如何從圖庫中檢索圖片的Picasa ID/URL

Question

我有一個從設備圖庫中檢索圖像並上傳到服務的活動。現在，爲了優化目的，我希望避免上傳Picasa上的圖像，只保存其ID或URL以供以後檢索。

所以我的問題是，我如何檢索該信息。我的意圖代碼粘貼在下面並檢索圖像的URI。

Intent galleryIntent = new Intent(); 
galleryIntent.setType("image/*"); 
galleryIntent.setAction(Intent.ACTION_PICK); 
startActivityForResult(galleryIntent, GALLERY_PIC_REQUEST); 

我試圖查找PICASA_ID（MediaStore.Images.Media.PICASA_ID），但通過使用上述方法，則返回null。有任何想法嗎？

Answer 1

• 發動ACTION_GET_CONTENT意圖，而不是ACTION_PICK

• 提供一個額外的MediaStore.EXTRA_OUTPUT與URI到一個臨時文件。

---

添加到您的調用活動：

File yourFile; 

現在使用這個代碼來獲得意圖：

yourFile = getFileStreamPath("yourTempFile"); 
yourFile.getParentFile().mkdirs(); 
Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT, null); 
galleryIntent .setType("image/*"); 
galleryIntent .putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(yourFile)); 
galleryIntent.putExtra("outputFormat", Bitmap.CompressFormat.PNG.name()); 
startActivityForResult(galleryIntent, GALLERY_PIC_REQUEST); 

請確認yourFile在您調用活動創建

而且

protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    switch(requestCode){ 
    case GALLERY_PIC_REQUEST: 
     File file = null; 
     Uri imageUri = data.getData(); 
     if (imageUri == null || imageUri.toString().length() == 0) { 
      imageUri = Uri.fromFile(mTempFile); 
      file = mTempFile; 
      //this is the file you need! Check it 
     } 
     //if the file did not work we try alternative method 
     if (file == null) { 
      if (requestCode == 101 && data != null) { 
       Uri selectedImageUri = data.getData(); 
       String selectedImagePath = getPath(selectedImageUri); 
       //check this string to extract picasa id 
      } 
     } 
    break; 
    } 
} 

public String getPath(Uri uri) { 
    String[] projection = { MediaStore.Images.Media.DATA }; 
    Cursor cursor = managedQuery(uri, projection, null, null, null); 
    if(cursor!=null) 
    { 
     int index = cursor 
     .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
     cursor.moveToFirst(); 
     return cursor.getString(index); 
    } 
    else return null; 
} 

Answer 2

@Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     dir =new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/MyImages"); 
     dir.mkdir(); 
     filename = ("Image_" + String.valueOf(System.currentTimeMillis()) + ".poc"); 
    } 

protected Uri getTempFile() 
    { 
     File file = new File(dir,filename); 
     muri = Uri.fromFile(file); 
     return muri; 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) 
    { 
     menu.add("Pick Image"); 
     return super.onCreateOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) 
    { 
     // TODO Auto-generated method stub 
     super.onOptionsItemSelected(item); 
     openOptionsChooseDialog(); 
     return true; 
    } 

private void openOptionsChooseDialog() 
    { 
      AlertDialog.Builder builder = new AlertDialog.Builder(AppActivity.this).setTitle("Select Image").setItems(items, new DialogInterface.OnClickListener() 
      { 
       public void onClick(DialogInterface dialog, int item) 
       { 
        Intent intent = new Intent(); 
    intent.setAction(Intent.ACTION_PICK); 
         intent.setType("image/*"); 
         intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString()); 
         intent.putExtra(MediaStore.EXTRA_OUTPUT, getTempFile()); 
         startActivityForResult(intent, SELECT_PICTURE); 
} 

      }); 
      final AlertDialog alert = builder.create(); 
      alert.show(); 
    } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) 
    { 
     super.onActivityResult(requestCode, resultCode, data); 

     switch(requestCode) 
     { 
case SELECT_PICTURE : if (resultCode == RESULT_OK) 
      { 
        filepath = muri.getPath(); 
        Toast.makeText(this, filepath, Toast.LENGTH_SHORT).show(); 
       //can do bla bla bla... 
      } 

我用同樣的方法，它woks.Hope它可以幫助ü太..