致命异常 - 在 Camera.release() 被称为 HTC ONE M9 之后正在使用相机
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【中文标题】致命异常 - 在 Camera.release() 被称为 HTC ONE M9 之后正在使用相机【英文标题】：Fatal Exception - Camera is being used after Camera.release() was called HTC ONE M9 【发布时间】：2016-12-06 13:41:19 【问题描述】：我正在检查我的 surfaceView 项目是否运行良好，因此我在我的妻子 Galaxy s7 G930F 上进行了尝试，它运行良好，当我尝试在我的 HTC ONE M9 上运行时它甚至没有完全移动，一直在崩溃。这是一个奇怪的问题，这两款手机都在 android 6 上运行。在尝试运行时，我附上了一个日志：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.arturs.androidmirrorapplicationv2, PID: 15974
java.lang.RuntimeException: Camera is being used after Camera.release() was called
at android.hardware.Camera.setPreviewSurface(Native Method)
at android.hardware.Camera.setPreviewDisplay(Camera.java:923)
at com.example.arturs.androidmirrorapplicationv2.CameraView.surfaceCreated(CameraView.java:46)
at android.view.SurfaceView.updateWindow(SurfaceView.java:582)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:177)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2152)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1174)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6241)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:873)
at android.view.Choreographer.doCallbacks(Choreographer.java:676)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:859)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:168)
Disconnected from the target VM, address: 'localhost:8602', transport: 'socket'
at android.app.ActivityThread.main(ActivityThread.java:5845)
at java.lang.reflect.Method.invoke(Native Method)
我的其余代码与上面类似：MainActivity 类
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
public class MainActivity extends AppCompatActivity
private Camera mCamera;
private CameraView mCameraView;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
@Override
protected void onResume()
super.onResume();
try
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
//pyta użytkownika o autoryzację - potrzebne w androidzie => 6.0 tzw. run permission
ActivityCompat.requestPermissions(this, new String[]android.Manifest.permission.CAMERA, 50);
else
mCamera = openFrontFacingCamera();
mCameraView = new CameraView(this, mCamera);
setContentView(mCameraView);
catch (Exception e)
finish();
@Override
protected void onPause()
if(mCamera != null)
mCamera.release();
mCamera = null;
super.onPause();
public Camera openFrontFacingCamera()
int cameraCount = 0;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for (int camIdx = 0; camIdx < cameraCount; camIdx++)
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
try
cam = Camera.open(camIdx);
catch (RuntimeException e)
Log.e(TAG, "Camera failed to open: " + e.getLocalizedMessage());
return cam;
CameraView 类
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Surface;
import android.view.Display;
import android.view.WindowManager;
import java.io.IOException;
import java.util.List;
public class CameraView extends SurfaceView implements SurfaceHolder.Callback
private Camera mCamera;
private View mView;
private WindowManager display;
private Context mContext;
private static final String cameraPreview = "CameraView";
private static final String APP_CLASS = "APP_CLASS";
private static final String Bug = "Bug";
public CameraView(Context context, Camera mCamera)
super(context);
mContext = context;
this.mCamera = mCamera;
mCamera.setDisplayOrientation(90);
SurfaceHolder holder = getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
@Override
public void surfaceCreated(SurfaceHolder holder)
try
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
catch (IOException e)
Log.e(cameraPreview, "The failure of the camera settings");
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
Camera.Parameters params = mCamera.getParameters();
List<Camera.Size> sizes = params.getSupportedPreviewSizes();
Camera.Size optionalSize = getOptimalPreviewSize(sizes, width, height);
params.setPreviewSize(optionalSize.width, optionalSize.height);
mCamera.setParameters(params);
boolean isPreviewRunning = true;
if (isPreviewRunning)
mCamera.stopPreview();
Parameters parameters = mCamera.getParameters();
Display display = ((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
width = display.getWidth();
height = display.getHeight();
if(display.getRotation() == Surface.ROTATION_0)
parameters.setPreviewSize(height, width);
mCamera.setDisplayOrientation(90);
if(display.getRotation() == Surface.ROTATION_90)
parameters.setPreviewSize(width, height);
mCamera.setDisplayOrientation(0);
if(display.getRotation() == Surface.ROTATION_180)
parameters.setPreviewSize(height, width);
mCamera.setDisplayOrientation(270);
if(display.getRotation() == Surface.ROTATION_270)
parameters.setPreviewSize(width, height);
mCamera.setDisplayOrientation(180);
try
mCamera.setParameters(parameters);
previewCamera(holder);
mCamera.startPreview();
catch(Exception e)
Log.e(Bug, "setting Parameters Failed" + e.getLocalizedMessage());
public void previewCamera(SurfaceHolder holder)
try
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
boolean isPreviewRunning = true;
catch(Exception e)
Log.d(APP_CLASS, "Cannot start preview", e);
@Override
public void surfaceDestroyed(SurfaceHolder holder)
mCamera.release();
mCamera = null;
private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h)
final double ASPECT_TOLERANCE = 0.1;
double targetRatio=(double)h / w;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes)
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff)
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
if (optimalSize == null)
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes)
if (Math.abs(size.height - targetHeight) < minDiff)
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
return optimalSize;
我会感谢所有可以引导我解决这个问题的建议。
【问题讨论】：
【参考方案1】：我已经想通了 :) 所以 MainActivity 类现在应该是这样的
package com.example.arturs.androidmirrorapplicationv2;
import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
public class MainActivity extends Activity
private CameraView mCameraView;
private Camera mCamera;
private static final String TAG = " => Main Activity: ";
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
mCamera = openFrontFacingCamera();
setContentView(R.layout.activity_main);
@Override
protected void onResume()
super.onResume();
//
// if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
// //pyta użytkownika o autoryzację - potrzebne w androidzie => 6.0 tzw. run permission
// ActivityCompat.requestPermissions(this, new String[]android.Manifest.permission.CAMERA, 50);
// else
Log.d(TAG, " -> OnResume");
try
mCamera = openFrontFacingCamera();
if (mCamera != null)
mCameraView = new CameraView(this, mCamera);
setContentView(mCameraView);
else
Log.d(TAG, " = Camera == NULL");
catch (Exception e)
e.printStackTrace();
finish();
Log.d(TAG, " <- OnResume");
@Override
protected void onPause()
Log.d(TAG, " -> onPause");
if(mCamera != null)
mCamera.release();
mCamera = null;
super.onPause();
Log.d(TAG, " <- onPause");
public Camera openFrontFacingCamera()
// if (mCamera != null)
// mCamera.release();
// mCamera = null;
int cameraCount = 0;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for (int camIdx = 0; camIdx < cameraCount; camIdx++)
Camera.getCameraInfo(camIdx, cameraInfo);
Log.d(TAG, "Camera Info: "+cameraInfo.facing);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
try
return Camera.open(camIdx);
catch (RuntimeException e)
Log.e(TAG, "Camera failed to open: " + e.getLocalizedMessage());
return null;
CameraView 类应该看起来像上面这个，更正
package com.example.arturs.androidmirrorapplicationv2;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Surface;
import android.view.Display;
import android.view.WindowManager;
import java.io.IOException;
import java.util.List;
public class CameraView extends SurfaceView implements SurfaceHolder.Callback
private Camera mCamera;
private View mView;
private WindowManager display;
private Context mContext;
private static final String cameraPreview = "CameraView";
private static final String APP_CLASS = "APP_CLASS";
private static final String Bug = "Bug";
public CameraView(Context context, Camera mCamera)
super(context);
mContext = context;
this.mCamera = mCamera;
mCamera.setDisplayOrientation(90);
SurfaceHolder holder = getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
@Override
public void surfaceCreated(SurfaceHolder holder)
try
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
catch (IOException e)
e.printStackTrace();
Log.e(cameraPreview, "The failure of the camera settings");
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
Camera.Parameters params = mCamera.getParameters();
List<Camera.Size> sizes = params.getSupportedPreviewSizes();
Camera.Size optionalSize = getOptimalPreviewSize(sizes, width, height);
params.setPreviewSize(optionalSize.width, optionalSize.height);
mCamera.setParameters(params);
Parameters parameters = mCamera.getParameters();
Display display = ((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0)
mCamera.setDisplayOrientation(90);
if(display.getRotation() == Surface.ROTATION_90)
mCamera.setDisplayOrientation(0);
if(display.getRotation() == Surface.ROTATION_180)
mCamera.setDisplayOrientation(270);
if(display.getRotation() == Surface.ROTATION_270)
mCamera.setDisplayOrientation(180);
try
mCamera.setParameters(parameters);
previewCamera(holder);
mCamera.startPreview();
catch(Exception e)
e.printStackTrace();
Log.e(Bug, "setting Parameters Failed" + e.getLocalizedMessage());
public void previewCamera(SurfaceHolder holder)
try
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
boolean isPreviewRunning = true;
catch(Exception e)
e.printStackTrace();
Log.d(APP_CLASS, "Cannot start preview", e);
@Override
public void surfaceDestroyed(SurfaceHolder holder)
mCamera.release();
mCamera = null;
private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h)
final double ASPECT_TOLERANCE = 0.1;
double targetRatio=(double)h / w;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes)
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff)
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
if (optimalSize == null)
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes)
if (Math.abs(size.height - targetHeight) < minDiff)
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
return optimalSize;
【讨论】：
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