版本：1.0
日期：2014.7.29 2014.7.30
版权：© 2014 kince 转载注明出处
一键清理是很多Launcher都会带有的功能，其效果也比较美观。实现方式也许有很多中，其中常见的是使用图片drawable来完成的，具体可以参考这篇文章：模仿实现360桌面水晶球式的一键清理特效。本文另辟蹊径，使用自定义View来完成同样的效果，性能、效率更高。
ProgressWheel相信很多人并不陌生，我参考了其中一些代码。有意思的是，看完它的代码，发现其中隐藏了没有使用的矩形进度条，因为项目名字的原因我估计也永远不会出现了吧。所以就在其基础之上增增改改，形成了ProgressRectangle。为了节省时间，第一版本并没有使用自定义的属性，这个以后再添加吧，毕竟有些鸡肋。代码如下：
/*** */package com.kince.progressrectangle;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.graphics.Paint.Style;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.util.Log;import android.view.View;/*** @author kince* @category 仿solo桌面内存清理效果* @since 2014.7.30* @version 1.0.0* [email protected] }* */public class ProgressRectangle extends View { // Sizes (with defaults) private int layout_height = 0; private int layout_width = 0; // Colors (with defaults) private int bgColor = Color.TRANSPARENT; private int progressColor = 0xFF339933; // Paints private Paint progressPaint = new Paint(); private Paint bgPaint = new Paint(); private Paint titlePaint = new Paint(); private Paint usePaint = new Paint(); // Rectangles private RectF rectBgBounds = new RectF(); private RectF rectProgressBounds = new RectF(); int progress = 100; boolean isProgress; private Handler spinHandler = new Handler() { /** * This is the code that will increment the progress variable and so * spin the wheel */ @Override public void handleMessage(Message msg) { invalidate(); // super.handleMessage(msg); } }; /** * @param context */ public ProgressRectangle(Context context) { super(context); // TODO Auto-generated constructor stub } /** * @param context * @param attrs */ public ProgressRectangle(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub } /** * @param context * @param attrs * @param defStyleAttr */ public ProgressRectangle(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); // TODO Auto-generated constructor stub } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { // TODO Auto-generated method stub super.onSizeChanged(w, h, oldw, oldh); // Share the dimensions layout_width = w; Log.i("layout_width", layout_width + ""); layout_height = h; Log.i("layout_height", layout_height + ""); setupBounds(); setupPaints(); invalidate(); } private void setupPaints() { // TODO Auto-generated method stub bgPaint.setColor(bgColor); bgPaint.setAntiAlias(true); bgPaint.setStyle(Style.FILL); progressPaint.setColor(progressColor); progressPaint.setAntiAlias(true); progressPaint.setStyle(Style.FILL); titlePaint.setColor(Color.WHITE); titlePaint.setTextSize(20); titlePaint.setAntiAlias(true); titlePaint.setStyle(Style.FILL); usePaint.setColor(Color.WHITE); usePaint.setAntiAlias(true); usePaint.setTextSize(30); usePaint.setStyle(Style.FILL); } private void setupBounds() { // TODO Auto-generated method stub int width = getWidth(); // this.getLayoutParams().width; Log.i("width", width + ""); int height = getHeight(); // this.getLayoutParams().height; Log.i("height", height + ""); rectBgBounds = new RectF(0, 0, width, height); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); canvas.drawRect(rectBgBounds, bgPaint); Log.i("progress", progress + ""); rectProgressBounds = new RectF(0, 0, progress, layout_height); canvas.drawRect(rectProgressBounds, progressPaint); canvas.drawText("使用内存", 25, 25, titlePaint); canvas.drawText(progress + "M" + "/1024M", 25, 60, usePaint); } /** * Increment the progress by 1 (of 100) */ public void incrementProgress() { isProgress = true; progress++; if (progress > 200) progress = 100; // setText(Math.round(((float) progress / 360) * 100) + "%"); spinHandler.sendEmptyMessage(0); } /** * Increment the progress by 1 (of 100) */ public void unIncrementProgress() { isProgress = true; progress--; if (progress < 1) progress = 100; // setText(Math.round(((float) progress / 360) * 100) + "%"); spinHandler.sendEmptyMessage(0); } /** * Set the progress to a specific value */ public void setProgress(int i) { progress = i; spinHandler.sendEmptyMessage(0); }}
实现思路也是很简单的，就是在onDraw()方法里面绘制进度条的背景以及进度，进度的参数是传递进来的数值。Activity的代码如下：
package com.kince.progressrectangle;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class RecActivity extends Activity { boolean running; int progress = 0; ProgressRectangle progressRectangle; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_rec); progressRectangle=(ProgressRectangle) findViewById(R.id.progressBar); final Runnable r = new Runnable() { public void run() { running = true; while(progress<100) { progressRectangle.incrementProgress(); progress++; try { Thread.sleep(15); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } while(progress>0) { progressRectangle.unIncrementProgress(); progress--; try { Thread.sleep(15); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } running = false; } }; Button increment = (Button) findViewById(R.id.btn_increment); increment.setOnClickListener(new OnClickListener() { public void onClick(View v) { if(!running) { progress = 0; Thread s = new Thread(r); s.start(); } } }); }} 效果如下：
总体来说，就是通过绘制矩形来达到目的。当然，在实际使用中的效果还是有所差异的，欢迎大家反馈、交流。
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csdn下载：http://download.csdn.net/detail/wangjinyu501/7694607
gitub地址：https://github.com/wangjinyu501/ProgressRectangle
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