Android带预览功能的录像源代码

package com.demo; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.ContentResolver; import android.content.Intent; import android.content.pm.ActivityInfo; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.PixelFormat; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.PictureCallback; import android.media.MediaRecorder; import android.media.ThumbnailUtils; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.provider.MediaStore; import android.util.DisplayMetrics; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.Window; import android.view.SurfaceHolder.Callback; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; public class CameraVideo extends Activity implements Callback, OnClickListener, AutoFocusCallback{ Button del,c_recode,c_stop; //----- String exerciseId="mycamera"; // EditText upfilename; SurfaceView mySurfaceView;//surfaceView声明 SurfaceHolder holder;//surfaceHolder声明 Camera myCamera;//相机声明 String filePath=Environment.getExternalStorageDirectory().toString()+"/"+exerciseId+"/" ;// 照片保存文件夹 String fileName=""; private MediaRecorder mediaRecorder; //----- private boolean record; //----- String path = Environment.getExternalStorageDirectory()+"/"+exerciseId; //保存路径//----- SimpleDateFormat format1; //创建jpeg图片回调数据对象 PictureCallback jpeg = new PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { // TODO Auto-generated method stub try {// 获得图片 Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length); File file = new File(filePath+fileName); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file)); bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);//将图片压缩到流中 bos.flush();//输出 bos.close();//关闭 }catch(Exception e) { e.printStackTrace(); } } }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); format1 = new SimpleDateFormat("yyyyMMddHHmmss"); /*在SD卡上创建目录*/ File eis = new File(Environment.getExternalStorageDirectory().toString()+"/"+exerciseId+"/"); try { if(!eis.exists()) { eis.mkdir(); } } catch(Exception e) { } requestWindowFeature(Window.FEATURE_NO_TITLE);//无标题 setContentView(R.layout.camera_layout); //获得控件 mySurfaceView = (SurfaceView)findViewById(R.id.surfaceView1); //获得句柄 holder = mySurfaceView.getHolder(); //添加回调 holder.addCallback(this); //设置类型 holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); //设置监听 mySurfaceView.setOnClickListener(this); del = (Button)findViewById(R.id.c_del); //删除按钮 c_recode = (Button)findViewById(R.id.c_recode); //开始 录像//----- c_stop = (Button)findViewById(R.id.c_stop); //停止 录像//----- //开始 c_recode.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //关闭预览并释放资源 myCamera.stopPreview(); myCamera.release(); myCamera = null; if(mediaRecorder == null) { mediaRecorder = new MediaRecorder(); //----- } fileName = format1.format(new Date()); mediaRecorder.reset(); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); //从照相机采集视频 mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); /*引用android.util.DisplayMetrics 获取分辨率*/ DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); // mediaRecorder.setVideoSize(dm.widthPixels, dm.heightPixels); mediaRecorder.setVideoFrameRate(15); //每秒3帧 mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); //设置视频编码方式 mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); //设置音频编码方式 File videoFile = new File(path, fileName+".mp4"); //保存路径及名称 mediaRecorder.setOutputFile(videoFile.getAbsolutePath()); mediaRecorder.setPreviewDisplay(holder.getSurface()); try { mediaRecorder.prepare();//预期准备 } catch (Exception e) { e.printStackTrace(); } mediaRecorder.start();//开始刻录 record = true; }}); //停止 c_stop.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // CameraVideo.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); if(record){ mediaRecorder.stop(); mediaRecorder.release(); mediaRecorder=null; record = false; //开启相机 if(myCamera == null) { myCamera = Camera.open(); try { myCamera.setPreviewDisplay(holder); } catch (IOException e) { e.printStackTrace(); } } Camera.Parameters params = myCamera.getParameters(); params.setPictureFormat(PixelFormat.JPEG); // myCamera.setDisplayOrientation(90); myCamera.setParameters(params); myCamera.startPreview(); //开启预览 } }}); //删除 del.setOnClickListener( new OnClickListener() { public void onClick(View v) { //删除录像 File file = new File(path+fileName+".mp4"); try { file.delete(); Toast.makeText(CameraVideo.this, "删除完成", 1).show(); myCamera.startPreview();//开启预览 del.setVisibility(View.GONE); //刷新媒体库 sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory()+"/"+exerciseId))); } catch(Exception e) { } }}); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub //设置参数并开始预览 Camera.Parameters params = myCamera.getParameters(); params.setPictureFormat(PixelFormat.JPEG); myCamera.setParameters(params); myCamera.startPreview(); } @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub //开启相机