英文:
How to set ontime user input text from EditView to TextView without clicking the button
问题
以下是您要求的翻译内容：
这是我的练习，我在一个地方卡住了。我想将EditText中的实时用户输入文本设置到TextView中，但我不知道如何做到这一点，所以我在这里搜索了一下，找到了这个如何在Android中实现在输入时将EditText的值实时显示到TextView而不需要按钮单击的方法（已关闭）。
我按照这个方法做了，但它不起作用，所以我决定发布一个新问题，了解是否有任何改进。
这是我的简单XML：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
android:orientation="vertical"
android:padding="10dp"
tools:context=".MainActivity">
<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="40dp"
android:text="Hello World!"
android:textColor="#000"
android:textSize="20sp" />
<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:text="Hello World!"
android:textColor="#000"
android:textSize="20sp" />
<EditText
android:id="@+id/et1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:inputType="text" />
<EditText
android:id="@+id/et2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:inputType="text" />
</LinearLayout>
这是我的Java代码：
package com.example.ontimedata;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView tv1, tv2;
EditText et1, et2;
String data1, data2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 = findViewById(R.id.tv1);
tv2 = findViewById(R.id.tv2);
et1 = findViewById(R.id.et1);
et2 = findViewById(R.id.et2);
TextWatcher textWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
Log.d("TAG", "beforeTextChanged:");
data1 = et1.getText().toString();
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d("TAG", "onTextChanged:");
data1 = et1.getText().toString();
}
@Override
public void afterTextChanged(Editable s) {
Log.d("TAG", "afterTextChanged:");
data1 = et1.getText().toString();
}
};
tv1.addTextChangedListener(textWatcher);
Log.d("TAG", "onCreate:");
TextWatcher textWatcher1 = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
data2 = et2.getText().toString();
}
@Override
public void afterTextChanged(Editable s) {
}
};
tv2.addTextChangedListener(textWatcher1);
}
}
提前感谢您的回答。
英文:
I was doing practice and I am stuck at one point that I want to set ontime user input text from EditText to TextView but I don't know how can I do this so I search it here and I found this How to get EditText value to TextView at the time of typing without button click in android [closed]
I follow this but it is not working so that I decided to post a new question to know if any improvement is there or not.
here is my simple XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
android:orientation="vertical"
android:padding="10dp"
tools:context=".MainActivity">
<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="40dp"
android:text="Hello World!"
android:textColor="#000"
android:textSize="20sp" />
<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:text="Hello World!"
android:textColor="#000"
android:textSize="20sp" />
<EditText
android:id="@+id/et1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:inputType="text" />
<EditText
android:id="@+id/et2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:inputType="text" />
</LinearLayout>
This is my java code
package com.example.ontimedata;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView tv1, tv2;
EditText et1, et2;
String data1, data2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 = findViewById(R.id.tv1);
tv2 = findViewById(R.id.tv2);
et1 = findViewById(R.id.et1);
et2 = findViewById(R.id.et2);
TextWatcher textWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
Log.d("TAG", "beforeTextChanged: ");
data1 = et1.getText().toString();
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d("TAG", "onTextChanged: ");
data1 = et1.getText().toString();
}
@Override
public void afterTextChanged(Editable s) {
Log.d("TAG", "afterTextChanged: ");
data1 = et1.getText().toString();
}
};
tv1.addTextChangedListener(textWatcher);
Log.d("TAG", "onCreate: ");
TextWatcher textWatcher1 = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
data2 = et2.getText().toString();
}
@Override
public void afterTextChanged(Editable s) {
}
};
tv2.addTextChangedListener(textWatcher1);
}
}
Thanks in advance if you answered this.
答案1
得分: 2
在您的代码中，您将监听器设置给了TextView（tv1），您需要将它添加到EditText（et1）上。您可以像这样做：
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity
{
TextView tv1;
EditText et1;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 = findViewById(R.id.tv1);
et1 = findViewById(R.id.et1);
TextWatcher textWatcher = new TextWatcher()
{
@Override
public void beforeTextChanged(
CharSequence s,
int start,
int count,
int after
)
{
Log.d("MyTag", "beforeTextChanged: ");
}
@Override
public void onTextChanged(
CharSequence s,
int start,
int before,
int count
)
{
Log.d("MyTag", "onTextChanged: ");
}
@Override
public void afterTextChanged(Editable s)
{
Log.d("MyTag", "afterTextChanged: ");
tv1.setText(s); // 将TextView的文本设置为EditText内的文本
}
};
et1.addTextChangedListener(textWatcher); // 将监听器添加到EditText上
}
}
英文:
In Your code You set listener to TextView (tv1), You have to add it to EditText (et1). You can do it like this:
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity
{
TextView tv1;
EditText et1;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 = findViewById(R.id.tv1);
et1 = findViewById(R.id.et1);
TextWatcher textWatcher = new TextWatcher()
{
@Override
public void beforeTextChanged(
CharSequence s,
int start,
int count,
int after
)
{
Log.d("MyTag",
"beforeTextChanged: "
);
}
@Override
public void onTextChanged(
CharSequence s,
int start,
int before,
int count
)
{
Log.d("MyTag",
"onTextChanged: "
);
}
@Override
public void afterTextChanged(Editable s)
{
Log.d("MyTag",
"afterTextChanged: "
);
tv1.setText(s); // set TextView text to Text inside EditText
}
};
et1.addTextChangedListener(textWatcher); // add Listener to EditText
}
}
答案2
得分: 0
"Ontime user input" 是什么？但如果您希望在编辑文本时更改您的 textView。只需在 onTextChanged() 中执行以下操作：
public void onTextChanged(CharSequence s, int start, int before, int count) {
textView.setText(editText.getText().toString().trim());
}
英文:
Explain briefly. "Ontime user input" is what?
But if you want to change your textView while you type inside your editText.
Just do this inside onTextChanged():
public void onTextChanged(CharSequence s, int start, int before, int count) {
textView.setText(editText.getText().toString().trim());
}
答案3
得分: 0
只需在从文本监听器获取文本后更改您的TextView，需要类似以下的代码：
TextWatcher textWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
Log.d("TAG", "beforeTextChanged: ");
//data1 = et1.getText().toString();
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d("TAG", "onTextChanged: ");
//data1 = et1.getText().toString();
}
@Override
public void afterTextChanged(Editable s) {
Log.d("TAG", "afterTextChanged: ");
String text = s.toString();
tv1.setText(text);
}
};
英文:
Just change your TextView after getting text from text watcher, need somthing like this:
TextWatcher textWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
Log.d("TAG", "beforeTextChanged: ");
//data1 = et1.getText().toString();
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d("TAG", "onTextChanged: ");
//data1 = et1.getText().toString();
}
@Override
public void afterTextChanged(Editable s) {
Log.d("TAG", "afterTextChanged: ");
String text = s.toString();
tv1.setText(text)
}
};
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