) { return null; } for (int i = 0, s = l.size() ; i &lt; s ; i++) { c = (Connection) l.get(i); long t; t = c.getCreateTime(); if (t &lt; time) { earliest = c; time = t; } } return earliest; } } </code></pre> <p>Here I am getting the ringingCall.size is 0 for that it is executing else part. And one more class is CallUpdate.java.</p> <pre><code>public class CallUpdate { Call myCall = new MyCall(); CallManager cm = CallManager.getInstance(); public Object getCallFailedString(){ Connection 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); switch(cause){ case BUSY : System.out.println("inside busy"); break; case NUMBER_UNREACHABLE : System.out.println("inside un-reachable"); break; case POWER_OFF : System.out.println("inside power off"); break; } } return myConn; } } </code></pre> <p>In this code getting myConn value is null. I called CallManger class is like this:</p> <pre><code>CallManager cm = CallManager.getInstance(); </code></pre> <p>But when I print this getting null pointer exception. <code>System.out.println("value of cm"+cm);</code> why this exception? Can anybody tell me?</p>
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    1. USshiv1229
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      1. VTModeratorReview
    1. COLook into logcat. CallManager seems like an internal service, and you might not have permissions to get access to it.
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      1. USVikram Bodicherla
    2. CO@Vikram thnks alot for ur rply. Internal service means what?
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      1. USshiv1229
    3. CO@Vikram: Can you tell me any other way to solve this kind of problem?
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