創建乘法表布局

Question

我正在嘗試生成用戶輸入的任何數字的乘法表。 我已經為應用程序開發了界面，但無法理解從哪里開始邏輯部分（編碼）。 我想要的是當用戶在 EditText 中輸入一個數字時，然后在 TextView（id：printArea）中應該以圖 2 中給出的格式顯示輸入數字的表格。 [只是為了向您展示我在printArea 部分，我不知道該用什么代替]

<?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>

而 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);
            }
        });
    }

}

當應用程序啟動時，它應該像這樣顯示應用程序的初始狀態

如果用戶輸入是 2最終結果，我想讓應用程序像這樣顯示表格

Answer 1

創建一個 Listview，然后在其適配器中添加您的表數據。 使適配器的布局是這樣的：

 <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

這是我用來構建我想構建的乘法表的代碼。 activity_main.xml 文件的代碼將是：

<?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 文件的代碼將是：

 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(); } }); } }

謝謝大家的指導。