telephonyManager.listen forces application to terminate
Iam new with Android, and writting a small application for tracking call events. Every time i try to bind the listner, the os forces the app to close unexspectly. What did i miss? Here is my code:
package com.example.helloandroid;
import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.telephony.CellLocation; import android.telephony.PhoneStateListener; import android.telephony.ServiceState; import android.telephony.TelephonyManager; import android.widget.TextView;
public class helloAndroid extends Activity {
TextView textOut; TelephonyManager telephonyManager; PhoneStateListener phoneStateListener;
@Override public void onDestroy(){ telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_NONE);
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Get the UI
textOut = (TextView) findViewById(R.id.textOut);
// Get the telephony manager
telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
// Create a new PhoneStateListener
phoneStateListener = new PhoneStateListener() {
public void onCallForwardingIndicatorChanged(boolean cfi) {}
public void onCallStateChanged(int state, String incomingNumber) {}
public void onCellLocationChanged(CellLocation location) {}
public void onDataActivity(int direction) {}
public void onDataConnectionStateChanged(int state) {}
public void onMessageWaitingIndicatorChanged(boolean mwi) {}
public void onServiceStateChanged(ServiceState serviceState) {
String stateString = "N/A";
switch (serviceState.getState()) {
case TelephonyManager.CALL_STATE_IDLE:
stateString = "Idle";
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
stateString = "Off Hook";
break;
case TelephonyManager.CALL_STATE_RINGING:
stateString = "Ringing";
break;
}
textOut.append(String.format("nonCallStateChanged: %s", stateString));
}
public void onSignalStrengthChanged(int asu) {}
};
// Register the listener with the telephony manager
telephonyManager.listen(phoneStateListener,
PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR |
PhoneStateListener.LISTEN_CALL_STATE |
PhoneStateListener.LISTEN_CELL_LOCATION |
PhoneStateListener.LISTEN_DATA_ACTIVITY |
PhoneStateListener.LISTEN_DATA_CONNECTION_STATE |
PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR |
PhoneStateListener.LISTEN_SERVICE_STATE |
PhoneStateListener.LISTEN_SIGNAL_STRENGTH);
}
}
我的错误：需要添加权限ACCESS_COARSE_LOCATION
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