Javascript：我不知道该如何：用零代替空白条目

Question

如果editText留为空白，我的应用程序将继续崩溃。如果单击“添加”按钮时不存在任何内容，则我需要使用这些空格来假定条目为“ 0”（零）。

 Button addBtn = (Button) findViewById(R.id.FHAddBtn);
    addBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final EditText FHEnter5RingEditText = (EditText) findViewById(R.id.FHEnter5RingEditText);
            final EditText FHEnter4RingEditText = (EditText) findViewById(R.id.FHEnter4RingEditText);
            final EditText FHEnter3RingEditText = (EditText) findViewById(R.id.FHEnter3RingEditText);
            final EditText FHEnter2RingEditText = (EditText) findViewById(R.id.FHEnter2RingEditText);
            final EditText FHEnterMissesEditText = (EditText) findViewById(R.id.FHEnterMissesEditText);
            final TextView FHScoreTextView = (TextView) findViewById(R.id.FHScoreTextView);
            final TextView FHRoundCountTextView = (TextView) findViewById(R.id.FHRoundCountTextView);

            int FHring5 = Integer.parseInt(FHEnter5RingEditText.getText().toString());
            int FHring4 = Integer.parseInt(FHEnter4RingEditText.getText().toString());
            int FHring3 = Integer.parseInt(FHEnter3RingEditText.getText().toString());
            int FHring2 = Integer.parseInt(FHEnter2RingEditText.getText().toString());
            int FHring0 = Integer.parseInt(FHEnterMissesEditText.getText().toString());

            int FHroundCount = FHring5 + FHring4 + FHring3 + FHring2 + FHring0;
            int FHresult = (FHring5 * 5) + (FHring4 * 4) + (FHring3 * 3) + (FHring2 * 2);
            FHRoundCountTextView.setText(FHroundCount + "");
            FHScoreTextView.setText(FHresult + "");

            if (FHresult < 120) {
                FHScoreTextView.setTextColor(Color.RED);
            } else if (FHresult > 150) {
                FHScoreTextView.setTextColor(Color.RED);
            }else{
                FHScoreTextView.setTextColor(Color.GREEN);
            }

            if (FHroundCount > 30)  {
                FHRoundCountTextView.setTextColor(Color.RED);
            }else{
                FHRoundCountTextView.setTextColor(Color.BLACK);
            }