Android编程实现拍照功能的2种方法分析

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

final int TAKE_PICTURE = 1;
//为了表示返回方法中辨识你的程序打开的相机

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (requestCode == TAKE_PICTURE) {
   if (resultCode == RESULT_OK) {
    Bitmap bm = (Bitmap) data.getExtras().get("data");
    img.setImageBitmap(bm);//想图像显示在ImageView视图上，private ImageView img;
    File myCaptureFile = new File("sdcard/123456.jpg");
    try {
      BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
      /* 采用压缩转档方法 */
       bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
       /* 调用flush()方法，更新BufferStream */
       bos.flush();
       /* 结束OutputStream */
       bos.close();
     } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
   }
  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
>
<LinearLayout
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:paddingLeft="130px"
  android:paddingRight="200px"
 >
 <SurfaceView
  android:id="@+id/mSurfaceView1"
  android:visibility="visible"
  android:layout_width="320px"
  android:layout_height="240px">
 </SurfaceView>
 </LinearLayout>
 </LinearLayout>

requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.lay);
/* 取得屏幕解析像素 */
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
// mImageView01 = (ImageView) findViewById(R.id.myImageView1);
/* 以SurfaceView作为相机Preview之用 */
mSurfaceView01 = (SurfaceView) findViewById(R.id.mSurfaceView1);
/* 绑定SurfaceView，取得SurfaceHolder对象 */
mSurfaceHolder01 = mSurfaceView01.getHolder();
/* Activity必须实现SurfaceHolder.Callback */
mSurfaceHolder01.addCallback(takephoto.this);
/*
* 以SURFACE_TYPE_PUSH_BUFFERS(3)
* 作为SurfaceHolder显示类型
* */
mSurfaceHolder01.setType
(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

private Camera mCamera01;
mCamera01 = Camera.open();
/* 创建Camera.Parameters对象 */
Camera.Parameters parameters = mCamera01.getParameters();
/* 设置相片格式为JPEG */
parameters.setPictureFormat(PixelFormat.JPEG);
Log.i(TAG, "pic is jpeg");
/* 指定preview的屏幕大小 */
parameters.setPreviewSize(320, 240);
Log.i(TAG, "pic pingmu fenbianlv");
/* 设置图片分辨率大小 */
parameters.setPictureSize(1024, 768);
Log.i(TAG, "pic tupian fenbianlv");
/* 将Camera.Parameters设置予Camera */
mCamera01.setParameters(parameters);
/* setPreviewDisplay唯一的参数为SurfaceHolder */
mCamera01.setPreviewDisplay(mSurfaceHolder01);
/* 立即运行Preview */
mCamera01.startPreview();

private PictureCallback jpegCallback = new PictureCallback()
{
   public void onPictureTaken(byte[] _data, Camera _camera)
   {
    // TODO Handle JPEG image data
    /* onPictureTaken传入的第一个参数即为相片的byte */
    Bitmap bm = BitmapFactory.decodeByteArray
          (_data, 0, _data.length);
    /* 创建新文件 */
       picname = "sdcard/1234566.jpg";//要保存在哪里，路径你自己设
    File myCaptureFile = new File(picname);
    try
    {
     BufferedOutputStream bos = new BufferedOutputStream
     (new FileOutputStream(myCaptureFile));
     /* 采用压缩转档方法 */
     bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
     /* 调用flush()方法，更新BufferStream */
     bos.flush();
     /* 结束OutputStream */
     bos.close();
     /* 将拍照下来且存储完毕的图文件，显示出来 */
     //mImageView01.setImageBitmap(bm);
     /* 显示完图文件，立即重置相机，并关闭预览 */
     resetCamera();
     }
    catch (Exception e)
    {
     Log.e(TAG, e.getMessage());
    }
   }
};

/* 相机重置 */
private void resetCamera()
{
   if (mCamera01 != null && bIfPreview)
   {
    mCamera01.stopPreview();
    /* 扩展学习，释放Camera对象 */
    mCamera01.release();
    mCamera01 = null;
    bIfPreview = false;
   }
}