《移动项目实践》实验报告——初级控件
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tags:
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实验目的
1、掌握android屏幕显示与初级视图的相关知识；
2、掌握包括屏幕显示基础、简单布局的用法、简单控件的用法、简单图形的用法
实验内容
以windows上的计算器为例，程序界面如下图所示：
完成精简之后的Android版本的计算器效果
简单计算器的运算界面效果
实验过程(实验的设计思路、关键源代码等)
源代码：https://gitee.com/shentuzhigang/mini-project/tree/master/android-simple-calculator
Layout
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".MainActivity"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_weight="1"
android:gravity="center"
android:text="@string/title"
android:textAlignment="center"
android:textSize="24sp" />
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="120dp"
android:layout_weight="1"
android:textSize="20sp"
android:padding="4sp"
android:textColor="@color/black"
android:background="@drawable/border"
android:gravity="end|bottom" />
<GridLayout
android:id="@+id/keyboard"
android:layout_width="match_parent"
android:layout_height="560dp"
android:layout_gravity="center_horizontal"
android:layout_weight="1"
android:columnCount="4"
android:rowCount="5"
android:useDefaultMargins="true">
<Button
android:id="@+id/button10"
android:text="CE"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button11"
android:text="÷"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button12"
android:text="×"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button13"
android:text="C"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button7"
android:text="@string/_7"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button8"
android:text="@string/_8"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button9"
android:text="@string/_9"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button14"
android:text="+"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button4"
android:text="@string/_4"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button5"
android:text="@string/_5"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button6"
android:text="@string/_6"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button15"
android:text="-"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button1"
android:text="@string/_1"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button2"
android:text="@string/_2"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button3"
android:text="@string/_3"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button16"
android:text="√"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button0"
android:layout_row="4"
android:layout_column="0"
android:layout_columnSpan="2"
android:text="@string/_0"
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button17"
android:text="."
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
<Button
android:id="@+id/button18"
android:text="="
android:layout_columnWeight="1"
android:layout_rowWeight="1" />
</GridLayout>
</LinearLayout>
MainActivity
package io.shentuzhigang.demo.calculator
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.Button
import android.widget.TextView
class MainActivity : AppCompatActivity() {
private lateinit var textView: TextView
private lateinit var bt_num0: Button
private lateinit var bt_num1: Button
private lateinit var bt_num2: Button
private lateinit var bt_num3: Button
private lateinit var bt_num4: Button
private lateinit var bt_num5: Button
private lateinit var bt_num6: Button
private lateinit var bt_num7: Button
private lateinit var bt_num8: Button
private lateinit var bt_num9: Button
private lateinit var bt_ce: Button
private lateinit var bt_div: Button
private lateinit var bt_mult: Button
private lateinit var bt_minus: Button
private lateinit var bt_plus: Button
private lateinit var bt_equal: Button
private lateinit var bt_dot: Button
private lateinit var bt_clear: Button
private lateinit var bt_sqrt: Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
this.textView = findViewById(R.id.textView)
this.bt_num0 = findViewById(R.id.button0)
this.bt_num0.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num1 = findViewById(R.id.button1)
this.bt_num1.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num2 = findViewById(R.id.button2)
this.bt_num2.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num3 = findViewById(R.id.button3)
this.bt_num3.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num4 = findViewById(R.id.button4)
this.bt_num4.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num5 = findViewById(R.id.button5)
this.bt_num5.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num6 = findViewById(R.id.button6)
this.bt_num6.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num7 = findViewById(R.id.button7)
this.bt_num7.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num8 = findViewById(R.id.button8)
this.bt_num8.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_num9 = findViewById(R.id.button9)
this.bt_num9.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
}
})
this.bt_ce = findViewById(R.id.button10)
this.bt_ce.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
}
})
this.bt_div = findViewById(R.id.button11)
this.bt_div.setOnClickListener(object : View.OnClickListener{
override fun onClick(v: View?) {
textView.text = textView.text.toString() + (v as Button).text
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