编辑文本字段为空时禁用按钮 [英] Disable Button when Edit Text Fields empty

问题描述

我有两个文本字段和一个按钮.我想禁用按钮，除非两个 EditText-Fields 都不为空.我在stackoverflow上尝试了许多解决方案，但它们不起作用.这是我的代码:

I have two text fields and a Button. I want to disable the Button unless both EditText-Fields are not empty. I tried many solutions here at stackoverflow, but they don't work. Here is my code:

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class RegisterActivity extends Activity {

    private EditText editText1;
    private EditText editText2;

    //TextWatcher
    private TextWatcher textWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3)
       {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
            checkFieldsForEmptyValues();
        }

        @Override
        public void afterTextChanged(Editable editable) {
        }
    };


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


        editText1 = (EditText) findViewById(R.id.reg_password);
        editText2 = (EditText) findViewById(R.id.reg_password2);

        //set listeners
        editText1.addTextChangedListener(textWatcher);
        editText1.addTextChangedListener(textWatcher);

        // run once to disable if empty
        checkFieldsForEmptyValues();


        TextView loginScreen = (TextView) findViewById(R.id.link_to_login);
        loginScreen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity (new Intent(getApplicationContext(), DialogActivity.class));
                finish();
            }
        });

    }

    private  void checkFieldsForEmptyValues(){
        Button b = (Button) findViewById(R.id.btnRegister);

        String s1 = editText1.getText().toString();
        String s2 = editText2.getText().toString();

        if(s1.equals("") && s2.equals(""))
        {
            b.setEnabled(false);
        }

        else if(!s1.equals("")&&s2.equals("")){
            b.setEnabled(false);
        }

        else if(!s2.equals("")&&s1.equals(""))
        {
            b.setEnabled(false);
        }

        else
        {
            b.setEnabled(true);
        }
    }
}

如果我开始活动，它会被禁用.但是如果我输入一些东西，它有时会启用，有时不会.如果两个编辑文本字段都不为空，我只想启用按钮.

If I start the activity, it is disabled. But If I type something, it sometimes enables and sometimes doesn't.. I just want to enable the button if both Edit-Text Fields are not empty.

推荐答案

你的问题在这里:

//set listeners
        editText1.addTextChangedListener(textWatcher);
        editText1.addTextChangedListener(textWatcher);

您没有将 textWatcher 设置为 editText2，因此如果您在 editText1 中写入，则始终检查条件

You are not setting the textWatcher to editText2, so you are always checking the condition if you write inside editText1

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