Question

I am new to android field. i am developing restaurant menu application, i have created list view which shows names of items in restaurant. when i select any one item in list view it will launch another activity, it contains text view field showing detail description of selected item. similarly when i select other items, it should launch same activity but data should be of that selected item, how to achieve this ? if i use sqlite database for data source.

Answer 1

You need to pass the values onItemClick:

Intent intent = new Intent(context, CalledActivity.class);
        intent.putExtra(key, value);
        startActivity(intent);

If you want some data back from called Activity then you can use startActivityForResult() as:

Intent intent = new Intent(context, CalledActivity.class);
        intent.putExtra(key, value);
        startActivityForResult(intent, requestCode);

In called activity you can set data as:

setResult(RESULT_OK, intent);

Note: Here you set the value in intent and pass it to setResult().

On returning back to calling Activity you can get data by overriding:

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == RESULT_OK){
            //Get data from Intent "data" and do your task here....
        }
    }

Note: You can pass primitive data type values thru Intent and if you want to pass other types then you have to use Bundle like this.

Bundle data = new Bundle();
        data.putIntArray(key, value);

//same way you can set other values.......
//Now set this Bundle value to Intent as you do for primitive type....

Intent intent = new Intent(context, CalledActivity.class);
        intent.putExtra(data);
        startActivity(intent);

Receiving data in Activity:

//For primitive values:
DataType var_name = getIntent().getExtras().get(key);

//For Bundle values:
Bundle var_name = getIntent().getExtras().getBundle(key);