源碼簡介：MIUI錄音機是基于Android原生錄音機來開發的，能夠運行在Android2.3.3及以上版本。與Android原生錄音機相比，MIUI錄音機在UI、交互方式和錄音效果上都有較大的提升，其磁帶的顯示效果更是收到了很多用戶的好評

源碼效果：

源碼片段：

/* 
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *        http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */ 
  
package net.micode.soundrecorder; 
  
import android.app.KeyguardManager; 
import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.app.Service; 
import android.content.Context; 
import android.content.Intent; 
import android.media.AudioManager; 
import android.media.MediaRecorder; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.IBinder; 
import android.os.PowerManager; 
import android.os.PowerManager.WakeLock; 
import android.telephony.PhoneStateListener; 
import android.telephony.TelephonyManager; 
  
import java.io.File; 
import java.io.IOException; 
  
public class RecorderService extends Service implements MediaRecorder.OnErrorListener { 
  
    public final static String ACTION_NAME = "action_type"; 
  
    public final static int ACTION_INVALID = 0; 
  
    public final static int ACTION_START_RECORDING = 1; 
  
    public final static int ACTION_STOP_RECORDING = 2; 
  
    public final static int ACTION_ENABLE_MONITOR_REMAIN_TIME = 3; 
  
    public final static int ACTION_DISABLE_MONITOR_REMAIN_TIME = 4; 
  
    public final static String ACTION_PARAM_FORMAT = "format"; 
  
    public final static String ACTION_PARAM_PATH = "path"; 
  
    public final static String ACTION_PARAM_HIGH_QUALITY = "high_quality"; 
  
    public final static String ACTION_PARAM_MAX_FILE_SIZE = "max_file_size"; 
  
    public final static String RECORDER_SERVICE_BROADCAST_NAME = "com.android.soundrecorder.broadcast"; 
  
    public final static String RECORDER_SERVICE_BROADCAST_STATE = "is_recording"; 
  
    public final static String RECORDER_SERVICE_BROADCAST_ERROR = "error_code"; 
  
    public final static int NOTIFICATION_ID = 62343234; 
  
    private static MediaRecorder mRecorder = null; 
  
    private static String mFilePath = null; 
  
    private static long mStartTime = 0; 
  
    private RemainingTimeCalculator mRemainingTimeCalculator; 
  
    private NotificationManager mNotifiManager; 
  
    private Notification mLowStorageNotification; 
  
    private TelephonyManager mTeleManager; 
  
    private WakeLock mWakeLock; 
  
    private KeyguardManager mKeyguardManager; 
  
    private final PhoneStateListener mPhoneStateListener = new PhoneStateListener() { 
        @Override 
        public void onCallStateChanged(int state, String incomingNumber) { 
            if (state != TelephonyManager.CALL_STATE_IDLE) { 
                localStopRecording(); 
            } 
        } 
    }; 
  
    private final Handler mHandler = new Handler(); 
  
    private Runnable mUpdateRemainingTime = new Runnable() { 
        public void run() { 
            if (mRecorder != null && mNeedUpdateRemainingTime) { 
                updateRemainingTime(); 
            } 
        } 
    }; 
  
    private boolean mNeedUpdateRemainingTime; 
  
    @Override 
    public void onCreate() { 
        super.onCreate(); 
        mRecorder = null; 
        mLowStorageNotification = null; 
        mRemainingTimeCalculator = new RemainingTimeCalculator(); 
        mNeedUpdateRemainingTime = false; 
        mNotifiManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 
        mTeleManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); 
        mTeleManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE); 
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); 
        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "SoundRecorder"); 
        mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE); 
    } 
  
    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
        Bundle bundle = intent.getExtras(); 
        if (bundle != null && bundle.containsKey(ACTION_NAME)) { 
            switch (bundle.getInt(ACTION_NAME, ACTION_INVALID)) { 
                case ACTION_START_RECORDING: 
                    localStartRecording(bundle.getInt(ACTION_PARAM_FORMAT), 
                            bundle.getString(ACTION_PARAM_PATH), 
                            bundle.getBoolean(ACTION_PARAM_HIGH_QUALITY), 
                            bundle.getLong(ACTION_PARAM_MAX_FILE_SIZE)); 
                    break; 
                case ACTION_STOP_RECORDING: 
                    localStopRecording(); 
                    break; 
                case ACTION_ENABLE_MONITOR_REMAIN_TIME: 
                    if (mRecorder != null) { 
                        mNeedUpdateRemainingTime = true; 
                        mHandler.post(mUpdateRemainingTime); 
                    } 
                    break; 
                case ACTION_DISABLE_MONITOR_REMAIN_TIME: 
                    mNeedUpdateRemainingTime = false; 
                    if (mRecorder != null) { 
                        showRecordingNotification(); 
                    } 
                    break; 
                default: 
                    break; 
            } 
            return START_STICKY; 
        } 
        return super.onStartCommand(intent, flags, startId); 
    } 
  
    @Override 
    public void onDestroy() { 
        mTeleManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE); 
        if (mWakeLock.isHeld()) { 
            mWakeLock.release(); 
        } 
        super.onDestroy(); 
    } 
  
    @Override 
    public IBinder onBind(Intent intent) { 
        return null; 
    } 
  
    @Override 
    public void onLowMemory() { 
        localStopRecording(); 
        super.onLowMemory(); 
    } 
  
    private void localStartRecording(int outputfileformat, String path, boolean highQuality, 
            long maxFileSize) { 
        if (mRecorder == null) { 
            mRemainingTimeCalculator.reset(); 
            if (maxFileSize != -1) { 
                mRemainingTimeCalculator.setFileSizeLimit(new File(path), maxFileSize); 
            } 
  
            mRecorder = new MediaRecorder(); 
            mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
            if (outputfileformat == MediaRecorder.OutputFormat.THREE_GPP) { 
                mRemainingTimeCalculator.setBitRate(SoundRecorder.BITRATE_3GPP); 
                mRecorder.setAudioSamplingRate(highQuality ? 44100 : 22050); 
                mRecorder.setOutputFormat(outputfileformat); 
                mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); 
            } else { 
                mRemainingTimeCalculator.setBitRate(SoundRecorder.BITRATE_AMR); 
                mRecorder.setAudioSamplingRate(highQuality ? 16000 : 8000); 
                mRecorder.setOutputFormat(outputfileformat); 
                mRecorder.setAudioEncoder(highQuality ? MediaRecorder.AudioEncoder.AMR_WB 
                        : MediaRecorder.AudioEncoder.AMR_NB); 
            } 
            mRecorder.setOutputFile(path); 
            mRecorder.setOnErrorListener(this); 
  
            // Handle IOException 
            try { 
                mRecorder.prepare(); 
            } catch (IOException exception) { 
                sendErrorBroadcast(Recorder.INTERNAL_ERROR); 
                mRecorder.reset(); 
                mRecorder.release(); 
                mRecorder = null; 
                return; 
            } 
            // Handle RuntimeException if the recording couldn't start 
            try { 
                mRecorder.start(); 
            } catch (RuntimeException exception) { 
                AudioManager audioMngr = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
                boolean isInCall = (audioMngr.getMode() == AudioManager.MODE_IN_CALL); 
                if (isInCall) { 
                    sendErrorBroadcast(Recorder.IN_CALL_RECORD_ERROR); 
                } else { 
                    sendErrorBroadcast(Recorder.INTERNAL_ERROR); 
                } 
                mRecorder.reset(); 
                mRecorder.release(); 
                mRecorder = null; 
                return; 
            } 
            mFilePath = path; 
            mStartTime = System.currentTimeMillis(); 
            mWakeLock.acquire(); 
            mNeedUpdateRemainingTime = false; 
            sendStateBroadcast(); 
            showRecordingNotification(); 
        } 
    } 
  
    private void localStopRecording() { 
        if (mRecorder != null) { 
            mNeedUpdateRemainingTime = false; 
            try { 
                mRecorder.stop(); 
            } catch (RuntimeException e) { 
            } 
            mRecorder.release(); 
            mRecorder = null; 
  
            sendStateBroadcast(); 
            showStoppedNotification(); 
        } 
        stopSelf(); 
    } 
  
    private void showRecordingNotification() { 
        Notification notification = new Notification(R.drawable.stat_sys_call_record, 
                getString(R.string.notification_recording), System.currentTimeMillis()); 
        notification.flags = Notification.FLAG_ONGOING_EVENT; 
        PendingIntent pendingIntent; 
        pendingIntent = PendingIntent 
                .getActivity(this, 0, new Intent(this, SoundRecorder.class), 0); 
  
        notification.setLatestEventInfo(this, getString(R.string.app_name), 
                getString(R.string.notification_recording), pendingIntent); 
  
        startForeground(NOTIFICATION_ID, notification); 
    } 
  
    private void showLowStorageNotification(int minutes) { 
        if (mKeyguardManager.inKeyguardRestrictedInputMode()) { 
            // it's not necessary to show this notification in lock-screen 
            return; 
        } 
  
        if (mLowStorageNotification == null) { 
            mLowStorageNotification = new Notification(R.drawable.stat_sys_call_record_full, 
                    getString(R.string.notification_recording), System.currentTimeMillis()); 
            mLowStorageNotification.flags = Notification.FLAG_ONGOING_EVENT; 
        } 
  
        PendingIntent pendingIntent; 
        pendingIntent = PendingIntent 
                .getActivity(this, 0, new Intent(this, SoundRecorder.class), 0); 
  
        mLowStorageNotification.setLatestEventInfo(this, getString(R.string.app_name), 
                getString(R.string.notification_warning, minutes), pendingIntent); 
        startForeground(NOTIFICATION_ID, mLowStorageNotification); 
    } 
  
    private void showStoppedNotification() { 
        stopForeground(true); 
        mLowStorageNotification = null; 
  
        Notification notification = new Notification(R.drawable.stat_sys_call_record, 
                getString(R.string.notification_stopped), System.currentTimeMillis()); 
        notification.flags = Notification.FLAG_AUTO_CANCEL; 
        Intent intent = new Intent(Intent.ACTION_VIEW); 
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
        intent.setType("audio/*"); 
        intent.setDataAndType(Uri.fromFile(new File(mFilePath)), "audio/*"); 
  
        PendingIntent pendingIntent; 
        pendingIntent = PendingIntent.getActivity(this, 0, intent, 
                PendingIntent.FLAG_UPDATE_CURRENT); 
  
        notification.setLatestEventInfo(this, getString(R.string.app_name), 
                getString(R.string.notification_stopped), pendingIntent); 
        mNotifiManager.notify(NOTIFICATION_ID, notification); 
    } 
  
    private void sendStateBroadcast() { 
        Intent intent = new Intent(RECORDER_SERVICE_BROADCAST_NAME); 
        intent.putExtra(RECORDER_SERVICE_BROADCAST_STATE, mRecorder != null); 
        sendBroadcast(intent); 
    } 
  
    private void sendErrorBroadcast(int error) { 
        Intent intent = new Intent(RECORDER_SERVICE_BROADCAST_NAME); 
        intent.putExtra(RECORDER_SERVICE_BROADCAST_ERROR, error); 
        sendBroadcast(intent); 
    } 
  
    private void updateRemainingTime() { 
        long t = mRemainingTimeCalculator.timeRemaining(); 
        if (t <= 0) { 
            localStopRecording(); 
            return; 
        } else if (t <= 1800 
                && mRemainingTimeCalculator.currentLowerLimit() != RemainingTimeCalculator.FILE_SIZE_LIMIT) { 
            // less than half one hour 
            showLowStorageNotification((int) Math.ceil(t / 60.0)); 
        } 
  
        if (mRecorder != null && mNeedUpdateRemainingTime) { 
            mHandler.postDelayed(mUpdateRemainingTime, 500); 
        } 
    } 
  
    public static boolean isRecording() { 
        return mRecorder != null; 
    } 
  
    public static String getFilePath() { 
        return mFilePath; 
    } 
  
    public static long getStartTime() { 
        return mStartTime; 
    } 
  
    public static void startRecording(Context context, int outputfileformat, String path, 
            boolean highQuality, long maxFileSize) { 
        Intent intent = new Intent(context, RecorderService.class); 
        intent.putExtra(ACTION_NAME, ACTION_START_RECORDING); 
        intent.putExtra(ACTION_PARAM_FORMAT, outputfileformat); 
        intent.putExtra(ACTION_PARAM_PATH, path); 
        intent.putExtra(ACTION_PARAM_HIGH_QUALITY, highQuality); 
        intent.putExtra(ACTION_PARAM_MAX_FILE_SIZE, maxFileSize); 
        context.startService(intent); 
    } 
  
    public static void stopRecording(Context context) { 
        Intent intent = new Intent(context, RecorderService.class); 
        intent.putExtra(ACTION_NAME, ACTION_STOP_RECORDING); 
        context.startService(intent); 
    } 
  
    public static int getMaxAmplitude() { 
        return mRecorder == null ? 0 : mRecorder.getMaxAmplitude(); 
    } 
  
    @Override 
    public void onError(MediaRecorder mr, int what, int extra) { 
        sendErrorBroadcast(Recorder.INTERNAL_ERROR); 
        localStopRecording(); 
    } 
} 

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