I have

2. Import the file in the assets folder
3. Add an webview component in the view

4. Load the file in the component

   package com.example.myapplication

   import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.webkit.WebView

   class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val webview = findViewById(R.id.webview) webview.loadUrl("file:///android_asset/index.html")

   }
   

   }

CodePudding user response：

create an animation inside the res/animator resource folder (create it if it doesn't exist) and let's call it expand1 like so:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:ordering="sequentially">
    <set>
        <objectAnimator
            android:propertyName="scaleX"
            android:duration="1000"
            android:valueTo="0.5"
            android:interpolator="@android:anim/linear_interpolator"/>
        <objectAnimator
            android:propertyName="scaleY"
            android:duration="1000"
            android:valueTo="0.5"
            android:interpolator="@android:anim/linear_interpolator"/>
    </set>
    <set>
        <objectAnimator
            android:propertyName="scaleX"
            android:duration="1000"
            android:valueTo="1.5"
            android:interpolator="@android:anim/linear_interpolator"/>
        <objectAnimator
            android:propertyName="scaleY"
            android:duration="1000"
            android:valueTo="1.5"
            android:interpolator="@android:anim/linear_interpolator"/>
    </set>
</set>

this will create an object animator that will in turn scale up and down an icon

then create 3 more expand2 expand3 expand4

on each one change the scaleX and scaleY to be from 0.5 to 1.5 , to 0.7 to 1.3 etc, according to how big your circles should be at minimum and maximum

then create your vector drawable (ic_sound.xml) like so:

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24">
    <group
        android:name="icon">
        <path
            android:fillColor="@android:color/white"
            android:pathData=" draw the microphone icon here "/>
    </group>
    <group
        android:name="circle1">
        <path
            android:fillColor="@android:color/holo_green_light"
            android:fillAlpha="0.2"
            android:pathData=" draw the darkest circle here "/>
    </group>

     repeat three more times for circle2, circle3 and circle4 with different fillAlphas
</vector>

finally create a vector drawable like so:

<?xml version="1.0" encoding="utf-8"?>
<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/ic_sound">
    <target
        android:name="circle1"
        android:animation="@animator/expand1" />
    <target
        android:name="circle2"
        android:animation="@animator/expand2" />
    <target
        android:name="circle3"
        android:animation="@animator/expand3" />
    <target
        android:name="circle4"
        android:animation="@animator/expand4" />
</animated-vector>

what this does is that it tells the ic_sound vector, to apply an animator to each group , so circle1 will expand from 0.5 to 1.5 , circle 2 will expand from 0.7 to 1.3 and so on

you can play with the times (if you want the animation to last longer) how long it will play , the interpolators (to add an accelerate or decelerate effect) to make it look as you wish