Android开发实现拍照功能的方法实例解析

本文实例讲述了android开发实现拍照功能的方法。分享给大家供大家参考，具体如下：

解析：

1）判断是否有摄像头checkcamerahardware(this)
2）获得相机camera = camera.open(0);
3）把相机添加到mpreview = new surfacepreview(this, mcamera);
4）实现拍照 mcamera.autofocus
5）在拍照后使用mcamera.takepicture(null, null, mpicture);方法把图片保存到sdcard

代码实现:

/**
 * 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;
    }
  }
}

布局：

<?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>

更多关于android相关内容感兴趣的读者可查看本站专题：《android拍照与图片处理技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。