环形进度条的几种实现方式

方式一：利用ProgressBar自带属性

<ProgressBar
            android:id="@+id/iv_progress"
            android:layout_width="120dp"
            android:layout_height="120dp"
            android:layout_marginStart="90dp"
            android:layout_marginTop="50dp"
            android:layout_marginEnd="90dp"
            android:indeterminateDrawable="@drawable/loading_bg"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

loading_bg

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <rotate
            android:drawable="@mipmap/loading"
            android:fromDegrees="0"
            android:pivotX="50%"
            android:pivotY="50%"
            android:toDegrees="720" />
    </item>
</layer-list>

方式二：利用旋转动画

 ImageView mOtherDeviceScanImg = mBinding.ivOtherDeviceListRefresh;
        Animation mRotateAnimation = AnimationUtils.loadAnimation(getContext(), R.anim.loading_animator);
        if (mOtherDeviceScanImg == null) {
            LogUtils.d(TAG, "setRotateAnimation mOtherDeviceScanImg: " + mOtherDeviceScanImg);
            return;
        }
        if (start) {
            mOtherDeviceScanImg.startAnimation(mRotateAnimation);
        } else {
            mRotateAnimation.cancel();
            mOtherDeviceScanImg.clearAnimation();
        }

loading_animator

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate
        android:duration="2000"
        android:fromDegrees="0"
        android:interpolator="@android:anim/linear_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
        android:repeatCount="infinite"
        android:repeatMode="restart"
        android:toDegrees="359" />
</set>