Question

我不知道在我的应用程序中使用TextWatcher

我想获得两个拖曳编号的结果，而无需单击使用按钮

public class MainActivity extends AppCompatActivity {

EditText editText, editText1;
TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    editText = findViewById(R.id.et);
    editText1 = findViewById(R.id.et1);
    textView = findViewById(R.id.tv);



}

public void cal(View view) {
    TextWatcher autoAddTextWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            int value1 = Integer.parseInt(editText.getText().toString());
            int value2 = Integer.parseInt(editText1.getText().toString());
            int value3=value1 + value2;
            textView.setText(Integer.toString(value3));
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            int value1 = Integer.parseInt(editText.getText().toString());
            int value2 = Integer.parseInt(editText1.getText().toString());
            int value3=value1 + value2;
            textView.setText(Integer.toString(value3));
        }

        @Override
        public void afterTextChanged(Editable s) {
            int value1 = Integer.parseInt(editText.getText().toString());
            int value2 = Integer.parseInt(editText1.getText().toString());
            int value3=value1 + value2;
            textView.setText(Integer.toString(value3));

        }
    };
    editText.addTextChangedListener( autoAddTextWatcher);
    editText1.addTextChangedListener(autoAddTextWatcher);

}

不幸的是停止了

Answer 1

请使用logcat并告知确切错误是什么

我想在不使用等于的情况下获得两个数字的结果相加

1 个答案: