Android特效专辑（十一）——仿水波纹流球进度条控制器，实现高端大气的主流特效
今天看到一个效果挺不错的，就模仿了下来，加上了一些自己想要的效果，感觉还不错的样子，所以就分享出来了，话不多说，上图
截图
CircleView
这里主要是实现中心圆以及水波特效
package com.lgl.circleview;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.RectF;import android.os.Handler;import android.os.Parcel;import android.os.Parcelable;import android.util.AttributeSet;import android.view.View;import android.widget.ProgressBar;/** * 水波圆 * * @author lgl * */public class CircleView extends View { private Context mContext; private int mScreenWidth; private int mScreenHeight; private Paint mRingPaint; private Paint mCirclePaint; private Paint mWavePaint; private Paint linePaint; private Paint flowPaint; private Paint leftPaint; private int mRingSTROKEWidth = 15; private int mCircleSTROKEWidth = 2; private int mLineSTROKEWidth = 1; private int mCircleColor = Color.WHITE; private int mRingColor = Color.WHITE; private int mWaveColor = Color.WHITE; private Handler mHandler; private long c = 0L; private boolean mStarted = false; private final float f = 0.033F; private int mAlpha = 50;// 透明度 private float mAmplitude = 10.0F; // 振幅 private float mWaterLevel = 0.5F;// 水高(0~1) private Path mPath; // 绘制文字显示在圆形中间，只是我没有设置，我觉得写在布局上也挺好的 private String flowNum = ""; private String flowLeft = "还剩余"; /** * @param context */ public CircleView(Context context) { super(context); // TODO Auto-generated constructor stub mContext = context; init(mContext); } /** * @param context * @param attrs */ public CircleView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub mContext = context; init(mContext); } /** * @param context * @param attrs * @param defStyleAttr */ public CircleView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); // TODO Auto-generated constructor stub mContext = context; init(mContext); } public void setmWaterLevel(float mWaterLevel) { this.mWaterLevel = mWaterLevel; } private void init(Context context) { mRingPaint = new Paint(); mRingPaint.setColor(mRingColor); mRingPaint.setAlpha(50); mRingPaint.setStyle(Paint.Style.STROKE); mRingPaint.setAntiAlias(true); mRingPaint.setStrokeWidth(mRingSTROKEWidth); mCirclePaint = new Paint(); mCirclePaint.setColor(mCircleColor); mCirclePaint.setStyle(Paint.Style.STROKE); mCirclePaint.setAntiAlias(true); mCirclePaint.setStrokeWidth(mCircleSTROKEWidth); linePaint = new Paint(); linePaint.setColor(mCircleColor); linePaint.setStyle(Paint.Style.STROKE); linePaint.setAntiAlias(true); linePaint.setStrokeWidth(mLineSTROKEWidth); flowPaint = new Paint(); flowPaint.setColor(mCircleColor); flowPaint.setStyle(Paint.Style.FILL); flowPaint.setAntiAlias(true); flowPaint.setTextSize(36); leftPaint = new Paint(); leftPaint.setColor(mCircleColor); leftPaint.setStyle(Paint.Style.FILL); leftPaint.setAntiAlias(true); leftPaint.setTextSize(36); mWavePaint = new Paint(); mWavePaint.setStrokeWidth(1.0F); mWavePaint.setColor(mWaveColor); mWavePaint.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 onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int width = measure(widthMeasureSpec, true); int height = measure(heightMeasureSpec, false); if (width < height) { setMeasuredDimension(width, width); } else { setMeasuredDimension(height, height); } } /** * @category 测量 * @param measureSpec * @param isWidth * @return */ private int measure(int measureSpec, boolean isWidth) { int result; int mode = MeasureSpec.getMode(measureSpec); int size = MeasureSpec.getSize(measureSpec); int padding = isWidth ? getPaddingLeft() + getPaddingRight() : getPaddingTop() + getPaddingBottom(); if (mode == MeasureSpec.EXACTLY) { result = size; } else { result = isWidth ? getSuggestedMinimumWidth() : getSuggestedMinimumHeight(); result += padding; if (mode == MeasureSpec.AT_MOST) { if (isWidth) { result = Math.max(result, size); } else { result = Math.min(result, size); } } } return result; } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { // TODO Auto-generated method stub super.onSizeChanged(w, h, oldw, oldh); mScreenWidth = w; mScreenHeight = h; } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); // 得到控件的宽高 int width = getWidth(); int height = getHeight(); setBackgroundColor(mContext.getResources().getColor(R.color.main_bg)); // 计算当前油量线和水平中线的距离 float centerOffset = Math.abs(mScreenWidth / 2 * mWaterLevel - mScreenWidth / 4); // 计算油量线和与水平中线的角度 float horiAngle = (float) (Math.asin(centerOffset / (mScreenWidth / 4)) * 180 / Math.PI); // 扇形的起始角度和扫过角度 float startAngle, sweepAngle; if (mWaterLevel > 0.5F) { startAngle = 360F - horiAngle; sweepAngle = 180F + 2 * horiAngle; } else { startAngle = horiAngle; sweepAngle = 180F - 2 * horiAngle; } canvas.drawLine(mScreenWidth * 3 / 8, mScreenHeight * 5 / 8, mScreenWidth * 5 / 8, mScreenHeight * 5 / 8, linePaint); float num = flowPaint.measureText(flowNum); canvas.drawText(flowNum, mScreenWidth * 4 / 8 - num / 2, mScreenHeight * 4 / 8, flowPaint); float left = leftPaint.measureText(flowLeft); canvas.drawText(flowLeft, mScreenWidth * 4 / 8 - left / 2, mScreenHeight * 3 / 8, leftPaint); // 如果未开始（未调用startWave方法）,绘制一个扇形 if ((!mStarted) || (mScreenWidth == 0) || (mScreenHeight == 0)) { // 绘制,即水面静止时的高度 RectF oval = new RectF(mScreenWidth / 4, mScreenHeight / 4, mScreenWidth * 3 / 4, mScreenHeight * 3 / 4); canvas.drawArc(oval, startAngle, sweepAngle, false, mWavePaint); return; } // 绘制,即水面静止时的高度 // 绘制,即水面静止时的高度 RectF oval = new RectF(mScreenWidth / 4, mScreenHeight / 4, mScreenWidth * 3 / 4, mScreenHeight * 3 / 4); canvas.drawArc(oval, startAngle, sweepAngle, false, mWavePaint); if (this.c >= 8388607L) { this.c = 0L; } // 每次onDraw时c都会自增 c = (1L + c); float f1 = mScreenHeight * (1.0F - (0.25F + mWaterLevel / 2)) - mAmplitude; // 当前油量线的长度 float waveWidth = (float) Math.sqrt(mScreenWidth * mScreenWidth / 16 - centerOffset * centerOffset); // 与圆半径的偏移量 float offsetWidth = mScreenWidth / 4 - waveWidth; int top = (int) (f1 + mAmplitude); mPath.reset(); // 起始振动X坐标，结束振动X坐标 int startX, endX; if (mWaterLevel > 0.50F) { startX = (int) (mScreenWidth / 4 + offsetWidth); endX = (int) (mScreenWidth / 2 + mScreenWidth / 4 - offsetWidth); } else { startX = (int) (mScreenWidth / 4 + offsetWidth - mAmplitude); endX = (int) (mScreenWidth / 2 + mScreenWidth / 4 - offsetWidth + mAmplitude); } // 波浪效果 while (startX < endX) { int startY = (int) (f1 - mAmplitude * Math.sin(Math.PI * (2.0F * (startX + this.c * width * this.f)) / width)); canvas.drawLine(startX, startY, startX, top, mWavePaint); startX++; } canvas.drawCircle(mScreenWidth / 2, mScreenHeight / 2, mScreenWidth / 4 + mRingSTROKEWidth / 2, mRingPaint); canvas.drawCircle(mScreenWidth / 2, mScreenHeight / 2, mScreenWidth / 4, mCirclePaint); canvas.restore(); } @Override public Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState ss = new SavedState(superState); ss.progress = (int) c; return ss; } @Override public void onRestoreInstanceState(Parcelable state) { SavedState ss = (SavedState) state; super.onRestoreInstanceState(ss.getSuperState()); c = ss.progress; } @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); } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); } /** * @category 开始波动 */ public void startWave() { if (!mStarted) { this.c = 0L; mStarted = true; this.mHandler.sendEmptyMessage(0); } } /** * @category 停止波动 */ public void stopWave() { if (mStarted) { this.c = 0L; mStarted = false; this.mHandler.removeMessages(0); } } /** * @category 保存状态 */ static class SavedState extends BaseSavedState { int progress; /** * Constructor called from {@link ProgressBar#onSaveInstanceState()} */ SavedState(Parcelable superState) { super(superState); } /** * Constructor called from {@link #CREATOR} */ private SavedState(Parcel in) { super(in); progress = in.readInt(); } @Override public void writeToParcel(Parcel out, int flags) { super.writeToParcel(out, flags); out.writeInt(progress); } public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() { public SavedState createFromParcel(Parcel in) { return new SavedState(in); } public SavedState[] newArray(int size) { return new SavedState[size]; } }; }}我们运行一下
其实他是十分的空旷的，所以也值得我们去定制，我们在中间加个流量显示，再加个进度条
activity_main.xml
<?xml version="1.0" encoding="utf-8"?><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="@color/main_bg" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="10dp" android:text="流量" android:textColor="@android:color/white" android:textSize="18sp" /> <com.lgl.circleview.CircleView android:id="@+id/wave_view" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_centerInParent="true" /> <TextView android:id="@+id/power" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textColor="@android:color/white" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="150dp" /></RelativeLayout>我们要实现这个，就要调用它的初始化以及start方法
mCircleView = (CircleView) findViewById(R.id.wave_view); // 设置多高，float，0.1-1F mCircleView.setmWaterLevel(0.1F); // 开始执行 mCircleView.startWave();别忘了activity销毁的时候把它回收哦
@Override protected void onDestroy() { // TODO Auto-generated method stub mCircleView.stopWave(); mCircleView = null; super.onDestroy(); }我们再运行一遍
但是我们要怎么让水波纹随着进度条一起上升下降尼？，这里我们就要用到我们刚才写的SeekBar了，我们实现它的setOnSeekBarChangeListener来监听，这样我们就要复写他的三个方法，这里我们只要用到一个
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { //跟随进度条滚动 mCircleView.setmWaterLevel((float) progress / 100); }这里，我们要这样算的，我们设置高度的单位是float，也就是从0-1F，而我们的进度是int progress，从0-100，我们就要用(float) progress / 100)并且强转来得到单位，好了，我们现在水波纹的高度就是随着我们的进度条一起变化了，我们再来运行一下
好的，这样的话，我们就只剩下一个了，就是让大小随着我们的进度条变化了，这里我们因为更新UI不能再主线程中操作，所以我们需要用到我们的老伙计Handler了，但是用到handler还不够，我们的进度条数值也是在内部类里面，所以这里我们需要用到Handler来传值了，这里我们用的是Bundle,我们还是在onProgressChanged方法中操作了
//创建一个消息 Message message = new Message(); Bundle bundle = new Bundle(); //put一个int值 bundle.putInt("progress", progress); //装载 message.setData(bundle); //发送消息 handler.sendMessage(message); //创建表示 message.what = 1;消息发送过去了，我们就在前面写个Handler去接收就是了
private Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { if (msg.what == 1) { int num = msg.getData().getInt("progress"); Log.i("num", num + ""); power.setText((float) num / 100 * max + "M/" + max + "M"); } } };这里的计算公式尼，是当前的数值/100得到百分比再去*最大值。我们现在可以完整的运行一下了，其实和最上面运行的图片是一样的
MainActivity
package com.lgl.circleview;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.widget.SeekBar;import android.widget.TextView;public class MainActivity extends Activity { private CircleView mCircleView; private SeekBar mSeekBar; private TextView power; private int max = 1024; private int min = 102; private Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { if (msg.what == 1) { int num = msg.getData().getInt("progress"); Log.i("num", num + ""); power.setText((float) num / 100 * max + "M/" + max + "M"); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getActionBar().hide(); setContentView(R.layout.activity_main); power = (TextView) findViewById(R.id.power); power.setText(min + "M/" + max + "M"); mCircleView = (CircleView) findViewById(R.id.wave_view); // 设置多高，float，0.1-1F mCircleView.setmWaterLevel(0.1F); // 开始执行 mCircleView.startWave(); mSeekBar = (SeekBar) findViewById(R.id.seekBar); mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { mCircleView.setmWaterLevel((float) progress / 100); // 创建一个消息 Message message = new Message(); Bundle bundle = new Bundle(); // put一个int值 bundle.putInt("progress", progress); // 装载 message.setData(bundle); // 发送消息 handler.sendMessage(message); // 创建表示 message.what = 1; } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); } @Override protected void onDestroy() { // TODO Auto-generated method stub mCircleView.stopWave(); mCircleView = null; super.onDestroy(); }}
