背部照相機android不工作

我有一個問題。我想從執行示例應用程序http://www.vogella.com/articles/AndroidCamera/article.html 它的工作原理。但當代碼CAMERA_FACING_FRONT變化CAMERA_FACING_BACK我看到的logcat：相機錯誤-1背部照相機android不工作

我執行它在我的三星Galaxy SII

private int findFrontFacingCamera() { 
int cameraId = -1; 
// Search for the front facing camera 
int numberOfCameras = Camera.getNumberOfCameras(); 
for (int i = 0; i < numberOfCameras; i++) { 
    CameraInfo info = new CameraInfo(); 
    Camera.getCameraInfo(i, info); 
    if (info.facing == CameraInfo.CAMERA_FACING_FRONT) { 
    Log.d(DEBUG_TAG, "Camera found"); 
    cameraId = i; 
    break; 
    } 
} 
return cameraId;

}

當前代碼

private int findFrontFacingCamera() { 
    int cameraId = -1; 
    // Search for the front facing camera 
    int numberOfCameras = Camera.getNumberOfCameras(); 
    for (int i = 0; i < numberOfCameras; i++) { 
     CameraInfo info = new CameraInfo(); 
     Camera.getCameraInfo(i, info); 
     if (info.facing == CameraInfo.CAMERA_FACING_BACK) { 
     Log.d(DEBUG_TAG, "Camera found " + info.facing); 
     cameraId = i; 
     break; 
     } 
    } 
    return cameraId; 
    }

logCat：

04-30 21:14:36.400: D/MakePhotoActivity(8793): Camera found 0 
04-30 21:14:36.400: I/Camera(8793): sendBroadcast intent.stop.app-in-app 
04-30 21:14:36.650: D/libEGL(8793): loaded /system/lib/egl/libEGL_mali.so 
04-30 21:14:36.655: D/libEGL(8793): loaded /system/lib/egl/libGLESv1_CM_mali.so 
04-30 21:14:36.660: D/libEGL(8793): loaded /system/lib/egl/libGLESv2_mali.so 
04-30 21:14:36.665: D/(8793): Device driver API match 
04-30 21:14:36.665: D/(8793): Device driver API version: 10 
04-30 21:14:36.665: D/(8793): User space API version: 10 
04-30 21:14:36.665: D/(8793): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Thu Oct 25 08:43:05 KST 2012 
04-30 21:14:36.685: D/OpenGLRenderer(8793): Enabling debug mode 0 
04-30 21:16:21.695: D/dalvikvm(8793): WAIT_FOR_CONCURRENT_GC blocked 0ms 
04-30 21:16:21.775: D/dalvikvm(8793): GC_EXPLICIT freed 78K, 14% free 9467K/10883K, paused 9ms+4ms, total 82ms 
04-30 21:16:22.010: E/Camera(8793): Error -1

其餘的代碼

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    // do we have a camera? 
    if (!getPackageManager() 
     .hasSystemFeature(PackageManager.FEATURE_CAMERA)) { 
     Toast.makeText(this, "No camera on this device", Toast.LENGTH_LONG) 
      .show(); 
    } else { 
     cameraId = findFrontFacingCamera(); 
     if (cameraId < 0) { 
     Toast.makeText(this, "No front facing camera found.", 
      Toast.LENGTH_LONG).show(); 
     } else { 
     camera = Camera.open(cameraId); 
     } 
    } 
    } 

    public void onClick(View view) { 

    camera.takePicture(null, null, 
     new PhotoHandler(getApplicationContext())); 
    }

權限：

<uses-permission android:name="android.permission.CAMERA"/> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
    <uses-feature android:name="android.hardware.camera" /> 
    <uses-permission android:name="android.permission.FLASHLIGHT"/> 
    <uses-feature android:name="android.hardware.camera.autofocus" />

來源

2013-04-30 user2337114

是否找到「找到相機」？你可以嘗試登錄numberOfCameras？ – pt2121 2013-04-30 19:04:27

我建議增加一些日誌中顯示的info.facing和CameraInfo.CAMERA_FACING_FRONT值。 CAMERA_FACING_BACK的值爲0和CAMERA_FACING_FRONT = 1。檢查info.facing中的值，這是設備返回的值

如果您正在訪問背光攝像頭，則可以嘗試使用 camera = Camera.open();。

可能存在硬件或設備權限原因，您爲什麼會收到運行時錯誤。

來源

2013-04-30 19:07:48 CocoNess

當前代碼：'private int findFrontFacingCamera（）{ int cameraId = -1; //搜索前置攝像頭 int numberOfCameras = Camera.getNumberOfCameras（）;對於（int i = 0; i user2337114 2013-04-30 19:15:12

日誌：04-30 21：14：36.400：D/MakePhotoActivity（8793）：找到相機0 – user2337114 2013-04-30 19:16:01

這意味着找到了後置相機。正如TanjaV所述，CAMERA_FACING_BACK的值爲0 – pt2121 2013-04-30 19:20:34

背部照相機android不工作

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