生成自己的應用相冊以保存來自相機的圖像，就像Messenger和Whatsapp應用程序

Question

我想在用戶在我的應用程序中使用相機拍攝照片時爲我的應用程序在圖庫中生成專用相冊。此相冊將用於保存從我的應用程序中的相機意圖中捕獲的所有圖像。它就像Messenger和Whatsapp應用一樣工作。有人知道怎麼做嗎？

public class ImageQueryActivity extends AppCompatActivity { 

    private LinearLayout mImageQueryLayout; 
    private ImageView mAddPhotoButton; 
    private String mCurrentPhotoPath; 

    final int REQUEST_IMAGE_CAPTURE = 1; 
    static final int REQUEST_GALLERY = 2; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_image_query); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       dispatchTakePictureIntent(); 
      } 
     }); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

     mImageQueryLayout = (LinearLayout) findViewById(R.id.image_query_layout); 
     mAddPhotoButton = (ImageView) findViewById(R.id.add_photo_image_view); 
     mAddPhotoButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       dispatchTakePictureIntent(); 
      } 
     }); 
    } 

    // dp to pixel converter 
    public static int convDpToPx(Context context, float dp) { 
     DisplayMetrics metrics = context.getResources().getDisplayMetrics(); 
     return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, metrics); 
    } 

    private File createImageFile() throws IOException { 
     // Create an image file name 
     String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
     String imageFileName = "JPEG_" + timeStamp + "_"; 
     File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES); 
     File image = File.createTempFile(
       imageFileName, /* prefix */ 
       ".jpg",   /* suffix */ 
       storageDir  /* directory */ 
     ); 

     // Save a file: path for use with ACTION_VIEW intents 
     mCurrentPhotoPath = image.getAbsolutePath(); 
     return image; 
    } 

    private void dispatchTakePictureIntent() { 
     AlertDialog.Builder builder = new AlertDialog.Builder(ImageQueryActivity.this); 
     builder.setPositiveButton("Camera", new DialogInterface.OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       if (takePictureIntent.resolveActivity(getPackageManager()) != null) { 
        File photoFile = null; 
        try { 
         photoFile = createImageFile(); 
        } catch (IOException ex) { 
         Toast.makeText(getApplicationContext(), 
           "Problem occurred while saving photo", 
           Toast.LENGTH_LONG).show(); 
        } 
        if (photoFile != null) { 
         Uri photoURI = FileProvider.getUriForFile(getApplicationContext(), 
           "com.kelvin.foodizzy.fileprovider", 
           photoFile); 
         takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI); 
         startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE); 
         galleryAddPic(mCurrentPhotoPath); 
        } 
       } 
      } 
     }); 
     builder.setNegativeButton("Gallery", new DialogInterface.OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       Intent intent = new Intent(); 
       intent.setType("image/*").setAction(Intent.ACTION_GET_CONTENT); 
       startActivityForResult(Intent.createChooser(intent, "Select File"), REQUEST_GALLERY); 
      } 
     }); 
     builder.show(); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (resultCode == RESULT_OK) { 
      if (requestCode == REQUEST_IMAGE_CAPTURE) { 
       ImageView imageView = new ImageView(this); 
       LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams 
         (LinearLayout.LayoutParams.MATCH_PARENT, 
           convDpToPx(getApplicationContext(), 180)); 
       layoutParams.setMargins(layoutParams.leftMargin, layoutParams.topMargin, 
         layoutParams.rightMargin, convDpToPx(getApplicationContext(), 20)); 
       imageView.setLayoutParams(layoutParams); 
       imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
       imageView.setImageBitmap(BitmapFactory.decodeFile(mCurrentPhotoPath)); 
       galleryAddPic(mCurrentPhotoPath); 
       mImageQueryLayout.addView(imageView); 
      } 
     } 
    } 

    private void galleryAddPic(String file) { 
     Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 
     File f = new File(file); 
     Uri contentUri = Uri.fromFile(f); 
     mediaScanIntent.setData(contentUri); 
     sendBroadcast(mediaScanIntent); 
    } 

} 

Answer 1

最後我設法解決了我的問題。這項工作API上面24

//set file storage to getExternalStoragePublicDirectory 
    private File createImageFile() throws IOException { 
      @SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
      String imageFileName = "JPEG_" + timeStamp + "_"; 
      File storageDir = new File(Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_PICTURES), "Foodizzy"); 
      if (!storageDir.exists()) { 
       if (!storageDir.mkdirs()) { 
        Log.d("Camera", "failed to create directory"); 
        return null; 
       } 
      } 
      File image = File.createTempFile(
        imageFileName, 
        ".jpg", 
        storageDir 
      ); 
      mCurrentPhotoPath = image.getAbsolutePath(); 
      return image; 
     } 

//Inside camera intent, use file provider to get photo uri 
Intent takePictureIntent = new Intent(); 
    takePictureIntent.setAction(MediaStore.ACTION_IMAGE_CAPTURE); 


    if (takePictureIntent.resolveActivity(getPackageManager()) != null) { 
     File photoFile = null; 
    try { 
      photoFile = createImageFile(); 
    } catch (IOException ex) { 
      ex.printStackTrace(); 
    } 
    if (photoFile != null) { 
     Uri photoURI = FileProvider.getUriForFile(getApplicationContext(), 
     BuildConfig.APPLICATION_ID + ".fileprovider", photoFile); 
     takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI); 
     startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE); 
    } 
     } 


//to store the image inside photo Gallery/(in my Nexus phone is Photos), create the following method 
private void galleryAddPic() { 
     Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 
     File f = new File(mCurrentPhotoPath); 
     Uri contentUri = Uri.fromFile(f); 
     mediaScanIntent.setData(contentUri); 
     this.sendBroadcast(mediaScanIntent); 
     } 

//and call the method inside onActivityResult 
@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     if (resultCode == RESULT_OK) { 
      if (requestCode == REQUEST_IMAGE_CAPTURE) { 
       //code to get bitmap or whatever 
       galleryAddPic(); 

      } 
     } 
    } 

    //Inside AndroidManifest.xml, add provider inside application 
    <application 
      ... 
      ...> 
      <provider 
       android:name="android.support.v4.content.FileProvider" 
       android:authorities="${applicationId}.fileprovider" 
       android:exported="false" 
       android:grantUriPermissions="true"> 
       <meta-data 
        android:name="android.support.FILE_PROVIDER_PATHS" 
        android:resource="@xml/file_paths" /> 
      </provider> 
    </application> 

    //create a file named "file_paths.xml" under xml and add the following code 
    <?xml version="1.0" encoding="utf-8"?> 
    <paths> 
     <external-path name="external_files" path="."/> 
    </paths>