MyRecorder(仿微信，录制音频并发送功能)

①布局实现(activity_main.xml)
布局采用线性布局，上面使用的一个ListView,下面使用的是一个自定义的Button(会在下面进行介绍)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.yitong.myrecorder.MainActivity">

    <ListView
        android:id="@+id/main_listview"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="#ebebeb"
        android:dividerHeight="10dp"
        android:divider="@null"
        />
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff">
        <com.yitong.myrecorder.view.AudioRecorderButton
            android:id="@+id/main_btn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:layout_marginTop="6dp"
            android:layout_marginBottom="6dp"
            android:layout_marginLeft="60dp"
            android:layout_marginRight="60dp"
            android:minHeight="0dp"
            android:padding="6dp"
            android:text="@string/str_recoder_normal"
            android:textSize="20sp"
            android:textColor="#727272"
            android:background="@drawable/btn_recorder_normal"
            />
        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#ccc"/>
    </FrameLayout>
</LinearLayout>
相关使用的string值(需要添加到value/string中)：
    <string name="str_recoder_normal">按住说话</string>
    <string name="str_recorder_recording">松开结束</string>
    <string name="str_recorder_want_cancel">松开手指，取消发送</string>
    <string name="str_dialog_want_cancel">手指上滑，取消发送</string>
    <string name="str_dialog_want_send">手指上滑，取消发送</string>
    <string name="str_dialog_time_short">录音时间过短</string>

②我们分析一下自定Button的几种状态：
1.正常状态 (在初次显示，即没有点击的时候显示的状态，显示的文本为“按住说话”)
2.录音状态 (当手指按在Button上时，即为录音状态，显示的文本为“松开结束”)
3.取消状态 (当手指上滑，此时若松开手指，便取消发送，即为取消状态，显示的文本为“松开手指，取消发送”)

③当录音状态时，在View上有一个Dialog的提示，首先我们先自定义这个Dialog的布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:background="@drawable/dialog_bg"
              android:orientation="vertical"
              android:padding="20dp">
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/main_recorder_dialog_icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/recorder"
            android:visibility="visible"/>

        <ImageView
            android:id="@+id/main_recorder_dialog_voice"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/v1"
            android:visibility="visible"/>
    </LinearLayout>

    <TextView
        android:id="@+id/main_recorder_dialog_label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="5dp"
        android:text="@string/str_dialog_want_cancel"
        android:textColor="#fff"
        android:textSize="20sp"/>
</LinearLayout>
其中用到的@drawable/dialog_bg即为自定的shape
    <?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
           android:shape="rectangle">
        <corners android:radius="12dp"/>
        <solid android:color="#a3d7f5"/>
        <stroke
            android:width="1dp"
            android:color="#9b9b9b"/>
    </shape>

④定义DialogManager,便于对这个自定义布局的Dialog进行操作

public class DialogManager {

    private static final String TAG = "DialogManager";
    private Dialog mDialog;
    private ImageView mIcon;
    private ImageView mVoice;
    private TextView mLabel;

    private Context mContext;

    public DialogManager(Context mContext) {
        this.mContext = mContext;
    }

    /**
     * 显示对话框
     */
    public void showRecordeingDialog() {
        mDialog = new Dialog(mContext, R.style.Theme_AudioDialog);
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(mContext.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.dialog, null);
        mDialog.setContentView(view);

        mIcon = (ImageView) mDialog.findViewById(R.id.main_recorder_dialog_icon);
        mVoice = (ImageView) mDialog.findViewById(R.id.main_recorder_dialog_voice);
        mLabel = (TextView) mDialog.findViewById(R.id.main_recorder_dialog_label);

        mDialog.show();
    }

    /**
     * 正在录制提示
     */
    public void recording() {
        if (mDialog != null && mDialog.isShowing()) {
            mIcon.setVisibility(View.VISIBLE);
            mVoice.setVisibility(View.VISIBLE);
            mLabel.setVisibility(View.VISIBLE);
            mIcon.setImageResource(R.mipmap.recorder);
            mLabel.setText(R.string.str_dialog_want_send);
        }
    }

    /**
     * 取消录制对话框提示
     */
    public void wantToCancel() {
        if (mDialog != null && mDialog.isShowing()) {
            mIcon.setVisibility(View.VISIBLE);
            mVoice.setVisibility(View.VISIBLE);
            mLabel.setVisibility(View.VISIBLE);
            mIcon.setImageResource(R.mipmap.recorder);
            mLabel.setText(R.string.str_recorder_want_cancel);
        }
    }

    /**
     * 录音时间过短提示
     */
    public void tooShort() {
        if (mDialog != null && mDialog.isShowing()) {
            mIcon.setVisibility(View.VISIBLE);
            mVoice.setVisibility(View.VISIBLE);
            mLabel.setVisibility(View.VISIBLE);
            mIcon.setImageResource(R.mipmap.recorder);
            mLabel.setText(R.string.str_dialog_time_short);
        }
    }

    /**
     * 取消对话框
     */
    public void dismissDialog() {
        if (mDialog != null && mDialog.isShowing()) {
            mDialog.dismiss();
            mDialog = null;
        }
    }

    /**
     * 显示音量大小
     */
    public void updateVoiceLevel(int level) {
        if (mDialog != null && mDialog.isShowing()) {
            int resId = mContext.getResources().getIdentifier("v" + level, "mipmap", mContext.getPackageName());
            mVoice.setImageResource(resId);
        }
    }
}

Dialog的样式Theme_AudioDialog,需要在values/styles.xml中定义
    <style name="Theme_AudioDialog">
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowFrame">@null</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:backgroundDimEnabled">false</item>
    </style>

⑤当手指按住Button时，便开始录音，所以我们还需要定义一个录音的管理类AudioManager来控制录制状态。

public class AudioManager {

    private MediaRecorder mMediaRecorder;
    private String mDir;// 保存的目录

    private String mCurrentFilePath;// 保存音频文件的全路径

    private boolean isPrepared = false;// 是否准备完毕

    private AudioManager(String dir) {
        mDir = dir;
    }

    private static AudioManager mInstance;

    public static AudioManager getmInstance(String mDir) {
        if (mInstance == null) {
            synchronized (AudioManager.class) {
                if (mInstance == null) {
                    mInstance = new AudioManager(mDir);
                }
            }
        }
        return mInstance;
    }

    /**
     * 准备完毕的回调
     */
    public interface AudioStateListener {
        void wellPrepared();
    }

    private AudioStateListener mListener;

    public void setAudioStateListener(AudioStateListener listener) {
        mListener = listener;
    }

    /** 准备录制 */
    public void prepareAudio() {
        try {
            isPrepared = false;
            File dir = new File(mDir);
            if (!dir.exists()) {
                dir.mkdirs();
            }

            String fileName = generateName();
            File file = new File(dir, fileName);
            mCurrentFilePath = file.getAbsolutePath();

            mMediaRecorder = new MediaRecorder();
            // 设置输出文件
            mMediaRecorder.setOutputFile(mCurrentFilePath);
            // 设置音频源为麦克风
            mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            // 设置音频格式
            mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
            // 设置音频编码
            mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

            mMediaRecorder.prepare();
            mMediaRecorder.start();

            isPrepared = true;
            if (mListener != null) {
                mListener.wellPrepared();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /** 获取音量大小 */
    public int getVoiceLevel(int maxLevel) {
        if (isPrepared) {
            try {
                //mMediaRecorder.getMaxAmplitude() 1-32767
                //注意此处mMediaRecorder.getMaxAmplitude 只能取一次，如果前面取了一次，后边再取就为0了
                return ((mMediaRecorder.getMaxAmplitude() * maxLevel) / 32768) + 1;
            } catch (Exception e) {
            }

        }
        return 1;
    }

    /** 保存录音，释放资源 */
    public void release() {
        if(mMediaRecorder != null) {
            mMediaRecorder.stop();
            mMediaRecorder.release();
            mMediaRecorder = null;
        }
    }

    /** 取消录制 */
    public void cancel() {
        release();
        if(mCurrentFilePath != null) {
            File file = new File(mCurrentFilePath);
            if(file.exists()) {
                file.delete();
                mCurrentFilePath = null;
            }
        }
    }

    /** 获取录制音频的总路径 */
    public String getmCurrentFilePath(){
        return mCurrentFilePath;
    }

    /**
     * 生成一个随机名字
     */
    private String generateName() {
        return UUID.randomUUID().toString() + ".mp3";
    }
}

⑥处理完DialogManager和AudioManger后，接着我们回到自定义的Button，即AudioRecorderButton

public class AudioRecorderButton extends Button implements AudioManager.AudioStateListener {

    private static final int STATE_NORMAL = 1;//正常状态
    private static final int STATE_RECORDING = 2;//录音状态
    private static final int STATE_WANT_TO_CANCEL = 3;//取消状态
    private static final String TAG = "AudioRecorderButton";

    private int mCurState = STATE_NORMAL;//当前状态
    private boolean isRecording = false;//是否正在录音

    private DialogManager mDialogManger;
    private AudioManager mAudioManager;

    private boolean mReady = false;//是否触发longClick
    private float mTime;//计时

    public AudioRecorderButton(Context context) {
        this(context, null);
    }

    public AudioRecorderButton(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AudioRecorderButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mDialogManger = new DialogManager(getContext());

        String dir = Environment.getExternalStorageDirectory() + "/my_recorder_audios";
        mAudioManager = AudioManager.getmInstance(dir);
        mAudioManager.setAudioStateListener(this);

        setOnLongClickListener(new OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                mReady = true;
                mAudioManager.prepareAudio();
                return false;
            }
        });
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int x = (int) event.getX();
        int y = (int) event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                changeSate(STATE_RECORDING);
                break;

            case MotionEvent.ACTION_MOVE:
                if (isRecording) {
                    if (isCancelRecorder(x, y)) {
                        changeSate(STATE_WANT_TO_CANCEL);
                    } else {
                        changeSate(STATE_RECORDING);
                    }
                }
                break;

            case MotionEvent.ACTION_UP:
                if (!mReady) {
                    reset();
                    return super.onTouchEvent(event);
                }
                if (!isRecording || mTime < 0.6f) {
                    mDialogManger.tooShort();
                    mAudioManager.cancel();
                    mHandler.sendEmptyMessageDelayed(MSG_LODING_DISMISS, 1000);
                } else if (mCurState == STATE_RECORDING) {//正常录制结束
                    mDialogManger.dismissDialog();
                    mAudioManager.release();
                    if (mListener != null) {
                        mListener.onFinish(mTime, mAudioManager.getmCurrentFilePath());
                    }
                } else if (mCurState == STATE_WANT_TO_CANCEL) {
                    mDialogManger.dismissDialog();
                    mAudioManager.cancel();
                }
                reset();
                break;
        }
        return super.onTouchEvent(event);
    }

    /**
     * 根据不同状态，更改不同的文字和显示的背景
     */
    private void changeSate(int stateRecording) {
        if (mCurState != stateRecording) {
            mCurState = stateRecording;
            switch (mCurState) {
                case STATE_NORMAL:
                    setBackgroundResource(R.drawable.btn_recorder_normal);
                    setText(R.string.str_recoder_normal);
                    break;

                case STATE_RECORDING:
                    setBackgroundResource(R.drawable.btn_recording);
                    setText(R.string.str_recorder_recording);
                    if (isRecording) {
                        mDialogManger.recording();
                    }
                    break;

                case STATE_WANT_TO_CANCEL:
                    setBackgroundResource(R.drawable.btn_recording);
                    setText(R.string.str_recorder_want_cancel);
                    mDialogManger.wantToCancel();
                    break;
            }
        }
    }

    /**
     * 根据移动后的位置，判断是否取消录音
     */
    private boolean isCancelRecorder(int x, int y) {
        if (x < 0 || x > getWidth() || y < 0 || y > getHeight()) {
            return true;
        }
        return false;
    }

    /**
     * 重置标识位
     */
    private void reset() {
        changeSate(STATE_NORMAL);
        isRecording = false;
        mReady = false;
        mTime = 0;
    }

    /**
     * 开始播放时回调此方法
     */
    @Override
    public void wellPrepared() {
        mHandler.sendEmptyMessage(MSG_AUDIO_PREPARED);
    }

    private static final int MSG_AUDIO_PREPARED = 0x110;
    private static final int MSG_VOICE_CHAGE = 0x111;
    private static final int MSG_LODING_DISMISS = 0x112;

    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case MSG_AUDIO_PREPARED:
                    mDialogManger.showRecordeingDialog();
                    isRecording = true;
                    new Thread(mGetVoiceLevelRunnable).start();
                    break;

                case MSG_VOICE_CHAGE:
                    mDialogManger.updateVoiceLevel(mAudioManager.getVoiceLevel(7));
                    break;

                case MSG_LODING_DISMISS:
                    mDialogManger.dismissDialog();
                    break;
            }
        }
    };

    /**
     * 获取音量大小，并计时
     */
    private Runnable mGetVoiceLevelRunnable = new Runnable() {
        @Override
        public void run() {
            while (isRecording) {
                SystemClock.sleep(100);
                mTime += 0.1f;
                mHandler.sendEmptyMessage(MSG_VOICE_CHAGE);
            }
        }
    };

    /**
     * 完成录制后的回调接口
     */
    public interface AudioFinishRecorderListener {
        void onFinish(float time, String filePath);
    }

    private AudioFinishRecorderListener mListener;

    public void setAudioFinishRecorderListener(AudioFinishRecorderListener listener) {
        mListener = listener;
    }
}

=====================至此自定义Button就定义完===================================

①接着我们回到了MainActivity,我们需要获取ListView和AudioRecorderButton组件。对于ListView,需要定义Adapter,当点击某个条目的需要把录制的音频播放出来，需要定义一个MediaManager来控制音频的播放。

②首先我们先定义RecorderAdapter

/**
 * 音频实体类，包含音频的长度和保存的路径
 */
public class Recorder implements Serializable {
    private int time;
    private String filePath;

    public Recorder() {
    }

    public Recorder(int time, String filePath) {
        this.time = time;
        this.filePath = filePath;
    }

    public void setTime(int time) {
        this.time = time;
    }

    public void setFilePath(String filePath) {
        this.filePath = filePath;
    }

    public float getTime() {
        return time;
    }

    public String getFilePath() {
        return filePath;
    }
}

/**
 * 继承ArrayAdater,重写getView方法
 */
public class RecorderAdapter extends ArrayAdapter<Recorder> {

    private List<Recorder> mDatas;
    private Context mContext;

    private LayoutInflater mInfalter;

    private int mMinItemWidhth;
    private int mMaxItemWidhth;

    public RecorderAdapter(Context context, List<Recorder> datas) {
        super(context, -1, datas);
        mDatas = datas;
        mContext = context;

        mInfalter = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);

        mMaxItemWidhth = (int) (outMetrics.widthPixels * 0.7f);
        mMinItemWidhth = (int) (outMetrics.widthPixels * 0.15f);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = new ViewHolder();
        if(convertView == null) {
            convertView = mInfalter.inflate(R.layout.item_recorder, null);
        }
        holder = holder.getHolder(convertView);
        holder.setView(holder, mDatas.get(position));
        return convertView;
    }

    private class ViewHolder{
        TextView time;
        View length;

        public ViewHolder getHolder(View view){
            ViewHolder holder = (ViewHolder) view.getTag();
            if(holder == null) {
                holder = new ViewHolder();
            }
            holder.time = (TextView) view.findViewById(R.id.item_recorder_time);
            holder.length = view.findViewById(R.id.item_recorder_length);
            view.setTag(holder);

            return holder;
        }

        public void setView(ViewHolder holder, Recorder recorder) {
            holder.time.setText(recorder.getTime() + "\"");
            ViewGroup.LayoutParams layoutParams = holder.length.getLayoutParams();
            layoutParams.width = (int) (mMinItemWidhth + (mMaxItemWidhth / 60f * recorder.getTime()));
        }
    }
}

③定义MediaManger,用于播放音频

public class MediaManager {

    private static MediaPlayer mMediaPlayer;

    private static boolean isPause = false;//是否是暂停

    /**
     * 播放音频
     */
    public static void playSound(String filePath, MediaPlayer.OnCompletionListener onCompletionListener) {
        if (mMediaPlayer == null) {
            mMediaPlayer = new MediaPlayer();
            mMediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
                @Override
                public boolean onError(MediaPlayer mp, int what, int extra) {
                    mMediaPlayer.reset();
                    return false;
                }
            });
        } else {
            mMediaPlayer.reset();
        }

        try {
            mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mMediaPlayer.setOnCompletionListener(onCompletionListener);
            mMediaPlayer.setDataSource(filePath);
            mMediaPlayer.prepare();
            mMediaPlayer.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 暂停
     */
    public static void pause() {
        if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
            isPause = true;
        }
    }

    /**
     * 继续
     */
    public static void resume() {
        if (mMediaPlayer != null && isPause) {
            mMediaPlayer.start();
            isPause = false;
        }
    }

    /**
     * 释放资源
     */
    public static void release() {
        if (mMediaPlayer != null) {
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

}

④MainActivity的实现

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    private List<Recorder> mDatas = new ArrayList<Recorder>();

    private AudioRecorderButton mAudioRecorderButton;
    private ListView mListView;
    private RecorderAdapter mAdapter;
    private View mAnimView;

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

    private void initView() {
        mAudioRecorderButton = (AudioRecorderButton) findViewById(R.id.main_btn);
        mListView = (ListView) findViewById(R.id.main_listview);
    }

    private void initAction() {
        mAudioRecorderButton.setAudioFinishRecorderListener(new AudioRecorderButton.AudioFinishRecorderListener() {
            @Override
            public void onFinish(float time, String filePath) {
                Recorder recorder = new Recorder((int)time, filePath);
                mDatas.add(recorder);
                mAdapter.notifyDataSetChanged();
                mListView.setSelection(mDatas.size() - 1);
            }
        });
        mAdapter = new RecorderAdapter(this, mDatas);
        mListView.setAdapter(mAdapter);

        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // 播放帧动画
                mAnimView = view.findViewById(R.id.item_anim);
                mAnimView.setBackgroundResource(R.drawable.play_anim);
                AnimationDrawable anim = (AnimationDrawable) mAnimView.getBackground();
                anim.start();

                // 播放音频
                MediaManager.playSound(mDatas.get(position).getFilePath(), new MediaPlayer.OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        mAnimView.setBackgroundResource(R.mipmap.adj);
                    }
                });
            }
        });
    }

    @Override
    protected void onPause() {
        super.onPause();
        MediaManager.pause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        MediaManager.resume();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        MediaManager.release();
    }
}

帧动画play_anim定义在drawable下
    <?xml version="1.0" encoding="utf-8"?>
    <animation-list xmlns:android="http://schemas.android.com/apk/res/android"
        >
        <item
            android:drawable="@mipmap/v_anim1"
            android:duration="300"/>
        <item
            android:drawable="@mipmap/v_anim2"
            android:duration="300"/>
        <item
            android:drawable="@mipmap/v_anim3"
            android:duration="300"/>
    </animation-list>

⑤最后，不要忘了添加权限

<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

⑥如果有哪里不懂，可以留言，博主会积极解答。源码下载，博主用的是as开发的