call自動轉speaker

package com.example.testallstar;

import java.io.DataOutputStream;
import java.io.IOException;

import android.media.AudioManager;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.TelephonyManager;
import android.view.Menu;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

TelephonyManager manager = (TelephonyManager) this
.getSystemService(TELEPHONY_SERVICE);

manager.listen(new MyPhoneStateListener(),
PhoneStateListener.LISTEN_CALL_STATE);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

class MyPhoneStateListener extends PhoneStateListener {

@Override
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
Toast.makeText(getApplicationContext(), "Phone Free",
Toast.LENGTH_SHORT).show();
break;
case TelephonyManager.CALL_STATE_RINGING:
Toast.makeText(getApplicationContext(),
"  手台鈴聲響了，來電號碼:" + incomingNumber, Toast.LENGTH_SHORT)
.show();

break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Toast.makeText(getApplicationContext(), "電話完成掛起",
Toast.LENGTH_SHORT).show();
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.setMode(AudioManager.MODE_IN_CALL);
audioManager.setSpeakerphoneOn(true);
default:
break;
}

super.onCallStateChanged(state, incomingNumber);
}

}

}

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<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />