android-自定义控件之液位指示器

　　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^^：

<?xml version="1.0" encoding="utf-8"?>
<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。

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;

/**
 * 作者：jww 邮箱:bluejww@163.com 时间：2016年3月8日
 */
public class JianWWIndicateProgress extends ProgressBar {

	
	private static final int unreached_color = 0Xaa0000ff;// 未到达的颜色
	private static final int reached_color = 0Xaaff0000;// 到达颜色
	private static final int progress_height = 150;// 容器中液位的默认高度
	private static final int progress_width = 100;// 容器中液位的宽度
	private static final int reached_height = 60;// 默认到达到达的高度
	private static final int progress_cheek_width = 2;// 容器的边框宽度
	private static final int progress_cheek_color = 0x660000ff;// 容器的边框颜色
	private static final int progress_reached_textsize = 10;// 指示字体尺寸
	private static final int progress_reached_textcolor = 0Xff00ff00;// 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 2 px
	 *
	 */
	protected int dp2px(int dpVal) {
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, getResources().getDisplayMetrics());
	}

	/**
	 * sp 2 px
	 *
	 */
	protected int sp2px(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, 0);
	}

	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 = dp2px(
				(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，
	 */
	@Override
	protected 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 = 0;
		int widthSpaceSize = MeasureSpec.getSize(widthMeasureSpec);
		int widthSpaceMode = MeasureSpec.getMode(widthMeasureSpec);

		if (widthSpaceMode == MeasureSpec.EXACTLY) {
			result = widthSpaceSize;
			widthZoom = widthSpaceSize/(progressWidth+2*cheekWidth);
			progressWidth = (int) (progressWidth * widthZoom);
			
		} else if (widthSpaceMode == MeasureSpec.UNSPECIFIED) {
			result = Math.max(widthSpaceSize, getPaddingLeft() + getPaddingRight() + progressWidth + 2 * cheekWidth);
		} else if (widthSpaceMode == MeasureSpec.AT_MOST) {
			result = Math.min(widthSpaceSize, getPaddingLeft() + getPaddingRight() + progressWidth + 2 * cheekWidth);
		}

		return result;
	}

	/**
	 * 
	 * @param heightMeasureSpec
	 * @return获取高度尺寸
	 */
	private int measurdHeight(int heightMeasureSpec) {
		int result = 0;
		int heightSpaceSize = MeasureSpec.getSize(heightMeasureSpec);
		int heightSpaceMode = MeasureSpec.getMode(heightMeasureSpec);

		if (heightSpaceMode == MeasureSpec.EXACTLY) {
			result = heightSpaceSize;
			heightZoom = heightSpaceSize/(progressHeight+2*cheekWidth);
			progressHeight = (int) (progressHeight*heightZoom);
			
			
		} else if (heightSpaceMode == MeasureSpec.UNSPECIFIED) {
			result = Math.max(heightSpaceSize, getPaddingTop() + getPaddingBottom() + progressHeight + 2 * cheekWidth);
		} else if (heightSpaceMode == MeasureSpec.AT_MOST) {
			result = Math.min(heightSpaceSize, getPaddingTop() + getPaddingBottom() + progressHeight + 2 * cheekWidth);
		}

		return result;
	}

	/**
	 * 绘制控件
	 */

	@Override
	protected synchronized void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		
		radio = getProgress() * 1.0f / 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/2, cheekWidth/2, progressWidth + cheekWidth*3/2, progressHeight + cheekWidth*3/2,
				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 = sp2px(reachedTextsize)/2;
		if(progressNowHeight >= progressHeight/2){
			canvas.drawText(text, cheekWidth + progressWidth / 2, cheekWidth + progressHeight - progressNowHeight+textHeight, paint);
		}else{
			canvas.drawText(text, cheekWidth + progressWidth / 2, cheekWidth + progressHeight - progressNowHeight, paint);
			
		}

		canvas.restore();

	}

}

　　3.就是在布局中的引用了

<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.JianWWIndicateProgress
        android:id="@+id/jp_progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:max="100"
        app:progress_cheek_color="#660000ff"
        app:progress_cheek_width="4dp"
        app:progress_height="160dp"
        app:progress_reached_color="#ff0000"
        app:progress_reached_textcolor="#000000"
        app:progress_reached_textsize="12sp"
        app:progress_unreachedcolor="#4400ff00"
        app:progress_width="40dp" />

</RelativeLayout>

　　4.就是在acitivity中的初始化与使用。

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 >= 100) {
				jprogress.setProgress(0);
			}
			mHandler.sendEmptyMessageDelayed(100, 100);
		};
	};

	@Override
	protected 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(100);
		
		
	}
}

　　好了，写的比较粗糙，有什么大家可以一块讨论，功能可以实现，但有个别细节没有处理好。^^

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