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效果图
示例代码
Activity 代码
public class ShapeDrawableActivity extends AppCompatActivity { private ImageView ivLightbeam; private ObjectAnimator radarScanAnim; // 扫描动画 private int width; private int height; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_shape_drawable); ivLightbeam = (ImageView) findViewById(R.id.ivLightbeam); } @Override protected void onResume() { super.onResume(); startScan(); } @Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); if (height == 0 || width == 0) { //获取屏幕长、宽 width = ScreenUtils.getScreenWidth(this); height = ScreenUtils.getScreenHeight(this); //根据屏幕长、宽计算扫描圆的直径 int diameter = (int) Math.sqrt(Math.pow(height, 2) + Math.pow(width, 2)); //修改光束的大小,使光束可以扫描到整个屏幕 FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(diameter, diameter); ivLightbeam.setLayoutParams(layoutParams); //将扫描光束的中心移至屏幕内容中心 int offsetX = (width - diameter) / 2; int offsetY = (height - diameter) / 2 + ScreenUtils.getStatusHeight(this) / 2; ivLightbeam.setX(offsetX); ivLightbeam.setY(offsetY); } } @Override protected void onPause() { super.onPause(); stopScan(); } // 开始扫描 private void startScan() { radarScanAnim = ObjectAnimator.ofFloat(ivLightbeam, "rotation", 0f, 360f); radarScanAnim.setDuration(2000); //2秒扫描一圈 radarScanAnim.setInterpolator(new LinearInterpolator()); radarScanAnim.setRepeatCount(ObjectAnimator.INFINITE);//循环扫描 ivLightbeam.setVisibility(View.VISIBLE); radarScanAnim.start(); } // 停止扫描 private void stopScan() { ivLightbeam.setVisibility(View.GONE); radarScanAnim.end(); } }