首页 > 代码库 > 【安卓笔记】仿猎豹清理大师波浪效果
【安卓笔记】仿猎豹清理大师波浪效果
先来看效果:
实现方式----->自定义控件
核心代码:
package com.example.wavedemo1; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.os.Handler; import android.util.AttributeSet; import android.view.View; /** * @author Rowandjj * *仿猎豹清理大师波浪效果 */ public class WaterWaveView extends View { private Handler mHandler; private long c = 0L; private boolean mStarted = false; private final float f = 0.033F; private int mAlpha = 70;//透明度 private int mColor = Color.BLUE; private float mAmplitude = 6.0F; // 振幅 private final Paint mPaint = new Paint(); private float mWateLevel = 0.5F;//水高(0~1) private Path mPath; public WaterWaveView(Context paramContext) { super(paramContext); init(paramContext); } public WaterWaveView(Context paramContext, AttributeSet paramAttributeSet) { super(paramContext, paramAttributeSet); init(paramContext); } /** * 开始波动 */ public void startWave() { if (!mStarted) { this.c = 0L; mStarted = true; this.mHandler.sendEmptyMessage(0); } } private void init(Context context) { mPaint.setStrokeWidth(1.0F); mPaint.setColor(mColor); mPaint.setAlpha(mAlpha); mPath = new Path(); mHandler = new Handler() { @Override public void handleMessage(android.os.Message msg) { if (msg.what == 0) { invalidate(); if (mStarted) { //不断发消息给自己,使自己不断被重绘 mHandler.sendEmptyMessageDelayed(0, 60L); } } } }; } @Override protected void onDraw(Canvas canvas) { canvas.save(); mPaint.setAlpha(mAlpha); mPaint.setColor(mColor); // 得到控件的宽高 int width = getWidth(); int height = getHeight(); // 如果未开始(未调用startWave方法),绘制一个矩形 if ((!mStarted) || (width == 0) || (height == 0)) { canvas.drawRect(0.0F, height / 2, width, height, mPaint); return; } if (this.c >= 8388607L) { this.c = 0L; } //每次onDraw时c都会自增 this.c = (1L + this.c); float f1 = height * (1.0F - mWateLevel); int top = (int) (f1 + mAmplitude); mPath.reset(); // 绘制矩形,即水面静止时的高度 canvas.drawRect(0.0F, top, width, height, mPaint); int startX = 0; //波浪效果 while (startX < width) { int startY = (int) (f1 - mAmplitude* Math.sin(Math.PI* (2.0F * (startX + this.c * width * this.f))/ width)); canvas.drawLine(startX, startY, startX, top, mPaint); startX++; } canvas.restore(); } /** * 设置振幅 * @param amplitued */ public void setAmplitude(float amplitued) { mAmplitude = amplitued; } /** * 设置透明度 * @param alpha */ public void setWaterAlpha(float alpha) { this.mAlpha = ((int) (255.0F * alpha)); mPaint.setAlpha(this.mAlpha); } /** * 设置颜色 * @param color */ public void setColor(int color) { this.mColor = color; } /** * 设置水面高度 * @param paramFloat */ public void setWaterLevel(float paramFloat) { mWateLevel = paramFloat; } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); // 关闭硬件加速,防止异常unsupported operation exception this.setLayerType(View.LAYER_TYPE_SOFTWARE, null); } }
向普通控件一样,在布局文件中配置:
<com.example.wavedemo1.WaterWaveView android:id="@+id/wav" android:layout_width="match_parent" android:layout_height="match_parent" />
然后在代码中通过调用startWave方法使水面开始波动,同时可以调用set方法控制其属性。
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