[移动开发]Android记录9--实现转盘效果，app架构设计

<com.wwj.turnplate.TurnPlateView

android:id="@+id/turnplate"

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_centerInParent=“true”

/>

<Button

android:id="@+id/btnStart"

android:layout_width=“70dp”

android:layout_height=“wrap_content”

android:layout_alignParentBottom=“true”

android:layout_alignParentLeft=“true”

android:text=“开始” />

<Button

android:id="@+id/btnStop"

android:layout_width=“70dp”

android:layout_height=“wrap_content”

android:layout_alignParentBottom=“true”

android:layout_alignParentRight=“true”

android:text=“结束” />

自定义View

/2013.10.16_TurnPlate_Demo/src/com/wwj/turnplate/TurnPlateView.java

package com.wwj.turnplate;

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;

public class TurnPlateView extends View implements Runnable{

// 界面需要的图片

private Bitmap turnPlatePic; // 转盘图片

private Bitmap pointerPic; // 指针图片

// 旋转矩阵

private Matrix panRotate = new Matrix();

// 平移矩阵

private Matrix pointerTranslate = new Matrix();

private int x = 0;

private boolean ifRoate = false;

public TurnPlateView(Context context, AttributeSet attrs) {

super(context, attrs);

Resources r = context.getResources();

// 生成图片

turnPlatePic = BitmapFactory.decodeStream(r.openRawResource(R.drawable.turnplate));

pointerPic = BitmapFactory.decodeStream(r.openRawResource(R.drawable.pointer));

// 用线程刷新界面

Thread thread = new Thread(this);

thread.start();

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

canvas.translate(75, 100);

canvas.drawBitmap(turnPlatePic, panRotate, null);

canvas.translate(turnPlatePic.getWidth() / 2 - pointerPic.getWidth() / 2, 20);

canvas.rotate(x, pointerPic.getWidth() / 2,point

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erPic.getHeight() - 35);

canvas.drawBitmap(pointerPic, pointerTranslate, null);

}

@Override

public void run() {

try {

while(true) {

if (ifRoate) {

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 startRoate() {

this.ifRoate = true;

}

public void stopRotate() {

this.ifRoate = false;

}

}

主Activity

package com.wwj.turnplate;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{

private TurnPlateView plateView;