使用Android相机拍摄照片后开始新活动

Question

我正在使用Google PhotoIntentActivity示例在我的应用中实施原生Android相机。 在这个示例中，您单击主活动中的一个按钮（名为PhotoIntentActivity），启动摄像头，拍摄照片，然后照片在始终放置在同一活动中的ImageView中可视化。 而不是呆在那里，我想开始一个意图，并在一个新的活动中可视化照片。

我无法理解照片在主要活动中的位置，以及我应该在哪里/如何发布新意向。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); 
     } 
    } 

} 

任何人都可以帮我吗？ 谢谢

Answer 1

将文件保存到您从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，如setPic()与BitmapFactory.decodeFile()一样。因此，在新的Activity查看图像，你只需要这条道路传递给Intent在onActivityResult()：

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

然后你可以检索新Activity这个路径：

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