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我正在练习,我被困在一个点上,我想将用户输入文本从 EditText 设置为 TextView 但我不知道该怎么做,所以我在这里搜索它,我发现了这个How to get EditText value to TextView 在 android [关闭] 中键入时没有按钮单击 我遵循此但它不起作用所以我决定发布一个新问题以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);
}
}

如果您回答了这个问题,请提前感谢。

4

3 回答 3

2

在您的代码中,您将侦听器设置为 TextView ( tv1),您必须将其添加到 EditText ( et1)。你可以这样做:

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); // set TextView text to Text inside EditText
            }
        };

        et1.addTextChangedListener(textWatcher); // add Listener to EditText
    }
}
于 2020-10-13T07:53:03.100 回答
0

简要说明。“准时用户输入”是什么?但是,如果您想在您的 editText 中键入内容时更改您的 textView。只需在 onTextChanged() 中执行此操作:

public void onTextChanged(CharSequence s, int start, int before, int count) {
        textView.setText(editText.getText().toString().trim());
    }
于 2020-10-13T07:54:09.750 回答
0

从文本观察器获取文本后只需更改您的 TextView,需要这样的东西:

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)
    }
};
于 2020-10-13T07:54:48.573 回答