当Android上传图片在后台服务时卡住了应用程序

我从后台服务上传图片。我的应用程序在上传图片时卡住了。而且我也无法处理另一个web api请求，直到后台服务正在处理。当Android上传图片在后台服务时卡住了应用程序

我的活动类 CartActivity.class

public class CartActivity extends Activity { 



    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.cart_screen); 

     Intent serviceIntent = new Intent(CartActivity.this, UploadImgService.class); 
     startService(serviceIntent); 
     } 
}

我的服务类中，我是来自本地数据库并上传到服务器获取数据。 UploadImgService.class

public class UploadImgService extends Service { 

//local database 
private DataSourceUserRecords dataResource ; 
private SQLiteDatabase _database = null; 
private Cursor _cursor = null; 
private MySqliteHelper DBHelper; 


private String _userID = ""; 
private String _uniqueID = ""; 
private String _imageName = ""; 
private String _imgPath = ""; 
private int _idDB =0; 
private Bitmap _imgBitmap; 
private String _base64Str = ""; 



JSONObject outerJsonObject ; 
JSONArray _mainArray ; 


HttpClient client; 
String _responseMain = ""; 
HttpResponse responseMain; 
@Override 
public void onCreate() { 
    super.onCreate(); 
    // This method is invoked when the service is called. 
    // Need to fetch all the data from Local database 

    // do subroutines here 
    System.out.println("onCreate of Service "); 
    try{ 

     outerJsonObject = new JSONObject(); 
     _mainArray = new JSONArray(); 

     DBHelper = new MySqliteHelper(UploadImgService.this); 
     _database = DBHelper.getWritableDatabase(); 
     dataResource = new DataSourceUserRecords(UploadImgService.this); 
     dataResource.open(); 

     // _database = context.openOrCreateDatabase(MySqliteHelper, arg1, arg2) 

     //dataResource = new DataSourceUserRecords(context); 
     //_database= context.openOrCreateDatabase(MySqliteHelper.DATABASE_NAME, MODE_PRIVATE, null); 
     _cursor = _database.rawQuery("select * from "+MySqliteHelper.TABLE_NAME, null); 

     _cursor.moveToFirst(); 
     while(_cursor.isAfterLast() == false){ 

      _idDB = _cursor.getInt(_cursor.getColumnIndex(MySqliteHelper.READING_DETAILS_COLUMN_ID)); 
      _userID = _cursor.getString(_cursor.getColumnIndex(MySqliteHelper.READING_DETAILS_COLUMN_USER_ID)); 
      _uniqueID = _cursor.getString(_cursor.getColumnIndex(MySqliteHelper.READING_DETAILS_COLUMN_UNIQUE_ID)); 
      _imageName = _cursor.getString(_cursor.getColumnIndex(MySqliteHelper.READING_DETAILS_COLUMN_IMG_NAME)); 
      _imgPath = _cursor.getString(_cursor.getColumnIndex(MySqliteHelper.READING_DETAILS_COLUMN_IMAGE_PATH)); 

      System.out.println("DATA base column id :" + _idDB); 
      System.out.println("USer id from db : " + _userID); 
      System.out.println("Unique Name from db : " + _uniqueID); 
      System.out.println("Image Name from db : " + _imageName); 
      System.out.println("Image path from db : " +_imgPath); 




      JSONObject _jSubObj = new JSONObject(); 
      _imgBitmap = BitmapFactory.decodeFile(_imgPath); 
      _base64Str = Constant.convertBitmapToBase64(_imgBitmap); 
      _jSubObj.put("user_id", _userID); 
      _jSubObj.put("unique_id", _uniqueID); 
      _jSubObj.put("img_name", "image_" + _cursor.getPosition()/*+_temp_orderid*/); 
      _jSubObj.put("img_base", _base64Str); 


      _mainArray.put(_jSubObj); 


      _cursor.moveToNext(); 
     } 
     _cursor.close(); 

     try { 
      outerJsonObject.put("image_details",_mainArray); 
      if (NetworkAvailablity.checkNetworkStatus(UploadImgService.this)) { 





       try { 
        // Creating HTTP client 
        client = new DefaultHttpClient(); 

        // Creating HTTP Post 
        HttpPost httpPost= new HttpPost(WebServiceConstants 
          .getMethodUrl(WebServiceConstants.METHOD_UPLOAD_IMAGES)); 



        // Building post parameters, key and value pair 
        List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(); 

        nameValuePair.add(new BasicNameValuePair("image_details", outerJsonObject.toString())); 
        //     nameValuePair.add(new BasicNameValuePair("order_details", _mainArray.toString())); 

        // Url Encoding the POST parameters 
        httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair)); 
        responseMain = client.execute(httpPost); 
        HttpEntity entitity = responseMain.getEntity(); 

        _responseMain = EntityUtils.toString(entitity); // content will be consume only once 
        System.out.println("Response of Upload image : "+_responseMain); 
        //      System.out.println("_catID : " +_catID); 
       } catch (UnsupportedEncodingException e) { 
        // writing error to Log 
        e.printStackTrace(); 
        /*Constant.alertDialogShow(UploadImgService.this, getResources().getString(R.string.messageText), 
          "Internal server error.", "");*/ 

       } 
       catch (Exception e) { 
        // TODO: handle exception 
        e.printStackTrace(); 


       } 




      System.out.println("OuterJSON request upload image "+outerJsonObject); 


     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

    }catch(Exception e){ 
     e.printStackTrace(); 
    } 

} 




@Override 
public IBinder onBind(Intent intent) { 
    // TODO Auto-generated method stub 
    return null; 
    // A client or activity is binded to service 
} 

}

来源

2015-06-18 Shoeb Siddique

请使用AsyncTask –

@ItzikSamara发布代码我已经实现了使用异步任务并将其上传到后台服务中。但上传时，我无法处理另一个web api请求。 –

使用IntentService而不是服务。IntentService在后台线程上工作。 read this

来源

2015-06-18 09:14:51 EE66

我已经实现了使用异步任务，并在后台服务中上传我的图像。但上传时，我无法处理另一个web api请求。 –

如果你想多路asynctask并行运行，你应该使用[executeOnExecuter]（http://developer.android.com/reference/android/os/AsyncTask.html）而不是**执行***。 – EE66

当Android上传图片在后台服务时卡住了应用程序

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