Android来电自动接听，自动录音，自动回拨功能

public class MainActivity extends Activity {  

    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        // TODO Auto-generated method stub  
        super.onCreate(savedInstanceState);  
        TelephonyManager mTelephonyManager =(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);  
        mTelephonyManager.listen(new PhoneListener(), PhoneStateListener.LISTEN_CALL_STATE);  
        ITelephony mTelephony = ITelephony.Stub.asInterface(ServiceManager.getService("phone"));  
    }  

    class PhoneListener extends PhoneStateListener {  
        private MediaRecorder mRecorder = null;  
        private boolean flag = false;  
        private String phoneNum = null;  
        @Override  
        public void onCallStateChanged(int state, String incomingNumber) {  
            // TODO Auto-generated method stub  
            switch (state) {  
                case TelephonyManager.CALL_STATE_IDLE:  
                    try {  
                        if (mRecorder != null) {  
                            mRecorder.stop(); // 停止  
                            mRecorder.release();// 释放  
                            mRecorder = null;// 垃圾回收  
                        }  
                        if (flag) {  
                            mTelephony.call(phoneNum);  
                            flag = false;  
                        }     
                    } catch (Exception e) {  
                        // TODO Auto-generated catch block  
                        e.printStackTrace();  
                    }  
                    break;  
                case TelephonyManager.CALL_STATE_OFFHOOK:  
                    //通话录音  
                    try {  
                        mRecorder = new MediaRecorder();  
                        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); // 此处只实现了录本地MIC输入的声音,若想录入对立通话者的声音  
                        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);  
                        mRecorder.setOutputFile("/mnt/sdcard/" + incomingNumber + "_"+ System.currentTimeMillis() + ".3gp");  
                        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);  
                        try {  
                            mRecorder.prepare();  
                        } catch (Exception e) {  
                            e.printStackTrace();  
                        }  
                        mRecorder.start();  
                        Thread.sleep(30 * 1000);  
                    } catch (Exception e) {  
                        // TODO Auto-generated catch block  
                        e.printStackTrace();  
                    }  
                    break;  
                case TelephonyManager.CALL_STATE_RINGING:  
                    //来电自动接听  
                    try {  
                        phoneNum = incomingNumber;  
                        flag = true;  
                        if (mTelephony.isRinging()) {  
                            mTelephony.silenceRinger();  
                            mTelephony.answerRingingCall();  
                        }  
                    } catch (Exception e) {  
                        // TODO Auto-generated catch block  
                        e.printStackTrace();  
                    }  
                    break;  
                default:  
                    break;  
            }  
            super.onCallStateChanged(state, incomingNumber);  
        }  
    }  
}