Android自定义照相机的实例

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   android:id="@+id/FrameLayout1"   android:layout_width="match_parent"   android:layout_height="match_parent" >   <!-- 显示预览图形 -->   <SurfaceView      android:id="@+id/surfaceView"     android:layout_width="match_parent"     android:layout_height="match_parent"     />   <!-- 相对布局，放置两个按钮 -->     <RelativeLayout       android:id="@+id/buttonLayout"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:visibility="gone"     >     <!-- 拍照按钮 -->     <Button        android:id="@+id/takepicture"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentRight="true"       android:layout_alignParentBottom="true"       android:background="@drawable/btn_tabkepicture_selector"       android:onClick="btnOnclick"       />     <ImageView        android:id="@+id/scalePic"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentLeft="true"       android:layout_alignParentBottom="true"       android:layout_marginLeft="5dp"       android:background="@drawable/img_showpic_selector"       android:onClick="imageClick"       />   </RelativeLayout> </FrameLayout> 

<manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="com.wwj.finger"   android:versionCode="1"   android:versionName="1.0" >    <uses-sdk     android:minSdkVersion="4"     android:targetSdkVersion="15" />    <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" /> <application     android:icon="@drawable/ic_launcher"     android:label="@string/app_name"     android:theme="@style/AppTheme" >     <activity       android:name=".MainActivity"       android:label="@string/title_activity_main"        >       <intent-filter>         <action android:name="android.intent.action.MAIN" />          <category android:name="android.intent.category.LAUNCHER" />       </intent-filter>     </activity>     <activity        android:name=".ShowPicActivity"       android:label="@string/app_name"       android:theme="@style/AppTheme"       android:configChanges="orientation|keyboardHidden"       ></activity>   </application>  </manifest> 

package com.wwj.finger;  import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date;   import android.app.Activity; import android.content.Intent; import android.graphics.PixelFormat; import android.hardware.Camera; import android.hardware.Camera.PictureCallback; import android.os.Bundle; import android.os.Environment; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.Surface; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; import android.view.View; import android.view.ViewGroup; import android.widget.Toast;  /**  * Android手指拍照  *  * @author wwj  * @date 2013/4/29  */ public class MainActivity extends Activity {   private View layout;   private Camera camera;   private Camera.Parameters parameters = null;    Bundle bundle = null; // 声明一个Bundle对象，用来存储数据    @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     // 显示界面     setContentView(R.layout.activity_main);      layout = this.findViewById(R.id.buttonLayout);      SurfaceView surfaceView = (SurfaceView) this         .findViewById(R.id.surfaceView);     surfaceView.getHolder()         .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);     surfaceView.getHolder().setFixedSize(176, 144); //设置Surface分辨率     surfaceView.getHolder().setKeepScreenOn(true);// 屏幕常亮     surfaceView.getHolder().addCallback(new SurfaceCallback());//为SurfaceView的句柄添加一个回调函数   }    /**    * 按钮被点击触发的事件    *    * @param v    */   public void btnOnclick(View v) {     if (camera != null) {       switch (v.getId()) {       case R.id.takepicture:         // 拍照         camera.takePicture(null, null, new MyPictureCallback());         break;       }     }   }    /**    * 图片被点击触发的时间    *    * @param v    */   public void imageClick(View v) {     if (v.getId() == R.id.scalePic) {       if (bundle == null) {         Toast.makeText(getApplicationContext(), R.string.takephoto,             Toast.LENGTH_SHORT).show();       } else {         Intent intent = new Intent(this, ShowPicActivity.class);         intent.putExtras(bundle);         startActivity(intent);       }     }   }    private final class MyPictureCallback implements PictureCallback {      @Override     public void onPictureTaken(byte[] data, Camera camera) {       try {         bundle = new Bundle();         bundle.putByteArray("bytes", data); //将图片字节数据保存在bundle当中，实现数据交换         saveToSDCard(data); // 保存图片到sd卡中         Toast.makeText(getApplicationContext(), R.string.success,             Toast.LENGTH_SHORT).show();         camera.startPreview(); // 拍完照后，重新开始预览        } catch (Exception e) {         e.printStackTrace();       }     }   }    /**    * 将拍下来的照片存放在SD卡中    * @param data     * @throws IOException    */   public static void saveToSDCard(byte[] data) throws IOException {     Date date = new Date();     SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); // 格式化时间     String filename = format.format(date) + ".jpg";     File fileFolder = new File(Environment.getExternalStorageDirectory()         + "/finger/");     if (!fileFolder.exists()) { // 如果目录不存在，则创建一个名为"finger"的目录       fileFolder.mkdir();     }     File jpgFile = new File(fileFolder, filename);     FileOutputStream outputStream = new FileOutputStream(jpgFile); // 文件输出流     outputStream.write(data); // 写入sd卡中     outputStream.close(); // 关闭输出流   }     private final class SurfaceCallback implements Callback {      // 拍照状态变化时调用该方法     @Override     public void surfaceChanged(SurfaceHolder holder, int format, int width,         int height) {       parameters = camera.getParameters(); // 获取各项参数       parameters.setPictureFormat(PixelFormat.JPEG); // 设置图片格式       parameters.setPreviewSize(width, height); // 设置预览大小       parameters.setPreviewFrameRate(5); //设置每秒显示4帧       parameters.setPictureSize(width, height); // 设置保存的图片尺寸       parameters.setJpegQuality(80); // 设置照片质量     }      // 开始拍照时调用该方法     @Override     public void surfaceCreated(SurfaceHolder holder) {       try {         camera = Camera.open(); // 打开摄像头         camera.setPreviewDisplay(holder); // 设置用于显示拍照影像的SurfaceHolder对象         camera.setDisplayOrientation(getPreviewDegree(MainActivity.this));         camera.startPreview(); // 开始预览       } catch (Exception e) {         e.printStackTrace();       }      }      // 停止拍照时调用该方法     @Override     public void surfaceDestroyed(SurfaceHolder holder) {       if (camera != null) {         camera.release(); // 释放照相机         camera = null;       }     }   }    /**    * 点击手机屏幕是，显示两个按钮    */   @Override   public boolean onTouchEvent(MotionEvent event) {     switch (event.getAction()) {     case MotionEvent.ACTION_DOWN:       layout.setVisibility(ViewGroup.VISIBLE); // 设置视图可见       break;     }     return true;   }       @Override   public boolean onKeyDown(int keyCode, KeyEvent event) {     switch (keyCode) {     case KeyEvent.KEYCODE_CAMERA: // 按下拍照按钮       if (camera != null && event.getRepeatCount() == 0) {         // 拍照         //注：调用takePicture()方法进行拍照是传入了一个PictureCallback对象――当程序获取了拍照所得的图片数据之后         //，PictureCallback对象将会被回调，该对象可以负责对相片进行保存或传入网络         camera.takePicture(null, null, new MyPictureCallback());       }     }     return super.onKeyDown(keyCode, event);   }    // 提供一个静态方法，用于根据手机方向获得相机预览画面旋转的角度   public static int getPreviewDegree(Activity activity) {     // 获得手机的方向     int rotation = activity.getWindowManager().getDefaultDisplay()         .getRotation();     int degree = 0;     // 根据手机的方向计算相机预览画面应该选择的角度     switch (rotation) {     case Surface.ROTATION_0:       degree = 90;       break;     case Surface.ROTATION_90:       degree = 0;       break;     case Surface.ROTATION_180:       degree = 270;       break;     case Surface.ROTATION_270:       degree = 180;       break;     }     return degree;   } } 

package com.wwj.finger;   import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.os.Bundle; import android.widget.ImageView;  public class ShowPicActivity extends Activity {   private ImageView ivPic = null; // 显示图片控件     /**    * Activity在创建的时候回调的函数 主要用来初始化一些变量    */   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.showpic);     ivPic = (ImageView) findViewById(R.id.ivPic);     setImageBitmap(getImageFormBundle());    }     /**    * 将MainActivity传过来的图片显示在界面当中    *    * @param bytes    */   public void setImageBitmap(byte[] bytes) {     Bitmap cameraBitmap = byte2Bitmap();     // 根据拍摄的方向旋转图像（纵向拍摄时要需要将图像选择90度)     Matrix matrix = new Matrix();     matrix.setRotate(MainActivity.getPreviewDegree(this));     cameraBitmap = Bitmap         .createBitmap(cameraBitmap, 0, 0, cameraBitmap.getWidth(),             cameraBitmap.getHeight(), matrix, true);     ivPic.setImageBitmap(cameraBitmap);   }    /**    * 从Bundle对象中获取数据    *    * @return    */   public byte[] getImageFormBundle() {     Intent intent = getIntent();     Bundle data = intent.getExtras();     byte[] bytes = data.getByteArray("bytes");     return bytes;   }    /**    * 将字节数组的图形数据转换为Bitmap    *    * @return    */   private Bitmap byte2Bitmap() {     byte[] data = getImageFormBundle();     // 将byte数组转换成Bitmap对象     Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);     return bitmap;   } }