使用意图挽救其复选框在不同的活动进行了检查

Question

So in one activity I have a button .

clicking that button will initialize a different activity which has a list view , each view there contains list of checkboxes the user should choose from

(sort of like questions and multiple answers...)

thing is, when going back to previous activity I want the values of those checkboxes to be saved . I'm thinking intents are the way to do it but I'm not so sure how...

Answer 1

Start Activity B by using startActiviyForResult() in your button click listener.

Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
         Intent intent = new Intent(MainActivity.this);
         startActivityForResult(intent, 1234); // 1234 is used in callback
    }
});

In second activity:

For return data using back button, override onBackPressed()

@Override
public void onBackPressed() {
    Intent returnData = new Intent();
    // get data from checkboxes
    returnData.putExtra("key_1", data1);
    returnData.putExtra("key_2", data2);
    setResult(MainActivity.RESULT_OK, returnData);
    super.onBackPressed();
}

For return data using normal button, use something like this:

exitbtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
         Intent returnData = new Intent();
         // get data from checkboxes
         returnData.putExtra("key_1", data1); 
         returnData.putExtra("key_2", data2);
         setResult(MainActivity.RESULT_OK, returnData);
         finish();
    }
});

If you want cancel second activity, setResult(RESULT_CANCELED) , instead RESULT_OK.

Then in MainActivity override onActivityResult() , it is the callback when second activity finishes.

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 1234) { // previous defined
        // Make sure the request was successful
        if (resultCode == RESULT_OK) {
            int data1 = data.getIntExtra("key_1", 0); 
            int data2 = data.getIntExtra("key_2", 0); 
        }
    }
}

Strongly advice to read this

Answer 2

in your activity A :
start your activity B with startActivityForResult :

Intent intent = new Intent(ActivityA.this,ActivityB.class);
startActivityForResult(intent, 1); // intent and requestCode of 1

in your activity B : get your checkBox values :

boolean isChecked = ((CheckBox) findViewById(R.id.checkBox1)).isChecked(); // your check box value for example

then send your values back to the first activity :

public static final String FIRSTCHECKBOX = "first"; 
Intent returnIntent = new Intent();
returnIntent.putExtra(FIRSTCHECKBOX, isChecked); // add all your check box values like this
setResult(RESULT_OK, returnIntent);
finish();

if you want cancel it (such as user click on cancel btn) :

Intent returnIntent = new Intent();
setResult(RESULT_CANCELED, returnIntent);
finish();

again in your activity A :
get your values :

 protected void onActivityResult(int requestCode, int resultCode, Intent resultIntent) {
        if (resultCode == RESULT_OK) {
              if (requestCode ==1) {
                  Bolean check1 =resultIntent.getBooleanExtra(FIRSTCHECKBOX,0)// do it for all other check boxes - 0 is defualt value that you can choose 0 or 1
              }
        }

}