Android一种View动态折线绘制的实现实战

由于工作需要，模拟一个signal变化量走势，所以需要绘制折线动态图，话说使用achartengine这个jar包就能实现各种图形绘制，but工程导入一个包在大小上毕竟是要付出代价的嘛，况且只是为了实现画一条动态曲线嘛，故就用重写View实现了下，还是惯例，直接上代码。

最主要的实现类：

package com.jesse.paintline1;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.util.AttributeSet;import android.view.View;/** * @author Jesse * write this view for draw line,use it easy. */public class LineView extends View {private final static String X_KEY = "Xpos";private final static String Y_KEY = "Ypos";private List<Map<String, Integer>> mListPoint = new ArrayList<Map<String,Integer>>();Paint mPaint = new Paint();public LineView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stub}public LineView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub}public LineView(Context context) {super(context);// TODO Auto-generated constructor stub}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);mPaint.setColor(Color.RED);mPaint.setAntiAlias(true);for (int index=0; index<mListPoint.size(); index++){if (index > 0){canvas.drawLine(mListPoint.get(index-1).get(X_KEY), mListPoint.get(index-1).get(Y_KEY),mListPoint.get(index).get(X_KEY), mListPoint.get(index).get(Y_KEY), mPaint);canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG)); }}}/** * @param curX  which x position you want to draw. * @param curYwhich y position you want to draw. * @seeall you put x-y position will connect to a line. */public void setLinePoint(int curX, int curY){Map<String, Integer> temp = new HashMap<String, Integer>();temp.put(X_KEY, curX);temp.put(Y_KEY, curY);mListPoint.add(temp);invalidate();}}

UI类：

package com.jesse.paintline1;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;public class MainActivity extends Activity {private static final int MSG_DATA_CHANGE = 0x11;private LineView mLineView;private Handler mHandler;private int mX = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mLineView = (LineView) this.findViewById(R.id.line);mHandler = new Handler(){@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubswitch (msg.what) {case MSG_DATA_CHANGE:mLineView.setLinePoint(msg.arg1, msg.arg2);break;default:break;}super.handleMessage(msg);}};new Thread(){public void run() {for (int index=0; index<20; index++){Message message = new Message();message.what = MSG_DATA_CHANGE;message.arg1 = mX;message.arg2 = (int)(Math.random()*200);;mHandler.sendMessage(message);try {sleep(1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}mX += 30;}};}.start();}}

UI布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <com.jesse.paintline1.LineView         android:id="@+id/line"        android:layout_centerInParent="true"        android:layout_width="1024dp"        android:layout_height="576dp"        android:background="@drawable/line_bg"        /></RelativeLayout>

效果不解释，就是动态曲线图，哈哈！

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