Android录音时指针摆动的实现（附源码）

文中的代码主要是移植SoundRecorder的。主要是其中的VUMeter类，VUMeter是通过Recorder.getMaxAmplitude()的值计算，画出指针的偏移摆动。下面直接上代码

/* * Copyright (C) 2011 The Android Open Source Project * * 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 com.android.soundrecorder;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.View;public class VUMeter extends View {    static final float PIVOT_RADIUS = 3.5f;    static final float PIVOT_Y_OFFSET = 10f;    static final float SHADOW_OFFSET = 2.0f;    static final float DROPOFF_STEP = 0.18f;    static final float SURGE_STEP = 0.35f;    static final long  ANIMATION_INTERVAL = 70;        Paint mPaint, mShadow;    float mCurrentAngle;        Recorder mRecorder;    public VUMeter(Context context) {        super(context);        init(context);    }    public VUMeter(Context context, AttributeSet attrs) {        super(context, attrs);        init(context);    }    void init(Context context) {        Drawable background = context.getResources().getDrawable(R.drawable.vumeter);        setBackgroundDrawable(background);                mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setColor(Color.WHITE);        mShadow = new Paint(Paint.ANTI_ALIAS_FLAG);        mShadow.setColor(Color.argb(60, 0, 0, 0));                mRecorder = null;                mCurrentAngle = 0;    }    public void setRecorder(Recorder recorder) {    mRecorder = recorder;    invalidate();    }        @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        final float minAngle = (float)Math.PI/8;        final float maxAngle = (float)Math.PI*7/8;                        float angle = minAngle;        if (mRecorder != null)        angle += (float)(maxAngle - minAngle)*mRecorder.getMaxAmplitude()/32768;        if (angle > mCurrentAngle)            mCurrentAngle = angle;        else            mCurrentAngle = Math.max(angle, mCurrentAngle - DROPOFF_STEP);        mCurrentAngle = Math.min(maxAngle, mCurrentAngle);        float w = getWidth();        float h = getHeight();        float pivotX = w/2;        float pivotY = h - PIVOT_RADIUS - PIVOT_Y_OFFSET;        float l = h*4/5;        float sin = (float) Math.sin(mCurrentAngle);        float cos = (float) Math.cos(mCurrentAngle);        float x0 = pivotX - l*cos;        float y0 = pivotY - l*sin;        canvas.drawLine(x0 + SHADOW_OFFSET, y0 + SHADOW_OFFSET, pivotX + SHADOW_OFFSET, pivotY + SHADOW_OFFSET, mShadow);        canvas.drawCircle(pivotX + SHADOW_OFFSET, pivotY + SHADOW_OFFSET, PIVOT_RADIUS, mShadow);        canvas.drawLine(x0, y0, pivotX, pivotY, mPaint);        canvas.drawCircle(pivotX, pivotY, PIVOT_RADIUS, mPaint);                if (mRecorder != null && mRecorder.state() == Recorder.RECORDING_STATE)        postInvalidateDelayed(ANIMATION_INTERVAL);    }}

录音类：RecordHelper.java

package org.winplus.sh;import java.io.File;import java.io.IOException;import android.content.Context;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaRecorder;import android.media.MediaPlayer.OnCompletionListener;import android.media.MediaPlayer.OnErrorListener;import android.os.Bundle;import android.os.Environment;public class RecordHelper implements OnCompletionListener, OnErrorListener {    static final String SAMPLE_PREFIX = "recording";    static final String SAMPLE_PATH_KEY = "sample_path";    static final String SAMPLE_LENGTH_KEY = "sample_length";    public static final int IDLE_STATE = 0;    public static final int RECORDING_STATE = 1;    public static final int PLAYING_STATE = 2;        int mState = IDLE_STATE;    public static final int NO_ERROR = 0;    public static final int SDCARD_ACCESS_ERROR = 1;    public static final int INTERNAL_ERROR = 2;    public static final int IN_CALL_RECORD_ERROR = 3;        public interface OnStateChangedListener {        public void onStateChanged(int state);        public void onError(int error);    }    OnStateChangedListener mOnStateChangedListener = null;        long mSampleStart = 0;       // time at which latest record or play operation started    int mSampleLength = 0;      // length of current sample    File mSampleFile = null;        MediaRecorder mRecorder = null;    MediaPlayer mPlayer = null;        public RecordHelper() {    }        public void saveState(Bundle recorderState) {        recorderState.putString(SAMPLE_PATH_KEY, mSampleFile.getAbsolutePath());        recorderState.putInt(SAMPLE_LENGTH_KEY, mSampleLength);    }        public int getMaxAmplitude() {        if (mState != RECORDING_STATE)            return 0;        return mRecorder.getMaxAmplitude();    }        public void restoreState(Bundle recorderState) {        String samplePath = recorderState.getString(SAMPLE_PATH_KEY);        if (samplePath == null)            return;        int sampleLength = recorderState.getInt(SAMPLE_LENGTH_KEY, -1);        if (sampleLength == -1)            return;        File file = new File(samplePath);        if (!file.exists())            return;        if (mSampleFile != null                && mSampleFile.getAbsolutePath().compareTo(file.getAbsolutePath()) == 0)            return;                delete();        mSampleFile = file;        mSampleLength = sampleLength;        signalStateChanged(IDLE_STATE);    }        public void setOnStateChangedListener(OnStateChangedListener listener) {        mOnStateChangedListener = listener;    }        public int state() {        return mState;    }        public int progress() {        if (mState == RECORDING_STATE || mState == PLAYING_STATE)            return (int) ((System.currentTimeMillis() - mSampleStart)/1000);        return 0;    }        public int sampleLength() {        return mSampleLength;    }    public File sampleFile() {        return mSampleFile;    }        /**     * Resets the recorder state. If a sample was recorded, the file is deleted.     */    public void delete() {        stop();                if (mSampleFile != null)            mSampleFile.delete();        mSampleFile = null;        mSampleLength = 0;                signalStateChanged(IDLE_STATE);    }        /**     * Resets the recorder state. If a sample was recorded, the file is left on disk and will      * be reused for a new recording.     */    public void clear() {        stop();                mSampleLength = 0;                signalStateChanged(IDLE_STATE);    }        public void startRecording(int outputfileformat, String extension, Context context) {        stop();                if (mSampleFile == null) {            File sampleDir = Environment.getExternalStorageDirectory();            if (!sampleDir.canWrite()) // Workaround for broken sdcard support on the device.                sampleDir = new File("/sdcard/sdcard");                        try {                mSampleFile = File.createTempFile(SAMPLE_PREFIX, extension, sampleDir);            } catch (IOException e) {                setError(SDCARD_ACCESS_ERROR);                return;            }        }                mRecorder = new MediaRecorder();        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        mRecorder.setOutputFormat(outputfileformat);        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        mRecorder.setOutputFile(mSampleFile.getAbsolutePath());        // Handle IOException        try {            mRecorder.prepare();        } catch(IOException exception) {            setError(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)context.getSystemService(Context.AUDIO_SERVICE);            boolean isInCall = ((audioMngr.getMode() == AudioManager.MODE_IN_CALL) ||                    (audioMngr.getMode() == AudioManager.MODE_IN_COMMUNICATION));            if (isInCall) {                setError(IN_CALL_RECORD_ERROR);            } else {                setError(INTERNAL_ERROR);            }            mRecorder.reset();            mRecorder.release();            mRecorder = null;            return;        }        mSampleStart = System.currentTimeMillis();        setState(RECORDING_STATE);    }        public void stopRecording() {        if (mRecorder == null)            return;        mRecorder.stop();        mRecorder.release();        mRecorder = null;        mSampleLength = (int)( (System.currentTimeMillis() - mSampleStart)/1000 );        setState(IDLE_STATE);    }        public void startPlayback() {        stop();                mPlayer = new MediaPlayer();        try {            mPlayer.setDataSource(mSampleFile.getAbsolutePath());            mPlayer.setOnCompletionListener(this);            mPlayer.setOnErrorListener(this);            mPlayer.prepare();            mPlayer.start();        } catch (IllegalArgumentException e) {            setError(INTERNAL_ERROR);            mPlayer = null;            return;        } catch (IOException e) {            setError(SDCARD_ACCESS_ERROR);            mPlayer = null;            return;        }                mSampleStart = System.currentTimeMillis();        setState(PLAYING_STATE);    }        public void stopPlayback() {        if (mPlayer == null) // we were not in playback            return;        mPlayer.stop();        mPlayer.release();        mPlayer = null;        setState(IDLE_STATE);    }        public void stop() {        stopRecording();        stopPlayback();    }    public boolean onError(MediaPlayer mp, int what, int extra) {        stop();        setError(SDCARD_ACCESS_ERROR);        return true;    }    public void onCompletion(MediaPlayer mp) {        stop();    }        private void setState(int state) {        if (state == mState)            return;                mState = state;        signalStateChanged(mState);    }        private void signalStateChanged(int state) {        if (mOnStateChangedListener != null)            mOnStateChangedListener.onStateChanged(state);    }        private void setError(int error) {        if (mOnStateChangedListener != null)            mOnStateChangedListener.onError(error);    }}

界面：

package org.winplus.sh;import android.app.Activity;import android.content.Context;import android.media.MediaRecorder;import android.os.Bundle;import android.os.PowerManager;import android.os.PowerManager.WakeLock;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class SoundHandActivity extends Activity implements OnClickListener,RecordHelper.OnStateChangedListener {private static final String TAG = "SoundHandActivity";private VUMeter mVUMeter;private RecordHelper mRecorder;private Button btnStart;private Button btnStop;WakeLock mWakeLock;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);setupViews();}public void setupViews() {PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);mWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK,"SoundRecorder");mRecorder = new RecordHelper();mRecorder.setOnStateChangedListener(this);mVUMeter = (VUMeter) findViewById(R.id.uvMeter);mVUMeter.setRecorder(mRecorder);btnStart = (Button) findViewById(R.id.button1);btnStop = (Button) findViewById(R.id.button2);btnStart.setOnClickListener(this);btnStop.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.button1:mRecorder.startRecording(MediaRecorder.OutputFormat.AMR_NB, ".amr",this);break;case R.id.button2:mRecorder.stop();break;}}private void updateUi() {Log.e(TAG, "=======================updateUi");mVUMeter.invalidate();}@Overridepublic void onStateChanged(int state) {if (state == RecordHelper.PLAYING_STATE|| state == RecordHelper.RECORDING_STATE) {mWakeLock.acquire(); // we don't want to go to sleep while recording// or playing} else {if (mWakeLock.isHeld())mWakeLock.release();} updateUi();}@Overridepublic void onError(int error) {// TODO Auto-generated method stub}}

OK,没有什么特别的。

源码下载==》

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