1.自定義View畫鐘實現轉動
這個和畫圓差不多，不過只是價格分針，并實現其轉動，要加一個線程。代碼如下：
Java類中的代碼

package com.example.ll.canvas;import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Message; import android.support.annotation.Nullable; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View;import java.util.logging.Handler;/*** Created by ll on 2018/3/30.*/public class CircleView extends View {private Paint paint = new Paint();private int sec;//主線程更新Ui（os下的Handler）private android.os.Handler handler = new android.os.Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);//重新調用onDraw方法invalidate();}};public CircleView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//大圓的顏色是藍色paint.setColor(Color.BLUE);//設置抗鋸齒paint.setAntiAlias(true);//圓不是填充的，是描邊paint.setStyle(Paint.Style.STROKE); // //畫筆邊的寬度 // paint.setStrokeWidth(10);//大圓與小圓的畫出canvas.drawCircle(getWidth() / 2, getHeight() / 2, getHeight() / 4, paint);canvas.drawCircle(getWidth() / 2, getHeight() / 2, getHeight() / 80, paint);//利用循環將1到12的數字填寫到表上for (int i = 1; i <= 12; i++) {//保存畫布canvas.save();//旋轉角度，旋轉中心的設置canvas.rotate(360 / 12 * i, getWidth() / 2, getHeight() / 2);//數字大小的設置paint.setTextSize(40);//旋轉的設置canvas.drawText(String.valueOf(i), getWidth() / 2 - 15, getHeight() / 2 - getHeight() / 4 + 60, paint);//刻度表（橫線）的描寫。參數意思：開始的X坐標，結束的X坐標，開始的Y坐標，結束的Y坐標，畫筆（paint）canvas.drawLine(getWidth() / 2, getHeight() / 2 - getHeight() / 4, getWidth() / 2, getHeight() / 2 - getHeight() / 4 + 30, paint);//恢復原樣canvas.restore();}//保存畫布canvas.save();//旋轉角度，旋轉中心的設置canvas.rotate(6 * sec, getWidth() / 2, getHeight() / 2);//子針設置canvas.drawLine(getWidth() / 2, getHeight() / 2, getWidth() / 2, getHeight() / 2 - getHeight() / 4 + 100, paint);//恢復原樣canvas.restore();}//點擊事件（點一下，子針開始轉）@Overridepublic boolean onTouchEvent(MotionEvent event) {new Thread(new Runnable() {@Override//子線程做讀秒的耗時操作public void run() {//讓子針不止轉一次while (true) {//子針角度轉變次數進行自加sec++;try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}//子線程發出消息讓主線程捕獲消息handler.sendEmptyMessage(sec);}}}).start();return super.onTouchEvent(event);} }

xml中的代碼

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.ll.canvas.CircleActivity"><com.example.ll.canvas.CircleView android:layout_width="match_parent"android:layout_height="match_parent" /></android.support.constraint.ConstraintLayout>

效果圖如下:

總結

以上是生活随笔為你收集整理的安卓自定义View画钟实现转动的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。