Android之使用摄像头拍照

来源：互联网发布：hadoop存入数据编辑：程序博客网时间：2024/04/28 07:26

转载自：http://blog.csdn.net/kesenhoo

直接使用代码演示：

【0】Manifest文件

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<?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

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<?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

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/** 
 * 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());  
            }  
        }  
    }      
}  