第二种方法，利用Camera API进行调用照相机

1.首先需要添加权限：

<uses-permission android:name=”android.permission.CAMERA”>

2.运行结果，图片旋转了90度，需要在ACTIVITY的onCreate的当下旋转Activity的方向：

This.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

package com.cameraapi;

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 java.util.List;

import android.os.Bundle;

import android.os.Environment;

import android.app.Activity;

import android.content.pm.ActivityInfo;

import android.graphics.PixelFormat;

import android.hardware.Camera;

import android.hardware.Camera.CameraInfo;

import android.hardware.Camera.PictureCallback;

import android.hardware.Camera.ShutterCallback;

import android.hardware.Camera.Size;

import android.media.CamcorderProfile;

import android.media.MediaRecorder;

import android.media.CameraProfile;

import android.util.DisplayMetrics;

import android.util.Log;

import android.view.View;

import android.view.Window;

import android.view.Menu;

import android.view.Surface;

import android.view.SurfaceHolder;

import android.view.WindowManager;

import android.view.SurfaceHolder.Callback;

import android.view.SurfaceView;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

publicclass MainActivity extends Activity implements SurfaceHolder.Callback{//

    publicstaticfinalintMEDIA_TYPE_IMAGE = 1;

    publicstaticfinalintMEDIA_TYPE_VIDEO = 2;

      private Camera mCamera01;

      private Button mButton01, mButton02, mButton03;//, mButton04

      private SurfaceView mSurfaceView01;

      private SurfaceHolder mSurfaceHolder01;   

      privatebooleanbIfPreview = false;   

      privatebooleanrecord_stop = true;

      private MediaRecorder mRecorder01;

    @Override

    protectedvoid onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       //设置窗口模式标题、全屏等性质

       requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏 

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 

                WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);// 设置全屏   .FLAG_FULLSCREEN

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 

        getWindow().setFormat(PixelFormat.JPEG);

       setContentView(R.layout.activity_main);      

       init_msys();// 初始化各种控件、参数 

    }

    privatevoid init_msys() {

        mButton01 = (Button)findViewById(R.id.button1);// START/STOP

        mButton02 = (Button)findViewById(R.id.button2);//FINISH

        mButton03 = (Button)findViewById(R.id.button3);//transmit

        //设定按钮监听函数

        mButton01.setOnClickListener(new myButtonClickListener());

        mButton02.setOnClickListener(new myButtonClickListener());

       mButton03.setEnabled(false);

        mSurfaceView01 = (SurfaceView) findViewById(R.id.surfaceView1);   

        mSurfaceHolder01 = mSurfaceView01.getHolder();// 获取 holder

        mSurfaceHolder01.addCallback(this);  //加入回调接口 

        mSurfaceHolder01.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    }

    class myButtonClickListener implements OnClickListener{

       @Override

       publicvoid onClick(View v) {

           // TODO Auto-generated method stub

           //开始和停止  录像按钮

           if(v == mButton01)

           {

              if(record_stop){

              init_camera();             

              mButton01.setText("停止");

              record_stop=false;

              }else

              {

              stop_camera();

              mButton01.setText("开始");

              record_stop=true;

              }     

           }

           //按结束按钮，退出摄像机

           if(v== mButton02){

              finish();

              }     

           }

    }

    privatevoid init_camera()

      {if(!bIfPreview)

           {

        //  mCamera01 = Camera.open();

        if(mCamera01 == null)

            Toast.makeText(MainActivity.this, "没有打开摄像头", Toast.LENGTH_SHORT).show();

        else

            Toast.makeText(MainActivity.this, "打开了摄像头", Toast.LENGTH_SHORT).show();

       Camera.Parameters params = mCamera01.getParameters();

       List<Size> sizes = params.getSupportedPictureSizes();          

       for (Size size : sizes) {

           Toast.makeText(MainActivity.this, "\r\n w:"+size.width+";h:"+size.height, Toast.LENGTH_SHORT).show();

           //et.append("\r\n w:"+size.width+";h:"+size.height);

       }

          mCamera01.stopPreview();

         mCamera01.unlock();

         mRecorder01 = new MediaRecorder();// 创建mRecorder对象 

         mRecorder01.setCamera(mCamera01);// 设置录制视频源为Camera(相机)          

         mRecorder01.setVideoSource(MediaRecorder.VideoSource.CAMERA); //.DEFAULT

         mRecorder01.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);//MediaRecorder.AudioSource.MIC

         mRecorder01.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));         

         // 设置录制完成后视频的封装格式THREE_GPP为3gp.MPEG_4为mp4 

        // mediarecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 

         // 设置录制的视频编码h263 h264 

         //mediarecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

         //mediarecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

         // 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 

         //mediarecorder.setVideoSize(352, 288); 

         // 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 

         //mediarecorder.setVideoFrameRate(15);       

         mRecorder01.setPreviewDisplay(mSurfaceHolder01.getSurface());

         mRecorder01.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());

         try { 

             // 准备录制 

             mRecorder01.prepare(); 

             // 开始录制 

             mRecorder01.start(); 

         } catch (IllegalStateException e) { 

             // TODO Auto-generated catch block 

             e.printStackTrace(); 

         } catch (IOException e) { 

             // TODO Auto-generated catch block 

             e.printStackTrace(); 

         }

        bIfPreview = true;     

         }

       }

    privatestatic File getOutputMediaFile(int type){      

        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(

                  Environment.DIRECTORY_DCIM), "mypictures");

        if (! mediaStorageDir.exists()){

            if (! mediaStorageDir.mkdirs()){

                Log.d("mypictures", "failed to create directory");

                returnnull;

            }

        }

        // Create a media file name

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());

        File mediaFile;

        if (type == MEDIA_TYPE_IMAGE){

            mediaFile = new File(mediaStorageDir.getPath() + File.separator +

            "IMG_"+ timeStamp + ".jpg");

        } elseif(type == MEDIA_TYPE_VIDEO) {

            mediaFile = new File(mediaStorageDir.getPath() + File.separator +

            "VID_"+ timeStamp + ".mp4");

        } else {

            returnnull;

        }

        return mediaFile;

    }

    privatevoid stop_camera(){       

       bIfPreview = false;

       if (mRecorder01 != null){

           mRecorder01.stop();

           mRecorder01.reset();

           mRecorder01.release();

           mRecorder01 = null;

           mCamera01.lock();

       }

       }

    @Override

    publicboolean onCreateOptionsMenu(Menu menu) {

       // Inflate the menu; this adds items to the action bar if it is present.

       getMenuInflater().inflate(R.menu.main, menu);

       returntrue;

    }

    @Override

    publicvoid surfaceChanged(SurfaceHolder holder, int format, int width,

           int height) {

       // TODO Auto-generated method stub

    }

    @Override

    publicvoid surfaceCreated(SurfaceHolder holder) {

       // TODO Auto-generated method stub    

        mSurfaceHolder01 = holder;

        if(null == mCamera01)

        mCamera01 = Camera.open();     

    }

    @Override

    publicvoid surfaceDestroyed(SurfaceHolder holder) {

       // TODO Auto-generated method stub

       stop_camera();

       mCamera01.stopPreview();

       mCamera01.release();

       mCamera01 = null;

       // mCamera01.release();

    }

}

<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <SurfaceView

        android:id="@+id/surfaceView1"

        android:layout_width="301dp"

        android:layout_height="250dp"

        android:layout_gravity="center_horizontal" />

    <RelativeLayout

        android:layout_width="300dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:gravity="center_horizontal" >

        <Button

            android:id="@+id/button1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentTop="true"

            android:text="录像" />

        <Button

            android:id="@+id/button3"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentTop="true"

            android:layout_toRightOf="@+id/button1"

            android:text="连接" />

        <Button

            android:id="@+id/button4"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentTop="true"

            android:layout_toRightOf="@+id/button3"

            android:text="远程" />

        <Button

            android:id="@+id/button2"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentTop="true"

            android:layout_toRightOf="@+id/button4"

            android:text="退出" />

    </RelativeLayout>

</LinearLayout>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.cameraapi"

    android:versionCode="1"

    android:versionName="1.0" >

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.cameraapi.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

    <uses-permission android:name="android.permission.WRITE_SETTINGS"></uses-permission>

    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"></uses-permission>

    <uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>

    <uses-permission android:name="android.permission.CAMERA" />

    <uses-feature android:name="android.hardware.camera" />

    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />

 </manifest>