如何采取从相机照片，而不用preVIEW我的应用程序启动时？ [英] How to take pictures from the camera without preview when my app starts?

问题描述

现在我要的是一个应用程序启动时，仅仅拍摄照片从相机。没有布局，没有摄像头preVIEW ......没什么，只是一个简单的应用程序图标来启动应用程序。一旦推出的相机应该拍照。

Now all I want is an app that just takes the picture from the camera upon launching. No layout, no camera preview...nothing, just a simple app icon to launch the app. Once launched the camera should take the picture.

下面是preVIEW图像，即我不希望出现在我的应用。我只是想我的应用程序eanble为点击图像合围拍照按钮这里：

Here is the preview image, that i do not want to appear in my app. I just want to eanble my app to click the take picture button encircled in the image here:

在拍摄照片然后，我需要将其保存在我的照片库。

Once the picture is taken then I need to save it in my photo gallery.

有人可以指导我在这里？谢谢

Can someone guide me here? Thanks

下面是我在模拟器和设备尝试了一些code。

Here is some code that I have tried on emulator and device.

import java.io.IOException;
import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;

public class Main extends Activity implements SurfaceHolder.Callback{

    private Camera camera;
     private ImageButton cameraClick;
     private SurfaceHolder mHolder; 

    /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      SurfaceView surfaceView = (SurfaceView)findViewById(R.id.surfaceView1);
      mHolder = surfaceView.getHolder();
      mHolder.addCallback(this);
      mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);  

      cameraClick = (ImageButton) findViewById(R.id.cameraClick);
      cameraClick.setOnClickListener( new OnClickListener() {
       public void onClick(View v)
       {
            camera.takePicture(shutterCallback, rawCallback,jpegCallback);
       }
      });  





      }

     // Handles when shutter open
     ShutterCallback shutterCallback = new ShutterCallback()
     {
      public void onShutter()
      {   

      }
     };

     /** Handles data for raw picture */
     PictureCallback rawCallback = new PictureCallback()
     {
      public void onPictureTaken(byte[] data, Camera camera)
      {   

      }
     }; 

     /** Handles data for jpeg picture */
     PictureCallback jpegCallback = new PictureCallback()
    {
      public void onPictureTaken(byte[] data, Camera camera)
    {
       // we do something using return byte[] of taken image.
      }
     };

     @Override
     public void surfaceChanged(SurfaceHolder holder,int format,int width,int height)
    {

      // Set camera preview size,orientation,rotation using parameters 

    Camera.Parameters parameters = camera.getParameters();
            parameters.set("orientation", "portrait");
            camera.setParameters(parameters);
             camera.startPreview();       

     }

     @Override
     public void surfaceCreated(SurfaceHolder holder)
    {
      camera = Camera.open();
             try {
        camera.setPreviewDisplay(holder);
       }
    catch (IOException e)
    {
        e.printStackTrace();
       }

     }

     @Override
     public void surfaceDestroyed(SurfaceHolder holder)
    {
      camera.stopPreview();
             camera.release();
            camera = null; 

     }

}

现在我能够听到按钮点击图片点击模拟器和设备两者。现在我想将图片保存为好。任何线索？

Now I am able to hear the picture click on the button click both on the emulator and the device. Now I want to save the picture as well. Any clue?

推荐答案

低于code使用。它的测试和为我工作。任何问题，请随时提出意见。

Use below code. Its Tested and Worked for me. Any issues please feel free to put comments.

private void takeSnapShots()
{
      Toast.makeText(getApplicationContext(), "Image snapshot   Started",Toast.LENGTH_SHORT).show();
     // here below "this" is activity context.  
 SurfaceView surface = new SurfaceView(this);
    Camera camera = Camera.open();
    try {
        camera.setPreviewDisplay(surface.getHolder());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    camera.startPreview();
    camera.takePicture(null,null,jpegCallback);
}


 /** picture call back */
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) 
{
    FileOutputStream outStream = null;
    try {
  String dir_path = "";// set your directory path here
        outStream = new FileOutputStream(dir_path+File.separator+image_name+no_pics+".jpg");    
        outStream.write(data);
        outStream.close();
        Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally 
    {
        camera.stopPreview();
        camera.release();
        camera = null;
        Toast.makeText(getApplicationContext(), "Image snapshot Done",Toast.LENGTH_LONG).show();


    }
    Log.d(TAG, "onPictureTaken - jpeg");
}
};

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