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.
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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