Android圖片的旋轉、暫停與音樂的播放

佈局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="center_horizontal">

        <RelativeLayout
            android:layout_width="334dp"
            android:layout_height="350dp"
            android:layout_marginTop="136dp">

            <ImageView
                android:layout_width="276dp"
                android:layout_height="276dp"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="45dp"
                android:background="@drawable/icon_projection" />

            <ImageView
                android:id="@+id/iv"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@drawable/icon_audio_record" />
        </RelativeLayout>
    </LinearLayout>

    <ImageView
        android:id="@+id/iv_pause"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginBottom="40dp"
        android:background="@drawable/iv_start" />

</LinearLayout>

java代碼：

package com.shanjing.animation;

import android.animation.ObjectAnimator;
import android.media.MediaPlayer;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private ImageView iv_pause, iv;
    private ObjectAnimator mAnimator;
    private MediaPlayer mPlayer;

    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initAnimator();//進入頁面加載動畫
        initPlayer();//進入頁面加載音樂
    }

    private void initPlayer() {
        mPlayer = MediaPlayer.create(this, R.raw.wanwusheng);
        mPlayer.setLooping(true);//設置爲循環播放
        mPlayer.start();//開始播放音樂
        mPlayer.pause();//暫停播放音樂
    }

    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    private void initAnimator() {
        mAnimator = ObjectAnimator.ofFloat(iv, "rotation", 0.0f, 360.0f);
        mAnimator.setDuration(3000);//設定轉一圈的時間
        mAnimator.setRepeatCount(Animation.INFINITE);//設定無限循環
        mAnimator.setRepeatMode(ObjectAnimator.RESTART);// 循環模式
        mAnimator.setInterpolator(new LinearInterpolator());// 勻速
        mAnimator.start();//動畫開始
        mAnimator.pause();//動畫暫停
    }

    private void initView() {
        iv_pause = findViewById(R.id.iv_pause);
        iv = findViewById(R.id.iv);
        iv_pause.setOnClickListener(this);
    }

    private boolean isPause = false;

    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Override
    public void onClick(View v) {
        int i = v.getId();
        if (i == R.id.iv_pause) {
            if (!isPause) {
                iv_pause.setBackgroundResource(R.drawable.iv_pause);
                mAnimator.resume();//動畫繼續
                mPlayer.start();//繼續開始音樂播放
                isPause = true;
            } else {
                iv_pause.setBackgroundResource(R.drawable.iv_start);
                mAnimator.pause();//動畫暫停
                mPlayer.pause();//暫停音樂播放
                isPause = false;
            }
        }
    }

    @Override
    protected void onDestroy() {//銷燬
        super.onDestroy();
        mPlayer.stop();//停止播放音樂
    }
}

GitHub地址：https://github.com/cuiwenju2017/Animation