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自定义控件之-----progressBar
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
寫了那一年多代碼都沒有認認真真寫過自定義控件，最近看到網易新聞里面的加載圖標如圖
感覺很有意思，就準備自己寫個玩玩。在api里面腦補了一些canvas的姿勢，就上了，效果如下。
說實話真心不難，自定義控件比起平時做的應用多了幾分自由和創作的快感，可能我應該去做游戲，代碼如下，注釋已經寫的很白癡了：
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[java]?view plaincopyprint?
package?com.example.circleprogressbar;????import?android.content.Context;??import?android.graphics.Canvas;??import?android.graphics.Color;??import?android.graphics.Paint;??import?android.graphics.RectF;??import?android.util.AttributeSet;??import?android.view.View;????public?class?CircleProgressBarView?extends?View?{??????private?int?progress;??????private?int?max;??????private?Paint?paint;??????private?RectF?oval;??????public?int?getMax()?{??????????return?max;??????}??????public?void?setMax(int?max)?{??????????this.max?=?max;??????}??????public?int?getProgress()?{??????????return?progress;??????}??????public?void?setProgress(int?progress)?{??????????this.progress?=?progress;??????????invalidate();??????}????????public?CircleProgressBarView(Context?context,?AttributeSet?attrs)?{??????????super(context,?attrs);??????????paint?=?new?Paint();??????????oval?=?new?RectF();??????}????????@Override??????protected?void?onDraw(Canvas?canvas)?{??????????super.onDraw(canvas);??????????paint.setAntiAlias(true);??????????paint.setFlags(Paint.ANTI_ALIAS_FLAG);??????????paint.setColor(Color.GRAY);??????????paint.setStrokeWidth(10);??????????paint.setStyle(Paint.Style.STROKE);??????????canvas.drawCircle(100,?100,?55,?paint);??????????paint.setColor(Color.GREEN);??????????oval.set(45,?45,?155,?155);??????????canvas.drawArc(oval,?-90,?((float)?progress?/?max)?*?360,?false,?paint);??????????paint.reset();??????????paint.setStrokeWidth(3);??????????paint.setTextSize(35);??????????paint.setColor(Color.BLACK);??????????if?(progress?==?max)?{??????????????canvas.drawText("完成",?70,?110,?paint);??????????}?else?{??????????????canvas.drawText(progress?+?"%",?70,?110,?paint);??????????}??????}??}?? ?
[html]?view plaincopyprint?
<RelativeLayout?xmlns:android="http://schemas.android.com/apk/res/android"??????xmlns:tools="http://schemas.android.com/tools"??????android:layout_width="match_parent"??????android:layout_height="match_parent"??????android:paddingBottom="@dimen/activity_vertical_margin"??????android:paddingLeft="@dimen/activity_horizontal_margin"??????android:paddingRight="@dimen/activity_horizontal_margin"??????android:paddingTop="@dimen/activity_vertical_margin"??????tools:context=".CirclePbActivity"?>????????<com.example.circleprogressbar.CircleProgressBarView??????????android:id="@+id/circleProgressBar"??????????android:layout_width="wrap_content"??????????android:layout_height="wrap_content"?/>??</RelativeLayout>?? ?
[java]?view plaincopyprint?
package?com.example.circleprogressbar;????import?android.os.Bundle;??import?android.os.Handler;??import?android.app.Activity;??import?android.view.Menu;????public?class?CirclePbActivity?extends?Activity?{??????private?CircleProgressBarView?testConvas;??????private?int?i?=?0;??????Handler?handler?=?new?Handler()?{??????????public?void?handleMessage(android.os.Message?msg)?{??????????????testConvas.setProgress(msg.what);??????????????if?(i?<=?testConvas.getMax())?{??????????????????handler.sendEmptyMessageDelayed(i++,?50);??????????????}??????????};??????};??????@Override??????protected?void?onCreate(Bundle?savedInstanceState)?{??????????super.onCreate(savedInstanceState);??????????setContentView(R.layout.activity_circle_progressbar);??????????testConvas?=?(CircleProgressBarView)?findViewById(R.id.circleProgressBar);??????????testConvas.setMax(100);??????????handler.sendEmptyMessageDelayed(i++,?50);??????}??}??
做了圓形的，一不做二不休，把horizontalProgressBar也做了一遍，加了一點創意要素，立馬多了幾分藝術氣息(其實好像更俗氣了)，各位可以自己發揮想象力。
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[java]?view plaincopyprint?
package?com.example.circleprogressbar;????import?android.annotation.SuppressLint;??import?android.content.Context;??import?android.graphics.Bitmap;??import?android.graphics.BitmapFactory;??import?android.graphics.Canvas;??import?android.graphics.Color;??import?android.graphics.Paint;??import?android.util.AttributeSet;??import?android.view.View;????@SuppressLint("DrawAllocation")??public?class?HorizontalProgressBarView?extends?View?{??????private?int?progress?=?50;??????private?int?max?=?100;??????private?int?mwidth?=?450;??????private?int?mhight?=?40;??????private?int?startX;??????private?int?startY;??????private?Paint?paint;????????public?int?getMwidth()?{??????????return?mwidth;??????}????????public?void?setMwidth(int?mwidth)?{??????????this.mwidth?=?mwidth;??????}????????public?int?getMhight()?{??????????return?mhight;??????}????????public?void?setMhight(int?mhight)?{??????????this.mhight?=?mhight;??????}????????public?int?getProgress()?{??????????return?progress;??????}????????public?void?setProgress(int?progress)?{??????????this.progress?=?progress;??????????invalidate();??????}????????public?int?getMax()?{??????????return?max;??????}????????public?void?setMax(int?max)?{??????????this.max?=?max;??????}????????public?HorizontalProgressBarView(Context?context,?AttributeSet?attrs)?{??????????super(context,?attrs);??????????paint?=?new?Paint();??????}????????@Override??????protected?void?onDraw(Canvas?canvas)?{??????????super.onDraw(canvas);??????????paint.setAntiAlias(true);??????????paint.setFlags(Paint.ANTI_ALIAS_FLAG);??????????paint.setColor(Color.parseColor("#EFEFEF"));??????????paint.setStrokeWidth(10);??????????canvas.drawRect(startX,?startY,?mwidth,?mhight,?paint);??????????paint.setColor(Color.parseColor("#76B034"));??????????canvas.drawRect(startX,?startY,?((float)?progress?/?max)?*?mwidth,??????????????????mhight,?paint);????????????????????paint.setStrokeWidth(2);??????????paint.setColor(Color.YELLOW);??????????canvas.drawLine(startX,?startY?+?(mhight?-?startY)?/?4?*?1,??????????????????((float)?progress?/?max)?*?mwidth,?startY?+?(mhight?-?startY)??????????????????????????/?4?*?1,?paint);??????????paint.setColor(Color.RED);??????????canvas.drawLine(startX,?startY?+?(mhight?-?startY)?/?4?*?2,??????????????????((float)?progress?/?max)?*?mwidth,?startY?+?(mhight?-?startY)??????????????????????????/?4?*?2,?paint);??????????paint.setColor(Color.WHITE);??????????canvas.drawLine(startX,?startY?+?(mhight?-?startY)?/?4?*?3,??????????????????((float)?progress?/?max)?*?mwidth,?startY?+?(mhight?-?startY)??????????????????????????/?4?*?3,?paint);????????????????????if(progress<(max/3)){??????????????paint.setColor(Color.BLACK);??????????}else?if(progress<(max/3)*2&&progress>(max/3)){??????????????paint.setColor(Color.YELLOW);??????????}else{??????????????paint.setColor(Color.RED);??????????}??????????paint.setTextSize(30);??????????canvas.drawText(progress?+?"%",?((float)?progress?/?max)?*?mwidth?-?20,??????????????????mhight?+?30,?paint);??????}??}?? 最后談一下感想：
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總感覺學的越多，自己的想象力和創新能力越枯竭，代碼敲多了，腦袋敲不靈活了，以前沒接觸程序的時候有很多的想法，現在感覺自己越來越平庸，沒了那份想象力，和搬磚的有什么區別？天朝的教育讓能很快學會人家的技術，但是永遠跟著別人后面，就看各大布局，各種控件，基本上都是學國外的。哎，不吐槽了，已經這樣了，我希望能保存自己僅有的那份想象力，在敲代碼的時候多想想自己能創造什么，一次從無到有，比重復千萬次人家的都有價值，我是這么認為的。
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原文：http://blog.csdn.net/mobilexu/article/details/9666461
轉載于:https://www.cnblogs.com/veins/p/3719424.html
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