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mainActivity如下:

package c.c;import java.io.IOException;import java.util.Iterator;import java.util.List;import android.app.Activity;import android.content.ContentResolver;import android.content.pm.ActivityInfo;import android.content.res.Configuration;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.graphics.PixelFormat;import android.hardware.Camera;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.os.Bundle;import android.provider.MediaStore;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.widget.RelativeLayout;/** *需求描述： *利用SurfaceView预览,且拍照. *将拍摄后的图片保存至相册 * *注意 *1 权限 *  
    *2 屏幕旋转后SurfaceView中预览的图片有90度的旋转 *  解决方式: *  2.1将屏幕设置为竖屏 *  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); *  2.2设置相机的Orientation *  mCamera.setDisplayOrientation(90); *  注意: *  该问题虽然解决了,但是会带来以下的一个问题. *3 拍照保存的图片可能被旋转90度. *  解决方式: *  http://blog.csdn.net/walker02/article/details/8211628 *  http://www.cnblogs.com/andgoo/archive/2012/08/29/2661896.html *   *  此Demo中如下解决该问题 *   *  关于以上问题解决的说明: *  1 相机拍照默认的是横屏的 *     以ME525+为例,默认的是LOGO在左边 *     平常的竖屏LOGO在上边.所以,需要将相机旋转90度. *     即mCamera.setDisplayOrientation(90); *     这样才能在横竖屏切换后预览画面正常显示. *  2  最好不要在代码中设置Activity以什么方式(横/竖屏)显示,比如: *     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); *     应该写在配置文件中,这样效率更高. *  3  现在已经把Activity设置为竖屏了.所以onConfigurationChanged() *     方法已经不能起到期望的作用. *     但是还需要监听现在屏幕是横屏还是竖屏.所以在此采用了重力感应的 *     方式来实现.应该还有其他更好的办法,待调查. *  4 小bug:LOGO朝右边的时候,拍出的照片仍然被旋转了 */public class MainActivity extends Activity implements SurfaceHolder.Callback,OnClickListener,Camera.PictureCallback{	private SensorManager mSensorManager;	private AccSensorListener mAccSensorListener=null;	private Sensor mSensor;    private SurfaceView mSurfaceView;    private SurfaceHolder mSurfaceHolder;    private Camera mCamera;    private float y=0;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		//设置Activity竖屏显示		setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);		setContentView(R.layout.main);		init();	}	private void init(){		mSensorManager=(SensorManager) getSystemService(SENSOR_SERVICE);		mSensor=mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);		mSensorManager.registerListener		(new AccSensorListener(), mSensor, SensorManager.SENSOR_DELAY_NORMAL);		mAccSensorListener=new AccSensorListener();		mSurfaceView=(SurfaceView) findViewById(R.id.surfaceView);		mSurfaceView.setFocusable(true);		mSurfaceView.setFocusableInTouchMode(true);		mSurfaceView.setClickable(true);		mSurfaceView.setOnClickListener(this);		mSurfaceHolder=mSurfaceView.getHolder();		//设置该SurfaceView是一个"推送"类型的SurfaceView		mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);		mSurfaceHolder.addCallback(this);			}	@Override	protected void onDestroy() {		super.onDestroy();		//取消重力感应		mSensorManager.unregisterListener(mAccSensorListener);	} private class AccSensorListener implements SensorEventListener{	public void onSensorChanged(SensorEvent event) {           //System.out.println("xxxxxx event.values[1]="+event.values[1]);           y=event.values[1];	}	public void onAccuracyChanged(Sensor sensor, int accuracy) {	}	  }	//2 parameters.getSupportedXXX的到相机支持的一些效果或者模式,比如:   //parameters.getSupportedPictureFormats();   //parameters.getSupportedColorEffects();   //parameters.getSupportedFocusModes();   //parameters.getSupportedWhiteBalance();	public void surfaceCreated(SurfaceHolder holder) {		final int LARGEST_WIDTH=200;		final int LARGEST_HEIGHT=200;		int bestWidth=0;		int bestHeight=0;		mCamera=Camera.open();		Camera.Parameters parameters=mCamera.getParameters();				//操作1 为相机设置某种特效		List
   
     colorEffects=parameters.getSupportedColorEffects();		Iterator
    
      iterator1=colorEffects.iterator();		while (iterator1.hasNext()) {			String effect = (String) iterator1.next();			if (effect.equals(Camera.Parameters.EFFECT_SOLARIZE)) {				//若支持过度曝光效果,则设置该效果				//parameters.setColorEffect(Camera.Parameters.EFFECT_SOLARIZE);				break;			}		}		//操作2 改变SurfaceView的大小		List
     
       previewSizes=parameters.getSupportedPreviewSizes();		if (previewSizes.size()>1) {			Iterator
      
        iterator2=previewSizes.iterator();			while (iterator2.hasNext()) {				Camera.Size size = (Camera.Size) iterator2.next();				if (size.width>bestWidth&&size.width<=LARGEST_WIDTH&&					size.height>bestHeight&&size.height<=LARGEST_HEIGHT) {					bestWidth=size.width;					bestHeight=size.height;				}			}			if (bestWidth!=0&&bestHeight!=0) {				parameters.setPreviewSize(bestWidth, bestHeight);				mSurfaceView.setLayoutParams				(new RelativeLayout.LayoutParams(bestWidth, bestHeight));			}		}		//操作3 当屏幕变化时,旋转角度.否则不对		//因为刚开始时竖屏的 		mCamera.setDisplayOrientation(90);				//操作结束		try {			//将摄像头的预览显示设置为mSurfaceHolder			mCamera.setPreviewDisplay(mSurfaceHolder);		} catch (IOException e) {			mCamera.release();		}		//设置输出格式		parameters.setPictureFormat(PixelFormat.JPEG);		//设置摄像头的参数.否则前面的设置无效		mCamera.setParameters(parameters);		//摄像头开始预览		mCamera.startPreview();	}	public void surfaceChanged(SurfaceHolder holder, int format, int width,			int height) {		mCamera.startPreview();			}	public void surfaceDestroyed(SurfaceHolder holder) {		mCamera.stopPreview();		mCamera.release();	}	//处理SurfaceView的点击事件	public void onClick(View v) {       mCamera.takePicture(null, null, this);	}	public void onPictureTaken(byte[] data, Camera camera) {	   //将图片保存至相册       if (y>0) {    	   System.out.println("竖屏  竖屏  竖屏  竖屏  竖屏  竖屏  ");    	   ContentResolver resolver = getContentResolver();    	   Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);    	   Matrix matrix=new Matrix();    	   matrix.setRotate(90);    	   Bitmap bitmap2=Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);           MediaStore.Images.Media.insertImage(resolver, bitmap2, "xxoo", "des");	}else {		System.out.println("横屏 横屏 横屏 横屏 横屏 横屏 ");		ContentResolver resolver = getContentResolver();		Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);	    MediaStore.Images.Media.insertImage(resolver, bitmap, "xxoo", "des");	}       //mSensorManager.unregisterListener(mAccSensorListener);	   //拍照后重新开始预览	   camera.startPreview();	}}
      
     
    
   

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