Android：“Camera.takePicture failed”例外 [英] Android: "Camera.takePicture failed" Exception

问题描述

我遇到一个奇怪的问题。我在HTC EVO上进行测试。我已经编写了面向2.2的演示相机应用程序，几乎所有功能都正常工作问题是，在拍摄三张或四张照片后，应用程序崩溃，并给我以下消息：

  D / QualcommCameraHardware（64 ）：takePicture（479）
 D / QualcommCameraHardware（64）val_ril_status = 0 val_wimax_status = 0 val_low_temp_limit = QualcommCameraHardware（64）：FLASHLIGHT is ENABLED 
 D / QualcommCameraHardware（64）：stopPreviewInternal E：1 
 D / QualcommCameraHardware（64）：cancelAutoFocusInternal E 
 D / QualcommCameraHardware（64）：cancelAutoFocusInternal X： 0 
 I / QualcommCameraHardware（64）：deinitPreview E 
 D / QualcommCameraHardware（64）：launch_watchdog_thread：
 D / QualcommCameraHardware（64）：watchdog_thread_id = 369048 
 I / QualcommCameraHardware ）：register_buf：camfd = 35，reg = 1 buffer = 0x4153f000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 35，reg = 1 buff er = 0x415bf000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 35，reg = 1 buffer = 0x4163f000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 35，reg = 1 buffer = 0x416bf000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 38，reg = 1 buffer = 0x4331d000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 38，reg = 1 buffer = 0x4351d000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 38，reg = 1 buffer = 0x4371d000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 38，reg = 1 buffer = 0x4391d000 
 I / QualcommCameraHardware ）：register_buf：camfd = 38，reg = 1 buffer = 0x43b1d000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 38，reg = 1 buffer = 0x43d1d000 
 I / QualcommCameraHardware（64）：register_buf： camfd = 38，reg = 1 buffer = 0x43f1d000 
 I / QualcommCameraHardware（64）：register_buf：camfd = 38，reg = 1 buffer = 0x4411d000 
 I / QualcommCameraHardware（64）：deinitPreview X 
 D /第四纪lcommCameraHardware（64）：stopPreviewInternal X：0 
 D / QualcommCameraHardware（64）：initRaw E：raw size = 3264x2448 
 D / QualcommCameraHardware（64）：initRaw：raw ration = 0.750000，显示大小= 768x432 
 D / QualcommCameraHardware（64）：initRaw：thumbnail_width = 768，thumbnail_height = 576，thumbnail_buffer_size = 663552 
 D / QualcommCameraHardware（64）：native_access_parm：fd 24，type 1，length 32 
 D / mm-camera-ov8810_u（64）：andy cam_mode_sel 0 
 D / QualcommCameraHardware（64）：initRaw：初始化mRawHeap。 
 E / MemoryHeapBase（64）：打开/ dev / pmem_camera错误：没有这样的文件或目录
 E / QualcommCameraHardware（64）：无法为pmem pool / dev / pmem_camera构建主堆
 E / QualcommCameraHardware（64）：initRaw X使用pmem_camera失败，尝试使用pmem_adsp 
 D / QualcommCameraHardware（64）：frame_thread X 
 D / QualcommCameraHardware（64）：watchdog_thread_id = 369048 
 D / QualcommCameraHardware （64）：release_watchdog_thread：frame_thread_released = 1 
 E / MemoryHeapBase（64）：mmap（fd = 38，size = 11988992）失败（参数无效）
 E / QualcommCameraHardware（64）堆的pmem池/ dev / pmem_adsp 
 E / QualcommCameraHardware（64）：initRaw X：初始化错误mRawHeap 
 E / QualcommCameraHardware（64）：initRaw失败。不拍照
 D / AndroidRuntime（2650）：关闭VM 
 W / dalvikvm（2650）：threadid = 1：线程退出与未捕获的异常（组= 0x400259f8）
 E / AndroidRuntime（2650）致命的例外：main 
 E / AndroidRuntime（2650）：java.lang.RuntimeException：takePicture failed 
 E / AndroidRuntime（2650）：at android.hardware.Camera.native_takePicture（Native Method）
 E / AndroidRuntime（2650）：在android.hardware.Camera.takePicture（Camera.java:535）
 E / AndroidRuntime（2650）：在android.hardware.Camera.takePicture（Camera.java:503）
 E / AndroidRuntime（2650）：at spikes.cameraSpike03.MainActivity.takePicture（MainActivity.java:90）
 E / AndroidRuntime（2650）：at spikes.cameraSpike03.MainActivity.access $ 3（MainActivity.java:87 ）
 E / AndroidRuntime（2650）：at spikes.cameraSpike03.MainActivity $ 3.onClick（MainActivity.java:80）
 E / AndroidRuntime（2650）：at android.view.View.performClick（View。 java：2408）
 E / AndroidRuntime（2650）：在android.view.View $ PerformClick.run（View.java:881 7）
 E / AndroidRuntime（2650）：在android.os.Handler.handleCallback（Handler.java:587）
 E / AndroidRuntime（2650）：在android.os.Handler.dispatchMessage（Handler。 java：92）
 E / AndroidRuntime（2650）：android.os.Looper.loop（Looper.java:144）
 E / AndroidRuntime（2650）：在android.app.ActivityThread.main ActivityThread.java:4937）
 E / AndroidRuntime（2650）：java.lang.reflect.Method.invokeNative（Native Method）
 E / AndroidRuntime（2650）：在java.lang.reflect.Method .invoke（Method.java:521）
 E / AndroidRuntime（2650）：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:868）
 E / AndroidRuntime（2650 ）：at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:626）
 E / AndroidRuntime（2650）：at dalvik.system.NativeStart.main（Native Method）
 W / ActivityManager（107）：强制整理活动spikes.cameraSpike03 / .MainActivity 
 D / QualcommCameraHardware（64）：void *看门狗（void *），frame_thread_released = 1，cnt = 0 
 D / commCameraHardware（64）：void * watchdog（void *），exit，frame_thread_released = 1 
 D / QualcommCameraHardware（64）：void release_watchdog_thread（）：pthread_join在看门狗成功。 
  

这可能是内存管理问题吗？

以下是我使用的所有代码。

[AndroidManifest.xml]

 <？xml version =1.0encoding =utf-8？> 
< manifest xmlns：android =http://schemas.android.com/apk/res/android
 package =spikes.cameraSpike03
 android：versionCode =1 
 android：versionName =1.0> 
< application android：icon =@ drawable / iconandroid：label =@ string / app_nameandroid：debuggable =true> 
< activity android：name =。MainActivityandroid：label =@ string / app_nameandroid：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 =8/> 
 
< uses-permission android：name =android.permission.CAMERA/> 
 
< uses-feature android：name =android.hardware.camera/> 
< uses-feature android：name =android.hardware.camera.autofocus/> 
< uses-feature android：name =android.hardware.camera.flash/> 
< / manifest> 
  

[main.xml]

 <？xml version =1.0encoding =utf-8？> 
< RelativeLayout xmlns：android =http://schemas.android.com/apk/res/androidandroid：orientation =verticalandroid：layout_width =fill_parentandroid：layout_height =fill_parent> ; 
< SurfaceView android：id =@ + id / svCameraViewandroid：layout_width =fill_parentandroid：layout_height =fill_parent/> 
< LinearLayout android：layout_width =fill_parentandroid：layout_height =wrap_contentandroid：orientation =horizo​​ntalandroid：background =＃3000android：layout_alignParentBottom =trueandroid：layout_centerHorizo​​ntal =true机器人：重力= CENTER_HORIZONTAL > 
< Button android：id =@ + id / btnCaptureandroid：layout_width =wrap_contentandroid：layout_height =wrap_contentandroid：text =capture/> 
< CheckBox android：id =@ + id / chkAutofocusandroid：layout_width =wrap_contentandroid：layout_height =wrap_contentandroid：text =Autofocus/> 
< / LinearLayout> 
< / RelativeLayout> 
  

[MainActivity.java]

  package spikes.cameraSpike03; 
 
 import java.util.List; 
 
 import android.app.Activity; 
 import android.content.pm.ActivityInfo; 
 import android.content.res.Configuration; 
 import android.graphics.PixelFormat; 
 import android.hardware.Camera; 
 import android.hardware.Camera.AutoFocusCallback; 
 import android.hardware.Camera.Parameters; 
 import android.hardware.Camera.PictureCallback; 
 import android.hardware.Camera.ShutterCallback; 
 import android.hardware.Camera.Size; 
 import android.os.Bundle; 
 import android.util.Log; 
 import android.view.SurfaceHolder; 
 import android.view.SurfaceView; 
 import android.view.View; 
 import android.view.Window; 
 import android.view.WindowManager; 
 import android.view.View.OnClickListener; 
 import android.widget.Button; 
 import android.widget.CheckBox; 
 
 public class MainActivity extends Activity implements SurfaceHolder.Callback {
 private static final String LOG_TAG = MainActivity.class.getName（）; 
 private static final String LOG_LINE =---------------------------------; 
 
私人相机_camera; 
 private boolean _previewIsRunning = false; 
 
私人SurfaceView _svCameraView; 
 private SurfaceHolder _surfaceHolder; 
 private Button _btnCapture; 
 private CheckBox _chkAutofocus; 
 
 @Override 
 public void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 
 getWindow（）。setFormat（PixelFormat.TRANSLUCENT）; 
 requestWindowFeature（Window.FEATURE_NO_TITLE）; 
 getWindow（）。setFlags（WindowManager.LayoutParams.FLAG_FULLSCREEN，WindowManager.LayoutParams.FLAG_FULLSCREEN）; 
 
 setContentView（R.layout.main）; 
 
 _svCameraView =（SurfaceView）findViewById（R.id.svCameraView）; 
 
 _surfaceHolder = _svCameraView.getHolder（）; 
 _surfaceHolder.addCallback（this）; 
 _surfaceHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）; 
 
 _chkAutofocus =（CheckBox）findViewById（R.id.chkAutofocus）; 
 
 _btnCapture =（Button）findViewById（R.id.btnCapture）; 
 _btnCapture.setOnClickListener（new OnClickListener（）{
 @Override 
 public void onClick（View v）{
 if（_camera！= null）{
 //决定是否使用自动对焦
如果（_chkAutofocus.isChecked（））{
 Log.d（LOG_TAG，LOG_LINE +准备使用自动对焦...）; 
 
 _camera.autoFocus（new AutoFocusCallback（）{
 @Override 
 public void onAutoFocus（boolean success，Camera camera）{
 Log.d（LOG_TAG，LOG_LINE +_camera.autoFocus。 onAutoFocus（...）输入。）; 
 
 takePicture（）; 
 
 Log.d（LOG_TAG，LOG_LINE +_camera.autoFocus.onAutoFocus（...）完成）; 
} 
}）; 
} 
 else {
 Log.d（LOG_TAG，LOG_LINE +准备拍照而无自动对焦。）; 
 
 takePicture（）; 
} 
} 
} 
}）; 
} 
 
 private void takePicture（）{
 Log.d（LOG_TAG，LOG_LINE +takePicture（）entered））; 
 
 _camera.takePicture（_shutterCallback，null，_jpegCallback）; 
 _previewIsRunning = false; 
 
 Log.d（LOG_TAG，LOG_LINE +takePicture（）完成。）; 
} 
 
私人ShutterCallback _shutterCallback =新ShutterCallback（）{
 @Override 
 public void onShutter（）{
 Log.d（LOG_TAG，LOG_LINE + _shutterCallback.onShutter（）调用。）; 
} 
}; 
 
 private PictureCallback _jpegCallback = new PictureCallback（）{
 @Override 
 public void onPictureTaken（byte [] data，Camera camera）{
 Log.d（LOG_TAG， LOG_LINE +_jpegCallback.onPictureTaken（）调用）; 
 
 _camera.startPreview（）; 
 _previewIsRunning = true; 
} 
}; 
 
 @Override 
 public void surfaceChanged（SurfaceHolder holder，int format，int width，int height）{
 if（_previewIsRunning）{
 Log.d（LOG_TAG， LOG_LINE +关于停止预览...）; 
 
 _camera.stopPreview（）; 
 
 Log.d（LOG_TAG，LOG_LINE +停止预览）; 
} 
 
尝试{
 Log.d（LOG_TAG，LOG_LINE +关于设置摄像机参数...）; 
 
 Camera.Parameters参数= _camera.getParameters（）; 
 
 //获取最佳预览大小，以便在设置参数时不会出现异常
列表< Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes（）; 
 Size optimizationPreviewSize = CameraUtil.getOptimalPreviewSize（supportedPreviewSizes，width，height）; 
 
 parameters.setPreviewSize（optimalPreviewSize.width，optimalPreviewSize.height）; 
 parameters.setFocusMode（Parameters.FOCUS_MODE_AUTO）; 
 parameters.setFlashMode（Parameters.FLASH_MODE_AUTO）; 
 
 _camera.setDisplayOrientation（90）; 
 
 _camera.setParameters（parameters）; 
 
 _camera.setPreviewDisplay（holder）; 
 
 Log.d（LOG_TAG，LOG_LINE +完成设置摄像机参数）; 
} 
 catch（Exception ex）{
 ex.printStackTrace（）; 
 Log.e（LOG_TAG，ex.toString（））; 
} 
 
 Log.d（LOG_TAG，LOG_LINE +即将开始预览...）; 
 
 _camera.startPreview（）; 
 _previewIsRunning = true; 
 
 Log.d（LOG_TAG，LOG_LINE +开始预览）; 
} 
 
 @Override 
 public void surfaceCreated（SurfaceHolder holder）{
 _camera = Camera.open（）; 
} 
 
 @Override 
 public void surfaceDestroyed（SurfaceHolder holder）{
 Log.d（LOG_TAG，LOG_LINE +拆除相机，因为表面被破坏... ）; 
 
 _camera.stopPreview（）; 
 _previewIsRunning = false; 
 _camera.release（）; 
 
 Log.d（LOG_TAG，LOG_LINE +由于表面被破坏而完成拆卸相机）; 
} 
 
 @Override 
 public void onConfigurationChanged（Configuration newConfig）{
 Log.d（LOG_TAG，LOG_LINE +关于将请求方向设置为SCREEN_ORIENTATION_PORTRAIT ... ）; 
 
 setRequestedOrientation（ActivityInfo.SCREEN_ORIENTATION_PORTRAIT）; 
 
 Log.d（LOG_TAG，LOG_LINE +成功将请求方向设置为SCREEN_ORIENTATION_PORTRAIT）; 
} 
} 
  

[CameraUtil.java]

  package spikes.cameraSpike03; 
 
 import java.util.List; 
 
 import android.hardware.Camera.Size; 
 
 public class CameraUtil {
 private CameraUtil（）{} 
 
 / ** 
 *返回包含最佳预览大小尺寸的Size对象用于当前硬件。 
 *此代码基于以下位置：http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/CameraPreview.html 
 * 
 * @param supportedSizes 
 *表示此硬件支持的所有已知预览大小的Size对象列表。 
 * 
 * @param w 
 *表面宽度。 
 * 
 * @param h 
 *表面高度。 
 * 
 * @return 
 *返回一个Size对象，其中包含当前硬件的最佳预览大小的维度。 
 * / 
 public static Size getOptimalPreviewSize（List< Size> supportedSizes，int w，int h）{
 final double ASPECT_TOLERANCE = 0.05; 
 double targetRatio =（double）w / h; 
 if（supportedSizes == null）return null; 
 
大小optimalSize = null; 
 double minDiff = Double.MAX_VALUE; 
 
 int targetHeight = h; 
 
 //尝试找到尺寸匹配宽高比和尺寸
（尺寸大小：supportedSizes）{
 double ratio =（double）size.width / size.height; 
 if（Math.abs（ratio-targetRatio）> ASPECT_TOLERANCE）继续; 
 if（Math.abs（size.height  -  targetHeight）< minDiff）{
 optimalSize = size; 
 minDiff = Math.abs（size.height  -  targetHeight）; 
} 
} 
 
 //找不到匹配的宽高比，忽略要求
 if（optimalSize == null）{
 minDiff = Double.MAX_VALUE; 
 for（Size size：supportedSizes）{
 if（Math.abs（size.height  -  targetHeight）< minDiff）{
 optimalSize = size; 
 minDiff = Math.abs（size.height  -  targetHeight）; 
} 
} 
} 
 return optimizeSize; 
} 
} 
  

任何建议将不胜感激。

谢谢。

解决方案

我也有类似的问题。后来我发现startPreview非常重要。

_camera.startPreview（）在takePicutre检出点之前非常重要5和6在这个链接。

http://developer.android.com/reference/android/hardware/Camera.html

I'm experiencing an odd problem. I'm doing my testing on an HTC EVO. I have written a demo camera application targeting 2.2 and almost everything works correctly. The problem is that after taking three or four pictures, the application crashes and gives me the following messages:

D/QualcommCameraHardware(   64): takePicture(479)
D/QualcommCameraHardware(   64): val_ril_status = 0,val_wimax_status = 0,val_hotspot_status = 0,val_low_temp_limit = 10.000000,val_batt_temp = 29.799999,val_low_temp_limit = 15,val_batt_cap  = 96
D/QualcommCameraHardware(   64): FLASHLIGHT is ENABLED
D/QualcommCameraHardware(   64): stopPreviewInternal E: 1
D/QualcommCameraHardware(   64): cancelAutoFocusInternal E
D/QualcommCameraHardware(   64): cancelAutoFocusInternal X: 0
I/QualcommCameraHardware(   64): deinitPreview E
D/QualcommCameraHardware(   64): launch_watchdog_thread:
D/QualcommCameraHardware(   64): watchdog_thread_id = 369048
I/QualcommCameraHardware(   64): register_buf: camfd = 35, reg = 1 buffer = 0x4153f000
I/QualcommCameraHardware(   64): register_buf: camfd = 35, reg = 1 buffer = 0x415bf000
I/QualcommCameraHardware(   64): register_buf: camfd = 35, reg = 1 buffer = 0x4163f000
I/QualcommCameraHardware(   64): register_buf: camfd = 35, reg = 1 buffer = 0x416bf000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x4331d000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x4351d000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x4371d000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x4391d000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x43b1d000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x43d1d000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x43f1d000
I/QualcommCameraHardware(   64): register_buf: camfd = 38, reg = 1 buffer = 0x4411d000
I/QualcommCameraHardware(   64): deinitPreview X
D/QualcommCameraHardware(   64): stopPreviewInternal X: 0
D/QualcommCameraHardware(   64): initRaw E: raw size=3264x2448
D/QualcommCameraHardware(   64): initRaw: raw ration = 0.750000, display size=768x432
D/QualcommCameraHardware(   64): initRaw: thumbnail_width=768, thumbnail_height=576, thumbnail_buffer_size=663552
D/QualcommCameraHardware(   64): native_access_parm: fd 24, type 1, length 32
D/mm-camera-ov8810_u(   64): andy cam_mode_sel 0
D/QualcommCameraHardware(   64): initRaw: initializing mRawHeap.
E/MemoryHeapBase(   64): error opening /dev/pmem_camera: No such file or directory
E/QualcommCameraHardware(   64): failed to construct master heap for pmem pool /dev/pmem_camera
E/QualcommCameraHardware(   64): initRaw X failed with pmem_camera, trying with pmem_adsp
D/QualcommCameraHardware(   64): frame_thread X
D/QualcommCameraHardware(   64): watchdog_thread_id = 369048
D/QualcommCameraHardware(   64): release_watchdog_thread: frame_thread_released = 1
E/MemoryHeapBase(   64): mmap(fd=38, size=11988992) failed (Invalid argument)
E/QualcommCameraHardware(   64): failed to construct master heap for pmem pool /dev/pmem_adsp
E/QualcommCameraHardware(   64): initRaw X: error initializing mRawHeap
E/QualcommCameraHardware(   64): initRaw failed.  Not taking picture.
D/AndroidRuntime( 2650): Shutting down VM
W/dalvikvm( 2650): threadid=1: thread exiting with uncaught exception (group=0x400259f8)
E/AndroidRuntime( 2650): FATAL EXCEPTION: main
E/AndroidRuntime( 2650): java.lang.RuntimeException: takePicture failed
E/AndroidRuntime( 2650):  at android.hardware.Camera.native_takePicture(Native Method)
E/AndroidRuntime( 2650):  at android.hardware.Camera.takePicture(Camera.java:535)
E/AndroidRuntime( 2650):  at android.hardware.Camera.takePicture(Camera.java:503)
E/AndroidRuntime( 2650):  at spikes.cameraSpike03.MainActivity.takePicture(MainActivity.java:90)
E/AndroidRuntime( 2650):  at spikes.cameraSpike03.MainActivity.access$3(MainActivity.java:87)
E/AndroidRuntime( 2650):  at spikes.cameraSpike03.MainActivity$3.onClick(MainActivity.java:80)
E/AndroidRuntime( 2650):  at android.view.View.performClick(View.java:2408)
E/AndroidRuntime( 2650):  at android.view.View$PerformClick.run(View.java:8817)
E/AndroidRuntime( 2650):  at android.os.Handler.handleCallback(Handler.java:587)
E/AndroidRuntime( 2650):  at android.os.Handler.dispatchMessage(Handler.java:92)
E/AndroidRuntime( 2650):  at android.os.Looper.loop(Looper.java:144)
E/AndroidRuntime( 2650):  at android.app.ActivityThread.main(ActivityThread.java:4937)
E/AndroidRuntime( 2650):  at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 2650):  at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 2650):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime( 2650):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime( 2650):  at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager(  107):   Force finishing activity spikes.cameraSpike03/.MainActivity
D/QualcommCameraHardware(   64): void* watchdog(void*), frame_thread_released = 1, cnt = 0
D/QualcommCameraHardware(   64): void* watchdog(void*), exit, frame_thread_released=1
D/QualcommCameraHardware(   64): void release_watchdog_thread(): pthread_join succeeded on watchdog.

Could this be a memory management problem?

Below is all the code I'm using.

[AndroidManifest.xml]

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="spikes.cameraSpike03"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">
        <activity android:name=".MainActivity" 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="8" />

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

 <uses-feature android:name="android.hardware.camera" />
 <uses-feature android:name="android.hardware.camera.autofocus" />
 <uses-feature android:name="android.hardware.camera.flash" />
</manifest>

[main.xml]

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">
 <SurfaceView android:id="@+id/svCameraView" android:layout_width="fill_parent" android:layout_height="fill_parent" />
 <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:background="#3000" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:gravity="center_horizontal">
  <Button android:id="@+id/btnCapture" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="capture" />
  <CheckBox android:id="@+id/chkAutofocus" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Autofocus" />
 </LinearLayout>
</RelativeLayout>

[MainActivity.java]

package spikes.cameraSpike03;

import java.util.List;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;

public class MainActivity extends Activity implements SurfaceHolder.Callback {
 private static final String LOG_TAG = MainActivity.class.getName();
 private static final String LOG_LINE = "---------------------------------";

 private Camera _camera;
 private boolean _previewIsRunning = false;

 private SurfaceView _svCameraView;
 private SurfaceHolder _surfaceHolder;
 private Button _btnCapture;
 private CheckBox _chkAutofocus;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getWindow().setFormat(PixelFormat.TRANSLUCENT);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.main);

        _svCameraView = (SurfaceView)findViewById(R.id.svCameraView);

        _surfaceHolder = _svCameraView.getHolder();
        _surfaceHolder.addCallback(this);
        _surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        _chkAutofocus = (CheckBox)findViewById(R.id.chkAutofocus);

        _btnCapture = (Button)findViewById(R.id.btnCapture);
        _btnCapture.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    if(_camera != null){
     //Decide whether or not to use autofocus
     if(_chkAutofocus.isChecked()){
      Log.d(LOG_TAG, LOG_LINE + "Preparing to take the picture using autofocus...");

      _camera.autoFocus(new AutoFocusCallback() {
       @Override
       public void onAutoFocus(boolean success, Camera camera) {
        Log.d(LOG_TAG, LOG_LINE + "_camera.autoFocus.onAutoFocus(...) entered.");

        takePicture();

        Log.d(LOG_TAG, LOG_LINE + "_camera.autoFocus.onAutoFocus(...) finished.");
       }
      });
     }
     else{
      Log.d(LOG_TAG, LOG_LINE + "Preparing to take the picture without autofocus...");

      takePicture();
     }
    }
   }
  });
    }

    private void takePicture(){
     Log.d(LOG_TAG, LOG_LINE + "takePicture() entered.");

     _camera.takePicture(_shutterCallback, null, _jpegCallback);
  _previewIsRunning = false;

  Log.d(LOG_TAG, LOG_LINE + "takePicture() finished.");
    }

    private ShutterCallback _shutterCallback = new ShutterCallback() {
  @Override
  public void onShutter() {
   Log.d(LOG_TAG, LOG_LINE + "_shutterCallback.onShutter() called.");
  }
 };

 private PictureCallback _jpegCallback = new PictureCallback() {
  @Override
  public void onPictureTaken(byte[] data, Camera camera) {
   Log.d(LOG_TAG, LOG_LINE + "_jpegCallback.onPictureTaken() called.");

   _camera.startPreview();
   _previewIsRunning = true;
  }
 };

 @Override
 public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
  if(_previewIsRunning){
   Log.d(LOG_TAG, LOG_LINE + "About to stop preview...");

   _camera.stopPreview();

   Log.d(LOG_TAG, LOG_LINE + "Stopped preview.");
  }

  try{
   Log.d(LOG_TAG, LOG_LINE + "About to set up camera parameters...");

   Camera.Parameters parameters = _camera.getParameters();

   //Get the optimal preview size so we don't get an exception when setting the parameters 
   List<Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes();
   Size optimalPreviewSize = CameraUtil.getOptimalPreviewSize(supportedPreviewSizes, width, height);

   parameters.setPreviewSize(optimalPreviewSize.width, optimalPreviewSize.height);
   parameters.setFocusMode(Parameters.FOCUS_MODE_AUTO);
   parameters.setFlashMode(Parameters.FLASH_MODE_AUTO);

   _camera.setDisplayOrientation(90);

   _camera.setParameters(parameters);

   _camera.setPreviewDisplay(holder);

   Log.d(LOG_TAG, LOG_LINE + "Finished setting up camera parameters.");
  }
  catch(Exception ex){
   ex.printStackTrace();
   Log.e(LOG_TAG, ex.toString());
  }

  Log.d(LOG_TAG, LOG_LINE + "About to start preview...");

  _camera.startPreview();
  _previewIsRunning = true;

  Log.d(LOG_TAG, LOG_LINE + "Started preview.");
 }

 @Override
 public void surfaceCreated(SurfaceHolder holder) {
  _camera = Camera.open();
 }

 @Override
 public void surfaceDestroyed(SurfaceHolder holder) {
  Log.d(LOG_TAG, LOG_LINE + "Tearing down camera because surface was destroyed...");

  _camera.stopPreview();
  _previewIsRunning = false;
  _camera.release();

  Log.d(LOG_TAG, LOG_LINE + "Finished tearing down camera because surface was destroyed.");
 }

 @Override
 public void onConfigurationChanged(Configuration newConfig){
  Log.d(LOG_TAG, LOG_LINE + "About to set request orientation to SCREEN_ORIENTATION_PORTRAIT...");

  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

  Log.d(LOG_TAG, LOG_LINE + "Successfully set request orientation to SCREEN_ORIENTATION_PORTRAIT.");
 }
}

[CameraUtil.java]

package spikes.cameraSpike03;

import java.util.List;

import android.hardware.Camera.Size;

public class CameraUtil {
 private CameraUtil(){}

 /**
  * Returns a Size object containing the dimensions for an optimal preview size for the current hardware.
  * This code is based on that found at: http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/CameraPreview.html
  * 
  * @param supportedSizes
  * A list of Size objects representing all the known preview sizes supported by this hardware.
  * 
  * @param w
  * The surface width.
  * 
  * @param h
  * The surface height.
  * 
  * @return
  * Returns a Size object containing the dimensions for an optimal preview size for the current hardware.
  */
 public static Size getOptimalPreviewSize(List<Size> supportedSizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.05;
        double targetRatio = (double) w / h;
        if (supportedSizes == null) return null;

        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        // Try to find an size match aspect ratio and size
        for (Size size : supportedSizes) {
            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);
            }
        }

        // Cannot find the one match the aspect ratio, ignore the requirement
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : supportedSizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }
}

Any suggestions would be greatly appreciated.

Thank you.

解决方案

I also had the similar issue. later i found startPreview is very important.

_camera.startPreview() is very important before the takePicutre checkout the point 5 and 6 in this link.

http://developer.android.com/reference/android/hardware/Camera.html

这篇关于Android：“Camera.takePicture failed”例外的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！