Android实现调用手机摄像头录像限制录像时长

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;