Android使用自定义View实现360手机卫士波浪球进度的效果

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：

<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>

（3）如何使用自定义波浪View：

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();
 }
}

最后，照例，给出源码地址

真题园网

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