本实例是学习慕课网的《仿微信语音聊天》，得到的代码，尚未做过多的修改，自用

自定义Button

主要实现

1. onTouchEvent的三种状态：被按下，抬起，移动的按钮样式变换及Dialog的更换图片。
2. 处理录音状态，分几种情况

• 按下按钮时间太短以至于未唤醒长按事件
• 按下按钮时间太短以至于录音机还未准备好
• 按下按钮时间太短不到0.6秒（也可以是一秒）
• 正常结束
• 想要取消

3. 回调

• 准备好录音后回调给AudioManger
• activity录好了回调给自己

package com.sjy.myrecorder.view;

import com.sjy.myrecorder.R;
import com.sjy.myrecorder.view.AudioManager.AudioStateListener;

import android.content.Context;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;

public class RecorderButton extends Button implements AudioStateListener {

    private static final int DISTANCE_Y_CANCEL = 50;
    private static final int STATE_NORMAL = 1;
    private static final int STATE_RECORDING = 2;
    private static final int STATE_WANT_TO_CANCEL = 3;
    private AudioManager mAudioManager;
    private boolean mReady = false;
    private String mDir;
    private int mRecState = STATE_NORMAL;
    private boolean isRecording;
    private DialogManager mDialogManager;
    private float mTime;
    public RecorderButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        mDialogManager = new DialogManager(getContext());
        //if(Util.isSdCardReadable()){
            mDir = Environment.getExternalStorageDirectory() + "/collectfun_recorder/";
        //}
        mAudioManager = AudioManager.getInstance(mDir);
        mAudioManager.setOnAudioStateListener(this);
        setOnLongClickListener(new OnLongClickListener() {

            @Override
            public boolean onLongClick(View v) {
                mReady = true;
                mAudioManager.prepareAudio();
                return false;
            }
        });
    }
    /**
     * 录音完成的回调
     * @author asus
     *
     */
    public interface AudioFinishRecordListener {
        void onFinsh(float seconds,String path);
    }
    private AudioFinishRecordListener mListener;
    
    public void setAudioFinishRecordListener(AudioFinishRecordListener listener) {
        mListener = listener;
    }

    private Runnable mGetAudioLevelRunnable = new Runnable() {
        
        @Override
        public void run() {
            while(isRecording) {
                try {
                    Thread.sleep(100);
                mTime += 0.1f;
                    handler.sendEmptyMessage(MSG_VOICE_CHANGED);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
            }
        }
    };
    
    private static final int MSG_AUDIO_PREPARED = 0x110;
    private static final int MSG_VOICE_CHANGED = 0x111;
    private static final int MSG_DIALOG_DISMISS = 0x112;

    private Handler handler = new Handler() {
        public void handleMessage(Message msg) {

            switch (msg.what) {
            case MSG_AUDIO_PREPARED:
                // TODO end preper 后显示
                mDialogManager.showDialog();
                isRecording = true;
                
                new Thread(mGetAudioLevelRunnable).start();
                break;
            case MSG_VOICE_CHANGED:
                mDialogManager.updateVoiceLevel(mAudioManager.getVoiceLevel(7));
                break;
            case MSG_DIALOG_DISMISS:

                break;

            }
        }

    };

    @Override
    public void wellPrepared() {
        handler.sendEmptyMessage(MSG_AUDIO_PREPARED);
    }

    public RecorderButton(Context context) {
        this(context, null);

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        int x = (int) event.getX();
        int y = (int) event.getY();
        int action = event.getAction();

        switch (action) {
        case MotionEvent.ACTION_DOWN:
            changeState(STATE_RECORDING);
            break;
        case MotionEvent.ACTION_MOVE:

            if (isRecording) {
                if (wantTocancel(x, y)) {
                    changeState(STATE_WANT_TO_CANCEL);
                } else {
                    changeState(STATE_RECORDING);
                }
            }
            break;
        case MotionEvent.ACTION_UP:
            if(!mReady) { //未唤起onLongClick
                reset();
                return super.onTouchEvent(event);
            }
            if(!isRecording || mTime < 0.6f) {
                mDialogManager.tooShort();
                mAudioManager.cancel();
                handler.sendEmptyMessageDelayed(MSG_DIALOG_DISMISS, 1300);
            }else if (mRecState == STATE_RECORDING) {//正常录制结束
                mDialogManager.dismissDialog();
                if(mListener != null) {
                    mListener.onFinsh(mTime, mAudioManager.getCurrentFilePath());
                }
                mAudioManager.release();
                
            } else if (mRecState == STATE_WANT_TO_CANCEL) {
                mDialogManager.dismissDialog();
                mAudioManager.cancel();
                
            }
            reset();
            break;
        }

        return super.onTouchEvent(event);
    }

    private void reset() {
        isRecording = false;
        mReady = false;
        mTime = 0;
        changeState(STATE_NORMAL);
    }

    private boolean wantTocancel(int x, int y) {
        if (x < 0 || x > getWidth()) {
            return true;
        }
        if (y < -DISTANCE_Y_CANCEL || y > getHeight() + DISTANCE_Y_CANCEL) {
            return true;
        }

        return false;
    }

    private void changeState(int state) {
        if (state != mRecState) {
            mRecState = state;
            //isRecording = true;
            switch (state) {
            case STATE_NORMAL:
                setBackgroundResource(R.drawable.btn_recorder_normal);
                setText(R.string.str_recorder_normal);
                break;
            case STATE_RECORDING:
                setBackgroundResource(R.drawable.btn_recorder_recording);
                setText(R.string.str_recorder_recording);
                if (isRecording) {
                    mDialogManager.recording();
                }

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

}