Android編程實(shí)現(xiàn)拍照功能的2種方法分析

<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;
//為了表示返回方法中辨識你的程序打開的相機(jī)

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);//想圖像顯示在ImageView視圖上，private ImageView img;
    File myCaptureFile = new File("sdcard/123456.jpg");
    try {
      BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
      /* 采用壓縮轉(zhuǎn)檔方法 */
       bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
       /* 調(diào)用flush()方法，更新BufferStream */
       bos.flush();
       /* 結(jié)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作為相機(jī)Preview之用 */
mSurfaceView01 = (SurfaceView) findViewById(R.id.mSurfaceView1);
/* 綁定SurfaceView，取得SurfaceHolder對象 */
mSurfaceHolder01 = mSurfaceView01.getHolder();
/* Activity必須實(shí)現(xiàn)SurfaceHolder.Callback */
mSurfaceHolder01.addCallback(takephoto.this);
/*
* 以SURFACE_TYPE_PUSH_BUFFERS(3)
* 作為SurfaceHolder顯示類型
* */
mSurfaceHolder01.setType
(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

private Camera mCamera01;
mCamera01 = Camera.open();
/* 創(chuàng)建Camera.Parameters對象 */
Camera.Parameters parameters = mCamera01.getParameters();
/* 設(shè)置相片格式為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");
/* 設(shè)置圖片分辨率大小 */
parameters.setPictureSize(1024, 768);
Log.i(TAG, "pic tupian fenbianlv");
/* 將Camera.Parameters設(shè)置予Camera */
mCamera01.setParameters(parameters);
/* setPreviewDisplay唯一的參數(shù)為SurfaceHolder */
mCamera01.setPreviewDisplay(mSurfaceHolder01);
/* 立即運(yùn)行Preview */
mCamera01.startPreview();

private PictureCallback jpegCallback = new PictureCallback()
{
   public void onPictureTaken(byte[] _data, Camera _camera)
   {
    // TODO Handle JPEG image data
    /* onPictureTaken傳入的第一個參數(shù)即為相片的byte */
    Bitmap bm = BitmapFactory.decodeByteArray
          (_data, 0, _data.length);
    /* 創(chuàng)建新文件 */
       picname = "sdcard/1234566.jpg";//要保存在哪里，路徑你自己設(shè)
    File myCaptureFile = new File(picname);
    try
    {
     BufferedOutputStream bos = new BufferedOutputStream
     (new FileOutputStream(myCaptureFile));
     /* 采用壓縮轉(zhuǎn)檔方法 */
     bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
     /* 調(diào)用flush()方法，更新BufferStream */
     bos.flush();
     /* 結(jié)束OutputStream */
     bos.close();
     /* 將拍照下來且存儲完畢的圖文件，顯示出來 */
     //mImageView01.setImageBitmap(bm);
     /* 顯示完圖文件，立即重置相機(jī)，并關(guān)閉預(yù)覽 */
     resetCamera();
     }
    catch (Exception e)
    {
     Log.e(TAG, e.getMessage());
    }
   }
};

/* 相機(jī)重置 */
private void resetCamera()
{
   if (mCamera01 != null && bIfPreview)
   {
    mCamera01.stopPreview();
    /* 擴(kuò)展學(xué)習(xí)，釋放Camera對象 */
    mCamera01.release();
    mCamera01 = null;
    bIfPreview = false;
   }
}