android:相机 onPause/onResume 问题 [英] android: camera onPause/onResume issue
问题描述
我在使用 onPause() onResume() 摄像头直播周期时遇到了一些问题:带预览功能的相机和拍照功能都很好.除了一个例外:
我启动应用程序，单击主页按钮，切换回应用程序并拍摄另一张照片.
结果:shuttercallback 仍在执行(参见代码)，但 jpeg 回调不再执行！然后我的星系 S 振动，屏幕保持黑色，因为在 jpegCallback 之后没有重新触发 startPreview().堆栈跟踪对我来说远没有用.奇怪的是，这只发生在我的 Galaxy S 上，而不是模拟器上.我真的不知道如何继续前进:/有人知道什么有用吗?
<上一页>10-28 18:59:40.649:错误/SecCamera(4291):SetRotate(角度(0))10-28 18:59:40.649: 错误/CameraHardwareSec(4291): ====setParameters processingmethod = (null)10-28 18:59:40.649:错误/SecCamera(4291):setRecordingSize(宽度(800)，高度(480))10-28 18:59:40.673:错误/SecCamera(4291):SetRotate(角度(0))10-28 18:59:40.673: 错误/CameraHardwareSec(4291): ====setParameters processingmethod = (null)10-28 18:59:40.673:错误/SecCamera(4291):setRecordingSize(宽度(800)，高度(480))10-28 18:59:40.692:错误/SecCamera(4291):SetRotate(角度(0))10-28 18:59:40.692: 错误/CameraHardwareSec(4291): ====setParameters processingmethod = (null)10-28 18:59:40.692:错误/SecCamera(4291):setRecordingSize(宽度(800)，高度(480))10-28 18:59:40.712:错误/SecCamera(4291):SetRotate(角度(0))10-28 18:59:40.712: 错误/CameraHardwareSec(4291): ====setParameters processingmethod = (null)10-28 18:59:40.712:错误/SecCamera(4291):setRecordingSize(宽度(800)，高度(480))10-28 18:59:40.751: 错误/CameraHardwareSec(4291): stopPreview()10-28 18:59:40.751: 错误/SecCamera(4291): cancelAutofocus()10-28 18:59:40.751: 错误/SecCamera(4291): cancelAutofocus() end, 0, 410-28 18:59:40.768: 错误/SecCamera(4291): stopPreview()10-28 18:59:40.768: 错误/SecCamera(4291): fimc_v4l2_streamoff()10-28 18:59:40.797: 错误/CameraHardwareSec(4291): stopPreview() 结束10-28 18:59:41.622: 错误/SecCamera(4291): fimc_v4l2_streamoff()10-28 18:59:46.536:错误/dalvikvm(2993):无法将堆栈跟踪写入/data/anr/traces.txt(2970 中的 2775):未知错误:010-28 18:59:46.540: 错误/dalvikvm(2919): 无法将堆栈跟踪写入/data/anr/traces.txt (-1 of 3414): 数学结果不可表示10-28 18:59:46.610: 错误/dalvikvm(3044): 无法将堆栈跟踪写入/data/anr/traces.txt (3354 of 7154): 数学结果不可表示...这是我的(缩短的)代码:
<上一页>公共类 CameraActivity 扩展 Activity 实现 MenuViewCallback、CutoutPathManagerCallback {public static final String TAG = "CutoutCamera";预览预览；OverlayView 覆盖；静态MenuView menuView；@覆盖公共无效 onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//隐藏窗口标题.requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);...preview = (Preview) this.findViewById(R.id.preview);...}...@覆盖受保护的无效 onResume() {超级.onResume();this.log("onResume()");预览.openCamera();}@覆盖受保护的无效 onPause() {超级.onPause();this.log("onPause()");if (preview.camera != null) {preview.camera.release();preview.camera = null;}}//快门打开时调用ShutterCallback shutterCallback = new ShutterCallback() {//公共无效 onShutter() {Log.d(TAG, "onShutter'd");}};//处理原始图片的数据PictureCallback rawCallback = new PictureCallback() {//public void onPictureTaken(byte[] data, Camera camera) {Log.d(TAG, "onPictureTaken - raw");}};//处理jpeg图片的数据PictureCallback jpegCallback = new PictureCallback() {//public void onPictureTaken(byte[] data, Camera camera) {Log.d(TAG, "onPictureTaken - jpeg");...}};@覆盖公共无效 shootButtonClicked() {preview.camera.takePicture(shutterCallback, rawCallback, jpegCallback);}@覆盖公共无效focusButtonClicked(){preview.camera.autoFocus(new Camera.AutoFocusCallback() {public void onAutoFocus(布尔成功，相机相机){}});}}<上一页>/*** 执行顺序:* 开放式摄像头()* onMeasure()* onLayout()* onMeasure()* onLayout()* 表面创建()* 表面变化()* onMeasure()* onLayout()* onMeasure()* @作者斯蒂芬**/类 Preview 扩展 ViewGroup 实现 SurfaceHolder.Callback {//私人静态最终字符串标签=预览"；SurfaceHolder mHolder；//公共摄像头摄像头；//私有列表supportedPreviewSizes；私人尺寸 previewSize;SurfaceView mSurfaceView；相机活动相机活动；int l2 = 0, t2 = 0, r2 = 0, b2 = 0;int 填充 = 20;尺寸最佳预览尺寸、最佳图片尺寸；//这个视图的大小.在 onMeasure() 中设置整型全宽，全高；公共预览(上下文上下文){超级(上下文)；初始化(上下文)；}公共预览(上下文上下文，AttributeSet attrs){超级(上下文，属性)；初始化(上下文)；}公共预览(上下文上下文，AttributeSet attrs，int defStyle){超级(上下文，属性，defStyle)；初始化(上下文)；}私人无效初始化(上下文上下文){setKeepScreenOn(true);cameraActivity = (CameraActivity) 上下文；mSurfaceView = new SurfaceView(context);addView(mSurfaceView);mHolder = mSurfaceView.getHolder();//mHolder.addCallback(this);//mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//}...公共无效openCamera(){cameraActivity.log("openCamera()");如果(this.camera == null){cameraActivity.log("Camera.open()");this.camera = Camera.open();//supportedPreviewSizes = camera.getParameters().getSupportedPreviewSizes();请求布局()；//-> onMeassure() -> onLayout()}}@覆盖受保护的无效onMeasure(int widthMeasureSpec，int heightMeasureSpec){cameraActivity.log("onMeasure()");//我们故意忽略子测量，因为充当//封装到以相机预览为中心的 SurfaceView//拉伸它.fullWidth = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);fullHeight = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);setMeasuredDimension(fullWidth, fullHeight);如果(this.camera ！= null){cameraActivity.log("fullSize:"+fullWidth+"x"+fullHeight);this.setCameraPreviewSize();this.setCameraPictureSize();}}私人无效 calcScaledPreviewSize(){...}...私人无效 setCameraPreviewSize() {Camera.Parameters 参数 = camera.getParameters();if(parameters.getPreviewSize() != this.getOptimalPreviewSize()){参数.setPreviewSize(this.getOptimalPreviewSize().width, this.getOptimalPreviewSize().height);this.camera.setParameters(参数);}}私人无效 setCameraPictureSize() {Camera.Parameters 参数 = this.camera.getParameters();如果(参数.getPictureSize()！= this.getOptimalCameraPictureSize()){参数.setPictureSize(getOptimalCameraPictureSize().width, getOptimalCameraPictureSize().height);this.camera.setParameters(参数);}}@覆盖protected void onLayout(boolean changed, int l, int t, int r, int b) {cameraActivity.log("onLayout()");if (更改 && getChildCount() > 0 && this.camera != null) {最终视图子 = getChildAt(0);cameraActivity.log("r:"+this.getPreviewRight()+" l:"+this.getPreviewLeft()+" b:"+this.getPreviewBottom()+" t:"+this.getPreviewTop());child.layout(this.getPreviewLeft(), this.getPreviewTop(), this.getPreviewRight(), this.getPreviewBottom());cameraActivity.initOverlay(this.getPreviewLeft(),this.getPreviewTop(),this.getPreviewRight(),this.getPreviewBottom());}}私人尺寸 getOptimalPreviewSize() {if(optimalPreviewSize == null){//计算最佳预览尺寸}返回最佳预览尺寸；}私人尺寸 getOptimalCameraPictureSize() {如果(最佳图片大小 == 空){//计算最佳图像尺寸}返回最佳图片大小；}//一旦持有者准备好调用public void surfaceCreated(SurfaceHolder holder) {////Surface 已创建，获取相机并告诉它在哪里//绘制.cameraActivity.log("surfaceCreated()");尝试 {if (this.camera != null) {this.camera.setPreviewDisplay(holder);}} 捕捉(IOException 异常){Log.e(TAG, "由 setPreviewDisplay() 引起的 IOException", 异常);}}公共无效surfaceChanged(SurfaceHolder持有人，int格式，int w，int h){cameraActivity.log("surfaceChanged()");如果(相机！= null){Camera.Parameters 参数 = camera.getParameters();参数.setPreviewSize(getOptimalPreviewSize().width, getOptimalPreviewSize().height);请求布局()；camera.setParameters(参数);camera.startPreview();}}public void surfaceDestroyed(SurfaceHolder holder) {//cameraActivity.log("surfaceDestroyed()");如果(this.camera ！= null){camera.stopPreview();}}公共无效释放相机(){cameraActivity.log("releaseCamera()");如果(相机！= null){camera.stopPreview();camera.setPreviewCallback(null);相机.release();相机=空；}}}
这就是我最终 100% 修复它的方法(在我尝试过的所有设备上工作，包括 Galaxy S):
我在 onResume 上销毁了camer预览对象并一起重新实例化(就像在启动时一样).更多细节在这里:
I have some troubles with the onPause() onResume() camera live cycle: Camera with preview, and taking photos works totally fine. With one exceptions:
I start the app, click the home button, switch back to the app and take another shot.
Result: shuttercallback is still executed (see code), but jpeg callback isn't anymore! Then my galaxy S vibrates, and the screen stays black, since startPreview() is not re-triggered after jpegCallback. The stack trace is far from usefull for me. Strange thing is that this only happens on my Galaxy S, not on the emulator. I have really no clue how to move on :/ Anyone has an idea what could be usefull?
10-28 18:59:40.649: ERROR/SecCamera(4291): SetRotate(angle(0)) 10-28 18:59:40.649: ERROR/CameraHardwareSec(4291): ====setParameters processingmethod = (null) 10-28 18:59:40.649: ERROR/SecCamera(4291): setRecordingSize(width(800), height(480)) 10-28 18:59:40.673: ERROR/SecCamera(4291): SetRotate(angle(0)) 10-28 18:59:40.673: ERROR/CameraHardwareSec(4291): ====setParameters processingmethod = (null) 10-28 18:59:40.673: ERROR/SecCamera(4291): setRecordingSize(width(800), height(480)) 10-28 18:59:40.692: ERROR/SecCamera(4291): SetRotate(angle(0)) 10-28 18:59:40.692: ERROR/CameraHardwareSec(4291): ====setParameters processingmethod = (null) 10-28 18:59:40.692: ERROR/SecCamera(4291): setRecordingSize(width(800), height(480)) 10-28 18:59:40.712: ERROR/SecCamera(4291): SetRotate(angle(0)) 10-28 18:59:40.712: ERROR/CameraHardwareSec(4291): ====setParameters processingmethod = (null) 10-28 18:59:40.712: ERROR/SecCamera(4291): setRecordingSize(width(800), height(480)) 10-28 18:59:40.751: ERROR/CameraHardwareSec(4291): stopPreview() 10-28 18:59:40.751: ERROR/SecCamera(4291): cancelAutofocus() 10-28 18:59:40.751: ERROR/SecCamera(4291): cancelAutofocus() end, 0, 4 10-28 18:59:40.768: ERROR/SecCamera(4291): stopPreview() 10-28 18:59:40.768: ERROR/SecCamera(4291): fimc_v4l2_streamoff() 10-28 18:59:40.797: ERROR/CameraHardwareSec(4291): stopPreview() end 10-28 18:59:41.622: ERROR/SecCamera(4291): fimc_v4l2_streamoff() 10-28 18:59:46.536: ERROR/dalvikvm(2993): Failed to write stack traces to /data/anr/traces.txt (2775 of 2970): Unknown error: 0 10-28 18:59:46.540: ERROR/dalvikvm(2919): Failed to write stack traces to /data/anr/traces.txt (-1 of 3414): Math result not representable 10-28 18:59:46.610: ERROR/dalvikvm(3044): Failed to write stack traces to /data/anr/traces.txt (3354 of 7154): Math result not representable ...
Here is my (shortened) code:
public class CameraActivity extends Activity implements MenuViewCallback, CutoutPathManagerCallback {
public static final String TAG = "CutoutCamera";
Preview preview;
OverlayView overlay;
static MenuView menuView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the window title.
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
...
preview = (Preview) this.findViewById(R.id.preview);
...
}
...
@Override
protected void onResume() {
super.onResume();
this.log("onResume()");
preview.openCamera();
}
@Override
protected void onPause() {
super.onPause();
this.log("onPause()");
if (preview.camera != null) {
preview.camera.release();
preview.camera = null;
}
}
// Called when shutter is opened
ShutterCallback shutterCallback = new ShutterCallback() { //
public void onShutter() {
Log.d(TAG, "onShutter'd");
}
};
// Handles data for raw picture
PictureCallback rawCallback = new PictureCallback() { //
public void onPictureTaken(byte[] data, Camera camera) {
Log.d(TAG, "onPictureTaken - raw");
}
};
// Handles data for jpeg picture
PictureCallback jpegCallback = new PictureCallback() { //
public void onPictureTaken(byte[] data, Camera camera) {
Log.d(TAG, "onPictureTaken - jpeg");
...
}
};
@Override
public void shootButtonClicked() {
preview.camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
@Override
public void focusButtonClicked() {
preview.camera.autoFocus(new Camera.AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
}
});
}
}
/**
* order of execution:
* openCamera()
* onMeasure()
* onLayout()
* onMeasure()
* onLayout()
* surfaceCreated()
* surfaceChanged()
* onMeasure()
* onLayout()
* onMeasure()
* @author stephan
*
*/
class Preview extends ViewGroup implements SurfaceHolder.Callback { //
private static final String TAG = "Preview";
SurfaceHolder mHolder; //
public Camera camera; //
private List supportedPreviewSizes;
private Size previewSize;
SurfaceView mSurfaceView;
CameraActivity cameraActivity;
int l2 = 0, t2 = 0, r2 = 0, b2 = 0;
int padding = 20;
Size optimalPreviewSize, optimalPictureSize;
// the size of this view. gets set in onMeasure()
int fullWidth, fullHeight;
public Preview(Context context) {
super(context);
init(context);
}
public Preview(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public Preview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
setKeepScreenOn(true);
cameraActivity = (CameraActivity) context;
mSurfaceView = new SurfaceView(context);
addView(mSurfaceView);
mHolder = mSurfaceView.getHolder(); //
mHolder.addCallback(this); //
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); //
}
...
public void openCamera() {
cameraActivity.log("openCamera()");
if (this.camera == null) {
cameraActivity.log("Camera.open()");
this.camera = Camera.open();
//supportedPreviewSizes = camera.getParameters().getSupportedPreviewSizes();
requestLayout(); // -> onMeassure() -> onLayout()
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
cameraActivity.log("onMeasure()");
// We purposely disregard child measurements because act as a
// wrapper to a SurfaceView that centers the camera preview instead
// of stretching it.
fullWidth = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
fullHeight = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(fullWidth, fullHeight);
if(this.camera != null){
cameraActivity.log("fullSize:"+fullWidth+"x"+fullHeight);
this.setCameraPreviewSize();
this.setCameraPictureSize();
}
}
private void calcScaledPreviewSize(){
...
}
...
private void setCameraPreviewSize() {
Camera.Parameters parameters = camera.getParameters();
if(parameters.getPreviewSize() != this.getOptimalPreviewSize()){
parameters.setPreviewSize(this.getOptimalPreviewSize().width, this.getOptimalPreviewSize().height);
this.camera.setParameters(parameters);
}
}
private void setCameraPictureSize() {
Camera.Parameters parameters = this.camera.getParameters();
if(parameters.getPictureSize() != this.getOptimalCameraPictureSize()){
parameters.setPictureSize(getOptimalCameraPictureSize().width, getOptimalCameraPictureSize().height);
this.camera.setParameters(parameters);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
cameraActivity.log("onLayout()");
if (changed && getChildCount() > 0 && this.camera != null) {
final View child = getChildAt(0);
cameraActivity.log("r:"+this.getPreviewRight()+" l:"+this.getPreviewLeft()+" b:"+this.getPreviewBottom()+" t:"+this.getPreviewTop());
child.layout(this.getPreviewLeft(), this.getPreviewTop(), this.getPreviewRight(), this.getPreviewBottom());
cameraActivity.initOverlay(this.getPreviewLeft(),this.getPreviewTop(),this.getPreviewRight(),this.getPreviewBottom());
}
}
private Size getOptimalPreviewSize() {
if(optimalPreviewSize == null){
//calculate optimal preview size
}
return optimalPreviewSize;
}
private Size getOptimalCameraPictureSize() {
if(optimalPictureSize == null){
//calculate optimal image size
}
return optimalPictureSize;
}
// Called once the holder is ready
public void surfaceCreated(SurfaceHolder holder) { //
// The Surface has been created, acquire the camera and tell it where
// to draw.
cameraActivity.log("surfaceCreated()");
try {
if (this.camera != null) {
this.camera.setPreviewDisplay(holder);
}
} catch (IOException exception) {
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
cameraActivity.log("surfaceChanged()");
if (camera != null) {
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(getOptimalPreviewSize().width, getOptimalPreviewSize().height);
requestLayout();
camera.setParameters(parameters);
camera.startPreview();
}
}
public void surfaceDestroyed(SurfaceHolder holder) { //
cameraActivity.log("surfaceDestroyed()");
if(this.camera != null){
camera.stopPreview();
}
}
public void releaseCamera(){
cameraActivity.log("releaseCamera()");
if (camera != null) {
camera.stopPreview();
camera.setPreviewCallback(null);
camera.release();
camera = null;
}
}
}
This is how I fixed it 100%, finally (working on every device I tried it on, including Galaxy S):
I destroyed the camere preview object onResume and reinstantiated all together (like on startup). More details here:
android: I get no stacktrace, phone just hangs
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