笔记73 | 实现音乐转盘的旋转和暂停效果

package com.jikexueyuan.rotateanimation;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.RotateAnimation;

public class MainActivity extends Activity {


    private RotateAnimation ra;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ra = new RotateAnimation(
                0 //fromDegrees起始角度
                , 360 //toDegrees旋转角度
                , Animation.RELATIVE_TO_SELF, 0.5f,//pivotXType 旋转中心的X轴
                //RELATIVE_TO_SELF:相对自身
                Animation.RELATIVE_TO_SELF, 0.5f//pivotXValue 旋转中心的Y轴
                );
        ra.setDuration(1000);

        findViewById(R.id.btnRotateMe).setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                arg0.startAnimation(ra);
            }
        });
    }
}

package com.jikexueyuan.rotateanimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.RotateAnimation;

public class MainActivity extends Activity {


    private RotateAnimation ra;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.btnRotateMe).setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                arg0.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, R.anim.ra));
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:toDegrees="360"
    android:duration="1000"
    android:pivotX="50%"
    android:pivotY="50%" >

</rotate>

package com.even.Demo;

import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;

public class rotateImageView_ro extends ImageView{

    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 angle;//记录RotateAnimation中受插值器数值影响的角度
    private float angle2;//主要用来记录暂停时停留的角度，即View初始旋转角度
    private int viewWidth;
    private int viewHeight;
    private MusicAnim musicAnim;

    public rotateImageView_ro(Context context) {
        super(context);
        init();
    }

    public rotateImageView_ro(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public rotateImageView_ro(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init(){
        state = STATE_STOP;
        angle = 0;
        angle2 = 0;
        viewWidth = 0;
        viewHeight = 0;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        viewWidth = getMeasuredWidth();
        viewHeight = getMeasuredHeight();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.rotate(angle2,viewWidth/2,viewHeight/2);
        super.onDraw(canvas);
    }

    public class MusicAnim extends RotateAnimation{
        public MusicAnim(float fromDegrees, float toDegrees, float pivotX, float pivotY) {
            super(fromDegrees, toDegrees, pivotX, pivotY);
        }

        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {
            super.applyTransformation(interpolatedTime, t);
            angle = interpolatedTime * 360;
        }
    }

    public void playMusic(){
        if(state == STATE_PLAYING){
            angle2 = (angle2 + angle)%360;//可以取余也可以不取，看实际的需求
            musicAnim.cancel();
            state = STATE_PAUSE;
            invalidate();
        }else {
            musicAnim = new MusicAnim(0,360,viewWidth/2,viewHeight/2);
            musicAnim.setDuration(3000);
            musicAnim.setInterpolator(new LinearInterpolator());//动画时间线性渐变
            musicAnim.setRepeatCount(ObjectAnimator.INFINITE);
            startAnimation(musicAnim);
            state = STATE_PLAYING;
        }
    }

    public void stopMusic(){
        angle2 = 0;
        clearAnimation();
        state = STATE_STOP;
        invalidate();
    }
}

public class rotateImageView_ob extends ImageView{

    ObjectAnimator rotateanimation;
    public static int PLAY = 1;
    public static int PAUSE = 2;
    public static int STOP = 3;


    public rotateImageView_ob(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public rotateImageView_ob(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public rotateImageView_ob(Context context) {
        super(context);
        init();
    }

    public int statics = 0;
    private void init(){
        statics = PAUSE;
        rotateanimation = ObjectAnimator.ofFloat(this, "rotation", 0f , 360f);
        rotateanimation.setDuration(12000);
        rotateanimation.setInterpolator(new LinearInterpolator());
        rotateanimation.setRepeatCount(ObjectAnimator.INFINITE);
        rotateanimation.setRepeatMode(ObjectAnimator.RESTART);
    }

    public void Play(){
        if (statics == STOP) {
            rotateanimation.start();
            statics = PLAY;
        }else if(statics == PAUSE){
            rotateanimation.resume();
            statics = PLAY;
        }else if (statics == PLAY) {
            rotateanimation.pause();
            statics = PAUSE;
        }
    }

    public void stop(){
        rotateanimation.end();
        statics = STOP;
    }
}