Android 使用攝像頭拍照

<!-- lang: xml -->
拍照必須設置權限：

<uses-permission android:name="android.permission.CAMERA"/>

一、佈局main.xml

<?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" android:gravity="center_horizontal" > <SurfaceView android:id="@+id/mySurfaceView" android:gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="200px" /> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" > <Button android:id="@+id/btnOpen" android:textSize="18px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="打開" /> <Button android:id="@+id/btnClose" android:textSize="18px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="關閉" /> <Button android:id="@+id/btnTake" android:textSize="18px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="拍照" /> </LinearLayout>
<ImageView android:id="@+id/myImageView" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>

<!-- lang: java -->
二、初始化組件：
private SurfaceView mySurfaceView = null;//SurfaceView的引用
private SurfaceHolder mySurfaceHolder = null;//SurfaceHolder的引用
private Button btnOpen = null;//打開按鈕
private Button btnClose = null;//關閉按鈕
private Button btnTake = null;//拍照按鈕

添加監聽器：OnClickListener, SurfaceHolder.Callback super.onCreate(savedInstanceState);

//全屏
	requestWindowFeature(Window.FEATURE_NO_TITLE); 
	getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN ,  
	WindowManager.LayoutParams.FLAG_FULLSCREEN);
    
    setContentView(R.layout.main);
    
    mySurfaceView = (SurfaceView) findViewById(R.id.mySurfaceView);//獲得SurfaceView的引用
    btnOpen = (Button) findViewById(R.id.btnOpen);//獲得按鈕的引用
    btnClose = (Button) findViewById(R.id.btnClose);//獲得按鈕的引用
    btnTake = (Button) findViewById(R.id.btnTake);//獲得按鈕的引用
    btnOpen.setOnClickListener(this);//爲按鈕添加監聽
    btnClose.setOnClickListener(this);//爲按鈕添加監聽
    btnTake.setOnClickListener(this);//爲按鈕添加監聽
    
    
    mySurfaceHolder = mySurfaceView.getHolder();//得到SurfaceHolder
    mySurfaceHolder.addCallback(this);//添加接口的實現
    mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

三、使用CAMERA拍照 private Camera myCamera = null;//Camera的引用 boolean isView = false;//是否在瀏覽中

1）、初始化照相機:

public void initCamera(){ if(!isView){ myCamera = Camera.open(); } if(myCamera != null && !isView){ try { Camera.Parameters myParameters = myCamera.getParameters(); myParameters.setPictureFormat(PixelFormat.JPEG); //真機刪除setPreviewSize方法 myParameters.setPreviewSize(200, 200);//屏幕大小 myCamera.setParameters(myParameters); myCamera.setPreviewDisplay(mySurfaceHolder); myCamera.startPreview();//當即運行Preview } catch (IOException e) {//捕獲異常 e.printStackTrace();//打印錯誤信息 } isView = true; } }

二、打開/關閉和拍照
	@Override
public void onClick(View v) {
	// TODO Auto-generated method stub
	switch (v.getId()) {
	//打開照相機
	case R.id.btnOpen:
		initCamera();
		break;

	case R.id.btnClose:
		if(myCamera != null && isView){//當正在顯示時
			isView = false;
			myCamera.stopPreview();
			myCamera.release();
			myCamera = null;
		}
		break;
		
	//拍照
	case R.id.btnTake:
		myCamera.takePicture
(myShutterCallback, myRawCallback, myjpegCallback);
		break;
	}
}

//相機快門關閉
ShutterCallback myShutterCallback = new ShutterCallback() {
	
	@Override
	public void onShutter() {
		// TODO Auto-generated method stub
		
	}
};

//照片二進制流生成
PictureCallback myRawCallback = new PictureCallback() {
	
	@Override
	public void onPictureTaken(byte[] data, Camera camera) {
		// TODO Auto-generated method stub
		
	}
};

//預覽圖片
PictureCallback myjpegCallback = new PictureCallback(){
	@Override
	public void onPictureTaken(byte[] data, Camera camera) {
		Bitmap bm = 
	BitmapFactory.decodeByteArray(data, 0, data.length);
		ImageView myImageView = 
		(ImageView) findViewById(R.id.myImageView);
		myImageView.setImageBitmap(bm);//將圖片顯示到下方的ImageView中
		
		isView = false;
		myCamera.stopPreview();
		myCamera.release();
		myCamera = null;

		initCamera();//初始化相機
	}
};