Android自定義WaveView實現波浪進度效果

實現原理

首先就是自定義個WaveView 繼承View,然後再WaveView 內部實現代碼邏輯：

      ① 水波就波嘛？ sin函數？ 貝塞爾曲線？ 都行，這裡就用二階貝塞 爾曲線去畫吧

      ② 波要動嘛，怎麼動呢？線程？ 好吧 這裡用了個Handler。

      ③繪制波首先要找點，那麼在onMeasure()裡找出需要的點咯，這裡就暫時展示一個波段吧，一個波長移動左邊不就沒了？OK 那就兩個波吧，吼吼，兩個波（猥瑣男潛質表露無遺啊）。接下來就是Handler 結合 onDraw()繪制。OK，那就先看我Word繪制的粗癟的波動圖，請看VCR，oh，no... gif

意思就是波平移一個波長之後回到初始位置繼續平移循環。

好吧，有人說了，這麼簡單的邏輯你要啰嗦那麼多？？？

好吧，我承認，我有唐僧的潛質。。。

閒話就不說了，先上

效果圖

示例代碼如下

調用的Activity

 * Created by LiuDong on 2016/12/22.
 * Email:[email protected]
 */

public class WaveActivity extends Activity {
 LD_WaveView waveView;//方形
 LD_WaveView waveCircleView;//圓形
 private int progrees=0;//進度
 private Handler mHandler=new Handler(){
  @Override
  public void handleMessage(Message msg) {
   if (progrees==100) progrees=0;
   Log.i("progress",progrees+"");
   waveView.setmProgress(progrees++);
   waveCircleView.setmProgress(progrees++);
   mHandler.sendEmptyMessageDelayed(0,100);
  }
 };
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_wave);
  waveView= (LD_WaveView) findViewById(R.id.waveView);
  waveCircleView= (LD_WaveView) findViewById(R.id.waveViewCircle);
  mHandler.sendEmptyMessageDelayed(0,10);
 }
}

xml布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:orientation="vertical" android:layout_width="match_parent"
 android:background="@color/ld_White"
 android:layout_height="match_parent">
 <com.dadong.ld_tools.widget.LD_WaveView
  android:id="@+id/waveViewCircle"
  android:layout_marginTop="20dp"
  android:layout_width="100dp"
  android:layout_centerHorizontal="true"
  android:layout_height="100dp"
  app:wave_color="@color/ld_Black"
  app:wave_circle="true"
  />
 <com.dadong.ld_tools.widget.LD_WaveView
  android:id="@+id/waveView"
  android:layout_width="100dp"
  android:layout_height="100dp"
  app:wave_color="@color/ld_Black"
  app:wave_circle="false"
  android:layout_centerInParent="true" />
</RelativeLayout>

自定義WaveView

/**
 * Created by LiuDong on 2016/12/23.
 * Email:[email protected]
 */

public class LD_WaveView extends View {

 private int mProgress;//進度
 private int mTimeStep = 10;//時間間隔
 private int mSpeed = 5;//波單次移動的距離
 private int mViewHeight;//視圖寬高
 private int mViewWidth;//視圖寬度
 private int mLevelLine;// 基准線


 private int mWaveLength;//波長 暫定view寬度為一個波長
 private int mStrokeWidth;//園的線寬
 private RectF rectF;//圓環區域
 private int mWaveHeight;//波峰高度
 private int mLeftWaveMoveLength;//波平移的距離，用來控制波的起點位置
 private int mWaveColor;//波的顏色
 private Paint mPaint;//畫筆
 private Paint mCirclePaint;//圓環畫筆
 private Paint mBorderPaint;//邊界畫筆
 private int mBorderWidth=4;//邊界寬度
 private Paint mTextPaint;//文字畫筆
 private Path mPath;//繪畫線
 private List<Point> mPoints;//點的集合
 private boolean isMeasure = false;//是否已測量過
 private boolean isCircle=false;//是否圓形默認false，可屬性代碼設置
 //處理消息
 private Handler handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {

   initWaveMove();
  }
 };

 /**
  * 初始化波的移動
  */
 private void initWaveMove(){
  mLeftWaveMoveLength+=mSpeed;//波向右移動距離增加mSpeed;
  if (mLeftWaveMoveLength>=mWaveLength){//當增加到一個波長時回復到0
   mLeftWaveMoveLength=0;
  }
  invalidate();

 }
 public LD_WaveView(Context context) {
  this(context, null);
 }

 public LD_WaveView(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public LD_WaveView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);

  getAttr(context, attrs, defStyleAttr);
  init();

 }

 /**
  * 初始化畫筆
  */
 private void init() {
  mPoints = new ArrayList<Point>();
  //波浪軌跡畫筆
  mPaint = new Paint();
  mPaint.setAntiAlias(true);
  mPaint.setColor(mWaveColor);
  mPaint.setStyle(Paint.Style.FILL_AND_STROKE);


  mPath = new Path();


  //文字畫筆
  mTextPaint=new Paint();
  mTextPaint.setColor(Color.RED);
  mTextPaint.setTextAlign(Paint.Align.CENTER);
  mTextPaint.setTextSize(48);


  //圓環畫筆
  mCirclePaint=new Paint();
  mCirclePaint.setAntiAlias(true);
  mCirclePaint.setColor(Color.WHITE);
  mCirclePaint.setStyle(Paint.Style.STROKE);
  //邊界線畫筆
  mBorderPaint=new Paint();
  mBorderPaint.setAntiAlias(true);
  mBorderPaint.setColor(mWaveColor);
  mBorderPaint.setStrokeWidth(mBorderWidth);
  mBorderPaint.setStyle(Paint.Style.STROKE);


 }

 /**
  * 獲取自定義的屬性值
  *
  * @param attrs
  */
 private void getAttr(Context context, AttributeSet attrs, int defStyle) {

  TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LD_WaveView, defStyle, 0);

  mWaveColor = a.getColor(R.styleable.LD_WaveView_wave_color, Color.RED);
  isCircle=a.getBoolean(R.styleable.LD_WaveView_wave_circle,false);
  a.recycle();

 }


 /**
  *
  * @param widthMeasureSpec
  * @param heightMeasureSpec
  */
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  if (!isMeasure&&Math.abs(getMeasuredHeight()-getMeasuredWidth())<50) {//只計算一次就夠了 ，relativelayout的時候要繪制兩次 加個寬高判斷
   mViewHeight = getMeasuredHeight();
   mViewWidth = getMeasuredWidth();
   mLevelLine = mViewHeight; //初始化波的准位線  起始位視圖最底部
   {
    mLevelLine = mViewHeight * (100-mProgress) / 100;
    if (mLevelLine < 0) mLevelLine = 0;
   }
   //計算波峰值
   mWaveHeight = mViewHeight / 20;//波峰暫定為view高度的1/20，如果需要設置 可設置set方法賦值;
   mWaveLength = getMeasuredWidth();

   //計算所有的點 這裡取寬度為整個波長 往左再延伸一個波長 兩個波長則需要9個點
   for (int i = 0; i < 9; i++) {
    int y = 0;
    switch (i % 4) {
     case 0:
      y = mViewHeight;
      break;
     case 1:
      y =mViewHeight+ mWaveHeight;
      break;
     case 2:
      y = mViewHeight;
      break;
     case 3:
      y = mViewHeight-mWaveHeight;
      break;
    }
    Point point = new Point(-mWaveLength + i * mWaveLength / 4, y);
    mPoints.add(point);
   }
   /**
    * 計算圓環寬度
    */
   int mIncircleRadius=mViewHeight<mViewWidth?mViewHeight/2:mViewWidth/2;//內切圓半徑

   int mcircumcircleRadius= (int) (Math.sqrt((float)(Math.pow(mViewHeight/2,2)+Math.pow(mViewWidth/2,2)))+0.5);//外接圓半徑
   int radius=mcircumcircleRadius/2+mIncircleRadius/2;

   rectF=new RectF(mViewWidth/2-radius,mViewHeight/2-radius,mViewWidth/2+radius,mViewHeight/2+radius);
   mStrokeWidth=mcircumcircleRadius-mIncircleRadius;
   mCirclePaint.setStrokeWidth(mStrokeWidth);//線是有寬度的 采用了這種方式畫圓環
   isMeasure = true;
  }
 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  /**
   * 繪制線條
   */
  mPath.reset();
  int i = 0;
  mPath.moveTo(mPoints.get(0).getX()+mLeftWaveMoveLength, mPoints.get(0).getY()-mViewHeight*mProgress/100);
  for (; i < mPoints.size() - 2; i += 2) {
   mPath.quadTo(mPoints.get(i + 1).getX()+mLeftWaveMoveLength, mPoints.get(i + 1).getY()-mViewHeight*mProgress/100, mPoints.get(i + 2).getX()+mLeftWaveMoveLength, mPoints.get(i + 2).getY()-mViewHeight*mProgress/100);
  }
  mPath.lineTo(mPoints.get(i).getX()+mLeftWaveMoveLength, mViewHeight);
  mPath.lineTo(mPoints.get(0).getX()+mLeftWaveMoveLength, mViewHeight);
  mPath.close();
  /**
   * 繪制軌跡
   */
  canvas.drawPath(mPath,mPaint);
  Rect rect = new Rect();

  String progress=String.format("%d%%",mProgress);
  mTextPaint.getTextBounds(progress,0,progress.length(), rect);
  int textHeight = rect.height();
  if (mProgress>=50)//如果進度達到50 顏色變為白色，沒辦法啊，進度在中間 不變顏色看不到
   mTextPaint.setColor(Color.WHITE);
  else
  mTextPaint.setColor(mWaveColor);
  canvas.drawText(progress,0,progress.length(),mViewWidth/2,mViewHeight/2+textHeight/2,mTextPaint);

  if (isCircle) {
   /**
    * 繪制圓環
    */

   canvas.drawArc(rectF, 0, 360, true, mCirclePaint);
   Paint circlePaint = new Paint();
   circlePaint.setStrokeWidth(5);
   circlePaint.setColor(Color.WHITE);
   circlePaint.setAntiAlias(true);
   circlePaint.setStyle(Paint.Style.STROKE);
   canvas.drawCircle(mViewWidth / 2, mViewHeight / 2, mViewHeight / 2, circlePaint);
   /**
    * 繪制邊界
    */

   mBorderPaint.setStrokeWidth(mBorderWidth/2);
  canvas.drawCircle(mViewWidth/2,mViewHeight/2,mViewHeight/2-mBorderWidth/2,mBorderPaint);
  }else {
   /**
    * 繪制矩形邊框
    */
   canvas.drawRect(0,0,mViewWidth,mViewHeight,mBorderPaint);
  }
  //
  handler.sendEmptyMessageDelayed(0,mTimeStep);
 }

 /**
  * 設置進度 基准線
  * @param mProgress
  */
 public void setmProgress(int mProgress) {
  this.mProgress = mProgress;
  mLevelLine=(100-mProgress)*mViewHeight/100;
 }

 /**
  * 設置是否為圓形
  * @param circle
  */
 public void setCircle(boolean circle) {
  isCircle = circle;
 }
}

自定義屬性

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="LD_WaveView">
  <attr name="wave_color" format="color"></attr>
  <attr name="wave_circle" format="boolean"></attr>
 </declare-styleable>
</resources>

總結

好了，以上就是這篇文章的全部內容了，代碼裡備注應該還算比較清楚了，希望能對一些人有一些幫助,瑕疵不足之處歡迎指正，或者有好的建議。也可以留言交流。