ggplot中控制图例文字大小（ImageViewSwitch以及DatePicker的使用）

ggplot中控制图例文字大小（ImageViewSwitch以及DatePicker的使用）Set this to true if you want the ImageView to adjust its bounds to preserve the aspect ratio of its drawable.android:adjustViewBounds<?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"

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.

五、补充

一般来讲，有什么属性，就有对应的set和get方法；另外对代码中的if语句块作个简单说明：它表示android版本大于等于8.0以上才执行if里的内容