Question

How to get the vote count to display in another activity? This is for android studio with Java codes.

private int yesVoteCount = 0;
    private int noVoteCount = 0;
    private int resetVotes = 0;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Use res ID to retrieve inflated objects and assign to variables
        mYesButton = findViewById(R.id.yes_button);
        mNoButton = findViewById(R.id.no_button);
        mResetButton = findViewById(R.id.reset_button);
        mSurveyQuestion = findViewById(R.id.survey_question);
        mYesCount = findViewById(R.id.yes_count);
        mNoCount = findViewById(R.id.no_count);

        if (savedInstanceState != null) { // Saving data
            yesVoteCount = savedInstanceState.getInt(YES_INDEX, yesVoteCount);
           noVoteCount = savedInstanceState.getInt(NO_INDEX, noVoteCount);

            mYesCount.setText(String.valueOf(yesVoteCount));
            mNoCount.setText(String.valueOf(noVoteCount));
        }
        // Listener method for when button is clicked
        mYesButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                addVote();
            }
        });

        mNoButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                addVote();
            }
        });
        // Resetting vote count
        mResetButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mYesCount.setText(String.valueOf(resetVotes)); //Resetting votes to zero
                mNoCount.setText(String.valueOf(resetVotes));
                yesVoteCount = 0; // Resetting variable back to zero
                noVoteCount = 0;
            }
        });
    }
    // Add vote when button is pressed
    private void addVote() {
        if (mYesButton.isPressed()) {
            yesVoteCount++;
            mYesCount.setText(String.valueOf(yesVoteCount)); // Adding votes
        } else if (mNoButton.isPressed()) {
            noVoteCount++;
            mNoCount.setText(String.valueOf(noVoteCount));
        }
    }
    // Data restore upon rotation
        @Override
        protected void onSaveInstanceState(Bundle outBundle) {
            super.onSaveInstanceState(outBundle);
            outBundle.putInt(YES_INDEX, yesVoteCount);
            outBundle.putInt(NO_INDEX, noVoteCount);
        }

Answer 1

  
   private int yesVoteCount = 0;
private int noVoteCount = 0;
private int resetVotes = 0;
   private Button voteActivityBtn; // let voteActivityBtn be a button (defined in layout file also) which invokes the activity to display the vote count
  
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// Use res ID to retrieve inflated objects and assign to variables
mYesButton = findViewById(R.id.yes_button);
mNoButton = findViewById(R.id.no_button);
mResetButton = findViewById(R.id.reset_button);
mSurveyQuestion = findViewById(R.id.survey_question);
mYesCount = findViewById(R.id.yes_count);
mNoCount = findViewById(R.id.no_count);
      
       voteActivityBtn = findViewById(R.id.voteActivityBtn); // suppose voteActivityBtn is defined in layout file as id "voteActivityBtn"

if (savedInstanceState != null) { // Saving data
yesVoteCount = savedInstanceState.getInt(YES_INDEX, yesVoteCount);
noVoteCount = savedInstanceState.getInt(NO_INDEX, noVoteCount);

mYesCount.setText(String.valueOf(yesVoteCount));
mNoCount.setText(String.valueOf(noVoteCount));
}
// Listener method for when button is clicked
mYesButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
addVote();
}
});

mNoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
addVote();
}
});
// Resetting vote count
mResetButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mYesCount.setText(String.valueOf(resetVotes)); //Resetting votes to zero
mNoCount.setText(String.valueOf(resetVotes));
yesVoteCount = 0; // Resetting variable back to zero
noVoteCount = 0;
}
});

// calling VoteActivity
       voteActivityBtn.setOnClickListener(new View.OnClickListener() {
           @Override
public void onClick(View view) {
// Suppose VoteActivity is the name of the Activity class to display the vote count
               Intent voteActivity = new Intent(); // create a new Intent object
               voteActivity.setClass(this, VoteActivity.class); // set the class to VoteActivity, the activity to call
               // set the parameters to send to the VoteActivity
               voteActivity.putExtra("yesVote", yesVoteCount);
               voteActivity.putExtra("noVote",noVoteCount);
              
               startActivity(voteActivity); // call the voteActivity , this will invoke the VoteActivity
              
}
       });
}
// Add vote when button is pressed
private void addVote() {
if (mYesButton.isPressed()) {
yesVoteCount++;
mYesCount.setText(String.valueOf(yesVoteCount)); // Adding votes
} else if (mNoButton.isPressed()) {
noVoteCount++;
mNoCount.setText(String.valueOf(noVoteCount));
}
}
// Data restore upon rotation
@Override
protected void onSaveInstanceState(Bundle outBundle) {
super.onSaveInstanceState(outBundle);
outBundle.putInt(YES_INDEX, yesVoteCount);
outBundle.putInt(NO_INDEX, noVoteCount);
}
}//end of Activity

In VoteActivity create 2 int data yesVoteCount and noVoteCount
In VoteActivity's onCreate method have the below statements to get the yesVoteCount and noVoteCount passed by the above activity

Intent caller = getIntent();
yesVoteCount = caller.getIntExtra("yesVote", 0); // this will set yesVoteCount to the value passed as yesVote parameter, if found else it will be set to default value of 0
noVoteCount = caller.getIntExtra("noVote",0); // this will set noVoteCount to the value passed as noVote parameter, if found else it will be set to default value of 0
The above two variables can be used to display the vote counts in the VoteActivity