Question

我设法让相机应用拍摄一张照片并使用MediaStore.ACTION_IMAGE_CAPTURE将其返回到活动中。

如何让相机拍摄多张照片并将其返回活动？

提前致谢

Answer 1

编辑：

我将尝试解释基本步骤。首先创建相机的视图（预览）：

/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;

public CameraPreview(Context context, Camera camera) {
    super(context);
    mCamera = camera;

    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mHolder = getHolder();
    mHolder.addCallback(this);
    // deprecated setting, but required on Android versions prior to 3.0
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

public void surfaceCreated(SurfaceHolder holder) {
    // The Surface has been created, now tell the camera where to draw the preview.
    try {
        mCamera.setPreviewDisplay(holder);
        mCamera.startPreview();
    } catch (IOException e) {
        Log.d(TAG, "Error setting camera preview: " + e.getMessage());
    }
}

public void surfaceDestroyed(SurfaceHolder holder) {
    // empty. Take care of releasing the Camera preview in your activity.
}

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    // If your preview can change or rotate, take care of those events here.
    // Make sure to stop the preview before resizing or reformatting it.

    if (mHolder.getSurface() == null){
      // preview surface does not exist
      return;
    }

    // stop preview before making changes
    try {
        mCamera.stopPreview();
    } catch (Exception e){
      // ignore: tried to stop a non-existent preview
    }

    // set preview size and make any resize, rotate or
    // reformatting changes here

    // start preview with new settings
    try {
        mCamera.setPreviewDisplay(mHolder);
        mCamera.startPreview();

    } catch (Exception e){
        Log.d(TAG, "Error starting camera preview: " + e.getMessage());
    }
}
}

现在，将您的活动布局更改为：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<FrameLayout
android:id="@+id/camera_preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
/>

<Button
android:id="@+id/button_capture"
android:text="Capture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
/>
</LinearLayout>

在您的清单中，将此行添加到您的活动中：

android:screenOrientation="landscape">

现在，在您的活动中，使用以下命令更改您的onCreate：

private Camera mCamera;
private CameraPreview mPreview;

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

    // Create an instance of Camera
    mCamera = getCameraInstance();

    // Create our Preview view and set it as the content of our activity.
    mPreview = new CameraPreview(this, mCamera);
    FrameLayout preview = (FrameLayout)   findViewById(R.id.camera_preview);
    preview.addView(mPreview);
}

定义图片回调以便以JPEG格式接收照片：

private PictureCallback mPicture = new PictureCallback() {

@Override
public void onPictureTaken(byte[] data, Camera camera) {

    File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
    if (pictureFile == null){
        Log.d(TAG, "Error creating media file, check storage permissions: " +
            e.getMessage());
        return;
    }

    try {
        FileOutputStream fos = new FileOutputStream(pictureFile);
        fos.write(data);
        fos.close();
    } catch (FileNotFoundException e) {
        Log.d(TAG, "File not found: " + e.getMessage());
    } catch (IOException e) {
        Log.d(TAG, "Error accessing file: " + e.getMessage());
    }
}
};

现在，如果您想拍照，请调用此方法您需要多长时间（注意相机的释放可能）

mCamera.takePicture(null, null, mPicture);

P.S：不推荐使用相机，如果需要，请尝试使用Camera2

有关所有信息，请查看：https://developer.android.com/guide/topics/media/camera.html

Answer 2

Intent无法完成如果你想拍摄多张照片然后将它们全部返回到你的应用程序，你必须自己写一个相机活动。

如何让相机应用程序拍摄多张照片

2 个答案: