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這篇文章將為大家詳細(xì)講解有關(guān)怎么在Android中自定義控件實現(xiàn)時鐘效果,文章內(nèi)容質(zhì)量較高,因此小編分享給大家做個參考,希望大家閱讀完這篇文章后對相關(guān)知識有一定的了解。
自定義控件的代碼:
public class ClockView extends View{ private Paint circlePaint,dialPaint,numberPaint; //view 的寬高 private float mWidth,mHeight; //圓的半徑 private float circleRadius; //圓心X,Y坐標(biāo) private float circleX,circleY; private int second,minute; private double hour; private Handler handler = new Handler(Looper.getMainLooper()){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); if(msg.what==0){ invalidate(); } } }; public ClockView(Context context, AttributeSet attrs) { super(context, attrs); initPaint(); } private void initPaint(){ //刻盤圓,小時刻度,時針和分針的畫筆 circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG); circlePaint.setColor(Color.BLACK); circlePaint.setStyle(Paint.Style.STROKE); circlePaint.setStrokeWidth(10); //分鐘刻度的畫筆 dialPaint = new Paint(Paint.ANTI_ALIAS_FLAG); dialPaint.setColor(Color.BLACK); dialPaint.setStrokeWidth(5); //數(shù)字的畫筆 numberPaint = new Paint(Paint.ANTI_ALIAS_FLAG); numberPaint.setColor(Color.BLACK); numberPaint.setStrokeWidth(5); numberPaint.setTextSize(30); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); if(mWidth<mHeight){ //圓的半徑為view的寬度的一半再減9,防止貼邊 circleRadius = mWidth/2-9; circleX = mWidth/2; circleY = mHeight/2; } else{ circleRadius = mHeight/2-9; circleX = mWidth/2; circleY = mHeight/2; } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); setTimes(); drawCirclePoint(canvas); drawCircle(canvas); drawDial(canvas); drawPointer(canvas); } /**圓心 * @param canvas */ private void drawCirclePoint(Canvas canvas){ canvas.drawCircle(circleX,circleY,5,circlePaint); } private void drawCircle(Canvas canvas){ canvas.drawCircle(circleX,circleY,circleRadius,circlePaint); } /**畫刻度及時間 * @param canvas */ private void drawDial(Canvas canvas){ //時鐘用長一點的刻度,畫筆用畫圓的畫筆 Point hourStartPoint = new Point(circleX,circleY-circleRadius); Point hourEndPoint = new Point(circleX,circleY-circleRadius+40); //分鐘的刻度要稍微短一些,畫筆用畫圓的畫筆 Point startPoint2 = new Point(circleX,circleY-circleRadius); Point endPoint2 = new Point(circleX,circleY-circleRadius+10); //開始畫刻度和數(shù)字,總共60個刻度,12個時鐘刻度,被5整除畫一個時鐘刻度,被其余的為分針刻度 String clockNumber; for(int i=0;i<60;i++){ if(i%5==0){ if(i==0){ clockNumber = "12"; } else{ clockNumber = String.valueOf(i/5); } //時針刻度 canvas.drawLine(hourStartPoint.getX(),hourStartPoint.getY(),hourEndPoint.getX(),hourEndPoint.getY(),circlePaint); //畫數(shù)字,需在時針刻度末端加30 canvas.drawText(clockNumber,circleX-numberPaint.measureText(clockNumber)/2,hourEndPoint.getY()+30,numberPaint); } else{ //畫分針刻度 canvas.drawLine(startPoint2.getX(),startPoint2.getY(),endPoint2.getX(),endPoint2.getY(),circlePaint); } //畫布旋轉(zhuǎn)6度 canvas.rotate(360/60,circleX,circleY); } } /**畫指針 * X點坐標(biāo) cos(弧度)*r * Y點坐標(biāo) sin(弧度)*r * toRadians將角度轉(zhuǎn)成弧度 * 安卓坐標(biāo)系與數(shù)學(xué)坐標(biāo)系不同的地方是X軸是相反的,所以為了調(diào)整方向,需要將角度+270度 * @param canvas */ private void drawPointer(Canvas canvas){ canvas.translate(circleX,circleY); float hourX = (float) Math.cos(Math.toRadians(hour*30+270))*circleRadius*0.5f; float hourY = (float) Math.sin(Math.toRadians(hour*30+270))*circleRadius*0.5f; float minuteX = (float) Math.cos(Math.toRadians(minute*6+270))*circleRadius*0.8f; float minuteY = (float) Math.sin(Math.toRadians(minute*6+270))*circleRadius*0.8f; float secondX = (float) Math.cos(Math.toRadians(second*6+270))*circleRadius*0.8f; float secondY = (float) Math.sin(Math.toRadians(second*6+270))*circleRadius*0.8f; canvas.drawLine(0,0,hourX,hourY,circlePaint); canvas.drawLine(0,0,minuteX,minuteY,circlePaint); canvas.drawLine(0,0,secondX,secondY,dialPaint); //一秒重繪一次 handler.sendEmptyMessageDelayed(0,1000); } public void startClock(){ setTimes(); invalidate(); } private void setTimes(){ Date date = new Date(); Calendar calendar = Calendar.getInstance(); calendar.setTime(date); second = getTimes(date,Calendar.SECOND); minute = getTimes(date,Calendar.MINUTE); hour = getTimes(date,Calendar.HOUR)+minute/12*0.2; } private int getTimes(Date date,int calendarField){ Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return calendar.get(calendarField); } public void stopClock(){ handler.removeMessages(0); } }
public class Point {
private float x;
private float y;
public Point(float x, float y) { this.x = x; this.y = y; } public float getX() { return x; } public void setX(float x) { this.x = x; } public float getY() { return y; } public void setY(float y) { this.y = y; }
Acitivity:
public class ClockActivity extends Activity{ private ClockView clockView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.clock_layout); clockView = (ClockView) findViewById(R.id.clock); } @Override protected void onResume() { super.onResume(); clockView.startClock(); } @Override protected void onStop() { super.onStop(); clockView.stopClock(); } }
xml布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:gravity="center" android:layout_height="match_parent"> <com.example.customview.view.ClockView android:layout_width="match_parent" android:id="@+id/clock" android:layout_height="match_parent" /> </LinearLayout>
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