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^^：
<" 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。
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， */ @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 = ; 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 */ @Override protected 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
<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="" 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。
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(, ); }; }; @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(); } }
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！
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