Android自定義照相機(jī)的實例

<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" > 
  <!-- 顯示預(yù)覽圖形 --> 
  <SurfaceView  
    android:id="@+id/surfaceView" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    /> 
  <!-- 相對布局，放置兩個按鈕 --> 
    <RelativeLayout 
      android:id="@+id/buttonLayout" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:visibility="gone" 
    > 
    <!-- 拍照按鈕 --> 
    <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中創(chuàng)建與刪除文件權(quán)限 --> 
  <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> 
  <!-- 往SDCard寫入數(shù)據(jù)權(quán)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; // 聲明一個Bundle對象，用來存儲數(shù)據(jù) 
 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    // 顯示界面 
    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); //設(shè)置Surface分辨率 
    surfaceView.getHolder().setKeepScreenOn(true);// 屏幕常亮 
    surfaceView.getHolder().addCallback(new SurfaceCallback());//為SurfaceView的句柄添加一個回調(diào)函數(shù) 
  } 
 
  /** 
   * 按鈕被點擊觸發(fā)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; 
      } 
    } 
  } 
 
  /** 
   * 圖片被點擊觸發(fā)的時間 
   * 
   * @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); //將圖片字節(jié)數(shù)據(jù)保存在bundle當(dāng)中，實現(xiàn)數(shù)據(jù)交換 
        saveToSDCard(data); // 保存圖片到sd卡中 
        Toast.makeText(getApplicationContext(), R.string.success, 
            Toast.LENGTH_SHORT).show(); 
        camera.startPreview(); // 拍完照后，重新開始預(yù)覽 
 
      } catch (Exception e) { 
        e.printStackTrace(); 
      } 
    } 
  } 
 
  /** 
   * 將拍下來的照片存放在SD卡中 
   * @param data  
   * @throws IOException 
   */ 
  public static void saveToSDCard(byte[] data) throws IOException { 
    Date date = new Date(); 
    SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); // 格式化時間 
    String filename = format.format(date) + ".jpg"; 
    File fileFolder = new File(Environment.getExternalStorageDirectory() 
        + "/finger/"); 
    if (!fileFolder.exists()) { // 如果目錄不存在，則創(chuàng)建一個名為"finger"的目錄 
      fileFolder.mkdir(); 
    } 
    File jpgFile = new File(fileFolder, filename); 
    FileOutputStream outputStream = new FileOutputStream(jpgFile); // 文件輸出流 
    outputStream.write(data); // 寫入sd卡中 
    outputStream.close(); // 關(guān)閉輸出流 
  } 
 
 
  private final class SurfaceCallback implements Callback { 
 
    // 拍照狀態(tài)變化時調(diào)用該方法 
    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, 
        int height) { 
      parameters = camera.getParameters(); // 獲取各項參數(shù) 
      parameters.setPictureFormat(PixelFormat.JPEG); // 設(shè)置圖片格式 
      parameters.setPreviewSize(width, height); // 設(shè)置預(yù)覽大小 
      parameters.setPreviewFrameRate(5); //設(shè)置每秒顯示4幀 
      parameters.setPictureSize(width, height); // 設(shè)置保存的圖片尺寸 
      parameters.setJpegQuality(80); // 設(shè)置照片質(zhì)量 
    } 
 
    // 開始拍照時調(diào)用該方法 
    @Override 
    public void surfaceCreated(SurfaceHolder holder) { 
      try { 
        camera = Camera.open(); // 打開攝像頭 
        camera.setPreviewDisplay(holder); // 設(shè)置用于顯示拍照影像的SurfaceHolder對象 
        camera.setDisplayOrientation(getPreviewDegree(MainActivity.this)); 
        camera.startPreview(); // 開始預(yù)覽 
      } catch (Exception e) { 
        e.printStackTrace(); 
      } 
 
    } 
 
    // 停止拍照時調(diào)用該方法 
    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) { 
      if (camera != null) { 
        camera.release(); // 釋放照相機(jī) 
        camera = null; 
      } 
    } 
  } 
 
  /** 
   * 點擊手機(jī)屏幕是，顯示兩個按鈕 
   */ 
  @Override 
  public boolean onTouchEvent(MotionEvent event) { 
    switch (event.getAction()) { 
    case MotionEvent.ACTION_DOWN: 
      layout.setVisibility(ViewGroup.VISIBLE); // 設(shè)置視圖可見 
      break; 
    } 
    return true; 
  } 
 
   
  @Override 
  public boolean onKeyDown(int keyCode, KeyEvent event) { 
    switch (keyCode) { 
    case KeyEvent.KEYCODE_CAMERA: // 按下拍照按鈕 
      if (camera != null && event.getRepeatCount() == 0) { 
        // 拍照 
        //注：調(diào)用takePicture()方法進(jìn)行拍照是傳入了一個PictureCallback對象——當(dāng)程序獲取了拍照所得的圖片數(shù)據(jù)之后 
        //，PictureCallback對象將會被回調(diào)，該對象可以負(fù)責(zé)對相片進(jìn)行保存或傳入網(wǎng)絡(luò) 
        camera.takePicture(null, null, new MyPictureCallback()); 
      } 
    } 
    return super.onKeyDown(keyCode, event); 
  } 
 
  // 提供一個靜態(tài)方法，用于根據(jù)手機(jī)方向獲得相機(jī)預(yù)覽畫面旋轉(zhuǎn)的角度 
  public static int getPreviewDegree(Activity activity) { 
    // 獲得手機(jī)的方向 
    int rotation = activity.getWindowManager().getDefaultDisplay() 
        .getRotation(); 
    int degree = 0; 
    // 根據(jù)手機(jī)的方向計算相機(jī)預(yù)覽畫面應(yīng)該選擇的角度 
    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; // 顯示圖片控件 
 
 
  /** 
   * Activity在創(chuàng)建的時候回調(diào)的函數(shù) 主要用來初始化一些變量 
   */ 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.showpic); 
    ivPic = (ImageView) findViewById(R.id.ivPic); 
    setImageBitmap(getImageFormBundle()); 
 
  } 
 
 
  /** 
   * 將MainActivity傳過來的圖片顯示在界面當(dāng)中 
   * 
   * @param bytes 
   */ 
  public void setImageBitmap(byte[] bytes) { 
    Bitmap cameraBitmap = byte2Bitmap(); 
    // 根據(jù)拍攝的方向旋轉(zhuǎn)圖像（縱向拍攝時要需要將圖像選擇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); 
  } 
 
  /** 
   * 從Bundle對象中獲取數(shù)據(jù) 
   * 
   * @return 
   */ 
  public byte[] getImageFormBundle() { 
    Intent intent = getIntent(); 
    Bundle data = intent.getExtras(); 
    byte[] bytes = data.getByteArray("bytes"); 
    return bytes; 
  } 
 
  /** 
   * 將字節(jié)數(shù)組的圖形數(shù)據(jù)轉(zhuǎn)換為Bitmap 
   * 
   * @return 
   */ 
  private Bitmap byte2Bitmap() { 
    byte[] data = getImageFormBundle(); 
    // 將byte數(shù)組轉(zhuǎn)換成Bitmap對象 
    Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); 
    return bitmap; 
  } 
}