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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