由于安卓应用很广泛，在工业中也常有一些应用，比如可以用安卓来去工业中的一些数据进行实现的监测，显示，同时可以做一些自动化控制，当然在这里，我不是做这些自动化控制方面的研究，只是做一个控件，液位指示，其实就是继承自progressbar,然后重新写一测量与绘制，算是对自定义控件进行一下复习。
我们要做的最终就是下面这个效果：
在这里，我们要做到对这个指示器的以下属性可设置：
容器壁的厚度、容器壁的颜色、容器中液体的宽度、液体总高度、液体当前高度的颜色显示、液体未达到颜色显示、当前高度的文字指示、指示文字大小的显示。
对以上属性的可以设置，会使在实现应用中让显示更加直观人性化。下面就开始我们的指示器的制作。
1.先在项目的res目录下建一个resouce文件，用来定义自定义的属性，这些都会在下面给出的源码中给出，新人可以参考下，老家伙你就绕道吧^^：
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<?xml version="." encoding="utf-"?><resources><declare-styleable name="jianwwindicateprogress"><attr name="progress_height" format="dimension" /><attr name="progress_width" format="dimension" /><attr name="progress_unreachedcolor" format="color" /><attr name="progress_reached_color" format="color" /><attr name="progress_reached_height" format="integer" /><attr name="progress_cheek_width" format="dimension" /><attr name="progress_cheek_color" format="color" /><attr name="progress_reached_textsize" format="dimension" /><attr name="progress_reached_textcolor" format="color" /></declare-styleable></resources> |
2.继承progressbar,这里继承他主要是为了能够用progressbar的getprogress()方法得到当前的progress,与setprogress()方法等progress中提供的一些方法，便于对数据的一些处理。
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package com.jianww.firstview;import com.example.jwwcallback.r;import android.content.context;import android.content.res.typedarray;import android.graphics.canvas;import android.graphics.color;import android.graphics.paint;import android.graphics.paint.style;import android.graphics.rect;import android.util.attributeset;import android.util.typedvalue;import android.widget.progressbar;public class jianwwindicateprogress extends progressbar {private static final int unreached_color = xaaff;// 未到达的颜色private static final int reached_color = xaaff;// 到达颜色private static final int progress_height = ;// 容器中液位的默认高度private static final int progress_width = ;// 容器中液位的宽度private static final int reached_height = ;// 默认到达到达的高度private static final int progress_cheek_width = ;// 容器的边框宽度private static final int progress_cheek_color = xff;// 容器的边框颜色private static final int progress_reached_textsize = ;// 指示字体尺寸private static final int progress_reached_textcolor = xffff;// 指示字体颜色protected int unreachedcolor;// 未到达的颜色protected int reachedcolor;// 到达颜色protected int progressheight;// 容器中液位的总高度protected int progresswidth;// 容器中液面的宽度protected int reachedheight;// 默认液位到达的到达的高度protected int cheekwidth;// 容器的边框宽度protected int cheekcolor;// 容器的边框颜色protected int reachedtextsize;// 指示字体尺寸protected int reachedtextcolor;// 指示字体颜色protected float widthzoom;protected float heightzoom;/*** dp px**/protected int dppx(int dpval) {return (int) typedvalue.applydimension(typedvalue.complex_unit_dip, dpval, getresources().getdisplaymetrics());}/*** sp px**/protected int sppx(int spval) {return (int) typedvalue.applydimension(typedvalue.complex_unit_sp, spval, getresources().getdisplaymetrics());}private paint paintcheek = new paint();private paint paint = new paint();private float radio;private float progressnowheight;public jianwwindicateprogress(context context) {this(context, null);}public jianwwindicateprogress(context context, attributeset asets) {this(context, asets, );}public jianwwindicateprogress(context context, attributeset asets, int defstyle) {super(context, asets, defstyle);obtainstyledattributes(asets);// paint.settextsize(reachedtextsize);// paint.setcolor(reachedtextcolor);}/*** 定义属性* * @param asets属性*/private void obtainstyledattributes(attributeset asets) {final typedarray typearray = getcontext().obtainstyledattributes(asets, r.styleable.jianwwindicateprogress);unreachedcolor = typearray.getcolor(r.styleable.jianwwindicateprogress_progress_unreachedcolor,unreached_color);reachedcolor = typearray.getcolor(r.styleable.jianwwindicateprogress_progress_reached_color, reached_color);// 到达颜色progressheight = (int) typearray.getdimension(r.styleable.jianwwindicateprogress_progress_height,progress_height);progresswidth = dppx((int) typearray.getdimension(r.styleable.jianwwindicateprogress_progress_width, progress_width));// 容器的总宽度reachedheight = (int) typearray.getdimension(r.styleable.jianwwindicateprogress_progress_reached_height,reached_height);// 到达的高度cheekwidth = (int) typearray.getdimension(r.styleable.jianwwindicateprogress_progress_cheek_width,progress_cheek_width);// 容器的边框宽度cheekcolor = typearray.getcolor(r.styleable.jianwwindicateprogress_progress_cheek_color, progress_cheek_color);reachedtextsize = (int) typearray.getdimension(r.styleable.jianwwindicateprogress_progress_reached_textsize,progress_reached_textsize);// 指示字体尺寸reachedtextcolor = typearray.getcolor(r.styleable.jianwwindicateprogress_progress_reached_textcolor,progress_reached_textcolor);// 指示字体颜色typearray.recycle();}/*** onmeasure是对绘出的控件将来占的空间进行的安排，*/@overrideprotected synchronized void onmeasure(int widthmeasurespec, int heightmeasurespec) {super.onmeasure(widthmeasurespec, heightmeasurespec);int totalwidth = measurdwidth(widthmeasurespec);int totalheight = measurdheight(heightmeasurespec);setmeasureddimension(totalwidth, totalheight);}/**** @param widthmeasurespec* @return 获取宽度尺寸*/private int measurdwidth(int widthmeasurespec) {int result = ;int widthspacesize = measurespec.getsize(widthmeasurespec);int widthspacemode = measurespec.getmode(widthmeasurespec);if (widthspacemode == measurespec.exactly) {result = widthspacesize;widthzoom = widthspacesize/(progresswidth+*cheekwidth);progresswidth = (int) (progresswidth * widthzoom);} else if (widthspacemode == measurespec.unspecified) {result = math.max(widthspacesize, getpaddingleft() + getpaddingright() + progresswidth + * cheekwidth);} else if (widthspacemode == measurespec.at_most) {result = math.min(widthspacesize, getpaddingleft() + getpaddingright() + progresswidth + * cheekwidth);}return result;}/*** * @param heightmeasurespec* @return获取高度尺寸*/private int measurdheight(int heightmeasurespec) {int result = ;int heightspacesize = measurespec.getsize(heightmeasurespec);int heightspacemode = measurespec.getmode(heightmeasurespec);if (heightspacemode == measurespec.exactly) {result = heightspacesize;heightzoom = heightspacesize/(progressheight+*cheekwidth);progressheight = (int) (progressheight*heightzoom);} else if (heightspacemode == measurespec.unspecified) {result = math.max(heightspacesize, getpaddingtop() + getpaddingbottom() + progressheight + * cheekwidth);} else if (heightspacemode == measurespec.at_most) {result = math.min(heightspacesize, getpaddingtop() + getpaddingbottom() + progressheight + * cheekwidth);}return result;}/*** 绘制控件*/@overrideprotected synchronized void ondraw(canvas canvas) {super.ondraw(canvas);radio = getprogress() * .f / getmax();progressnowheight = (int) (progressheight * radio);// 存绘画前画布状态canvas.save();// 把画布移动到要绘制的点canvas.translate(getpaddingleft(), getpaddingright());// 绘制容器外壳paintcheek.setcolor(cheekcolor);// 画笔颜色paintcheek.setantialias(true);// 是否过度paintcheek.setstyle(style.stroke);// 空心paintcheek.setstrokewidth(cheekwidth);// 边框的宽度canvas.drawrect(cheekwidth/, cheekwidth/, progresswidth + cheekwidth*/, progressheight + cheekwidth*/,paintcheek);// 绘总液位paint.setcolor(unreachedcolor);paint.setstyle(style.fill);canvas.drawrect(cheekwidth, cheekwidth, progresswidth+cheekwidth, progressheight+cheekwidth,paint);// 绘当前液位paint.setstyle(style.fill);paint.setcolor(reachedcolor);canvas.drawrect(cheekwidth, cheekwidth + progressheight - progressnowheight,progresswidth + cheekwidth, progressheight + cheekwidth, paint);// 绘液位指示string text = getprogress() + "%";paint.settextsize(reachedtextsize);paint.setcolor(reachedtextcolor);float textheight = sppx(reachedtextsize)/;if(progressnowheight >= progressheight/){canvas.drawtext(text, cheekwidth + progresswidth / , cheekwidth + progressheight - progressnowheight+textheight, paint);}else{canvas.drawtext(text, cheekwidth + progresswidth / , cheekwidth + progressheight - progressnowheight, paint);}canvas.restore();}} |
3.就是在布局中的引用了
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<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"xmlns:jwwprogress="http://schemas.android.com/apk/res-auto"xmlns:app="http://schemas.android.com/apk/res/com.example.jwwcallback"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center" ><com.jianww.firstview.jianwwindicateprogressandroid:id="@+id/jp_progress"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerinparent="true"android:max=""app:progress_cheek_color="#ff"app:progress_cheek_width="dp"app:progress_height="dp"app:progress_reached_color="#ff"app:progress_reached_textcolor="#"app:progress_reached_textsize="sp"app:progress_unreachedcolor="#ff"app:progress_width="dp" /></relativelayout> |
4.就是在acitivity中的初始化与使用。
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package com.example.jwwmain;import java.io.ioexception;import java.net.httpurlconnection;import java.net.malformedurlexception;import java.net.url;import java.util.random;import com.example.jwwcallback.r;import com.jianww.firstview.jianwwindicateprogress;import android.app.activity;import android.os.bundle;import android.os.handler;public class mainactivity extends activity {private jianwwindicateprogress jprogress;private int nowprogress;private handler mhandler = new handler() {public void handlemessage(android.os.message msg) {int progress = jprogress.getprogress();jprogress.setprogress(++progress);if (progress >= ) {jprogress.setprogress();}mhandler.sendemptymessagedelayed(, );};};@overrideprotected void oncreate(bundle savedinstancestate) {super.oncreate(savedinstancestate);setcontentview(r.layout.activity_main);initview();}private void initview() {jprogress = (jianwwindicateprogress) findviewbyid(r.id.jp_progress);mhandler.sendemptymessage();}} |
关于android中自定义控件之液位指示器的相关知识就给大家介绍到这里，希望对大家有所帮助！
