Android开发实现拍照功能的方法实例解析

/** * 使用照相机拍照 * @author chen.lin * */public class CameraActivity extends Activity {  private Camera mCamera;//相机  private SurfacePreView mPreView;//视图  private FrameLayout mFrameLayout;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_camera_takephoto);    mFrameLayout = (FrameLayout) findViewById(R.id.framelayout);    if (checkCameraHardware(this)) {      mCamera = getCamera();      mPreView = new SurfacePreView(this, mCamera);      mFrameLayout.addView(mPreView);    }  }  /**   * 拍照对焦   * @param view   */  public void takephoto(View view){    mCamera.autoFocus(new AutoFocusCallback() {      @Override      public void onAutoFocus(boolean success, Camera camera) {        mCamera.takePicture(null, null, mPicture);      }    });  }  /**   * 拍照后的图片保存   */  private PictureCallback mPicture = new PictureCallback() {    @Override    public void onPictureTaken(byte[] data, Camera camera) {      try {        File file = new File("/sdcard/file/aa.jpg");        if (!file.exists()) {          file.mkdirs();        }        FileOutputStream fos = new FileOutputStream(file);        fos.write(data);        fos.close();      } catch (FileNotFoundException e) {        e.printStackTrace();      } catch (IOException e) {        e.printStackTrace();      }    }  };  /**   * 判断照相机是否存在   * @param context   * @return   */  private boolean checkCameraHardware(Context context){    if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {      return true;    }    return false;   }  /**   * 初始化照相机   * @return   */  public static Camera getCamera(){    Camera camera = null;    try {      camera = Camera.open(0);    } catch (Exception e) {      e.printStackTrace();    }    return camera;  }  /**   * 实现拍照视图   */  @SuppressWarnings("deprecation")  private class SurfacePreView extends SurfaceView implements SurfaceHolder.Callback{    private Camera mCamera;    private SurfaceHolder mHolder;    public SurfacePreView(Context context, Camera camera) {      super(context);      mCamera = camera;      mHolder = getHolder();      mHolder.addCallback(this);      mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    }    @Override    public void surfaceCreated(SurfaceHolder holder) {      try {        mCamera.setPreviewDisplay(mHolder);        mCamera.startPreview();      } catch (IOException e) {        e.printStackTrace();      }    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {      if (holder.getSurface() == null) {        return;      }      try {        mCamera.stopPreview();        mCamera.setPreviewDisplay(mHolder);        mCamera.startPreview();      } catch (IOException e) {        e.printStackTrace();      }    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {      //      mCamera = null;    }  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" >  <FrameLayout    android:id="@+id/framelayout"    android:layout_width="wrap_content"    android:layout_height="0dp"    android:layout_weight="1" >  </FrameLayout>  <Button    android:id="@+id/button1"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:onClick="takephoto"    android:text="拍照" /></LinearLayout>