<b>Android Camera——拍照</b>
Camera定义在package android.hardware内,具体用法SDK里叙述的可清楚了。架构解析什么的网上也有很多,没什么必要讲了(你认为我不知道我会说吗)。
这篇呢,就整理了下Camera的拍照,其他还木有==
<b>一、系统相机</b>
<b> </b><b>1)调用方式</b>
系统相机的入口Action:MediaStore.ACTION_IMAGE_CAPTURE。只需以startActivityForResult(…)启动该Activity即可。
// 调用系统相机
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 1);
<b> 2</b><b>)处理方式</b>
在onActivityResult(…)中,处理返回信息。
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (1 == requestCode) { // 系统相机返回处理
if (resultCode == Activity.RESULT_OK) {
Bitmap cameraBitmap = (Bitmap) data.getExtras().get("data");
…… // 处理图像
}
takeBtn1.setClickable(true);
}
super.onActivityResult(requestCode, resultCode, data);
}
<b>二、自定义相机</b>
<b> 1</b><b>)照相预览</b>
继承SufaceView写自己的预览界面,继而放到你的照相Activity的布局里。这里面有个相机拍照监听接口,用于在Activity里再处理这些操作。<b></b>
public class CameraPreview extends SurfaceView implements
SurfaceHolder.Callback {
/** LOG标识 */
// private static final String TAG = "CameraPreview";
/** 分辨率 */
public static final int WIDTH = 1024;
public static final int HEIGHT = 768;
/** 监听接口 */
private OnCameraStatusListener listener;
private SurfaceHolder holder;
private Camera camera;
// 创建一个PictureCallback对象,并实现其中的onPictureTaken方法
private PictureCallback pictureCallback = new PictureCallback() {
// 该方法用于处理拍摄后的照片数据
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// 停止照片拍摄
camera.stopPreview();
camera = null;
// 调用结束事件
if (null != listener) {
listener.onCameraStopped(data);
}
};
// Preview类的构造方法
public CameraPreview(Context context, AttributeSet attrs) {
super(context, attrs);
// 获得SurfaceHolder对象
holder = getHolder();
// 指定用于捕捉拍照事件的SurfaceHolder.Callback对象
holder.addCallback(this);
// 设置SurfaceHolder对象的类型
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
// 在surface创建时激发
public void surfaceCreated(SurfaceHolder holder) {
// Log.e(TAG, "==surfaceCreated==");
// 获得Camera对象
camera = Camera.open();
try {
// 设置用于显示拍照摄像的SurfaceHolder对象
camera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
// 释放手机摄像头
camera.release();
// 在surface销毁时激发
public void surfaceDestroyed(SurfaceHolder holder) {
// Log.e(TAG, "==surfaceDestroyed==");
// 释放手机摄像头
camera.release();
// 在surface的大小发生改变时激发
public void surfaceChanged(final SurfaceHolder holder, int format, int w,
int h) {
// Log.e(TAG, "==surfaceChanged==");
// 获取照相机参数
Camera.Parameters parameters = camera.getParameters();
// 设置照片格式
parameters.setPictureFormat(PixelFormat.JPEG);
// 设置预浏尺寸
parameters.setPreviewSize(WIDTH, HEIGHT);
// 设置照片分辨率
parameters.setPictureSize(WIDTH, HEIGHT);
// 设置照相机参数
camera.setParameters(parameters);
// 开始拍照
camera.startPreview();
} catch (Exception e) {
// 停止拍照,并将拍摄的照片传入PictureCallback接口的onPictureTaken方法
public void takePicture() {
// Log.e(TAG, "==takePicture==");
if (camera != null) {
// 自动对焦
camera.autoFocus(new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (null != listener) {
listener.onAutoFocus(success);
}
// 自动对焦成功后才拍摄
if (success) {
camera.takePicture(null, null, pictureCallback);
}
});
// 设置监听事件
public void setOnCameraStatusListener(OnCameraStatusListener listener) {
this.listener = listener;
/**
* 相机拍照监听接口
*/
public interface OnCameraStatusListener {
// 相机拍照结束事件
void onCameraStopped(byte[] data);
// 拍摄时自动对焦事件
void onAutoFocus(boolean success);
<b> 2</b><b>)照相活动</b>
就是我们自己做的照相Activity了。完成后调用自己的相机,也就是跳转入这个Activity。这里面,照片以自定义路径的形式存入的媒体库。<b></b>
public class CameraActivity extends Activity implements
CameraPreview.OnCameraStatusListener {
public static final Uri IMAGE_URI = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
public static final String PATH = Environment.getExternalStorageDirectory()
.toString() + "/AndroidMedia/";
private CameraPreview mCameraPreview;
private ImageView focusView;
private boolean isTaking = false; // 拍照中
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置横屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
// 设置全屏
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// 设置布局视图
setContentView(R.layout.camera);
// 照相预览界面
mCameraPreview = (CameraPreview) findViewById(R.id.preview);
mCameraPreview.setOnCameraStatusListener(this);
// 焦点图片
focusView = (ImageView) findViewById(R.id.focusView);
* 触屏事件
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN && !isTaking) {
isTaking = true;
mCameraPreview.takePicture();
return super.onTouchEvent(event);
* 存储图像并将信息添加入媒体数据库
private Uri insertImage(ContentResolver cr, String name, long dateTaken,
String directory, String filename, Bitmap source, byte[] jpegData) {
OutputStream outputStream = null;
String filePath = directory + filename;
File dir = new File(directory);
if (!dir.exists()) {
dir.mkdirs();
File file = new File(directory, filename);
if (file.createNewFile()) {
outputStream = new FileOutputStream(file);
if (source != null) {
source.compress(CompressFormat.JPEG, 75, outputStream);
} else {
outputStream.write(jpegData);
} catch (FileNotFoundException e) {
return null;
} finally {
if (outputStream != null) {
try {
outputStream.close();
} catch (Throwable t) {
ContentValues values = new ContentValues(7);
values.put(MediaStore.Images.Media.TITLE, name);
values.put(MediaStore.Images.Media.DISPLAY_NAME, filename);
values.put(MediaStore.Images.Media.DATE_TAKEN, dateTaken);
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
values.put(MediaStore.Images.Media.DATA, filePath);
return cr.insert(IMAGE_URI, values);
* 相机拍照结束事件
public void onCameraStopped(byte[] data) {
Log.e("onCameraStopped", "==onCameraStopped==");
// 创建图像
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
// 系统时间
long dateTaken = System.currentTimeMillis();
// 图像名称
String filename = DateFormat.format("yyyy-MM-dd kk.mm.ss", dateTaken)
.toString() + ".jpg";
// 存储图像(PATH目录)
Uri uri = insertImage(getContentResolver(), filename, dateTaken, PATH,
filename, bitmap, data);
// 返回结果
Intent intent = getIntent();
intent.putExtra("uriStr", uri.toString());
intent.putExtra("dateTaken", dateTaken);
// intent.putExtra("filePath", PATH + filename);
// intent.putExtra("orientation", orientation); // 拍摄方向
setResult(20, intent);
// 关闭当前Activity
finish();
* 拍摄时自动对焦事件
public void onAutoFocus(boolean success) {
// 改变对焦状态图像
if (success) {
focusView.setImageResource(R.drawable.focus2);
} else {
focusView.setImageResource(R.drawable.focus1);
Toast.makeText(this, "焦距不准,请重拍!", Toast.LENGTH_SHORT).show();
isTaking = false;
<b>3</b><b>)相机调用&</b><b>处理</b>
// 调用自定义相机
Intent intent = new Intent(this, CameraActivity.class);
startActivityForResult(intent, 2);
if (2 == requestCode) { // 自定义相机返回处理
// 拍照成功后,响应码是20
if (resultCode == 20) {
Bundle bundle = data.getExtras();
// 获得照片uri
Uri uri = Uri.parse(bundle.getString("uriStr"));
// 获得拍照时间
long dateTaken = bundle.getLong("dateTaken");
try {
// 从媒体数据库获取该照片
Bitmap cameraBitmap = MediaStore.Images.Media.getBitmap(
getContentResolver(), uri);
previewBitmap(cameraBitmap); // 预览图像
// 从媒体数据库删除该照片(按拍照时间)
getContentResolver().delete(
CameraActivity.IMAGE_URI,
MediaStore.Images.Media.DATE_TAKEN + "="
+ String.valueOf(dateTaken), null);
} catch (Exception e) {
e.printStackTrace();
takeBtn2.setClickable(true);
<b>三、我加的相机蒙版</b><b>^^</b>
这个最重要了,就是为了这个才把这还未完工的工程放上来的。
布局文件里面我们在加一个自定义的MaskSurfaceView,注意放在相机预览的前面,并要设置成透明(包括重刷图层的时候也要注意透明度)。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="horizontal" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" >
<org.join.meida.camera.takephoto.MaskSurfaceView
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<org.join.meida.camera.takephoto.CameraPreview
android:id="@+id/preview"
<ImageView
android:id="@+id/focusView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="@drawable/focus1" />
</RelativeLayout>
</LinearLayout>
蒙版来啦,注意到心了没有?(3d爱心是网上别人实现的)<b></b>
public class MaskSurfaceView extends SurfaceView implements
SurfaceHolder.Callback, Runnable {
// 定义SurfaceHolder对象
private SurfaceHolder mSurfaceHolder;
// 循环标记
private boolean loop = true;
// 循环间隔
private static final long TIME = 300;
// 计数器
private int mCount;
// 绘制方式
private int mode;
public MaskSurfaceView(Context context, AttributeSet attrs) {
mSurfaceHolder = getHolder(); // 获取SurfaceHolder
mSurfaceHolder.addCallback(this); // 添加回调
mSurfaceHolder.setFormat(PixelFormat.TRANSLUCENT); // 设置透明
mode = new Random().nextInt(2); // 随机一个[0-2)数
new Thread(this).start(); // 开始绘制
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
loop = false;
public void run() {
while (loop) {
Thread.sleep(TIME);
} catch (InterruptedException e) {
synchronized (mSurfaceHolder) {
drawMask();
* 绘制蒙版
private void drawMask() {
// 锁定画布,得到canvas
Canvas mCanvas = mSurfaceHolder.lockCanvas();
// 避免surface销毁后,线程唤醒仍进入绘制
if (mSurfaceHolder == null || mCanvas == null)
return;
int w = mCanvas.getWidth();
int h = mCanvas.getHeight();
/* 创建一个画笔 */
Paint mPaint = new Paint();
mPaint.setAntiAlias(true); // 设置抗锯齿
mPaint.setColor(0x00000000); // 设置透明黑色
mCanvas.drawRect(0, 0, w, h, mPaint); // 重绘背景
setPaintColor(mPaint); // 循环设置画笔颜色
mPaint.setStyle(Paint.Style.STROKE); // 描边
if (0 == mode) {
drawHeart2D(mCanvas, mPaint, w / 2, h / 2, h / 2); // 画一个2d爱心
drawHeart3D(mCanvas, mPaint); // 画一个3d爱心
// 绘制后解锁,绘制后必须解锁才能显示
mSurfaceHolder.unlockCanvasAndPost(mCanvas);
/** 画一个2d爱心(半圆+sin曲线) */
private void drawHeart2D(Canvas mCanvas, Paint mPaint, int centerX,
int centerY, float height) {
float r = height / 4;
/* 心两半圆结点处 */
float topX = centerX;
float topY = centerY - r;
/* 左上半圆 */
RectF leftOval = new RectF(topX - 2 * r, topY - r, topX, topY + r);
mCanvas.drawArc(leftOval, 180f, 180f, false, mPaint);
/* 右上半圆 */
RectF rightOval = new RectF(topX, topY - r, topX + 2 * r, topY + r);
mCanvas.drawArc(rightOval, 180f, 180f, false, mPaint);
/* 下半两sin曲线 */
float base = 3 * r;
double argu = Math.PI / 2 / base;
float y = base, value;
while (y >= 0) {
value = (float) (2 * r * Math.sin(argu * (base - y)));
mCanvas.drawPoint(topX - value, topY + y, mPaint);
mCanvas.drawPoint(topX + value, topY + y, mPaint);
y -= 1;
// 1)心形函数:x²+(y-³√x²)²=1
// >> x^2+(y-(x^2)^(1/3))^2=1
//
// 2)心形的各种画法:
// >> http://woshao.com/article/1a855728bda511e0b40e000c29fa3b3a/
// 3)笛卡尔情书的秘密——心形函数的绘制
// >> http://www.cssass.com/blog/index.php/2010/808.html
/** 画一个3d爱心 */
private void drawHeart3D(Canvas mCanvas, Paint mPaint) {
/* 画一个3d爱心 */
int i, j;
double x, y, r;
for (i = 0; i <= 90; i++) {
for (j = 0; j <= 90; j++) {
r = Math.PI / 45 * i * (1 - Math.sin(Math.PI / 45 * j)) * 20;
x = r * Math.cos(Math.PI / 45 * j) * Math.sin(Math.PI / 45 * i)
+ w / 2;
y = -r * Math.sin(Math.PI / 45 * j) + h / 4;
mCanvas.drawPoint((float) x, (float) y, mPaint);
/** 循环设置画笔颜色 */
private void setPaintColor(Paint mPaint) {
mCount = mCount < 100 ? mCount + 1 : 0;
switch (mCount % 6) {
case 0:
mPaint.setColor(Color.BLUE);
break;
case 1:
mPaint.setColor(Color.GREEN);
case 2:
mPaint.setColor(Color.RED);
case 3:
mPaint.setColor(Color.YELLOW);
case 4:
mPaint.setColor(Color.argb(255, 255, 181, 216));
case 5:
mPaint.setColor(Color.argb(255, 0, 255, 255));
default:
mPaint.setColor(Color.WHITE);
<b>四、后记</b>
今天是几号来着?T^T。
<a href="http://down.51cto.com/data/2359820" target="_blank">附件:http://down.51cto.com/data/2359820</a>
本文转自winorlose2000 51CTO博客,原文链接:http://blog.51cto.com/vaero/779942,如需转载请自行联系原作者