一、各自的功能及使用场景

ImageView：用于展示一张图片，例如商品展示；

Switch：开关、控制器，常用于app设置中；

DatePicker：日期选择器，多用于订阅类的服务和功能

二、简单使用

1、布局部分

<?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:gravity="center"
    android:orientation="vertical">
    <ImageView
        android:id="@+id/iv_img"
        android:layout_width="100dp"
        android:layout_height="100dp" />
    <Button
        android:id="@+id/btn_todo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CLICK"/>
    <Switch
        android:id="@+id/s_toggle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"/>
    <TextView
        android:id="@+id/tv_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <DatePicker
        android:id="@+id/dp_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

2、代码部分

  private TextView tvDate;
    private Button btnTodo;
    private Switch sToggle;
    private DatePicker dpDate;
    private ImageView ivImg;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        setListener();
        ivImg.setImageResource(R.drawable.ic_launcher_foreground);
    }

    private void setListener() {
       btnTodo.setonClickListener(v -> {
           Toast.makeText(this, "按钮被点击", Toast.LENGTH_SHORT).show();
       });
       sToggle.setonCheckedChangeListener(new CompoundButton.onCheckedChangeListener() {
           @Override
           public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
               btnTodo.setEnabled(isChecked);
           }
       });

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            dpDate.setonDateChangedListener(new DatePicker.onDateChangedListener() {
                @Override
                public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                    tvDate.setText(year+"年"+(monthOfYear+1)+"月"+dayOfMonth+"日");
                }
            });
        }
    }

    private void initView() {
        tvDate=findViewById(R.id.tv_date);
        btnTodo=findViewById(R.id.btn_todo);
        sToggle=findViewById(R.id.s_toggle);
        dpDate=findViewById(R.id.dp_date);
        ivImg=findViewById(R.id.iv_img);
    }
}

代码中，我通过sToggle来控制btnTodo是否可点击，将dpDate获取到的日期用tvDate展示，之所以会+1是因为月份获取到的数字是从0开始的

三、运行效果

四、官网对于上述控件的属性介绍

1、ImageView

android:adjustViewBounds	Set this to true if you want the ImageView to adjust its bounds to preserve the aspect ratio of its drawable.
android:baseline	The offset of the baseline within this view.
android:baselineAlignBottom	If true, the image view will be baseline aligned with based on its bottom edge.
android:cropToPadding	If true, the image will be cropped to fit within its padding.
android:maxHeight	An optional argument to supply a maximum height for this view.
android:maxWidth	An optional argument to supply a maximum width for this view.
android:scaleType	Controls how the image should be resized or moved to match the size of this ImageView.
android:src	Sets a drawable as the content of this ImageView.
android:tint	The tinting color for the image.
android:tintMode	Blending mode used to apply the image tint.

2、Switch

android:showText	Whether to draw on/off text.
android:splitTrack	Whether to split the track and leave a gap for the thumb drawable.
android:switchMinWidth	Minimum width for the switch component.
android:switchPadding	Minimum space between the switch and caption text.
android:switchTextAppearance	TextAppearance style for text displayed on the switch thumb.
android:textOff	Text to use when the switch is in the unchecked/"off" state.
android:textOn	Text to use when the switch is in the checked/"on" state.
android:textStyle	Style (normal, bold, italic, bold\|italic) for the text.
android:thumb	Drawable to use as the "thumb" that switches back and forth.
android:thumbTextPadding	Amount of padding on either side of text within the switch thumb.
android:thumbTint	Tint to apply to the thumb.
android:thumbTintMode	Blending mode used to apply the thumb tint.
android:track	Drawable to use as the "track" that the switch thumb slides within.
android:trackTint	Tint to apply to the track.
android:trackTintMode	Blending mode used to apply the track tint.
android:typeface	Typeface (normal, sans, serif, monospace) for the text.

3、DatePicker

android:calendarTextColor	The text color list of the calendar.
android:calendarViewShown	Whether the calendar view is shown.
android:datePickerMode	Defines the look of the widget.
android:dayOfWeekBackground	The background color for the header's day of week.
android:dayOfWeekTextAppearance	The text color for the header's day of week.
android:endYear	The last year (inclusive), for example "2010".
android:firstDayOfWeek	The first day of week according to Calendar.
android:headerBackground	The background for the selected date header.
android:headerDayOfMonthTextAppearance	The text appearance for the day of month (ex.
android:headerMonthTextAppearance	The text appearance for the month (ex.
android:headerYearTextAppearance	The text appearance for the year (ex.
android:maxDate	The maximal date shown by this calendar view in mm/dd/yyyy format.
android:minDate	The minimal date shown by this calendar view in mm/dd/yyyy format.
android:spinnersShown	Whether the spinners are shown.
android:startYear	The first year (inclusive), for example "1940".
android:yearListItemTextAppearance	The list year's text appearance in the list.
android:yearListSelectorColor	The list year's selected circle color in the list.