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。
