Android如何实现调用手机摄像头录像限制录像时长

小编给大家分享一下Android如何实现调用手机摄像头录像限制录像时长，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

具体内容如下

因为服务器空间有限，所以视频时长必须有所限制。

在xml中先布局一个按钮，点击开始录频。布局一个TextView用于显示倒计时的时间。

一、使用Hander+TimerTask完成定时操作

private TextView btn_stop;private int recLen = 11;Timer timer = new Timer();//时间倒计时放在开始按钮事件后，看标题7那里是时间倒计时开始的时候//timer.schedule(task,1000,1000);final Handler handler = new Handler(){        @Override        public void handleMessage(Message msg){            switch (msg.what){                case 1:                    btn_stop.setText(""+recLen);                    if(recLen<0){                        timer.cancel();                        btn_stop.setVisibility(View.GONE);                    }            }        }    };     TimerTask task = new TimerTask() {        @Override        public void run() {            recLen--;            Message message = new Message();            message.what = 1;            handler.sendMessage(message);             //当倒计时时间到1的时候关闭录像            if (recLen == 1){                customTimer.Stop();                stopRecord();            }        }    };

二、初始化摄像头

private void initCamera() {        mCamera = Camera.open(0);  //①        mCamera.setDisplayOrientation(90);        try {            mCamera.setPreviewDisplay(mSurfaceHolder);             mCamera.cancelAutoFocus();//此句加上 可自动聚焦 必须加            Camera.Parameters parameters = mCamera.getParameters();            //查询摄像头支持的分辨率            parameters.getSupportedPreviewSizes();            for (int i = 0; i < parameters.getSupportedPreviewSizes().size(); i++) {                Log.i("<><><><>Width", parameters.getSupportedPreviewSizes().get(i).width + "");                Log.i("<><><><>Height", parameters.getSupportedPreviewSizes().get(i).height + "");            }            //设置分辨率            parameters.setPreviewSize(1280, 720);            //设置聚焦模式            parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);            //缩短Recording启动时间            parameters.setRecordingHint(true);            //是否支持影像稳定能力，支持则开启            if (parameters.isVideoStabilizationSupported())                parameters.setVideoStabilization(true);            mCamera.setParameters(parameters);            mCamera.startPreview();        } catch (Exception e) {            Log.i(TAG, "Error starting camera preview: " + e.getMessage());        }    }

三、创建视频文件

private boolean createRecordDir() {        if (!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {            Toast.makeText(this, "SD卡不存在!", Toast.LENGTH_SHORT).show();            return false;        }         File sampleDir = new File("/sdcard/myVideo/");        if (!sampleDir.exists()) {            sampleDir.mkdirs();        }        videoName = "VID_" + DateUtils.getData(DateUtils.FORMAT_YYYYMMDDHHMMSS) + ".mp4";        mVecordFile = new File(sampleDir, videoName);        return true;    }

四、配置MediaRecorder

private void setConfigRecord() {        mediaRecorder = new MediaRecorder();        mediaRecorder.reset();        mediaRecorder.setCamera(mCamera);        mediaRecorder.setOnErrorListener(onErrorListener);        //录像角度        mediaRecorder.setOrientationHint(90);        //使用SurfaceView预览        mediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());        //1.设置采集声音        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        //设置采集图像        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);        //2.设置视频，音频的输出格式 mp4        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);        //3.设置音频的编码格式        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);        //设置图像的编码格式        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);        CamcorderProfile mProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_480P);         mediaRecorder.setAudioEncodingBitRate(44100);        if (mProfile.videoBitRate > 2 * 1024 * 1024) {            mediaRecorder.setVideoEncodingBitRate(2 * 1024 * 1024);        } else {            mediaRecorder.setVideoEncodingBitRate(1024 * 1024);        }        mediaRecorder.setVideoFrameRate(mProfile.videoFrameRate);        mediaRecorder.setVideoSize(1280, 720);         mediaRecorder.setOutputFile(mVecordFile.getAbsolutePath());    }

五、停止录制

private void stopRecord() {        try {            if (isRecording && mediaRecorder != null) {                 mediaRecorder.setOnErrorListener(null);                mediaRecorder.setPreviewDisplay(null);                mediaRecorder.stop();                mediaRecorder.reset();                mediaRecorder.release();                mediaRecorder = null;                isRecording = false;                Log.i(TAG, "" + mVecordFile.toString());                //new imageTask().execute(mVecordFile);                 MessageData md = new MessageData();                md.srdatatype = SRDataType.录像返回;                md.Data = mVecordFile.getAbsolutePath();                 Intent intent = new Intent(BroadCastParameter.action);                intent.putExtra("data", md);                sendBroadcast(intent);                // Fragment页面广播通知                LocalBroadcastManager.getInstance(CustomRecorder.this).sendBroadcast(intent);                 finish();            }        }catch (Exception ex)        {            //Toast.makeText(getApplicationContext(),ex.getMessage(),1).show();        }    }

六、关闭摄像头

private void stopCamera() {        if (mCamera != null) {            mCamera.setPreviewCallback(null);            mCamera.stopPreview();            mCamera.release();            mCamera = null;        }    }

七、点击开始录像按钮

public void onViewClicked(View view) {        if (Build.VERSION.SDK_INT >= 23) {            int REQUEST_CODE_CONTACT = 101;             //验证是否许可权限            for (String str : permissions) {                if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {                    Toast.makeText(getApplicationContext(),"存储权限未授权",1).show();                    return;                }            }        }        switch (view.getId()) {            //开始            case R.id.btn_start:                btn_start.setVisibility(View.GONE);                btn_stop.setVisibility(View.VISIBLE);                 //这是是判断视频文件有没有创建,如果没有就返回                boolean creakOk = createRecordDir();                if (!creakOk) {                    return;                }                 try {                    mCamera.unlock();                    setConfigRecord();                     mediaRecorder.prepare();                    mediaRecorder.start();                } catch (Exception e) {                    //Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_LONG).show();                }                 StartTime = new Date(System.currentTimeMillis());                isRecording = true;                customTimer.ReStart();                 timer.schedule(task,1000,1000);                break;

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