Android 实现预览，录像，拍照

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.CamcorderProfile;
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="aaa";

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+".jpg");
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.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_720P));
File videoFile = new File(path, fileName+".3gp"); //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+".3gp");
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
if(myCamera == null)
{
myCamera = Camera.open();
try {
myCamera.setPreviewDisplay(holder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub

//关闭预览并释放资源
if(myCamera!=null)
{
myCamera.stopPreview();
myCamera.release();
myCamera = null;
}
if(mediaRecorder!=null)
{
mediaRecorder.release(); //----
mediaRecorder = null;
}

}
@Override
public void onClick(View v) {
Camera.Parameters params = myCamera.getParameters();
params.setPictureFormat(PixelFormat.JPEG);
myCamera.setParameters(params);
myCamera.takePicture(null, null, jpeg);
}
@Override
public void onAutoFocus(boolean success, Camera camera) {
// TODO Auto-generated method stub
if(success)
{
//设置参数,并拍照
Camera.Parameters params = myCamera.getParameters();
params.setPictureFormat(PixelFormat.JPEG);
myCamera.setParameters(params);
myCamera.takePicture(null, null, jpeg);
}

}
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="#ffffff"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<SurfaceView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/surfaceView1"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:text="删除"
android:id="@+id/c_del"
android:visibility="gone"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="开始录像"
android:id="@+id/c_recode"
/>

<Button android:id="@+id/c_stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="停止录像" />
</LinearLayout>

</FrameLayout>

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.microphone"