自定义控件CustomView（炒股界面 显示 时间与价格 还有折线）

CustomView 自定义控件继承View

public class CustomView extends View {    int viewWidth, viewHeight;    int gap;    ArrayList<HashMap<String, String>> list;    int maxPrice;    int touchY;    public CustomView(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    public boolean onTouchEvent(MotionEvent event) {touchY=(int) event.getY();int x=(int) event.getX();Log.i("坐标", x+",gap="+gap);int index=x/gap;Toast.makeText(getContext(), list.get(index).get("time"), Toast.LENGTH_SHORT).show();        return super.onTouchEvent(event);    }    // textView.setText()    public void setData(ArrayList<HashMap<String, String>> list) {        this.list = list;        for (int i = 0; i < list.size(); i++) {            int price = Integer.parseInt(list.get(i).get("price"));            if (price > maxPrice) {                maxPrice = price;            }        }    }    // 画    @Override    protected void onDraw(Canvas canvas) {        try {            Log.i("测试", "onDraw()");            Paint paint = new Paint();            paint.setColor(Color.BLACK);            // 画背景            Rect backgroundRect = new Rect(0, 0, viewWidth, viewHeight);            canvas.drawRect(backgroundRect, paint);            // 画时间            paint.setColor(Color.WHITE);            paint.setTextSize(24);            String lastTime = list.get(list.size() - 1).get("time");            Rect rect = new Rect();            paint.getTextBounds(lastTime, 0, lastTime.length(), rect);            int lastTimeWidth = rect.width();            gap = (viewWidth - lastTimeWidth * 2) / (list.size() - 1);            int priceHeight = viewHeight - rect.height();            for (int i = 0; i < list.size(); i++) {                String time = list.get(i).get("time");                canvas.drawText(time, i * gap, viewHeight, paint);                // 画price                String strPrice = list.get(i).get("price");                int intPrice = Integer.parseInt(strPrice);                int priceY = intPrice * priceHeight / maxPrice;                // 最大的值显示在下面，应该显示在上面                priceY = priceHeight - priceY;                // 最大的值显示在控件的外面                priceY = priceY + rect.height();                canvas.drawText(strPrice, i * gap, priceY, paint);                // 画线                if (i < list.size() - 1) {                    int startX = i * gap;                    int startY = priceY;                    int stopX = (i + 1) * gap;                    int stopY = 0;                    String strNextPrice = list.get(i + 1).get("price");                    int nextPriceY = Integer.parseInt(strNextPrice)                            * priceHeight / maxPrice;                    nextPriceY = priceHeight - nextPriceY;                    nextPriceY = nextPriceY + rect.height();                    stopY = nextPriceY;                    canvas.drawLine(startX, startY, stopX, stopY, paint);                }            }            //画线            paint.setColor(Color.RED);            if (touchY>=1)            {                canvas.drawLine(0, touchY, viewWidth, touchY, paint);            }        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        viewHeight = h;        viewWidth = w;    }}

在activity中

public class MainActivity extends Activity {CustomView customView;Random random=new Random();Handler handler=new Handler();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        customView=(CustomView) findViewById(R.id.customView);        customView.setData(getData());        handler.postDelayed(new Runnable() {            @Override            public void run() {                Log.i("测试", "run");                customView.setData(getData());                //直接调用                //customView.onDraw(canvas)                //屏幕无效--》重新画 调ondraw                //间接调用handler.sendMessage, handleMessage()                //sendBroadcast  onReceiver()                //如保让界面更新                //1,textView.setText()                //2,adapter.notifyDataSetChanged()                //3,invalidate()                customView.invalidate();                //延迟1秒 再从新执行这个run                handler.postDelayed(this, 1000);            }        }, 1000);    }    public ArrayList<HashMap<String, String>> getData()    {        //9 3000        //10 4000        //11 5000        //13 6000        ArrayList<HashMap<String, String>> list=new ArrayList<HashMap<String,String>>();        HashMap<String, String> map=new HashMap<String, String>();        map.put("time", "9");        map.put("price", String.valueOf(random.nextInt(5000)));        list.add(map);        map=new HashMap<String, String>();        map.put("time", "10");        map.put("price", String.valueOf(random.nextInt(5000)));        list.add(map);        map=new HashMap<String, String>();        map.put("time", "11");        map.put("price", String.valueOf(random.nextInt(5000)));        list.add(map);        map=new HashMap<String, String>();        map.put("time", "13");        map.put("price", String.valueOf(random.nextInt(5000)));        list.add(map);        return list;    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

layout 布局文件