Camera学习，实现简单的相机App得到demo

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mycamera"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
	<uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.mycamera.MainActivity"
            android:label="@string/app_name" 
            android:screenOrientation="landscape"
             >
            
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<LinearLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
    	xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        tools:context="com.example.mycamera.MainActivity$PlaceholderFragment"
         >
    <SurfaceView
        android:layout_weight="100"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
       	android:id="@+id/camera"
		 />
    <RelativeLayout 
        
        android:layout_weight="0"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        >
	<Button 
	    android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="拍照"
        android:layout_alignParentRight="true"
        android:id="@+id/pz"
        android:onClick="paizhao"
	    />
	<Button 
	    android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="对焦"
        android:id="@+id/dj"
        android:layout_toLeftOf="@+id/pz"
        android:onClick="duijiao"
	    />
	</RelativeLayout>
	</LinearLayout>

public class MainActivity extends ActionBarActivity {//ActionBarActivity

	private SurfaceView sv;
	private SurfaceHolder holder;
	private Camera mCamera;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//去掉信息栏
        setContentView(R.layout.activity_main);
        sv=(SurfaceView) findViewById(R.id.camera);
        holder=sv.getHolder();
        holder.addCallback(new MyCallback());
    }
    
    public void duijiao(View v)
    {
    	//自动对焦
    	mCamera.autoFocus(null);
    	
    }
    public void paizhao(View v) throws IOException
    {
    	//拍照
    	mCamera.takePicture(null, null, new MyPictureCallback() );
    }

    class MyPictureCallback implements  PictureCallback
    {
		@Override
		public void onPictureTaken(byte[] data, Camera camera) {
			//dada就是拍照后压缩的数据
			File image=new File(Environment.getDataDirectory(),"zp.jpg");
			FileOutputStream out=null;
			try {
				 out=new FileOutputStream(image);
				out.write(data);
				out.flush();
				out.close();
			} catch (Exception e) {
				e.printStackTrace();
				Toast.makeText(MainActivity.this, "保存照片失败！", Toast.LENGTH_LONG).show();
			}
			finally
			{
				mCamera.startPreview();
			}
		}
    	
    }
    
    
class MyCallback implements Callback
{

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		//初始化相机
		mCamera=Camera.open();	
		MainActivity.this.holder=holder;
		//获取相机支持的所有参数
		 //获取相机支持的所有参数，这里获取的相机信息都打在一起，可以复制到word里面，点击crlt+h将所有的";
		//"替换成换行符，点进”替换为“后，在替换界面点击“更多”,然后点击"特殊格式"，选择“手动换行符”，这样
		//可以将所有参数信息一行行显示，具体方法可以参见我的另外一篇博客：http://www.cnblogs.com/bokeofzp/p/4743108.html
//		System.out.println(mCamera.getParameters().flatten());
		
		//得到相机参数后，根据相机支持的参数来设置自定义相机的参数
		Camera.Parameters parms=mCamera.getParameters();
		parms.setPictureFormat(ImageFormat.JPEG);//设置图片的格式
		
		try {
			mCamera.setPreviewDisplay(holder);
		} catch (IOException e) {
			e.printStackTrace();
		}
		mCamera.startPreview();
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		mCamera.release();
		mCamera=null;
	}
	
}
}