利用Android自定义View实现转盘旋转的效果

核心提示：canvas.drawBitmap(panhandpic, panhandTrans, null);}//重写的run函数，用来控制转盘转动public void run() {try {while(true){if(ifRotate){this.x+=25;//这个函数强制UI线程刷新界面this.postInval

canvas.drawBitmap(panhandpic, panhandTrans, null);

}

//重写的run函数，用来控制转盘转动

public void run() {

try {

while(true){

if(ifRotate){

this.x+=25;

//这个函数强制UI线程刷新界面

this.postInvalidate();

Thread.sleep(50);

}

}

} catch (InterruptedException e) {

e.printStackTrace();

}

}

public void startRotate(){

this.ifRotate=true;

}

public void stopRotate(){

this.ifRotate=false;

}

}

package com.test.www;

import android.content.Context;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.util.AttributeSet;

import android.view.View;

//自定义的转盘View

public class zhuanpanView extends View implements Runnable{

//界面需要的图片

private Bitmap panpic;

private Bitmap panhandpic;

//旋转矩阵

private Matrix panRotate=new Matrix();

//平移矩阵

private Matrix panhandTrans=new Matrix();

private int x=0;

private boolean ifRotate=false;

public zhuanpanView(Context context, AttributeSet attrs) {

super(context, attrs);

Resources r=context.getResources();

//设置指针平移矩阵为按向量(160,160-指针的高度)平移

panhandTrans.setTranslate(160, 160-76);

//生成图片

panpic=BitmapFactory.decodeStream(r.openRawResource(R.drawable.pan));

panhandpic=BitmapFactory.decodeStream(r.openRawResource(R.drawable.panhand));

//用线程来刷新界面

Thread thread=new Thread(this);