Android Camera（二）

上次已经写过SurfaceView显示Camera摄像了，代码可以运行，但是里面有问题，这次纠正过来，顺便实现变焦：

代码：

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public class CameravedioActivity extends Activity{

private static final String TAG = "CameravedioActivity";

private Camera camera;

private boolean preview = false ;

private SeekBar mSeekBar;

private SurfaceView surfaceView;

private SurfaceHolder surfaceHolder;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

/*

*设置窗口属性：一定要在 setContentView(R.layout.main) 之前

*/

// 窗口标题,其实可以在manifes文件里面注册

// requestWindowFeature(Window.FEATURE_NO_TITLE);

// 全屏

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.main);

surfaceView = (SurfaceView) findViewById(R.id.surfaceView);

surfaceHolder = surfaceView.getHolder();

surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

surfaceView.getHolder().setFixedSize(200, 200);

surfaceView.getHolder().addCallback(new SurfaceViewCallback());

/**

* seekbar 用来实现变焦逻辑

*/

mSeekBar = (SeekBar)findViewById(R.id.seekbar);

mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

// TODO Auto-generated method stub

Log.d(TAG, "progress:"+progress);

// sdk 文档描述 set zoom 之前先check

if(camera.getParameters().isZoomSupported()){

Parameters params = camera.getParameters();

params.setZoom(progress);

camera.setParameters(params);

}

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

Log.d(TAG, "onStartTrackingTouch");

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

Log.d(TAG, "onStartTrackingTouch");

}

});

}

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

}

public static void setCameraDisplayOrientation(Activity activity,

int cameraId, android.hardware.Camera camera) {

android.hardware.Camera.CameraInfo info =

new android.hardware.Camera.CameraInfo();

android.hardware.Camera.getCameraInfo(cameraId, info);

int rotation = activity.getWindowManager().getDefaultDisplay()

.getRotation();

int degrees = 0;

Log.d(TAG, "rotation:"+rotation);

switch (rotation) {

case Surface.ROTATION_0: degrees = 0; break;

case Surface.ROTATION_90: degrees = 90; break;

case Surface.ROTATION_180: degrees = 180; break;

case Surface.ROTATION_270: degrees = 270; break;

}

int result;

if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

result = (info.orientation + degrees) % 360;

result = (360 - result) % 360; // compensate the mirror

} else { // back-facing

result = (info.orientation - degrees + 360) % 360;

}

camera.setDisplayOrientation(result);

}

private final class SurfaceViewCallback implements Callback {

/**

* surfaceView 被创建成功后调用此方法

*/

@Override

public void surfaceCreated(SurfaceHolder holder) {

Log.d(TAG,"surfaceCreated");

/*

* 在SurfaceView创建好之后 打开摄像头

* 注意是 android.hardware.Camera

*/

// 2.2获取摄像头number physical cameras

// api 9: Camera.getNumberOfCameras()

Log.d(TAG, "numbers:"+Camera.getNumberOfCameras());

if(Camera.getNumberOfCameras() ==2){

// 前置摄像头

// api 9 :Camera.CameraInfo

camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);

camera.setDisplayOrientation(90);

}else{

camera = Camera.open();

}

// camera = Camera.open();

// setCameraDisplayOrientation(CameravedioActivity.this,Camera.CameraInfo.CAMERA_FACING_FRONT,camera);

Log.d(TAG, "smoothZoom:"+camera.getParameters().isSmoothZoomSupported());

Log.d(TAG, "supportzoom:"+camera.getParameters().isZoomSupported());

Log.d(TAG, "max zoom:"+camera.getParameters().getMaxZoom());

/*

* This method must be called before startPreview(). otherwise surfaceview没有图像

*/

try {

camera.setPreviewDisplay(surfaceHolder);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Camera.Parameters parameters = camera.getParameters();

/* 每秒从摄像头捕获5帧画面， */

parameters.setPreviewFrameRate(5);

/* 设置照片的输出格式:jpg */

parameters.setPictureFormat(PixelFormat.JPEG);

/* 照片质量 */

parameters.set("jpeg-quality", 85);

mSeekBar.setMax(parameters.getMaxZoom());

// valid parameters:

// 取得相机所支持多少图片大小的个数

List<Size> pszize = parameters.getSupportedPreviewSizes();

// List<Size> pszize = parameters.getSupportedPictureSizes();

if (null != pszize && 0 < pszize.size()) {

int height[] = new int[pszize.size()];// 声明一个数组

Map<Integer, Integer> map = new HashMap<Integer, Integer>();

for (int i = 0; i < pszize.size(); i++) {

Size size = (Size) pszize.get(i);

int sizeheight = size.height;

int sizewidth = size.width;

height[i] = sizeheight;

map.put(sizeheight, sizewidth);

Log.d(TAG, "size.width:"+sizewidth+"\tsize.height:"+sizeheight);

}

Arrays.sort(height);

// 设置

// parameters.setPictureSize(map.get(height[0]),height[0]);

parameters.setPreviewSize(map.get(height[0]),height[0]);

}

/* 将参数对象赋予到 camera 对象上 */

camera.setParameters(parameters);

camera.startPreview();

/**

* Installs a callback to be invoked for every preview frame in addition to displaying them on the screen.

* The callback will be repeatedly called for as long as preview is active. This method can be called at

* any time, even while preview is live. Any other preview callbacks are overridden.

* a callback object that receives a copy of each preview frame, or null to stop receiving

*/

camera.setPreviewCallback(new Camera.PreviewCallback(){

@Override

public void onPreviewFrame(byte[] data, Camera camera) {

// TODO Auto-generated method stub

//在视频聊天中，这里传送本地frame数据给remote端

// Log.d(TAG, "camera:"+camera);

// Log.d(TAG, "byte:"+data);

}

});

preview = true;

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

Log.d(TAG,"surfaceChanged");

}

/**

* SurfaceView 被销毁时释放掉 摄像头

*/

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

if(camera != null) {

/* 若摄像头正在工作，先停止它 */

if(preview) {

camera.stopPreview();

preview = false;

}

//如果注册了此回调，在release之前调用，否则release之后还回调，crash

camera.setPreviewCallback(null);

camera.release();

}

}

}

}

注册文件：

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<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="cn.edu.wtu"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/app_name">

<!-- android:screenOrientation="landscape" 表示横向界面 -->

<activity android:name=".CameravedioActivity" android:label="@string/app_name" android:screenOrientation="portrait">

<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" />

<!-- 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"/>

<!-- 申请使用摄像头的权限 -->

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

</manifest>

布局文件：

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<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical"

>

<SurfaceView

android:id="@+id/surfaceView"

android:layout_width="200dip"

android:layout_height="150dip"

android:layout_gravity="center"

android:visibility="visible"

/>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

>

<SeekBar

android:id="@+id/seekbar"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="40dip"

android:layout_marginRight="40dip"

android:layout_gravity="center"

android:progressDrawable="@android:color/transparent"

android:background="@drawable/progressbar_box"

/>

</LinearLayout>

</LinearLayout>

</FrameLayout>

seekbar用来实现调焦的