Android 更改方向会导致相机破坏其当前活动，然后重新创建
我正在使用自定义相机拍摄图像，并支持我编写的两个不同的XML的所有设备和屏幕方向 一个用于纵向模式（在分辨率>布局下），第二个用于横向模式（在分辨率>布局地下） 例如：Android 更改方向会导致相机破坏其当前活动，然后重新创建,android,camera,Android,Camera,我正在使用自定义相机拍摄图像，并支持我编写的两个不同的XML的所有设备和屏幕方向 一个用于纵向模式（在分辨率>布局下），第二个用于横向模式（在分辨率>布局地下） 例如： 我的相机已初始化，我已准备好拍摄/捕获图像------->但我的相机预览模式仍为横向模式 现在我决定使用纵向模式拍摄图像（因此我将相机的旋转方向从横向模式更改为纵向模式），但是在以纵向模式启动相机之前，其关闭和打开相机镜头。。。。。（简而言之，重新初始化我的相机） CameraLauncherActivity.java:- @O
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
mCamera = getCameraInstance();
mCameraPreview = new PreviewSurface(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mCameraPreview);
Button captureButton = (Button) findViewById(R.id.btnCapture);
Log.d(CameraLauncherActivity.LOG_TAG, "captureButton :: " + captureButton);
captureButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCamera.takePicture(null, null, mPicture);
Log.d(CameraLauncherActivity.LOG_TAG, "mCamera.takePicture :: " + mCamera);
}
});
}
private Camera getCameraInstance() {
Camera camera = null;
Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()Camera:: " + camera);
try {
camera = Camera.open(0);
Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()open:: " + camera);
} catch (Exception e) {
// cannot get camera or does not exist
}
if(camera!=null){
// get supported sizes:
// List<Size> localSizes = camera.getParameters().getSupportedPreviewSizes();
// loop through localSizes to get closest size
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(640, 480);
camera.setParameters(parameters);
}
return camera;
}
PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
pictureFile = getOutputMediaFile();
camera.startPreview();
if (pictureFile == null) {
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
};
public class PreviewSurface extends SurfaceView implements
SurfaceHolder.Callback {
public static final String LOG_TAG = "CameraPreview";
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;
// Constructor that obtains context and camera
@SuppressWarnings("deprecation")
public PreviewSurface(Context context, Camera camera) {
super(context);
this.mCamera = camera;
this.mSurfaceHolder = this.getHolder();
this.mSurfaceHolder.addCallback(this);
this.mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
this.mSurfaceHolder.setFixedSize(100, 100);
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
try {
Camera.Parameters parameters = mCamera.getParameters();
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE)
{
parameters.set("orientation", "portrait");
mCamera.setDisplayOrientation(90);
parameters.setRotation(90);
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
}
else
{
// This is an undocumented although widely known feature
parameters.set("orientation", "landscape");
// For Android 2.2 and above
mCamera.setDisplayOrientation(0);
// Uncomment for Android 2.0 and above
parameters.setRotation(0);
}
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
} catch (IOException e) {
// left blank for now
}
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
mCamera.stopPreview();
mCamera.release();
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format,
int width, int height) {
try {
Camera.Parameters parameters = mCamera.getParameters();
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
parameters.set("orientation", "portrait");
mCamera.setDisplayOrientation(90);
parameters.setRotation(90);
}
else {
// This is an undocumented although widely known feature
parameters.set("orientation", "landscape");
// For Android 2.2 and above
mCamera.setDisplayOrientation(0);
// Uncomment for Android 2.0 and above
parameters.setRotation(0);
}
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
} catch (IOException e) {
// left blank for now
}
}
<activity
android:name="com.example.camera.CameraLauncherActivity"
android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" />
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
mCamera = getCameraInstance();
mCameraPreview = new PreviewSurface(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mCameraPreview);
Button captureButton = (Button) findViewById(R.id.btnCapture);
Log.d(CameraLauncherActivity.LOG_TAG, "captureButton :: " + captureButton);
captureButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCamera.takePicture(null, null, mPicture);
Log.d(CameraLauncherActivity.LOG_TAG, "mCamera.takePicture :: " + mCamera);
}
});
}
private Camera getCameraInstance() {
Camera camera = null;
Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()Camera:: " + camera);
try {
camera = Camera.open(0);
Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()open:: " + camera);
} catch (Exception e) {
// cannot get camera or does not exist
}
if(camera!=null){
// get supported sizes:
// List<Size> localSizes = camera.getParameters().getSupportedPreviewSizes();
// loop through localSizes to get closest size
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(640, 480);
camera.setParameters(parameters);
}
return camera;
}
PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
pictureFile = getOutputMediaFile();
camera.startPreview();
if (pictureFile == null) {
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
};
public class PreviewSurface extends SurfaceView implements
SurfaceHolder.Callback {
public static final String LOG_TAG = "CameraPreview";
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;
// Constructor that obtains context and camera
@SuppressWarnings("deprecation")
public PreviewSurface(Context context, Camera camera) {
super(context);
this.mCamera = camera;
this.mSurfaceHolder = this.getHolder();
this.mSurfaceHolder.addCallback(this);
this.mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
this.mSurfaceHolder.setFixedSize(100, 100);
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
try {
Camera.Parameters parameters = mCamera.getParameters();
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE)
{
parameters.set("orientation", "portrait");
mCamera.setDisplayOrientation(90);
parameters.setRotation(90);
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
}
else
{
// This is an undocumented although widely known feature
parameters.set("orientation", "landscape");
// For Android 2.2 and above
mCamera.setDisplayOrientation(0);
// Uncomment for Android 2.0 and above
parameters.setRotation(0);
}
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
} catch (IOException e) {
// left blank for now
}
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
mCamera.stopPreview();
mCamera.release();
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format,
int width, int height) {
try {
Camera.Parameters parameters = mCamera.getParameters();
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
parameters.set("orientation", "portrait");
mCamera.setDisplayOrientation(90);
parameters.setRotation(90);
}
else {
// This is an undocumented although widely known feature
parameters.set("orientation", "landscape");
// For Android 2.2 and above
mCamera.setDisplayOrientation(0);
// Uncomment for Android 2.0 and above
parameters.setRotation(0);
}
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
} catch (IOException e) {
// left blank for now
}
}
<activity
android:name="com.example.camera.CameraLauncherActivity"
android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" />
对，这就是它的工作方式，关闭活动，破坏表面。但是，如果您认为camera.open（）太慢，无法经常调用，则可以将
camera.release（）