android下自定义View之雷达扫描 The Radar (Scanning) View on Android 当扫描到对象的时候，通过水波纹的方式显示扫描到的对象，可以动态的随机添加，并且扫描到的对象是可以点击的……

郭攀峰

Last update: Dec 1, 2022

Related tags

UI/UX RadarScanView

Overview

RadarScanView

自定义View之雷达扫描

原理

关键是使用SweepGradient进行扫描渲染关键代码如下：

        Shader shader = new SweepGradient(centerX, centerY, Color.TRANSPARENT, tailColor);
        mPaintRadar.setShader(shader);

然后旋转起来即可

        matrix.postRotate(start, centerX, centerY);

代码中包含了如何自定义一个View，怎样重写onMeasure、onSizeChanged、onDraw函数、自定义属性等等知识点

效果图

添加动态显示效果

  new Handler().postDelayed(new Runnable()
        {
            @Override
            public void run()
            {
                randomTextView.addKeyWord("彭丽媛");
                randomTextView.addKeyWord("习近平");
                randomTextView.show();
            }
        }, 2 * 1000);

添加动态发现水波效果

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Comments

PopUp Image while Radar is rotating

Is it possible to popup an Image randomly inside the circle when the radar is rotating.

I want to popup an Image whenever the timer(which will be set and will be in some seconds) elapses. The position of the Image should be just before the current position of the radar. And the Image should not touch the inner circles but can be inside them.

The Image should stay for a second and then go away and should not rotate with the radar.

Is it possible to achieve this using this library or by adding small code?

Any help/information would be really grateful.

opened by rk8339811 0

Owner

郭攀峰

经常来看看……

GitHub

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