Android-从列表活动返回数据

Question

My application has a main activity which can spawn one of four list activities, the goal is to have the user select items from the lists one after another and upon submit from the main activity push those choices to a database.

Issue: I am unsure how to return and store the results of the lists in the main activity.

I am not using a list view for the other activities as it wouldn't allow for a 'done' button on the same screen.

So far this is what I have

Main:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button1 = (Button) findViewById(R.id.listOneSub);
        button2 = (Button) findViewById(R.id.listTwoSub);
        button3 = (Button) findViewById(R.id.listThreeSub);
        button4 = (Button) findViewById(R.id.listFourSub);

        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
        button4.setOnClickListener(this);
    }


    public void onClick(View v) {
        if (v == button1) {
            startActivity(new Intent("net.learn2develop.SecondActivity"));
        } else if (v == button2) {
            startActivity(new Intent("net.learn2develop.ThirdActivity"));
        } else if (v == button3) {
            startActivity(new Intent("net.learn2develop.FourthActivity"));
        } else if (v == button4) {
            startActivity(new Intent("net.learn2develop.FifthActivity"));
        }
    }

List Activities (all four are similar, they just have different items):

String [] lstOne;

    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.secondactivity);
        ListView lstView = (ListView)findViewById(R.id.android_listOne);
        lstView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        //lstView.setTextFilterEnabled(true);

        lstOne = getResources().getStringArray(R.array.one);

        lstView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_checked, lstOne));

        }




    public void onClick(View view){
        ListView lstView = (ListView)findViewById(R.id.android_listOne);

        String itemsSelected =  "Selected items: \n";
        for(int i=0; i<lstView.getCount(); i++){
            if(lstView.isItemChecked(i)){
                itemsSelected += lstView.getItemAtPosition(i) + "\n";
            }
        }
        Toast.makeText(this, itemsSelected, Toast.LENGTH_LONG).show();
        finish();
    }

The lists are being generated from the strings.xml file. I would like to update the main view under the buttons to display what has been chosen from each list before submitting.

Answer 1

Use startActivityForResult instead of startActivity and onActivityResult will be called on your main.

I would also suggest merging these 4 classes into 1 and sending identifier of string array you want to display. Code duplication is very bad.