T005 自定义控件 可配置加载 ImageView

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原理很简单，使一张图围绕自己的中心点匀速旋转。完整代码如下：

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package com.xxt.xtest;
import android.content.Context;
import android.util.AttributeSet;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatImageView;
public class LoadingImageView extends AppCompatImageView {
    public LoadingImageView(Context context) {
        super(context);
        init();
    }
    public LoadingImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    public LoadingImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }
    private void init() {
        RotateAnimation rotateAnim = new RotateAnimation(0, 360,
                Animation.RELATIVE_TO_SELF, 0.5f,
                Animation.RELATIVE_TO_SELF, 0.5f);
        rotateAnim.setRepeatCount(Animation.INFINITE);
        rotateAnim.setDuration(1000);
        rotateAnim.setInterpolator(new LinearInterpolator());
        this.startAnimation(rotateAnim);
    }
}

使用方式：

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <com.xxt.xtest.LoadingImageView
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_margin="50dp"
        android:src="@drawable/taiji"/>
</LinearLayout>