项目需求
使用Android Studio开发,使用手机开发者模式调试。
(1)图中显示“语文数学”处为一个 TextView 对象,该对象可以 显示:
1、 程序启动后,默认显示个人的姓名和学号。
2 、按钮“左边”点击时,显示“左边”,按钮“右边”点击时, 显示“右边”, 开关被点击时,显示开关的状态“开”,“关”;
多选框“语文”、“数学”、“英语”被勾选时,显示被勾选的科 目;
SeekBar 控件,被拖动的时候,实时显示其值 ;
5星级控件被拖动时,实时显示值。
(2)上图中在文本框中输入“67”,然后点“确定”按钮,更新这两 个控件上面的进度条到 67%的位置。
(3)单选按钮“Apple”和“Android”为一组按钮(即都在同一个 RadioGroup 里),当选择 Apple 时,右边的图标显示为 Apple 的 logo, 当选择 Android 时,右边的图标显示为 Android 的 logo.

编写activity_main.xml
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| <?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:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity">
<CheckBox android:id="@+id/checkBox3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginEnd="40dp" android:layout_marginRight="40dp" android:layout_marginBottom="45dp" android:text="英语" app:layout_constraintBottom_toTopOf="@+id/ratingBar" app:layout_constraintEnd_toEndOf="@+id/seekBar" />
<Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="37dp" android:layout_marginLeft="37dp" android:layout_marginTop="79dp" android:layout_marginEnd="37dp" android:layout_marginRight="37dp" android:text="左边" app:backgroundTint="#B8B3B3" app:layout_constraintEnd_toStartOf="@+id/switch1" app:layout_constraintStart_toStartOf="@+id/seekBar" app:layout_constraintTop_toTopOf="parent" />
<Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:layout_marginEnd="57dp" android:layout_marginRight="57dp" android:text="右边" app:backgroundTint="#C3C2C2" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toBottomOf="@+id/textView" />
<RatingBar android:id="@+id/ratingBar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="26dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" />
<TextView android:id="@+id/textView" android:layout_width="0dp" android:layout_height="0dp" android:layout_marginStart="75dp" android:layout_marginLeft="75dp" android:layout_marginTop="17dp" android:layout_marginEnd="75dp" android:layout_marginRight="75dp" android:layout_marginBottom="5dp" android:gravity="center" android:text="name number" android:textSize="40px" app:layout_constraintBottom_toTopOf="@+id/button" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" />
<Switch android:id="@+id/switch1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:layout_marginEnd="23dp" android:layout_marginRight="23dp" android:gravity="center" android:text="开关" app:layout_constraintEnd_toStartOf="@+id/button2" app:layout_constraintTop_toBottomOf="@+id/button2" />
<ProgressBar android:id="@+id/progressBar" style="?android:attr/progressBarStyle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="61dp" android:layout_marginLeft="61dp" android:layout_marginTop="18dp" android:layout_marginEnd="44dp" android:layout_marginRight="44dp" app:layout_constraintEnd_toStartOf="@+id/progressBar2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/switch1" />
<ProgressBar android:id="@+id/progressBar2" style="?android:attr/progressBarStyleHorizontal" android:layout_width="0dp" android:layout_height="20dp" android:layout_marginTop="59dp" android:layout_marginEnd="16dp" android:layout_marginRight="16dp" android:layout_marginBottom="59dp" android:indeterminate="true" app:layout_constraintBottom_toBottomOf="@+id/progressBar3" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toEndOf="@+id/progressBar" app:layout_constraintTop_toTopOf="@+id/switch1" />
<ProgressBar android:id="@+id/progressBar3" style="?android:attr/progressBarStyleHorizontal" android:layout_width="0dp" android:layout_height="31dp" android:layout_marginTop="62dp" android:layout_marginBottom="67dp" app:layout_constraintBottom_toBottomOf="@+id/editTextTextPersonName" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/progressBar" />
<EditText android:id="@+id/editTextTextPersonName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="18dp" android:layout_marginLeft="18dp" android:layout_marginTop="67dp" android:ems="10" android:inputType="textPersonName" android:text="0" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/progressBar" />
<Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="24dp" android:layout_marginEnd="38dp" android:layout_marginRight="38dp" android:text="确定" app:backgroundTint="#C6C5C5" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toBottomOf="@+id/progressBar3" />
<CheckBox android:id="@+id/checkBox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="37dp" android:layout_marginLeft="37dp" android:layout_marginBottom="16dp" android:text="语文" app:layout_constraintBottom_toTopOf="@+id/seekBar" app:layout_constraintStart_toStartOf="@+id/seekBar" />
<CheckBox android:id="@+id/checkBox2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="16dp" android:text="数学" app:layout_constraintBottom_toTopOf="@+id/seekBar" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" />
<SeekBar android:id="@+id/seekBar" android:layout_width="0dp" android:layout_height="15dp" android:layout_marginStart="6dp" android:layout_marginLeft="6dp" android:layout_marginTop="96dp" android:layout_marginEnd="6dp" android:layout_marginRight="6dp" android:layout_marginBottom="97dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/imageView" />
<ImageView android:id="@+id/imageView" android:layout_width="155dp" android:layout_height="0dp" android:layout_marginTop="32dp" android:layout_marginBottom="32dp" app:layout_constraintBottom_toTopOf="@+id/checkBox3" app:layout_constraintEnd_toStartOf="@+id/checkBox3" app:layout_constraintStart_toStartOf="@+id/checkBox3" app:layout_constraintTop_toBottomOf="@+id/editTextTextPersonName" app:srcCompat="@drawable/oip" tools:ignore="ContentDescription,MissingConstraints" />
<RadioGroup android:id="@+id/radioGroup" android:layout_width="154dp" android:layout_height="0dp" android:layout_marginStart="28dp" android:layout_marginLeft="28dp" android:layout_marginTop="30dp" android:layout_marginBottom="31dp" app:layout_constraintBottom_toTopOf="@+id/checkBox" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/editTextTextPersonName" tools:ignore="MissingConstraints">
<RadioButton android:id="@+id/radioButton" android:layout_width="match_parent" android:layout_height="76dp" android:text="Apple" />
<RadioButton android:id="@+id/radioButton2" android:layout_width="match_parent" android:layout_height="64dp" android:text="Android" /> </RadioGroup>
</androidx.constraintlayout.widget.ConstraintLayout>
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编写MainActivity.java
不得不说,这代码写的是真的烂。
基本是一个功能写一个函数,简直毫无可读性,而且懒得写注释。
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| package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.widget.Button; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.RatingBar; import android.widget.SeekBar; import android.widget.TextView; import android.widget.Switch; import android.widget.RadioButton; import android.widget.CheckBox;
public class MainActivity extends AppCompatActivity { private TextView text; private TextView edit; private Button leftBtn; private Button rightBtn; private Button sureBtn; private CheckBox chineseBtn; private CheckBox mathBtn; private CheckBox englishBtn; private RadioButton appleBtn; private RadioButton androidBtn; private Switch aSwitch; private ProgressBar progressBar1; private ProgressBar progressBar2; private RatingBar ratingBar; private ImageView imageView; private SeekBar seekBar; private String str = "";
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); leftBtn = findViewById(R.id.button); rightBtn = findViewById(R.id.button2); sureBtn = findViewById(R.id.button3); text = findViewById(R.id.textView); edit = findViewById(R.id.editTextTextPersonName); aSwitch = findViewById(R.id.switch1); appleBtn = findViewById(R.id.radioButton); androidBtn = findViewById(R.id.radioButton2); chineseBtn = findViewById(R.id.checkBox); mathBtn = findViewById(R.id.checkBox2); englishBtn = findViewById(R.id.checkBox3); imageView = findViewById(R.id.imageView); progressBar1 = findViewById(R.id.progressBar2); progressBar2 = findViewById(R.id.progressBar3); ratingBar = findViewById(R.id.ratingBar); seekBar = findViewById(R.id.seekBar);
leftBtn.setOnClickListener(v -> { text.setText("左边"); }); rightBtn.setOnClickListener(v -> { text.setText("右边"); }); aSwitch.setOnCheckedChangeListener((buttonView, isChecked) -> { if (isChecked) { text.setText("开"); } else { text.setText("关"); } });
chineseBtn.setOnClickListener(v -> { if (chineseBtn.isClickable() ) { if (str.contains(chineseBtn.getText())) { str = str.replace(chineseBtn.getText(), ""); }else{ str += chineseBtn.getText(); } text.setText(str); } });
mathBtn.setOnClickListener(v -> { if (mathBtn.isClickable() ) { if (str.contains(mathBtn.getText())) { str = str.replace(mathBtn.getText(), ""); }else{ str += mathBtn.getText(); } text.setText(str); } });
englishBtn.setOnClickListener(v -> { if (englishBtn.isClickable() ) { if (str.contains(englishBtn.getText())) { str = str.replace(englishBtn.getText(), ""); }else{ str += englishBtn.getText(); } text.setText(str); } });
sureBtn.setOnClickListener(v -> { int num = Integer.parseInt(edit.getText().toString()); if ((0 <= num) && (num <= 100)) { progressBar2.setProgress(num); } });
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { ratingBar.setRating(progress/20); text.setText(progress+""); }
@Override public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override public void onStopTrackingTouch(SeekBar seekBar) {
} }); ratingBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() { @Override public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) { text.setText(rating+""); } });
appleBtn.setOnClickListener(v -> { if(appleBtn.isChecked()){ imageView.setImageDrawable(getResources().getDrawable(R.drawable.oip)); } }); androidBtn.setOnClickListener(v -> { if(androidBtn.isChecked()){ imageView.setImageDrawable(getResources().getDrawable(R.drawable.android)); } }); } }
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总结
刚好能完成所有功能,并且暂无bug。