由於安卓應用很廣泛，在工業中也常有一些應用，比如可以用安卓來去工業中的一些數據進行實現的監測，顯示，同時可以做一些自動化控制，當然在這里，我不是做這些自動化控制方面的研究，只是做一個控件，液位指示，其實就是繼承自progressbar,然后重新寫一測量與繪制，算是對自定義控件進行一下復習。
我們要做的最終就是下面這個效果：
在這里，我們要做到對這個指示器的以下屬性可設置：
容器壁的厚度、容器壁的顏色、容器中液體的寬度、液體總高度、液體當前高度的顏色顯示、液體未達到顏色顯示、當前高度的文字指示、指示文字大小的顯示。
對以上屬性的可以設置，會使在實現應用中讓顯示更加直觀人性化。下面就開始我們的指示器的制作。
1.先在項目的res目錄下建一個resouce文件，用來定義自定義的屬性，這些都會在下面給出的源碼中給出，新人可以參考下，老家伙你就繞道吧^^：
1 <?xml version="1.0" encoding="utf-8"?> 2 <resources> 3 4 <declare-styleable name="JianWWIndicateProgress"> 5 <attr name="progress_height" format="dimension" /> 6 <attr name="progress_width" format="dimension" /> 7 <attr name="progress_unreachedcolor" format="color" /> 8 <attr name="progress_reached_color" format="color" /> 9 <attr name="progress_reached_height" format="integer" /> 10 <attr name="progress_cheek_width" format="dimension" /> 11 <attr name="progress_cheek_color" format="color" /> 12 <attr name="progress_reached_textsize" format="dimension" /> 13 <attr name="progress_reached_textcolor" format="color" /> 14 </declare-styleable> 15 16 </resources>
2.繼承progressbar,這里繼承他主要是為了能夠用progressbar的getProgress()方法得到當前的progress,與setProgress()方法等progress中提供的一些方法，便於對數據的一些處理。
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 郵箱:bluejww@163.com 時間：2016年3月8日
*/
public class JianWWIndicateProgress extends ProgressBar {
private static final int unreached_color = 0Xaa0000ff;// 未到達的顏色
private static final int reached_color = 0Xaaff0000;// 到達顏色
private static final int progress_height = 150;// 容器中液位的默認高度
private static final int progress_width = 100;// 容器中液位的寬度
private static final int reached_height = 60;// 默認到達到達的高度
private static final int progress_cheek_width = 2;// 容器的邊框寬度
private static final int progress_cheek_color = 0x660000ff;// 容器的邊框顏色
private static final int progress_reached_textsize = 10;// 指示字體尺寸
private static final int progress_reached_textcolor = 0Xff00ff00;// 指示字體顏色
protected int unReachedColor;// 未到達的顏色
protected int reachedColor;// 到達顏色
protected int progressHeight;// 容器中液位的總高度
protected int progressWidth;// 容器中液面的寬度
protected int reachedHeight;// 默認液位到達的到達的高度
protected int cheekWidth;// 容器的邊框寬度
protected int cheekColor;// 容器的邊框顏色
protected int reachedTextsize;// 指示字體尺寸
protected int reachedTextcolor;// 指示字體顏色
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);
}
/**
* 定義屬性
*
* @param asets屬性
*/
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);// 到達顏色
progressHeight = (int) typeArray.getDimension(R.styleable.JianWWIndicateProgress_progress_height,
progress_height);
progressWidth = dp2px(
(int) typeArray.getDimension(R.styleable.JianWWIndicateProgress_progress_width, progress_width));// 容器的總寬度
reachedHeight = (int) typeArray.getDimension(R.styleable.JianWWIndicateProgress_progress_reached_height,
reached_height);// 到達的高度
cheekWidth = (int) typeArray.getDimension(R.styleable.JianWWIndicateProgress_progress_cheek_width,
progress_cheek_width);// 容器的邊框寬度
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);// 指示字體尺寸
reachedTextcolor = typeArray.getColor(R.styleable.JianWWIndicateProgress_progress_reached_textcolor,
progress_reached_textcolor);// 指示字體顏色
typeArray.recycle();
}
/**
* onMeasure是對繪出的控件將來占的空間進行的安排，
*/
@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 獲取寬度尺寸
*/
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獲取高度尺寸
*/
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;
}
/**
* 繪制控件
*/
@Override
protected synchronized void onDraw(Canvas canvas) {
super.onDraw(canvas);
radio = getProgress() * 1.0f / getMax();
progressNowHeight = (int) (progressHeight * radio);
// 存繪畫前畫布狀態
canvas.save();
// 把畫布移動到要繪制的點
canvas.translate(getPaddingLeft(), getPaddingRight());
// 繪制容器外殼
paintCheek.setColor(cheekColor);// 畫筆顏色
paintCheek.setAntiAlias(true);// 是否過度
paintCheek.setStyle(Style.STROKE);// 空心
paintCheek.setStrokeWidth(cheekWidth);// 邊框的寬度
canvas.drawRect(cheekWidth/2, cheekWidth/2, progressWidth + cheekWidth*3/2, progressHeight + cheekWidth*3/2,
paintCheek);
// 繪總液位
paint.setColor(unReachedColor);
paint.setStyle(Style.FILL);
canvas.drawRect(cheekWidth, cheekWidth, progressWidth+cheekWidth, progressHeight+cheekWidth,
paint);
// 繪當前液位
paint.setStyle(Style.FILL);
paint.setColor(reachedColor);
canvas.drawRect(cheekWidth, cheekWidth + progressHeight - progressNowHeight,
progressWidth + cheekWidth, progressHeight + cheekWidth, paint);
// 繪液位指示
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中的初始化與使用。
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，寫的比較粗糙，有什么大家可以一塊討論，功能可以實現，但有個別細節沒有處理好。^^
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