android - 我将 TextView 用作按钮，但它无法执行其操作。按下按钮后应用程序总是崩溃

Question

我正在尝试将 TextView 用作 Button 但它无法执行其操作。按下此 TextView 按钮后，应用程序总是停止工作。

我在我的 XML 代码中添加了 android:clickable="true" 和 android:onClick="perform_action" 部分。但是每当我按下按钮时，应用程序就会停止工作。

这是一个 Activity_main.xml 代码(它不包含我试图用作按钮的 TextView):

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/btn1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    tools:visibility="visible">

    <Button
        android:id="@+id/ok"
        android:layout_width="97dp"
        android:layout_height="42dp"
        android:layout_marginStart="157dp"
        android:layout_marginLeft="157dp"
        android:layout_marginTop="62dp"
        android:layout_marginEnd="157dp"
        android:layout_marginRight="157dp"
        android:layout_marginBottom="371dp"
        android:text="Нэвтрэх"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/etToken" />

    <EditText
        android:id="@+id/etToken"
        android:layout_width="282dp"
        android:layout_height="47dp"
        android:layout_marginStart="64dp"
        android:layout_marginLeft="64dp"
        android:layout_marginTop="209dp"
        android:layout_marginEnd="65dp"
        android:layout_marginRight="65dp"
        android:layout_marginBottom="25dp"
        android:ems="10"
        android:hint="Token-оо оруулаад нэвтэрнэ үү!"
        android:inputType="textPassword"
        app:layout_constraintBottom_toTopOf="@+id/ok"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

这是我的主要 Activity 。主要 Activity 将用户引导到另一个页面(或 fragment )，其中包含我试图用作按钮的 TextView(就像一个简单的登录部分)。:

    package com.example.demo;

    import androidx.appcompat.app.AlertDialog;
    import androidx.appcompat.app.AppCompatActivity;

    import android.content.DialogInterface;
    import android.content.Intent;
    import android.graphics.Color;
    import android.os.Bundle;
    import android.text.InputType;
    import android.view.Gravity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.PopupWindow;
    import android.widget.RelativeLayout;
    import android.widget.TextView;

    import java.util.Set;

    public class MainActivity extends AppCompatActivity {
    private EditText txt;
    private String token = "123456";
    private Button btn, btn1;
    private String Anhaaramj_ogoh_ortoo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView ortoohead = findViewById(R.id.ortoohead);
        txt = findViewById(R.id.etToken);
        btn = findViewById(R.id.ok);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                check(txt.getText().toString());
            }
        });
    }
    public void showAlert(View view){
        AlertDialog.Builder alert1 = new AlertDialog.Builder(this);
        alert1.setMessage("Уучлаарай таны оруулсан token буруу байна!")
                .setPositiveButton("Дахин оролдох", new 
   DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        dialogInterface.dismiss();
                    }
                })
                .create();
        alert1.show();
    }
    public void check(String Tkn){
        if(Tkn.equals(token)){
            Intent intent = new Intent(MainActivity.this, harnaa.class);
            txt.setText(null);
            startActivity(intent);
        }
        else{
            showAlert(null);
            txt.setText(null);
        }
    }

    public void perform_action(View v)
    {
        TextView tv = findViewById(R.id.ortoohead);

        //alter text of textview widget
        tv.setText("This text view is clicked");

        //assign the textview forecolor
        tv.setTextColor(Color.GREEN);
    }

此 activity_attention.xml 包含我的 TextView，这是最后一个 TextView:

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/valuebody"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_below="@id/valuehead"
        android:text="Анхаарамж өгөх болсон шалтгаанаа бичнэ үү?" />

    <TextView
        android:id="@+id/valuehead"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/epbody"
        android:text="Анхаарамжийн утга:"
        android:textColor="#000000"
        android:textSize="30dip" />

    <TextView
        android:id="@+id/epbody"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_below="@id/ephead"
        android:text="КП-КМ"
        android:textSize="15dip" />

    <TextView
        android:id="@+id/ephead"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/spbody"
        android:text="Дуусах цэг:"
        android:textColor="#000000"
        android:textSize="30dip" />

    <TextView
        android:id="@+id/spbody"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_below="@id/sphead"
        android:text="КМ-ПК"
        android:textSize="15dip" />

    <TextView
        android:id="@+id/sphead"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/posbody"
        android:text="Эхлэх Цэг:"
        android:textColor="#000000"
        android:textSize="30dip" />

    <TextView
        android:id="@+id/posbody"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_below="@id/poshead"
        android:text="Таны байршил"
        android:textSize="15dip" />

    <TextView
        android:id="@+id/poshead"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/hoorondbody"
        android:text="Ажил хийх байршил:"
        android:textColor="#000000"
        android:textSize="30dip" />

    <TextView
        android:id="@+id/hoorondbody"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_below="@id/hoorondhead"
        android:layout_marginTop="2dp"
        android:text="Наран-Элгэн-Оорцог-Энгэр"
        android:textSize="15dip" />

    <TextView
        android:id="@+id/hoorondhead"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/ehlehbody"
        android:text="Хоорондын зам:"
        android:textColor="#000000"
        android:textSize="30dip" />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:id="@+id/ehlehbody"
        android:layout_below="@id/ehlehhead"
        android:text="2019/07/25 22:35"
        android:textSize="15dip"/>

    <TextView
        android:id="@+id/ehlehhead"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/ortoobody"
        android:text="Эхлэх огноо:"
        android:textColor="#000000"
        android:textSize="30dip" />

    <TextView
        android:id="@+id/ortoobody"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_below="@id/ortoohead"
        android:text="Өртөөний нэр"
        android:textSize="15dip"
        android:clickable="true"/>

    <TextView
        android:id="@+id/ortoohead"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:clickable="true"
        android:onClick="perform_action"
        android:text="Анхаарамж өгөх өртөөд:"
        android:textColor="#000000"
        android:textSize="30dip" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/valuebody"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_marginTop="22dp"
        android:layout_marginEnd="36dp"
        android:layout_marginRight="36dp"
        android:onClick="SetOrtoo"
        android:text="Button" />


</RelativeLayout>

最后Attention.java it a Fragment:

    package com.example.demo;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class Attention extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.activity_attention, container, false);
    }

}

Answer 1

当您尝试从 fragment 中单击 TextView 时，您需要像这样实现 -

只需将您的 Attention fragment 代码替换为以下 fragment 即可。

package com.example.demo;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import androidx.annotation.Nullable;
    import androidx.fragment.app.Fragment;

    public class Attention extends Fragment {
        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            return inflater.inflate(R.layout.activity_attention, container, false);
        }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        TextView ortooheadTextView = getActivity().findViewById(R.id.ortoohead);
            ortooheadTextView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(getActivity(), "TextView clicked.", Toast.LENGTH_LONG).show();      
                }
            });
    }

    }