【Android學習專題】多媒體篇：MediaRecoder 实现录像机

 

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【Android學習專題】多媒體篇：MediaRecoder 实现录像机

   SkySeraph Feb 9th 2012  SZ

Email：skyseraph00@163.com 

 

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啰嗦：前一篇介绍了MediaRecoder实现的录音机：【Android學習專題】多媒體篇：MediaRecorder 实现录音机 ，这篇介绍录像机的实现。

 

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录像界面

 

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关键步骤

开始录像

录像结束

返回 

屏幕下方计时实现 

 

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完整源码

JAVA源码

public class mediarecorder2 extends Activity implements SurfaceHolder.Callback
{
    private Button mVideoStartBtn,mVideoStopBtn,mVideoReturnBtn;
    private SurfaceView mSurfaceview;         // 显示视频的控件
    private MediaRecorder mMediaRecorder;     // MediaRecorder对象，錄製視頻的類
    private SurfaceHolder mSurfaceHolder;    // 
    private File mRecVedioPath;                // 录制的音視頻文件路徑
    private File mRecAudioFile;                // 录制的音視頻文件
    private TextView tv01,tv02,tv03,tv04,tv05;
    private int hour = 0;
    private int minute = 0;
    private int second = 0;
    private boolean bool;
    
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        /* 全局Activity设置 */
        // 隐去Title（程序的名字）
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        // 設置全屏：隐去电池等图标和一切修饰部分（状态栏部分）
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        // 选择支持半透明模式,在有surfaceview的activity中使用。        
        getWindow().setFormat(PixelFormat.TRANSLUCENT);
        setContentView(R.layout.mymultimedia_mediarecorder2);

        tv01 = (TextView) findViewById(R.id.mediarecorder2_TextView01);
        tv02 = (TextView) findViewById(R.id.mediarecorder2_TextView02);
        tv03 = (TextView) findViewById(R.id.mediarecorder2_TextView03);
        tv04 = (TextView) findViewById(R.id.mediarecorder2_TextView04);
        tv05 = (TextView) findViewById(R.id.mediarecorder2_TextView05);        
        mVideoStartBtn = (Button) findViewById(R.id.mediarecorder2_VideoStartBtn);
        mVideoStopBtn = (Button) findViewById(R.id.mediarecorder2_VideoStopBtn);
        mVideoReturnBtn = (Button) findViewById(R.id.mediarecorder2_VideoReturnBtn);
        mSurfaceview = (SurfaceView) this.findViewById(R.id.mediarecorder2_Surfaceview);
        
        //设置TextView不可见
        tv01.setVisibility(View.GONE);
        tv02.setVisibility(View.GONE);
        tv03.setVisibility(View.GONE);
        tv04.setVisibility(View.GONE);
        tv05.setVisibility(View.GONE);
        
        /* 检测是否存在SD卡 */
        if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
        {
            mRecVedioPath = Environment.getExternalStorageDirectory();// 得到SD卡得路径            
        } else
        {
            Toast.makeText(mediarecorder2.this, "没有SD卡", Toast.LENGTH_LONG).show();
        }        

        //
        SurfaceHolder holder = mSurfaceview.getHolder();        // 取得holder
        holder.addCallback(mediarecorder2.this);                 // holder加入回调接口
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 設置顯示器類型，setType必须设置

// 按钮状态
        mVideoStartBtn.setEnabled(true);
        mVideoStopBtn.setEnabled(false);

        // 開始
        mVideoStartBtn.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                bool = true;
                /* ①Initial：实例化MediaRecorder对象 */
                if(mMediaRecorder == null)
                    mMediaRecorder = new MediaRecorder();
                else
                    mMediaRecorder.reset();
                /* 解決豎屏視頻被旋轉90°的錯誤 
                Camera c = Camera.open();
                Camera.Parameters parameters = c.getParameters();
                parameters.setRotation(90);
                c.setParameters(parameters); 
                c.unlock();        
                mMediaRecorder.setCamera(c);*/
                // 預覽
                mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
                /* ②setAudioSource/setVedioSource */
                mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);// 设置Camera(相机)
                mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                /* ②设置錄製視頻输出格式：THREE_GPP/MPEG-4/RAW_AMR/Default
                 * THREE_GPP(3gp格式，H263视频ARM音频编码)、MPEG-4、RAW_AMR(只支持音频且音频编码要求为AMR_NB)*/
                mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                /* ②设置視頻/音频文件的编码：AAC/AMR_NB/AMR_MB/Default */
                mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
                mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                /* ②设置视频录制的分辨率。必须放在设置编码和格式的后面，否则报错 */
                mMediaRecorder.setVideoSize(176, 144);
                /* ②设置录制的视频帧率。必须放在设置编码和格式的后面，否则报错 */
                mMediaRecorder.setVideoFrameRate(15);                
                /* ②设置输出文件的路径 */                
                try
                {
                    mRecAudioFile = File.createTempFile("Vedio",".3gp",mRecVedioPath);
                } catch (IOException e1)
                {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
                mMediaRecorder.setOutputFile(mRecAudioFile.getAbsolutePath());
                try
                {     
                    /* ③准备 */
                    mMediaRecorder.prepare();
                    tv01.setVisibility(View.VISIBLE);
                    tv02.setVisibility(View.VISIBLE);
                    tv03.setVisibility(View.VISIBLE);
                    tv04.setVisibility(View.VISIBLE);
                    tv05.setVisibility(View.VISIBLE);
                    handler.postDelayed(task, 1000);
                    /* ④开始 */
                    mMediaRecorder.start();
                    /* 按钮状态 */
                    mVideoStartBtn.setEnabled(false);
                    mVideoStopBtn.setEnabled(true);
                    mVideoReturnBtn.setEnabled(true);
                } catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        });
        // 結束
        mVideoStopBtn.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {                
                if (mMediaRecorder != null)
                {
                    /* ⑤停止录音 */
                    mMediaRecorder.stop();
                    bool = false;
                    tv01.setText(format(hour));
                    tv03.setText(format(minute));
                    tv05.setText(format(second));
                    /* ⑥释放MediaRecorder */
                    mMediaRecorder.release();
                    mMediaRecorder = null;
                    /* 按钮状态 */
                    mVideoStartBtn.setEnabled(true);
                    mVideoStopBtn.setEnabled(false);
                    mVideoReturnBtn.setEnabled(true);
                }
            }
        });
        //  返回
        mVideoReturnBtn.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                if(mMediaRecorder != null)
                {
                    mMediaRecorder.stop();
                    mMediaRecorder.release();
                    mMediaRecorder = null;
                }
                finish();
            }
        });
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder)
    {
        // TODO Auto-generated method stub
        mSurfaceHolder = holder;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
    {
        // TODO Auto-generated method stub
        mSurfaceHolder = holder;
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder)
    {
        // TODO Auto-generated method stub
        mSurfaceview = null;
        mSurfaceHolder = null;
        mMediaRecorder = null;
    }
    
    
    /*定时器设置，实现计时*/    
    private Handler handler = new Handler();
    private Runnable task = new Runnable()
    {
        public void run()
        {
            if (bool)
            {
                handler.postDelayed(this, 1000);
                second++;
                if (second < 60)
                {
                    tv05.setText(format(second));
                } else if (second < 3600)
                {
                    minute = second / 60;
                    second = second % 60;
                    tv03.setText(format(minute));
                    tv05.setText(format(second));
                } else
                {
                    hour = second / 3600;
                    minute = (second % 3600) / 60;
                    second = (second % 3600) % 60;
                    tv01.setText(format(hour));
                    tv03.setText(format(minute));
                    tv05.setText(format(second));
                }
            }
        }
    };
    
    /* 格式化时间*/    
    public String format(int i)
    {
        String s = i + "";
        if (s.length() == 1)
        {
            s = "0" + s;
        }
        return s;
    }
}

XML布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1" >

        <SurfaceView
android:id="@+id/mediarecorder2_Surfaceview"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />
    </LinearLayout>

    <LinearLayout
android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="5"
        android:gravity="center"
        android:orientation="vertical" >

        <AbsoluteLayout
android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="2" >

            <TextView
android:id="@+id/mediarecorder2_TextView01"
                android:layout_width="40px"
                android:layout_height="40px"
                android:layout_x="5px"
                android:layout_y="1px"
                android:text="00"
                android:textColor="#ffff0000"
                android:textStyle="bold" >
            </TextView>
            
            <TextView
android:id="@+id/mediarecorder2_TextView02"
                android:layout_width="20px"
                android:layout_height="40px"
                android:layout_x="25px"
                android:layout_y="1px"
                android:text=":"
                android:textColor="#ffff0000"
                android:textStyle="bold" >
            </TextView>
            
            <TextView
android:id="@+id/mediarecorder2_TextView03"
                android:layout_width="40px"
                android:layout_height="40px"
                android:layout_x="35px"
                android:layout_y="1px"
                android:text="00"
                android:textColor="#ffff0000"
                android:textStyle="bold" >
            </TextView>
            
            <TextView
android:id="@+id/mediarecorder2_TextView04"
                android:layout_width="20px"
                android:layout_height="40px"
                android:layout_x="55px"
                android:layout_y="1px"
                android:text=":"
                android:textColor="#ffff0000"
                android:textStyle="bold" >
            </TextView>
            
            <TextView
android:id="@+id/mediarecorder2_TextView05"
                android:layout_width="40px"
                android:layout_height="40px"                
                android:layout_x="65px"
                android:layout_y="1px"
                android:text="00"
                android:textColor="#ffff0000"
                android:textStyle="bold" >
            </TextView>
            
            <TextView
android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_x="350dp"
                android:layout_y="1dp"
                android:text="SkySeraph"
                android:textColor="#ffff00"
                android:textStyle="bold" >
            </TextView>
           
        </AbsoluteLayout>

        <LinearLayout
android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:gravity="center"
            android:orientation="horizontal" >

            <Button
android:id="@+id/mediarecorder2_VideoStartBtn"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_weight="1"
                android:background="@layout/button1"
                android:text="Start" />

            <Button
android:id="@+id/mediarecorder2_VideoStopBtn"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_weight="1"
                android:background="@layout/button1"
                android:text="Stop" />
            
            <Button
android:id="@+id/mediarecorder2_VideoReturnBtn"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_weight="1"
                android:background="@layout/button2"
                android:text="Return" />
        </LinearLayout>
    </LinearLayout>

</LinearLayout>

 

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Refs

1  http://developer.android.com/reference/android/media/MediaRecorder.html

2  http://blog.csdn.net/iamlazybone/article/details/5764118 

3  http://blog.sina.com.cn/s/blog_6111ce890100pouu.html

4  http://blog.csdn.net/peijiangping1989/article/details/7049991

5  http://www.codeproject.com/Articles/107270/Recording-and-Playing-Video-on-Android