SurfaceView之拍照

SurfaceView只有当activity显示到了前台，该控件才会被创建，因此需要监听SurfaceView的创建。

1   // SurfaceView只有当activity显示到了前台，该控件才会被创建     因此需要监听surfaceview的创建
2   holder.addCallback(new MySurfaceCallback());

在拍照的时候相机是被占用的，拍照之后需要重新开启预览。

具体拍照的demo：

  1 package com.android.hzy.takepicture;
  2 
  3 import java.io.File;
  4 import java.io.FileOutputStream;
  5 import java.io.IOException;
  6 
  7 import android.app.Activity;
  8 import android.hardware.Camera;
  9 import android.hardware.Camera.Parameters;
 10 import android.hardware.Camera.PictureCallback;
 11 import android.os.Bundle;
 12 import android.os.Environment;
 13 import android.util.Log;
 14 import android.view.SurfaceHolder;
 15 import android.view.SurfaceHolder.Callback;
 16 import android.view.SurfaceView;
 17 import android.view.View;
 18 import android.view.Window;
 19 import android.view.WindowManager;
 20 
 21 public class MainActivity extends Activity {
 22     
 23     private SurfaceView surfaceview;
 24     private Camera camera;
 25 
 26     @Override
 27     protected void onCreate(Bundle savedInstanceState) {
 28         super.onCreate(savedInstanceState);
 29         requestWindowFeature(Window.FEATURE_NO_TITLE); // 没有标题  必须在设置布局之前找到调用
 30         setContentView(R.layout.activity_main);
 31         
 32         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, // 设置全屏显示
 33                 WindowManager.LayoutParams.FLAG_FULLSCREEN);
 34         
 35         surfaceview = (SurfaceView) findViewById(R.id.surfaceview);
 36         SurfaceHolder holder = surfaceview.getHolder();
 37         holder.setFixedSize(176, 155);// 设置分辨率 
 38         holder.setKeepScreenOn(true);
 39         holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
 40         
 41         // SurfaceView只有当activity显示到了前台，该控件才会被创建     因此需要监听surfaceview的创建
 42         holder.addCallback(new MySurfaceCallback());
 43         
 44     }
 45     
 46     /**
 47      * 监听surfaceview的创建
 48      * @author Administrator
 49      *    Surfaceview只有当activity显示到前台，该空间才会被创建
 50      */
 51     private final class MySurfaceCallback implements Callback{
 52 
 53         @Override
 54         public void surfaceChanged(SurfaceHolder holder, int format, int width,
 55                 int height) {
 56             // TODO Auto-generated method stub
 57             
 58         }
 59 
 60         @Override
 61         public void surfaceCreated(SurfaceHolder holder) {
 62             // TODO Auto-generated method stub
 63 
 64             try {
 65                 // 当surfaceview创建就去打开相机
 66                 camera = Camera.open();
 67                 Parameters params = camera.getParameters();
 68                 Log.i("i", params.flatten());
 69                 params.setJpegQuality(80);  // 设置照片的质量
 70                 params.setPictureSize(1024, 768);
 71                 params.setPreviewFrameRate(5);  // 预览帧率
 72                 camera.setParameters(params); // 将参数设置给相机
 73                 // 设置预览显示
 74                 camera.setPreviewDisplay(surfaceview.getHolder());
 75                 // 开启预览
 76                 camera.startPreview();
 77             } catch (IOException e) {
 78                 // TODO Auto-generated catch block
 79                 e.printStackTrace();
 80             }
 81             
 82         }
 83 
 84         @Override
 85         public void surfaceDestroyed(SurfaceHolder holder) {
 86             // TODO Auto-generated method stub
 87             if(camera != null){
 88                 camera.release();
 89                 camera = null;
 90             }
 91         }
 92         
 93     }
 94 
 95     public void autofoucs(View v){
 96         // 自动对焦由硬件来完成
 97     }
 98     
 99     public void takepicture(View v){
100         /*
101          * shutter:快门被按下
102          * raw:相机所捕获的原始数据
103          * jpeg:相机处理的数据
104          */
105         camera.takePicture(null, null, new MyPictureCallback());
106     }
107     
108     private final class MyPictureCallback implements PictureCallback{
109 
110         @Override
111         public void onPictureTaken(byte[] data, Camera camera) {
112             // TODO Auto-generated method stub
113             try {
114                 File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg");
115                 FileOutputStream fos = new FileOutputStream(file);
116                 fos.write(data);
117                 // 在拍照的时候相机是被占用的,拍照之后需要重新预览
118                 camera.startPreview();
119             } catch (Exception e) {
120                 // TODO Auto-generated catch block
121                 e.printStackTrace();
122             }
123             
124         }
125         
126     }
127 
128 }