利用SurfaceView预览,拍照且保存至相册
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 * <uses-permission android:name="android.permission.CAMERA"/> *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;@Overrideprotected 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SurfaceViewmSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);mSurfaceHolder.addCallback(this);}@Overrideprotected 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<String> colorEffects=parameters.getSupportedColorEffects();Iterator<String> 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<Camera.Size> previewSizes=parameters.getSupportedPreviewSizes();if (previewSizes.size()>1) {Iterator<Camera.Size> 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mSurfaceHoldermCamera.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();}}
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <SurfaceView android:id="@+id/surfaceView" android:layout_width="fill_parent" android:layout_height="fill_parent" /></RelativeLayout>