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：
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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
}
}
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（2）布局文件的实现：
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
tools:context=".MainActivity" >
<com.czm.mysinkingview.MySinkingView
android:id="@+id/sinking"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" >
<ImageView
android:id="@+id/image"
android:layout_width="400dp"
android:layout_height="400dp"
android:src="@drawable/charming2" />
</com.czm.mysinkingview.MySinkingView>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:orientation="horizontal" >
<Button
android:id="@+id/btn_test"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:text="体验" />
</LinearLayout>
</RelativeLayout>
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（3）如何使用自定义波浪View：
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package com.czm.mysinkingview;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
/**
* 使用并测试用例页
*
* @author caizhiming
*/
public class MainActivity extends Activity {
private MySinkingView mSinkingView;
private float percent = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSinkingView = (MySinkingView) findViewById(R.id.sinking);
findViewById(R.id.btn_test).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
test();
}
});
percent = 0.56f;
mSinkingView.setPercent(percent);
}
private void test() {
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
percent = 0;
while (percent <= 1) {
mSinkingView.setPercent(percent);
percent += 0.01f;
try {
Thread.sleep(40);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
percent = 0.56f;
mSinkingView.setPercent(percent);
// mSinkingView.clear();
}
});
thread.start();
}
}
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最后，照例，给出源码地址
真题园网
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。
原文链接：https://www.cnblogs.com/JczmDeveloper/p/4185082.html