Android实现音频条形图效果

效果图：

通过自定义View和属性动画实现此效果

public class BarChartView extends LinearLayout implements Runnable {
    private ViewWrapper[] mViewWrapper;

    private int barchartCount = 1;
    private int barchartWidth = 20;
    private int barchartHeight = 0;
    private int barcharMarginLeft = 5;
    private int barchartDuration = 500;
    private int barcharBackColor;

    private boolean startAnimtor = false;

    @DrawableRes
    private int myShape;

    public BarChartView(Context context) {
        this(context, null);
    }

    public BarChartView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public BarChartView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
        addBarView();
    }

    /**
     * 初始化配置
     *
     * @param context
     * @param attrs
     */
    private void init(Context context, @Nullable AttributeSet attrs) {
        setOrientation(LinearLayout.HORIZONTAL);
        setGravity(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM);

        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.BarChartView);
        barchartCount = typedArray.getInt(R.styleable.BarChartView_barchartCount, 0);
        barchartWidth = typedArray.getDimensionPixelSize(R.styleable.BarChartView_barchartWidth, 0);
        barchartHeight = typedArray.getDimensionPixelSize(R.styleable.BarChartView_barchartHeight, 0);
        barcharMarginLeft = typedArray.getDimensionPixelSize(R.styleable.BarChartView_barcharMarginLeft, 0);
        barchartDuration = typedArray.getInt(R.styleable.BarChartView_barchartDuration, 500);
        myShape = typedArray.getResourceId(R.styleable.BarChartView_barchartShape, 0);
        barcharBackColor = typedArray.getColor(R.styleable.BarChartView_barcharBackColor, Color.RED);
        typedArray.recycle();
    }

    /**
     * add View
     */
    private void addBarView() {
        if (barchartCount <= 0) {
            return;
        }
        mViewWrapper = new ViewWrapper[barchartCount];
        ImageView childView;
        LinearLayout.LayoutParams layoutParams;
        ViewWrapper viewWrapper;
        for (int i = 0; i < barchartCount; i++) {
            childView = new ImageView(getContext());
            if (myShape != 0) {
                childView.setBackgroundResource(myShape);
            } else {
                childView.setBackgroundColor(barcharBackColor);
            }
            layoutParams = new LayoutParams(barchartWidth, 100);
            layoutParams.setMargins(barcharMarginLeft, 0, 0, 0);
            childView.setLayoutParams(layoutParams);
            addView(childView);
            viewWrapper = new ViewWrapper(childView);
            mViewWrapper[i] = viewWrapper;
        }
    }

    /**
     * 开始动画
     */
    public void start() {
        if (mViewWrapper == null || mViewWrapper.length <= 0) {
            return;
        }
        startAnimtor = true;
        Random a = new Random();
        for (int i = 0; i < mViewWrapper.length; i++) {
            startAnimator(mViewWrapper[i], a.nextInt(barchartHeight));
        }
        removeCallbacks(this);
        postDelayed(this, barchartDuration);
    }

    /**
     * 停止动画
     */
    public void stop() {
        startAnimtor = false;
        for (int i = 0; i < mViewWrapper.length; i++) {
            startAnimator(mViewWrapper[i], 1);
        }
    }

    private void startAnimator(ViewWrapper viewWrapper, int height) {
        viewWrapper.mTarget.clearAnimation();
        ObjectAnimator.ofInt(viewWrapper, "height", height).setDuration(barchartDuration).start();
    }

    @Override
    public void run() {
        if (startAnimtor) {
            start();
        }
    }
    
    private static class ViewWrapper {
        public View mTarget;

        public ViewWrapper(View target) {
            mTarget = target;
        }

        public int getWidth() {
            return mTarget.getLayoutParams().width;
        }

        public void setWidth(int width) {
            mTarget.getLayoutParams().width = width;
            mTarget.requestLayout();
        }

        public int getHeight() {
            return mTarget.getLayoutParams().height;
        }

        public void setHeight(int height) {
            mTarget.getLayoutParams().height = height;
            mTarget.requestLayout();
        }
    }
}

自定义属性

    <declare-styleable name="BarChartView">
        <attr name="barchartCount" format="integer" />
        <attr name="barchartDuration" format="integer" />
        <attr name="barchartShape" format="reference" />
        <attr name="barchartHeight" format="dimension" />
        <attr name="barchartWidth" format="dimension" />
        <attr name="barcharMarginLeft" format="dimension" />
        <attr name="barcharBackColor" format="color" />
    declare-styleable>

布局文件:

<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="com.tlkg.testdemo.valueanimatordemo.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <com.tlkg.testdemo.valueanimatordemo.BarChartView
            android:id="@+id/myRealMapView"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            app:barcharMarginLeft="3dp"
            app:barchartCount="10"
            app:barchartDuration="500"
            app:barchartHeight="100dp"
            app:barchartWidth="10dp" />

        <com.tlkg.testdemo.valueanimatordemo.BarChartView
            android:id="@+id/myRealMapView1"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="#ff000000"
            app:barcharBackColor="#ffffffff"
            app:barcharMarginLeft="3dp"
            app:barchartCount="10"
            app:barchartDuration="500"
            app:barchartHeight="70dp"
            app:barchartWidth="5dp" />
    LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <com.tlkg.testdemo.valueanimatordemo.BarChartView
            android:id="@+id/myRealMapView2"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            app:barcharMarginLeft="1dp"
            app:barchartCount="50"
            app:barchartDuration="300"
            app:barchartHeight="40dp"
            app:barcharBackColor="#ff0000ff"
            app:barchartWidth="2dp" />

        <com.tlkg.testdemo.valueanimatordemo.BarChartView
            android:id="@+id/myRealMapView3"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            app:barcharMarginLeft="3dp"
            app:barchartCount="8"
            app:barchartDuration="200"
            app:barchartHeight="90dp"
            app:barchartShape="@drawable/mshape"
            app:barchartWidth="10dp" />
    LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal">

        <Button
            android:id="@+id/start"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="start" />

        <Button
            android:id="@+id/stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="stop" />
    LinearLayout>
LinearLayout>

MainActivity代码:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final BarChartView realMapView = (BarChartView) findViewById(R.id.myRealMapView);
        final BarChartView realMapView1 = (BarChartView) findViewById(R.id.myRealMapView1);
        final BarChartView realMapView2 = (BarChartView) findViewById(R.id.myRealMapView2);
        final BarChartView realMapView3 = (BarChartView) findViewById(R.id.myRealMapView3);

        findViewById(R.id.start).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                realMapView.start();
                realMapView1.start();
                realMapView2.start();
                realMapView3.start();
            }
        });

        findViewById(R.id.stop).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                realMapView.stop();
                realMapView1.stop();
                realMapView2.stop();
                realMapView3.stop();
            }
        });
    }

}

实现原理，BarChartView继承线性布局，设置水平，内容底部居中，根据初始化后的barchartCount属性添加childView,调用方法start开始属性动画。