今天就跟大家聊聊有关如何在Android中自定义一个音乐波动特效图，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
Android是什么
Android是一种基于Linux内核的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。
自定义属性：
<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="musicPlayViewAttr"> <!--指针颜色--> <attr name="point_color" format="color" /> <!--指针数量--> <attr name="point_num" format="integer" /> <!--指针宽度--> <attr name="point_width" format="float" /> <!--指针波动速度--> <attr name="point_speed" format="integer" /> </declare-styleable></resources>编写自定义MusicPlayview
public class MusicPlayView extends View { //坐标原点x private float mBasePointX; //坐标原点y private float mBasePointY; //指针的数量 默认10 private int mPointNum; //指针间的间隙 默认5dp private float mPointSpace; //每个指针的宽度 默认5dp private float mPointWidth; //指针的颜色 private int mPointColor = Color.RED; //指针的集合 private List<Pointer> mPoints; //控制开始/停止 private boolean mIsPlaying = false; //播放线程 private Thread mPlayThread; //指针波动速度 private int mPointSpeed; //画笔 private Paint mPaint; public MusicPlayView(Context context) { super(context); init(); } public MusicPlayView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); //取出自定义属性 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.musicPlayViewAttr); mPointNum = ta.getInt(R.styleable.musicPlayViewAttr_point_num, 10); mPointWidth = dp2px(getContext(), ta.getFloat(R.styleable.musicPlayViewAttr_point_width, 5f)); mPointColor = ta.getColor(R.styleable.musicPlayViewAttr_point_color, Color.RED); mPointSpeed = ta.getInt(R.styleable.musicPlayViewAttr_point_speed, 40); init(); } public MusicPlayView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.musicPlayViewAttr); mPointNum = ta.getInt(R.styleable.musicPlayViewAttr_point_num, 10); mPointWidth = dp2px(getContext(), ta.getFloat(R.styleable.musicPlayViewAttr_point_width, 5f)); mPointColor = ta.getColor(R.styleable.musicPlayViewAttr_point_color, Color.RED); mPointSpeed = ta.getInt(R.styleable.musicPlayViewAttr_point_speed, 40); init(); } private void init() { mPoints = new ArrayList<>(); //绘制虚线 mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setColor(mPointColor); mPaint.setAntiAlias(true); mPaint.setStrokeWidth(mPointWidth); mPaint.setPathEffect(new DashPathEffect(new float[]{25, 15}, 0));//虚线间隔 setLayerType(LAYER_TYPE_SOFTWARE, null); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); //获取逻辑原点的Y mBasePointY = getHeight() - getPaddingBottom(); Random random = new Random(); if (mPoints != null) mPoints.clear(); for (int i = 0; i < mPointNum; i++) { //随机高度 mPoints.add(new Pointer((float) (0.1 * (random.nextInt(10) + 1) * (getHeight() - getPaddingBottom() - getPaddingTop())))); } //计算每个指针之间的间隔 view宽度 - 左右的padding - 所有指针总共宽度 再除以多少个间隔 mPointSpace = (getWidth() - getPaddingLeft() - getPaddingRight() - mPointWidth * mPointNum) / (mPointNum - 1); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //指针x位置 mBasePointX = 0f + getPaddingLeft() + mPointWidth / 2; //绘制每一个指针。 for (int i = 0; i < mPoints.size(); i++) { //绘制虚线 float[] pts = {mBasePointX, getHeight(), mBasePointX, (mBasePointY - mPoints.get(i).getHeight())};//重下往上动画 canvas.drawLines(pts, mPaint); //更新指针x位置 mBasePointX += (mPointSpace + mPointWidth); } } public void start() { setVisibility(VISIBLE); if (!mIsPlaying) { if (mPlayThread == null) { mPlayThread = new Thread(new PlayRunnable()); mPlayThread.start(); } mIsPlaying = true;//控制子线程中的循环 } } public void stop() { setVisibility(INVISIBLE); mIsPlaying = false; invalidate(); } private Handler myHandler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); invalidate(); } }; public class PlayRunnable implements Runnable { @Override public void run() { for (float i = 0; i < Integer.MAX_VALUE; ) { try { for (int j = 0; j < mPoints.size(); j++) { float rate = (float) Math.abs(Math.sin(i + j));//随机数 mPoints.get(j).setHeight((mBasePointY - getPaddingTop()) * rate); //每个指针的高度 } Thread.sleep(mPointSpeed);//控制动画速度 //开始/暂停 if (mIsPlaying) { myHandler.sendEmptyMessage(0); i += 0.1; } } catch (InterruptedException e) { e.printStackTrace(); } } } } public class Pointer { private float height; public Pointer(float height) { this.height = height; } public float getHeight() { return height; } public void setHeight(float height) { this.height = height; } } public static int dp2px(Context context, float dpVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, context.getResources() .getDisplayMetrics()); }}在activity_main2布局中使用MusicPlayView
<?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" tools:context=".MainActivity"> <com.hk.testapplication.MusicPlayView android:id="@+id/music_play" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:visibility="invisible" android:padding="10dp" app:point_color="#F44336" app:point_num="10" app:point_width="14" /> <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> <Button android:id="@+id/bt_play" android:layout_marginLeft="20dp" android:layout_marginRight="20dp" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:text="播放"/> <Button android:id="@+id/bt_stop" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:layout_marginRight="20dp" android:text="停止"/> </LinearLayout> </LinearLayout>MainActivity中使用
public class MainActivity2 extends AppCompatActivity implements View.OnClickListener { private Button mBtPlay,mBtStop; private MusicPlayView mMusicPlayView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); mMusicPlayView = findViewById(R.id.music_play); mBtPlay = findViewById(R.id.bt_play); mBtStop = findViewById(R.id.bt_stop); mBtPlay.setOnClickListener(this); mBtStop.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()){ case R.id.bt_play: //开始播放 mMusicPlayView.start(); break; case R.id.bt_stop: //停止播放 mMusicPlayView.stop(); break; } }}看完上述内容，你们对如何在Android中自定义一个音乐波动特效图有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注编程网行业资讯频道，感谢大家的支持。
