CODEWITHSUNDEEP
androidlistviewarraylist
Snehal
Snehal

Reputation: 233

Adding items on ArrayList

In my application, i am having scan button. On its click i am opening another application "BarcodeScanner" which scans the barcode and returns the result to my application in onActivityResult where i am adding the result on ArrayList. If i again click scan button and again open BarcodeReader application to scan the next barcode, my previous result on the arraylist is getting cleared. So everytime i get the result of BarcodeScanner, only recent result is present on ArrayList. How to maintain all reslutls so that i can show all scanned barcodes in a list? Please help..

Here is my code 

     public void onClick(View v){
        //check for scan button
        if(v.getId()==R.id.scan_barcode){


            //instantiate ZXing integration class
            IntentIntegrator scanIntegrator = new IntentIntegrator(this);
            //start scanning
            scanIntegrator.initiateScan();
        }
    }

    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        //retrieve result of scanning - instantiate ZXing object
        IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
        //check we have a valid result
        if (scanningResult != null) {
            //get content from Intent Result
            String scanContent = scanningResult.getContents();
            //get format name of data scanned
            String scanFormat = scanningResult.getFormatName();

            //Add to arraylist
            barcodes.add(scanContent);




                 }                
        }
        else{
            //invalid scan data or scan canceled
            Toast toast = Toast.makeText(getApplicationContext(), 
                    "No scan data received!", Toast.LENGTH_SHORT);
            toast.show();
        }
    }

Upvotes: 2

Views: 989

Answers (4)

Jagadesh Seeram
Jagadesh Seeram

Reputation: 2664

1 . In your MainActivity pass the Globally declared ArrayList through the intent to the SecondActivity using startActivityForResult() 

//Pass the ArrayList from the MainActivity
intent.putExtra("ARRAYLIST", arrayList);
startActivityForResult(intent, REQ_CODE);

// In your on Activity Result get the data
Bundle extras = intent.getExtras();
if(extras != null){
    arrayList = (ArrayList) extras.get("RESULT_ARRAYLIST");
}

2 . Get the ArrayList in the SecondActivity, you can perform the operations on the Arraylist in the SecondActivity, When you are finished just pass the same ArrayList using the Intent by using setResult(resultCode, data)

// Get the Data in the SecondActivity
Bundle extras = getIntent().getExtras();
if(extras != null){
    resultArrayList = (ArrayList) extras.get("ARRAYLIST");
}

// When you are finished
intent.putExtra("RESULT_ARRAYLIST", resultArrayList);
setResult(RESULT_OK,data);

Upvotes: 0

SoulRayder
SoulRayder

Reputation: 5166

Store the array list in shared preferences.

Note: Also provide a button, on which click, you can clear that list stored in shared preferences if you want. Many times, especially for testing purposes, you may want to refresh that list. So by providing an option for that, you can reset the arraylist, or still maintain data between different app executions.

Upvotes: 0

MobileDev
MobileDev

Reputation: 176

Can you show me your code? If the arraylist is a varaible on class level, it shouldn't be like that.

Here is the sample to help:

BarcodeScanner scanner = new BarcodeScanner();
ArrayList<Result> list = new ArrayList<Result>();

public void onActivityResult() {
   Result value = scanner.receiveScan();
   list.add(value);
}

Upvotes: 0

dipali
dipali

Reputation: 11188

1)you can use sharedprefereces to store data in arraylist

2)you can not finish your arralist activity when start barcodescanneractivity

arralist will be declare global..and u must add the value in arraylist...

i hope its useful trick to you.

Upvotes: 0

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