仿360手机卫士波浪球进度的实现 – Jamy Cai

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像360卫士的波浪球进度的效果，一般最常用的方法就是画线的方式，先绘sin线或贝塞尔曲线，然后从左到右绘制竖线，然后再裁剪圆区域。

今天我这用图片bitmap的方式,大概的方法原理是：

（1）首先用clipPath裁剪园区域，

（2）然后用4张图来不断绘制到画布上，再用偏移量来控制移动的速度，从而形成波浪动态效果。

（3）有一点需要注意的是，裁剪圆的时候用到的clipPath这个方法，在android 4.1，和4.2等某些系统上，裁剪出来不是圆，而是矩形，针对这些系统需要在manifest.xml文件的activity中

将硬件加速关掉，因为默认是开启的。即添加这个：android:hardwareAccelerated=”false”

（源码在下面最后给出哈）

手机上的效果：

下面咱们就来看看怎么实现吧：

（1）自定义波浪View的实现：

package com.czm.mysinkingview;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Path.Direction;
import android.graphics.Region.Op;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.FrameLayout;
/**
* 水波浪球形进度View
* @author caizhiming
*
*/
public class MySinkingView extends FrameLayout {
private static final int DEFAULT_TEXTCOLOT = 0xFFFFFFFF;

private static final int DEFAULT_TEXTSIZE = 250;

private float mPercent;

private Paint mPaint = new Paint();

private Bitmap mBitmap;

private Bitmap mScaledBitmap;

private float mLeft, mTop;

private int mSpeed = 15;

private int mRepeatCount = 0;

private Status mFlag = Status.NONE;

private int mTextColor = DEFAULT_TEXTCOLOT;

private int mTextSize = DEFAULT_TEXTSIZE;

public MySinkingView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public void setTextColor(int color) {
mTextColor = color;
}

public void setTextSize(int size) {
mTextSize = size;
}

public void setPercent(float percent) {
mFlag = Status.RUNNING;
mPercent = percent;
postInvalidate();

}

public void setStatus(Status status) {
mFlag = status;
}

public void clear() {
mFlag = Status.NONE;
if (mScaledBitmap != null) {
mScaledBitmap.recycle();
mScaledBitmap = null;
}

if (mBitmap != null) {
mBitmap.recycle();
mBitmap = null;
}
}

@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
int width = getWidth();
int height = getHeight();

//裁剪成圆区域
Path path = new Path();
canvas.save();
path.reset();
canvas.clipPath(path);
path.addCircle(width / 2, height / 2, width / 2, Direction.CCW);
canvas.clipPath(path, Op.REPLACE);

if (mFlag == Status.RUNNING) {
if (mScaledBitmap == null) {
mBitmap = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.wave2);
mScaledBitmap = Bitmap.createScaledBitmap(mBitmap, mBitmap.getWidth(), getHeight(), false);
mBitmap.recycle();
mBitmap = null;
mRepeatCount = (int) Math.ceil(getWidth() / mScaledBitmap.getWidth() + 0.5) + 1;
}
for (int idx = 0; idx < mRepeatCount; idx++) {
canvas.drawBitmap(mScaledBitmap, mLeft + (idx – 1) * mScaledBitmap.getWidth(), (1-mPercent) * getHeight(), null);
}
String str = (int) (mPercent * 100) + “%”;
mPaint.setColor(mTextColor);
mPaint.setTextSize(mTextSize);
mPaint.setStyle(Style.FILL);
canvas.drawText(str, (getWidth() – mPaint.measureText(str)) / 2, getHeight() / 2 + mTextSize / 2, mPaint);

mLeft += mSpeed;
if (mLeft >= mScaledBitmap.getWidth())
mLeft = 0;
// 绘制外圆环
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(4);
mPaint.setAntiAlias(true);
mPaint.setColor(Color.rgb(33, 211, 39));
canvas.drawCircle(width / 2, height / 2, width / 2 – 2, mPaint);

postInvalidateDelayed(20);
}
canvas.restore();

}

public enum Status {
RUNNING, NONE
}

}

（2）布局文件的实现：

<com.czm.mysinkingview.MySinkingView
android:id=”@+id/sinking”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_centerInParent=”true” >

</LinearLayout>

</RelativeLayout>

（3）如何使用自定义波浪View：

package com.czm.mysinkingview;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Path.Direction;
import android.graphics.Region.Op;
import android.util.AttributeSet;
import android.widget.FrameLayout;
/**
* 水波浪球形进度View
* @author caizhiming
*
*/
public class MySinkingView extends FrameLayout {
private static final int DEFAULT_TEXTCOLOT = 0xFFFFFFFF;

private static final int DEFAULT_TEXTSIZE = 250;

private float mPercent;

private Paint mPaint = new Paint();

private Bitmap mBitmap;

private Bitmap mScaledBitmap;

private float mLeft;

private int mSpeed = 15;

private int mRepeatCount = 0;

private Status mFlag = Status.NONE;

private int mTextColor = DEFAULT_TEXTCOLOT;

private int mTextSize = DEFAULT_TEXTSIZE;

public MySinkingView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public void setTextColor(int color) {
mTextColor = color;
}

public void setTextSize(int size) {
mTextSize = size;
}

public void setPercent(float percent) {
mFlag = Status.RUNNING;
mPercent = percent;
postInvalidate();

}

public void setStatus(Status status) {
mFlag = status;
}

public void clear() {
mFlag = Status.NONE;
if (mScaledBitmap != null) {
mScaledBitmap.recycle();
mScaledBitmap = null;
}

if (mBitmap != null) {
mBitmap.recycle();
mBitmap = null;
}
}

@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
int width = getWidth();
int height = getHeight();

//裁剪成圆区域
Path path = new Path();
canvas.save();
path.reset();
canvas.clipPath(path);
path.addCircle(width / 2, height / 2, width / 2, Direction.CCW);
canvas.clipPath(path, Op.REPLACE);