创建乘法表布局

Question

我正在尝试生成用户输入的任意数字的乘法表。我已经为应用程序开发了接口，但无法理解从逻辑部分（编码）开始的位置。我想要的是当用户在EditText中输入一个数字然后在TextView（id：printArea）中应该以图像2中给出的格式显示输入数字的表格。[只是为了向您展示我在文本中使用的TextView printArea部分，我不知道该使用什么]

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity"
    android:weightSum="1">

    <LinearLayout

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:text="Please Enter a Number: "
            android:textSize="20sp" />

        <EditText
            android:id="@+id/num"
            android:layout_width="90dp"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_marginLeft="30dp"
            android:textSize="20sp" />

    </LinearLayout>


    <Button
        android:id="@+id/calculate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/log"
        android:onClick="submitNumber"
        android:text="Get Table" />

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1.0"
    android:id="@+id/printArea" />

    <LinearLayout

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/clear"
            android:layout_width="125dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="1dp"
            android:text="Clear" />

        <Button
            android:id="@+id/credits"
            android:layout_width="125dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="1dp"
            android:layout_marginRight="1dp"
            android:text="Credits" />

        <Button
            android:id="@+id/exit"
            android:layout_width="125dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="1dp"
            android:layout_marginRight="2dp"
            android:text="Exit" />

    </LinearLayout>

</LinearLayout>

，MainActivity.java是：

package com.example.tara.multiplicationtable;


import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {

    EditText num;
    Button credits;
    Button calculate;
    Button clear;
    Button exit;
    TextView printArea;

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


        num = new EditText(this);
        clear = new Button(this);
        calculate = new Button(this);
        credits = new Button(this);
        calculate = new Button(this);
        printArea = new TextView(this);

        num = (EditText) findViewById(R.id.num);

        credits = (Button) findViewById(R.id.credits);
        clear = (Button) findViewById(R.id.clear);
        exit = (Button) findViewById(R.id.exit);
        printArea = (TextView) findViewById(R.id.printArea);


        calculate = (Button) findViewById(R.id.calculate);

        calculate.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                //change the integer value into string
                int num1 = Integer.parseInt(num.getText().toString());

                // Perform action on click
                for (int i = 1; i <= 10; i++) {

                    printArea.setText(num1 + "X" + i + "=" + i * num1);


                }
            }
        });

        clear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                num.setText("");
            }
        });
        credits.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this, Credits.class);
                startActivity(i);
            }
        });
        exit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
                System.exit(0);
            }
        });
    }

}

启动应用程序时，它应显示为The initial state of application

如果用户输入为2 The Final Result

，我想让应用程序显示如下表格

Answer 1

创建Listview，然后在其适配器中添加表数据。 像这样制作适配器的布局：

 <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2"            />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="*" />
   <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="=" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="4" />

Answer 2

以下是我用来构建我想要构建的乘法表的代码。 activity_main.xml文件的代码为：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="1dp"
            android:layout_marginStart="2dp"
            android:text="@string/Enter_number"
            android:textSize="16sp" />

        <EditText
            android:id="@+id/num"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="2dp"
            android:layout_marginStart="1dp"
            android:digits="0123456789"
            android:hint="@string/hidden_text"
            android:inputType="number"
            android:maxLength="3"

            android:textSize="16sp" />

    </LinearLayout>


    <Button
        android:id="@+id/calculate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/calculate"
        android:imeOptions="actionDone"
        android:textSize="16sp"/>
    <!--android:onClick="submitNumber"-->


    <TextView
        android:id="@+id/printArea"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:textSize="20sp"
        android:background="@drawable/backimage" />

    <LinearLayout

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/clear"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="1dp"
            android:layout_marginStart="2dp"
            android:textSize="16sp"
            android:text="@string/clear"
            />

        <Button
            android:id="@+id/credits"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="1dp"
            android:layout_marginStart="1dp"
            android:textSize="16sp"
            android:text="@string/credits" />

        <Button
            android:id="@+id/exit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="2dp"
            android:layout_marginStart="1dp"
            android:layout_weight="1"
            android:textSize="16sp"
            android:text="@string/exit" />

    </LinearLayout>

</LinearLayout>

MainActivity.java文件的代码将是：

package com.example.tara.multiplicationtable;


import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {

    EditText num;
    Button credits;
    Button calculate;
    Button clear;
    Button exit;
    TextView printArea;

    //private static final String result = MainActivity.class.getSimpleName();

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

        num = new EditText(this);
        clear = new Button(this);
        calculate = new Button(this);
        credits = new Button(this);
        calculate = new Button(this);
        printArea = new TextView(this);

        num = (EditText) findViewById(R.id.num);
        credits = (Button) findViewById(R.id.credits);
        clear = (Button) findViewById(R.id.clear);
        exit = (Button) findViewById(R.id.exit);
        calculate = (Button) findViewById(R.id.calculate);
        printArea = (TextView) findViewById(R.id.printArea);

        calculate.setOnClickListener(new View.OnClickListener() {
            // Perform action on Get Table Button click
            public void onClick(View v) {


                if (num.getText().length() == 0 ){
                    printArea.setText(R.string.err_msg);
                    }

                else    {
                    //change the integer value into string
                    printArea.setText("");
                    int num1 = Integer.parseInt(num.getText().toString());
                    String result;

                    for (int i = 1; i <= 10; i++) {
                        result = (num1 + "      X     " + i + "      =     " + i * num1);
                        printArea.append("\n" + result);
                    }


                }
            }

        });

        clear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                num.setText("");
                printArea.setText("");
            }
        });
        credits.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, Credits.class));
            }
        });



        exit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "Good Bye, User!", Toast.LENGTH_SHORT).show();
                finish();

            }
        });
    }

}

感谢大家的指导。