在android实现仪表盘布局效果

package com.dialchart.example; import java.util.Random; import java.util.Timer; import java.util.TimerTask; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.ViewGroup.LayoutParams; public class DialChartActivity extends Activity { private CategorySeries category = new CategorySeries(""); private DialRenderer renderer = new DialRenderer(); private GraphicalView mChartView; private long xhqd=0; Thread mediathread; final Handler handler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case 1: mChartView.invalidate(); break; } super.handleMessage(msg); } }; Timer timer = new Timer(); TimerTask task = new TimerTask() { public void run() { Message message = new Message(); message.what = 1; handler.sendMessage(message); } }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); category.add("Current", 0);//给仪表一个初始值，不然报错 renderer.setChartTitleTextSize(20); renderer.setLabelsTextSize(15); renderer.setLegendTextSize(15);//说明字体的大小 SimpleSeriesRenderer r = new SimpleSeriesRenderer(); r.setColor(Color.RED);//指针的颜色 renderer.addSeriesRenderer(r); renderer.setLabelsTextSize(8);//仪表盘字体大小 renderer.setLabelsColor(Color.GREEN);//仪表盘格子的颜色 renderer.setShowLabels(true); //设置指针样式（默认为三角形）此为箭头 renderer.setVisualTypes(new DialRenderer.Type[] {Type.ARROW}); renderer.setMinValue(-100);//仪表盘最小值 renderer.setMaxValue(100);//仪表盘最大值 timer.schedule(task, 0, 1000 * 1); //启动timer,1秒绘制一次 new ValuesThread().start(); } /** * 在 onResume 里进行绘制时自动调用 */ @Override protected void onResume() { super.onResume(); if (mChartView == null) { LinearLayout layout = (LinearLayout) findViewById(R.id.chart); mChartView = ChartFactory.getDialChartView(DialChart.this, category, renderer); layout.addView(mChartView, new LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); } else { mChartView.setBackgroundResource(R.id.chart); mChartView.repaint(); } } private class ValuesThread extends Thread{ Random random = new Random(100);//指定随机数的种子数 @Override public void run() { while(true){ try { category.clear(); xhqd=random.nextInt()%100;//得到随机数-100到100 category.add("仪表盘", xhqd); Thread.sleep(1000); }catch(InterruptedException e) { e.printStackTrace(); } } } } }