Android之使用摄像头拍照

直接使用代码演示：

【0】Manifest文件

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.hoo.picture" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name="TakePhotoActivity" android:label="@string/app_name" android:screenOrientation="landscape"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-sdk android:minSdkVersion="7" /> <!-- 访问摄像头的权限 --> <uses-permission android:name="android.permission.CAMERA"/> <!-- 在SDCard中创建与删除文件权限 --> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <!-- 往SDCard写入数据权限 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> </manifest>

【1】为主界面添加SurfaceView控件

<?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" > <SurfaceView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/surfaceView" /> </LinearLayout>

【2】TakePhotoActivity.java

/** * 拍照功能 * @author kay */ public class TakePhotoActivity extends Activity { private static final String TAG = "TakeActivity"; private SurfaceView surfaceView; private Camera camera; private boolean preview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Window window = getWindow(); //设置没有标题 requestWindowFeature(Window.FEATURE_NO_TITLE); //设置全屏 window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); //设置高亮 window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(R.layout.main); surfaceView =(SurfaceView)this.findViewById(R.id.surfaceView); //设置分辨率 surfaceView.getHolder().setFixedSize(176, 144); //设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); surfaceView.getHolder().addCallback(new SurfaceCallback()); } private final class SurfaceCallback implements SurfaceHolder.Callback { //画面变化时 @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } //画面创建时 @Override public void surfaceCreated(SurfaceHolder holder) { try { //打开摄像头 camera = Camera.open(); WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); Display display = wm.getDefaultDisplay(); //构造摄像头参数 Camera.Parameters parameters = camera.getParameters(); //设置预览照片的大小 parameters.setPreviewSize(display.getWidth(), display.getHeight()); //设置每秒3帧 parameters.setPreviewFrameRate(3); //设置照片的输出格式 parameters.setPictureFormat(PixelFormat.JPEG); //设置照片质量 parameters.set("jpeg-quality", 85); //设置照片的大小 parameters.setPictureSize(display.getWidth(), display.getHeight()); //设置摄像头参数 camera.setParameters(parameters); //通过SurfaceView显示取景画面 camera.setPreviewDisplay(surfaceView.getHolder()); //开始预览照片 camera.startPreview(); preview = true; } catch (IOException e) { Log.e(TAG, e.toString()); } } //画面关闭时 @Override public void surfaceDestroyed(SurfaceHolder holder) { if(camera!=null) { if(preview) camera.stopPreview(); camera.release(); } } } //重写手机按钮事件 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(camera!=null && event.getRepeatCount()==0) { switch (keyCode) { case KeyEvent.KEYCODE_SEARCH: camera.autoFocus(null);//自动对焦 break; //按下拍照键或者中间键，则拍照 case KeyEvent.KEYCODE_CAMERA: case KeyEvent.KEYCODE_DPAD_CENTER: //此方法是异步的，不能在后面添加其他数据 camera.takePicture(null, null, new TakePictureCallback()); break; } } return true; } //使用内部类，拍照回调 private final class TakePictureCallback implements PictureCallback { @Override public void onPictureTaken(byte[] data, Camera camera) { try { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis()+".jpg"); FileOutputStream outStream = new FileOutputStream(file); //压缩文件 bitmap.compress(CompressFormat.JPEG, 100, outStream); outStream.close(); //关闭预览 camera.stopPreview(); //重新开始预览 camera.startPreview(); } catch (Exception e) { Log.e(TAG, e.toString()); } } } }