檢測拍照手機參數

Question

我已經創建了一個可行的辦法，所以我可以檢測哪些參數適合每個電話用一個簡單的列表。雖然現在當我運行它擊碎，

public void turnOn() {

在這條線：List<String> flashMods = params.getSupportedFlashModes();

    if (flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_AUTO)) { 

        params = mCamera.getParameters(); 
        params.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO); 
        mCamera.setParameters(params); 
        mCamera.startPreview(); 
        on = true; 
        Toast.makeText(getApplicationContext(), 
          "2", 
          Toast.LENGTH_SHORT).show(); 
        } 
        if(flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_ON)) { 

         params = mCamera.getParameters(); 
         params.setFlashMode(Camera.Parameters.FLASH_MODE_ON); 
         mCamera.setParameters(params); 
         mCamera.startPreview(); 
         on = true; 
        Toast.makeText(getApplicationContext(), 
          "3", 
          Toast.LENGTH_SHORT).show(); 
         } 
        if(flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_TORCH)) { 

         params = mCamera.getParameters(); 
         params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); 
         mCamera.setParameters(params); 
         mCamera.startPreview(); 
         on = true; 

        Toast.makeText(getApplicationContext(), 
          "4", 
          Toast.LENGTH_SHORT).show(); 
         } 
        if(flashMods.contains(android.hardware.Camera.Parameters.FLASH_MODE_RED_EYE)) { 

         params = mCamera.getParameters(); 
         params.setFlashMode(Camera.Parameters.FLASH_MODE_RED_EYE); 
         mCamera.setParameters(params); 
         mCamera.startPreview(); 
         on = true; 
        Toast.makeText(getApplicationContext(), 
          "5", 
          Toast.LENGTH_SHORT).show(); 
         } 
      } 

    } 

提前感謝！

Answer 1

是否啓用了許可 「CAMERA」？

你有沒有指定的params對象 - 它可能爲空。

我不喜歡這樣（在單/ C＃，而不是Java恐怕）：

private void SetUpCamera() 
    { 
     if (m_camera == null) 
      m_camera = Android.Hardware.Camera.Open(); 

     var holder = m_surface.Holder; 
     holder.AddCallback(this); 
     holder.SetType(Android.Views.SurfaceType.PushBuffers); 
     SetCameraDisplayOrientation(); 
     GetSurfaceSize(m_camera.GetParameters()); 
     GetFlashModes(m_camera.GetParameters()); 

    } 

則：

private void GetFlashModes(Android.Hardware.Camera.Parameters parameters) 
    { 
     IList<String> flashModes = parameters.SupportedFlashModes; 

     m_flashModes = new List<string>(); 

     if (flashModes == null)//not supported 
      return; 

     foreach (string mode in flashModes) 
      m_flashModes.Add(mode); 

     if (m_currentMode != null)//mode has been saved, need to set it to this mode 
      SetFlashMode(m_currentMode); 
     else 
      m_currentMode = GetFlashMode(); 
    }