使用 Android 相机拍照后开始新的活动

Question

我正在使用 Google PhotoIntentActivity 示例在我的应用中实现原生 Android 相机。 在此示例中，您单击主活动中的按钮（称为 PhotoIntentActivity），启动相机，拍摄照片，然后将照片显示在始终位于同一活动中的 ImageView 中。 我不想呆在那里，而是想启动一个意图并在新活动中可视化照片。

我无法理解照片在主要活动中再次传递的位置以及我应该在哪里/如何启动新意图。这是代码：

public class PhotoIntentActivity extends Activity {

    private static final int ACTION_TAKE_PHOTO = 1;

    private static final String BITMAP_STORAGE_KEY = "viewbitmap";
    private static final String IMAGEVIEW_VISIBILITY_STORAGE_KEY = "imageviewvisibility";
    private ImageView mImageView;
    private Bitmap mImageBitmap;

    private static final String VIDEO_STORAGE_KEY = "viewvideo";
    private static final String VIDEOVIEW_VISIBILITY_STORAGE_KEY = "videoviewvisibility";
    private VideoView mVideoView;
    private Uri mVideoUri;

    private String mCurrentPhotoPath;

    private static final String JPEG_FILE_PREFIX = "IMG_";
    private static final String JPEG_FILE_SUFFIX = ".jpg";

    private AlbumStorageDirFactory mAlbumStorageDirFactory = null;


    /* Photo album for this application */
    private String getAlbumName() {
        return getString(R.string.album_name);
    }


    private File getAlbumDir() {
        File storageDir = null;

        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {

            storageDir = mAlbumStorageDirFactory.getAlbumStorageDir(getAlbumName());

            if (storageDir != null) {
                if (! storageDir.mkdirs()) {
                    if (! storageDir.exists()){
                        Log.d("CameraSample", "failed to create directory");
                        return null;
                    }
                }
            }

        } else {
            Log.v(getString(R.string.app_name), "External storage is not mounted READ/WRITE.");
        }

        return storageDir;
    }

    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = JPEG_FILE_PREFIX + timeStamp + "_";
        File albumF = getAlbumDir();
        File imageF = File.createTempFile(imageFileName, JPEG_FILE_SUFFIX, albumF);
        return imageF;
    }

    private File setUpPhotoFile() throws IOException {

        File f = createImageFile();
        mCurrentPhotoPath = f.getAbsolutePath();

        return f;
    }

    private void setPic() {

        /* There isn't enough memory to open up more than a couple camera photos */
        /* So pre-scale the target bitmap into which the file is decoded */

        /* Get the size of the ImageView */
        int targetW = mImageView.getWidth();
        int targetH = mImageView.getHeight();

        /* Get the size of the image */
        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
        int photoW = bmOptions.outWidth;
        int photoH = bmOptions.outHeight;

        /* Figure out which way needs to be reduced less */
        int scaleFactor = 1;
        if ((targetW > 0) || (targetH > 0)) {
            scaleFactor = Math.min(photoW/targetW, photoH/targetH);
        }

        /* Set bitmap options to scale the image decode target */
        bmOptions.inJustDecodeBounds = false;
        bmOptions.inSampleSize = scaleFactor;
        bmOptions.inPurgeable = true;

        /* Decode the JPEG file into a Bitmap */
        Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);

        /* Associate the Bitmap to the ImageView */
        mImageView.setImageBitmap(bitmap);
        mVideoUri = null;
        mImageView.setVisibility(View.VISIBLE);
        mVideoView.setVisibility(View.INVISIBLE);
    }

    private void galleryAddPic() {
        Intent mediaScanIntent = new Intent("android.intent.action.MEDIA_SCANNER_SCAN_FILE");
        File f = new File(mCurrentPhotoPath);
        Uri contentUri = Uri.fromFile(f);
        mediaScanIntent.setData(contentUri);
        this.sendBroadcast(mediaScanIntent);
    }

    private void dispatchTakePictureIntent(int actionCode) {

        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        switch(actionCode) {
            case ACTION_TAKE_PHOTO:
                File f = null;

                try {
                    f = setUpPhotoFile();
                    mCurrentPhotoPath = f.getAbsolutePath();
                    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
                } catch (IOException e) {
                    e.printStackTrace();
                    f = null;
                    mCurrentPhotoPath = null;
                }
                break;

            default:
                break;
        } // switch

        startActivityForResult(takePictureIntent, actionCode);
    }



    private void handleBigCameraPhoto() {

        if (mCurrentPhotoPath != null) {
            setPic();
            galleryAddPic();
            mCurrentPhotoPath = null;
        }

    }

    private void handleCameraVideo(Intent intent) {
        mVideoUri = intent.getData();
        mVideoView.setVideoURI(mVideoUri);
        mImageBitmap = null;
        mVideoView.setVisibility(View.VISIBLE);
        mImageView.setVisibility(View.INVISIBLE);
    }

    Button.OnClickListener mTakePicOnClickListener =
            new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    dispatchTakePictureIntent(ACTION_TAKE_PHOTO);
                }
            };


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

        mImageView = (ImageView) findViewById(R.id.imageView1);
        mVideoView = (VideoView) findViewById(R.id.videoView1);
        mImageBitmap = null;
        mVideoUri = null;

        Button picBtn = (Button) findViewById(R.id.btnIntend);
        setBtnListenerOrDisable(
                picBtn,
                mTakePicOnClickListener,
                MediaStore.ACTION_IMAGE_CAPTURE
        );


        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
            mAlbumStorageDirFactory = new FroyoAlbumDirFactory();
        } else {
            mAlbumStorageDirFactory = new BaseAlbumDirFactory();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case ACTION_TAKE_PHOTO: {
                if (resultCode == RESULT_OK) {
                    handleBigCameraPhoto();
                }
                break;
            } // ACTION_TAKE_PHOTO

        } // switch
    }

    // Some lifecycle callbacks so that the image can survive orientation change
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putParcelable(BITMAP_STORAGE_KEY, mImageBitmap);
        outState.putParcelable(VIDEO_STORAGE_KEY, mVideoUri);
        outState.putBoolean(IMAGEVIEW_VISIBILITY_STORAGE_KEY, (mImageBitmap != null) );
        outState.putBoolean(VIDEOVIEW_VISIBILITY_STORAGE_KEY, (mVideoUri != null) );
        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mImageBitmap = savedInstanceState.getParcelable(BITMAP_STORAGE_KEY);
        mVideoUri = savedInstanceState.getParcelable(VIDEO_STORAGE_KEY);
        mImageView.setImageBitmap(mImageBitmap);
        mImageView.setVisibility(
                savedInstanceState.getBoolean(IMAGEVIEW_VISIBILITY_STORAGE_KEY) ?
                        ImageView.VISIBLE : ImageView.INVISIBLE
        );
        mVideoView.setVideoURI(mVideoUri);
        mVideoView.setVisibility(
                savedInstanceState.getBoolean(VIDEOVIEW_VISIBILITY_STORAGE_KEY) ?
                        ImageView.VISIBLE : ImageView.INVISIBLE
        );
    }

    /**
     * Indicates whether the specified action can be used as an intent. This
     * method queries the package manager for installed packages that can
     * respond to an intent with the specified action. If no suitable package is
     * found, this method returns false.
     * http://android-developers.blogspot.com/2009/01/can-i-use-this-intent.html
     *
     * @param context The application's environment.
     * @param action The Intent action to check for availability.
     *
     * @return True if an Intent with the specified action can be sent and
     *         responded to, false otherwise.
     */
    public static boolean isIntentAvailable(Context context, String action) {
        final PackageManager packageManager = context.getPackageManager();
        final Intent intent = new Intent(action);
        List<ResolveInfo> list =
                packageManager.queryIntentActivities(intent,
                        PackageManager.MATCH_DEFAULT_ONLY);
        return list.size() > 0;
    }

    private void setBtnListenerOrDisable(
            Button btn,
            Button.OnClickListener onClickListener,
            String intentName
    ) {
        if (isIntentAvailable(this, intentName)) {
            btn.setOnClickListener(onClickListener);
        } else {
            btn.setText(
                    getText(R.string.cannot).toString() + " " + btn.getText());
            btn.setClickable(false);
        }
    }

}

谁能帮帮我？ 谢谢

Answer 1

文件保存到您从createImageFile() 方法获得的路径，该路径保存为mCurrentPhotoPath。您可以随时从此路径中检索照片，就像在 setPic() 和 BitmapFactory.decodeFile() 中一样。因此，要在新的Activity 中查看图像，您只需将该路径传递给onActivityResult() 中的Intent：

Intent intent = new Intent(this, ViewActivity.class);
intent.setData(Uri.parse(mCurrentPhotoPath));
startActivity(intent);

然后你可以在新的Activity中检索这个路径：

String photoPath = getIntent().getData().toString();