我想请用户从相机或设备中的现有图片(图库或其他)中拍照。我该怎么做？

我已经实现了下面的解决方案，它似乎工作正常，但文档非常困惑，所以我想知道是否有更好的解决方案。

此外，请查看此相关帖子。在那里您将看到如何获取图像路径或位图:Get/pick an image from Android's built-in Gallery app programmatically

因此，在我的解决方案中，您将创建一个 TakePictureHelper 对象并执行以下操作。

假设您显示一个对话框，用户可以在其中选择“相机”或“其他”。当用户选择一个选项时，您将调用 takeFromCamera() 或 takeFromOther()。当拍照(或不拍照)时，onActivityResult() 方法将被调用。在那里您可以调用 retrievePicture，它将返回图片的 Uri，如果没有拍摄照片则返回 null。

请让我知道您的想法、分享想法或如果我不清楚可以问我任何问题。

非常感谢!

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

public class TakePictureHelper {

    public final static int REQUEST_CAMERA = 1;
    public final static int REQUEST_OTHER = 2;

    private Uri cameraImageUri;

    /**
     * Request picture from camera using the given title
     */
    public void takeFromCamera(Activity activity, String title)
    {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        File cameraImageOutputFile = new File(
                Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                createCameraImageFileName());
        cameraImageUri = Uri.fromFile(cameraImageOutputFile);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, cameraImageUri);
        activity.startActivityForResult(Intent.createChooser(intent, title), REQUEST_CAMERA);
    }

    /**
     * Request picture from any app (gallery or whatever) using the given title
     */
    public void takeFromOther(Activity activity, String title)
    {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        activity.startActivityForResult(Intent.createChooser(intent, title), REQUEST_OTHER);
    }

    /**
     * Retrieve the picture, taken from camera or gallery.
     *
     * @return the picture Uri, or null if no picture was taken.
     */
    public Uri retrievePicture(Activity activity, int requestCode, int resultCode, Intent data)
    {
        Uri result = null;

        if (resultCode == Activity.RESULT_OK) {

            if (requestCode == REQUEST_OTHER) {
                result = data.getData();
            } else if (requestCode == REQUEST_CAMERA) {
                result = cameraImageUri;
            }
        }

        return result;
    }

    private String createCameraImageFileName() {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        return timeStamp + ".jpg";
    }
}

最佳答案

根据@yurezcv 的回答，这是我想出的(最重要的是如何在 onActivityResult 中检索图像):

private List<File> cameraImageFiles;

private void popImageChooser(){
    // Camera.
    final List<Intent> cameraIntents = new ArrayList<Intent>();
    final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    final PackageManager packageManager = getPackageManager();
    final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);

    cameraImageFiles = new ArrayList<File>();

    int i=0;
    for(ResolveInfo res : listCam) {
        final String packageName = res.activityInfo.packageName;
        final Intent intent = new Intent(captureIntent);
        intent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
        intent.setPackage(packageName);
        intent.putExtra(MediaStore.MEDIA_IGNORE_FILENAME, ".nomedia");

        File cameraImageOutputFile = new File(
                Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                createCameraImageFileName());
        cameraImageFiles.add(cameraImageOutputFile);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(cameraImageFiles.get(i)));
        i++;

        cameraIntents.add(intent);
    }

    // Filesystem.
    final Intent galleryIntent = new Intent();
    galleryIntent.setType("image/*");
    galleryIntent.setAction(Intent.ACTION_GET_CONTENT);

    // Chooser of filesystem options.
    final Intent chooserIntent = Intent.createChooser(galleryIntent, getString(R.string.attach_images_title));

    // Add the camera options.
    chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
    startActivityForResult(chooserIntent, ACTIVITY_REQUEST_CODE_IMAGE);
}


protected void onActivityResult(int requestCode, int resultCode, 
           Intent imageReturnedIntent) {
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent); 

    switch(requestCode) { 
    case ACTIVITY_REQUEST_CODE_IMAGE:
        if(resultCode == RESULT_OK){

            Uri uri = null;
            if(imageReturnedIntent == null){   //since we used EXTRA_OUTPUT for camera, so it will be null

                for(int i=0;i<cameraImageFiles.size();i++){
                    if(cameraImageFiles.get(i).exists()){
                        uri = Uri.fromFile(cameraImageFiles.get(i));
                        break;
                    }
                }
                Log.d("attachimage", "from camera: "+uri);
            }
            else {  // from gallery
                uri = imageReturnedIntent.getData();
                Log.d("attachimage", "from gallery: "+uri.toString());
            }

            if(uri != null){
                attachImage(uri);
            }
        }
    }
}

关于Android - 如何从相机或画廊拍照，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20021431/