本文实例为大家分享了Android简单自定义音乐波动特效图的具体代码，供大家参考，具体内容如下

最终效果：

思路：就是绘制一个不断变化高度的矩形或者是宽虚线

1.自定义属性：

2.编写自定义MusicPlayview

/**

* 音乐播放波动动画

*/

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 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();

}

/**

* 初始化画笔

*/

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);

}

/**

* 设置指针高度和即那个

*/

@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);

}

/**

* 开始绘制虚线

*/

@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);

}

}

/**

* 开始线程 播放

*/

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

}

}

/**

* 停止线程 停止播放

*/

public void stop() {

setVisibility(INVISIBLE);

mIsPlaying = false;

invalidate();

}

/**

* 更新UI

*/

private Handler myHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

invalidate();

}

};

/**

* 子线程，循环改变每个指针的高度

*/

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();

}

}

}

}

/**

* 指针对象

*/

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;

}

}

/**

* dp转px

*/

public static int dp2px(Context context, float dpVal) {

return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, context.getResources()

.getDisplayMetrics());

}

}

3.在activity_main2布局中使用MusicPlayView

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">

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" />

android:orientation="horizontal"

android:layout_width="match_parent"

android:layout_height="0dp"

android:layout_weight="1">

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"/>

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"/>

4.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;

}

}

}

因为注释都挺详细的，就没有做太多的介绍，我这里也只是提供一个思路，里面有很多可以优化的地方比方说线程使用和循环的时候，如果有不懂的地方可以留言。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。