Android 控件保持宽高比得几种方式

文章目录

Android 控件保持宽高比得几种方式

adjustViewBounds

仅适用于 ImageView,保持横竖比。

xml 复制代码
<ImageView
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:layout_gravity="center"
           android:adjustViewBounds="true"
           android:scaleType="fitXY"
           android:src="@drawable/bg" />

百分比布局

宽高比为 16:9

xml 复制代码
<androidx.percentlayout.widget.PercentFrameLayout 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=".ratio.PercentFragment">

    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:scaleType="fitXY"
        android:src="@drawable/bg"
        app:layout_aspectRatio="178%"
        app:layout_widthPercent="100%" />

</androidx.percentlayout.widget.PercentFrameLayout>

ConstraintLayout

宽高比为 16:9

kotlin 复制代码
<?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=".ratio.ConstraintLayoutFragment">

    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:scaleType="fitXY"
        android:src="@drawable/bg"
        app:layout_constraintDimensionRatio="16:9"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

自定义View

自定义View:

xml 复制代码
<declare-styleable name="MyRatioFrameLayout">
    <attr name="whRatio" format="string" />
</declare-styleable>
kotlin 复制代码
class MyRatioFrameLayout @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : FrameLayout(context, attrs, defStyleAttr) {
    private var widthRatio: Float = 0F
    private var heightRatio: Float = 0F

    init {
        val a = context.obtainStyledAttributes(attrs, R.styleable.MyRatioFrameLayout)
        val whRatio = a.getString(R.styleable.MyRatioFrameLayout_whRatio)
        a.recycle()
        whRatio?.let {
            val strs = it.split(":");
            when (strs.size) {
                1 -> {
                    widthRatio = strs[0].toFloat()
                    heightRatio = 1F
                }
                2 -> {
                    widthRatio = strs[0].toFloat()
                    heightRatio = strs[1].toFloat()
                }
            }
        }
    }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        var wMeasureSpec = widthMeasureSpec
        var hMeasureSpec = heightMeasureSpec
        if (widthRatio != 0F && heightRatio != 0F) {
            val ratio = getRatio()
            val lp: ViewGroup.LayoutParams = layoutParams
            val widthMode = MeasureSpec.getMode(widthMeasureSpec)
            val widthSize = MeasureSpec.getSize(widthMeasureSpec)
            val heightMode = MeasureSpec.getMode(heightMeasureSpec)
            val heightSize = MeasureSpec.getSize(heightMeasureSpec)
            if (lp.width != ViewGroup.LayoutParams.WRAP_CONTENT && widthMode == MeasureSpec.EXACTLY &&
                lp.height != ViewGroup.LayoutParams.WRAP_CONTENT && heightMode == MeasureSpec.EXACTLY
            ) {
                // 宽度和高度都是固定值
                if (widthSize / ratio < heightSize) {
                    // 如果计算后高度小于原有高度
                    hMeasureSpec = MeasureSpec.makeMeasureSpec(
                        (widthSize / ratio).toInt(),
                        MeasureSpec.EXACTLY
                    )
                } else if (heightSize * ratio <= widthSize) {
                    // 如果计算后的宽度小于原有宽度
                    wMeasureSpec = MeasureSpec.makeMeasureSpec(
                        (heightSize * ratio).toInt(),
                        MeasureSpec.EXACTLY
                    )
                }
            } else if (lp.width != ViewGroup.LayoutParams.WRAP_CONTENT && widthMode == MeasureSpec.EXACTLY && heightMode != MeasureSpec.EXACTLY) {
                // 宽度固定值
                hMeasureSpec =
                    MeasureSpec.makeMeasureSpec((widthSize / ratio).toInt(), MeasureSpec.EXACTLY)

            } else if (lp.height != ViewGroup.LayoutParams.WRAP_CONTENT && heightMode == MeasureSpec.EXACTLY && widthMode != MeasureSpec.EXACTLY) {
                // 高度固定值
                wMeasureSpec =
                    MeasureSpec.makeMeasureSpec((heightSize * ratio).toInt(), MeasureSpec.EXACTLY)
            }
        }
        super.onMeasure(wMeasureSpec, hMeasureSpec)
    }

    fun setRatio(widthRatio: Float, heightRatio: Float) {
        this.widthRatio = widthRatio
        this.heightRatio = heightRatio
    }

    fun getRatio(): Float {
        return widthRatio / heightRatio
    }
}

使用:

xml 复制代码
<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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"
    android:orientation="vertical"
    tools:context=".ratio.RatioViewFragment">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <com.example.tools.ratio.MyRatioFrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#ff0000"
            app:whRatio="16:9">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="fitXY"
                android:src="@drawable/bg" />
        </com.example.tools.ratio.MyRatioFrameLayout>

        <com.example.tools.ratio.MyRatioFrameLayout
            android:layout_width="200dp"
            android:layout_height="300dp"
            android:layout_marginTop="10dp"
            android:background="#00ff00"
            app:whRatio="16:9">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="fitXY"
                android:src="@drawable/bg" />
        </com.example.tools.ratio.MyRatioFrameLayout>

        <com.example.tools.ratio.MyRatioFrameLayout
            android:layout_width="300dp"
            android:layout_height="200dp"
            android:layout_marginTop="10dp"
            android:background="#0000ff"
            app:whRatio="16:9">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="fitXY"
                android:src="@drawable/bg" />
        </com.example.tools.ratio.MyRatioFrameLayout>

    </LinearLayout>
</ScrollView>
相关推荐
网安Ruler32 分钟前
代码审计-PHP专题&原生开发&SQL注入&1day分析构造&正则搜索&语句执行监控&功能定位
android
paid槮2 小时前
MySql基础:数据类型
android·mysql·adb
用户2018792831673 小时前
AMS和app通信的小秘密
android
用户2018792831673 小时前
ThreadPoolExecutor之市场雇工的故事
android
诺诺Okami4 小时前
Android Framework-Launcher-InvariantDeviceProfile
android
Antonio9155 小时前
【音视频】Android NDK 与.so库适配
android·音视频
sun00770013 小时前
android ndk编译valgrind
android
AI视觉网奇15 小时前
android studio 断点无效
android·ide·android studio
jiaxi的天空15 小时前
android studio gradle 访问不了
android·ide·android studio
No Silver Bullet16 小时前
android组包时会把从maven私服获取的包下载到本地吗
android