实例介绍
【实例截图】
【核心代码】
package demo.wez.com.radar.view; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Shader; import android.graphics.SweepGradient; import android.graphics.drawable.BitmapDrawable; import android.os.Handler; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.widget.Toast; import java.util.HashMap; import java.util.Map; import demo.wez.com.radar.R; /** * 类名:RadarView * 作者:wangenzhao * 时间:2016/6/9 */ public class RadarView extends View { private final Context context; int w, h;//屏幕宽高 int screen_center_x, screen_center_y; Paint mEmptyCirclePaint = null; private Bitmap profilePic = null; int imageHalfWidth; private Paint mGradientCirelePaint = null;//带渐变效果的笔 Handler handler = new Handler(); int degree = 0; Matrix rotate_matrix; Runnable rotetaRun = new Runnable() { @Override public void run() { rotate_matrix.postRotate( degree, screen_center_x, screen_center_y); RadarView.this.invalidate(); handler.postDelayed(rotetaRun, 50); } }; public RadarView(Context context, AttributeSet attrs) { super(context, attrs); this.context = context; w = context.getResources().getDisplayMetrics().widthPixels; h = context.getResources().getDisplayMetrics().heightPixels; screen_center_x = w / 2; screen_center_y = h / 2; setBackgroundResource(R.drawable.alv); initPaint(); rotate_matrix = new Matrix(); handler.post(rotetaRun); } private void initPaint() { mEmptyCirclePaint = new Paint(); mEmptyCirclePaint.setColor(Color.parseColor("#A1A1A1")); mEmptyCirclePaint.setStrokeWidth(3); // mEmptyCirclePaint.setAntiAlias(true); mEmptyCirclePaint.setStyle(Paint.Style.STROKE); //渐变效果的笔 mGradientCirelePaint = new Paint(); // mGradientCirelePaint.setColor(Color.parseColor("#743892")); Shader mShader = new SweepGradient(screen_center_x, screen_center_y, Color.TRANSPARENT, Color.parseColor("#AAAAAAAA")); mGradientCirelePaint.setShader(mShader); mGradientCirelePaint.setAntiAlias(true); //获取头像 profilePic = ((BitmapDrawable) getResources().getDrawable(R.drawable.center)).getBitmap(); //矩阵 Matrix matrix = new Matrix(); imageHalfWidth = 4 * (w / 6) / 5; //计算比例 float sx = (float)2 * imageHalfWidth/profilePic.getWidth(); float sy = (float)2 * imageHalfWidth/profilePic.getHeight(); matrix.setScale(sx, sy); //进行压缩 profilePic = Bitmap.createBitmap(profilePic, 0, 0, profilePic.getWidth(), profilePic.getHeight(), matrix, false); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //画圆 canvas.drawCircle(screen_center_x, screen_center_y, w / 6, mEmptyCirclePaint); canvas.drawCircle(screen_center_x, screen_center_y, w / 3, mEmptyCirclePaint); canvas.drawCircle(screen_center_x, screen_center_y, 11 * w / 20, mEmptyCirclePaint); canvas.drawCircle(screen_center_x, screen_center_y, 7 * h / 16, mEmptyCirclePaint); //画头像 canvas.drawBitmap(profilePic, screen_center_x - imageHalfWidth, screen_center_y - imageHalfWidth, null); if (waves != null && waves.keySet().size() > 0) { for (String n : waves.keySet()) { if (waves.get(n) != null) { Wave wave = waves.get(n); canvas.drawCircle(wave.cx, wave.cy, wave.currentRadius, wave.mPaint); } } } //drawing gradient circle canvas.concat(rotate_matrix); canvas.drawCircle(screen_center_x, screen_center_y, 7 * h / 16, mGradientCirelePaint); rotate_matrix.reset(); } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { int x = (int) event.getX(); int y = (int) event.getY(); launchingSingleWave(x, y); } return super.onTouchEvent(event); } Map<String, Wave> waves; private void launchingSingleWave(int x, int y) { final Wave tmp = new Wave(x, y, 7 * h / 16, 0, 0, Color.parseColor("#22ffffff")); if (waves == null) { waves = new HashMap<>(); } final String tag = "" System.currentTimeMillis(); waves.put(tag, tmp); Runnable waveRun = new Runnable() { @Override public void run() { if (tmp.currentRadius < tmp.maxRadius) { //圆圈扩大 tmp.currentRadius = 10; //透明度增加 int diff = tmp.maxRadius - tmp.startRadius; tmp.mPaint.setAlpha((tmp.maxRadius - tmp.currentRadius) * 100 / diff); handler.postDelayed(this, 10); } else { waves.put(tag, null); } } }; waveRun.run(); } }
标签: 声波及点击水波纹
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