import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.support.annotation.Nullable;
import android.support.v7.widget.AppCompatImageView;
import android.util.AttributeSet;
import android.view.animation.LinearInterpolator;
/**
* Created AY 2018-11-26 设置圆形ImageView以及旋转动画
*/
public class CircleImageView extends AppCompatImageView {
private ObjectAnimator objectAnimator;
public static final int STATE_PLAYING = 1;//正在播放
public static final int STATE_PAUSE = 2;//暂停
public static final int STATE_STOP = 3;//停止
public int state;
private float width;
private float height;
private float radius;
private Paint paint;
private Matrix matrix;
public CircleImageView(Context context) {
this(context, null);
}
public CircleImageView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
paint = new Paint();
paint.setAntiAlias(true); //设置抗锯齿
matrix = new Matrix(); //初始化缩放矩阵
init();
}
private void init() {
state = STATE_STOP;
objectAnimator = ObjectAnimator.ofFloat(this, "rotation", 0f, 359f);//添加旋转动画，旋转中心默认为控件中点
objectAnimator.setDuration(36000);//设置动画时间
objectAnimator.setInterpolator(new LinearInterpolator());//动画时间线性渐变
objectAnimator.setRepeatCount(ObjectAnimator.INFINITE);
objectAnimator.setRepeatMode(ObjectAnimator.RESTART);
}
public void playAnim() {
if (state == STATE_STOP) {
objectAnimator.start();//动画开始
state = STATE_PLAYING;
} else if (state == STATE_PAUSE) {
objectAnimator.resume();//动画重新开始
state = STATE_PLAYING;
}
}
public void pauseAnim(){
if(state == STATE_PLAYING){
objectAnimator.pause();//动画暂停
state = STATE_PAUSE;
}
}
public void stopAnim() {
objectAnimator.end();//动画结束
state = STATE_STOP;
}
/**
* 测量控件的宽高，并获取其内切圆的半径
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = getMeasuredWidth();
height = getMeasuredHeight();
radius = Math.min(width, height) / 2;
}
@Override
protected void onDraw(Canvas canvas) {
paint.setShader(initBitmapShader());//将着色器设置给画笔
canvas.drawCircle(width / 2, height / 2, radius, paint);//使用画笔在画布上画圆
}
/**
* 获取ImageView中资源图片的Bitmap，利用Bitmap初始化图片着色器,通过缩放矩阵将原资源图片缩放到铺满整个绘制区域，避免边界填充
*/
private BitmapShader initBitmapShader() {
Bitmap bitmap = ((BitmapDrawable) getDrawable()).getBitmap();
BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
float scale = Math.max(width / bitmap.getWidth(), height / bitmap.getHeight());
matrix.setScale(scale, scale);//将图片宽高等比例缩放，避免拉伸
bitmapShader.setLocalMatrix(matrix);
return bitmapShader;
}
}以上就是直播带货APP开发，圆形旋转动画的相关代码， 更多内容欢迎关注之后的文章
