自定义控件实现提示信息类

很多时候，需要在一些锁屏，动态墙纸，启动器中加入提示信息，比如时间，日期，短信，电话，电池等信息，封装成一个全屏的ＶＩＥＷ类，既可以当控件在静态布局中使用，也可以在动态布局中使用addＶiew加入，十分方便。支持文字和图片两种方式显示。

package com.example.scr;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.Paint.FontMetrics;
import android.graphics.Paint.Style;
import android.net.Uri;
import android.os.Handler;
import android.provider.CallLog.Calls;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

class PromptMessageView extends View {
	private static final boolean isImg = false;
	private int scr_w = 0, scr_h = 0;
	Context mContext = null;
	ArrayList BmWeek = new ArrayList(12);
	ArrayList BmTime = new ArrayList(11);
	ArrayList BmDate = new ArrayList(8);

	protected String mcallstr = "未接电话：";
	protected String msmsstr = "未读短信：";
	protected int m_callcount = 0;// findMissedCallCount();
	protected int m_smscount = 0;// findNewSmsCount() + findNewMmsCount();
	// 圆心g_x, g_y,半径g_r, 手指位移m_lx, m_ly
	public int g_r = 0;

	public void moveView(int gr) {
		g_r = gr;
		invalidate();
	}
	public PromptMessageView(Context context) {
		super(context);
		mContext = context;
		m_callcount = findMissedCallCount();
		m_smscount = findNewSmsCount() + findNewMmsCount();
		if (isImg) {
			decodeDate();
			decodeTime();
			decodeWeek();
		}
		context.getApplicationContext()
				.getContentResolver()
				.registerContentObserver(
						Uri.parse("content://mms-sms/"),
						true,
						new newMmsContentObserver(context
								.getApplicationContext(), new Handler()));
		context.getApplicationContext()
				.getContentResolver()
				.registerContentObserver(
						/* content://call_log/calls */
						android.provider.CallLog.Calls.CONTENT_URI,
						true,
						new MissedCallContentObserver(context
								.getApplicationContext(), new Handler()));
	}

	public PromptMessageView(Context context, int w, int h) {
		super(context);
		scr_w = w;
		scr_h = h;
		mContext = context;
		m_callcount = findMissedCallCount();
		m_smscount = findNewSmsCount() + findNewMmsCount();
		if (isImg) {
			decodeDate();
			decodeTime();
			decodeWeek();
		}
		context.getApplicationContext()
				.getContentResolver()
				.registerContentObserver(
						Uri.parse("content://mms-sms/"),
						true,
						new newMmsContentObserver(context
								.getApplicationContext(), new Handler()));
		context.getApplicationContext()
				.getContentResolver()
				.registerContentObserver(
						/* content://call_log/calls */
						android.provider.CallLog.Calls.CONTENT_URI,
						true,
						new MissedCallContentObserver(context
								.getApplicationContext(), new Handler()));
	}
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// TODO Auto-generated method stub
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		super.onDraw(canvas);
		if (!isImg) {
			// 设置字体
			Paint p = new Paint();
			p.setColor(Color.WHITE);
			p.setStrokeWidth(1);
			p.setStyle(Style.FILL);
			p.setTextSize(26);
			Typeface font = Typeface.create("黑体", Typeface.BOLD);
			p.setTypeface(font);

			// 显示时间
			boolean isFontMid = false; // 是否居中显示
			float str_left = 10.0f;
			p.setTextSize(120);
			SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
			String time = sdf.format(new Date());
			time = time.substring(0, time.length() - 3);
			int fw = (int) p.measureText(time);
			FontMetrics fm = p.getFontMetrics();
			int fh = (int) Math.ceil(fm.descent - fm.top) + 2;
			if (isFontMid) {
				canvas.drawText(time, (scr_w - fw) / 2, 200 - g_r, p);
			} else {
				canvas.drawText(time, str_left, 200 - g_r, p);
			}
			// 显示星期
			sdf = new SimpleDateFormat("EEEE");
			String week = sdf.format(new Date());
			// 显示日期+星期
			p.setTextSize(20);
			sdf = new SimpleDateFormat("yyyy-MM-dd");
			String date = sdf.format(new Date());
			date = date.substring(5, date.length());
			date = date + "," + week;
			fw = (int) p.measureText(date);
			if (isFontMid) {
				canvas.drawText(date, (scr_w - fw) / 2, 200 + 30 - g_r, p);
			} else {
				canvas.drawText(date, str_left, 200 + 30 - g_r, p);
			}

			// 显示未接电话
			p.setTextSize(15);
			if (isFontMid) {
				canvas.drawText(mcallstr + String.valueOf(m_callcount),
						(scr_w - fw) / 2, 300 - g_r, p);
			} else {
				canvas.drawText(mcallstr + String.valueOf(m_callcount),
						str_left, 300 - g_r, p);
			}
			// 显示未读短信
			if (isFontMid) {
				canvas.drawText(msmsstr + String.valueOf(m_smscount),
						(scr_w - fw) / 2, 350 - g_r, p);
			} else {
				canvas.drawText(msmsstr + String.valueOf(m_smscount), str_left,
						320 - g_r, p);
			}
		} else {
			// 贴图实现
			// drawDate(tmpCanvas, 100, 500);
			// drawTime(tmpCanvas, 100, 400);
			// drawWeek(tmpCanvas, 300, 500);
			newDrawDate(canvas, 100, 500 - g_r);
			newDrawTime(canvas, 100, 400 - g_r);
			newDrawWeek(canvas, 300, 500 - g_r);
		}
	}
	// 监控电话数目
	private int findMissedCallCount() {
		int missedCallCount = 0;

		StringBuilder where = new StringBuilder("type = ");
		where.append(Calls.MISSED_TYPE);
		where.append(" AND new = 1");

		// start the query
		Cursor cur = null;
		try {
			cur = mContext
					.getApplicationContext()
					.getContentResolver()
					.query(Calls.CONTENT_URI, new String[] { Calls._ID },
							where.toString(), null, Calls.DEFAULT_SORT_ORDER);

			if (cur != null) {
				missedCallCount = cur.getCount();
			}
		} catch (Exception ex) {
		} finally {
			if (cur != null) {
				cur.close();
			}
		}

		return missedCallCount;
	}

	// 监控短信，彩信数目变化
	private int findNewSmsCount() {
		Cursor csr = null;
		int newSmsCount = 0;
		try {
			csr = mContext
					.getApplicationContext()
					.getContentResolver()
					.query(Uri.parse("content://sms"), null,
							"type = 1 and read = 0", null, null);
			newSmsCount = csr.getCount(); // 未读短信数目
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (csr != null)
				csr.close();
		}
		return newSmsCount;
	}

	// 监控短信，短信数目变化
	private int findNewMmsCount() {
		Cursor csr = null;
		int newMmsCount = 0;
		try {
			csr = mContext
					.getApplicationContext()
					.getContentResolver()
					.query(Uri.parse("content://mms/inbox"), null, "read = 0",
							null, null);
			newMmsCount = csr.getCount();// 未读彩信数目
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (csr != null)
				csr.close();
		}
		return newMmsCount;
	}

	// 监控信息数据库
	public class newMmsContentObserver extends ContentObserver {
		private Context ctx;
		private Handler m_handler;
		int newMmsCount = 0;
		int newSmsCount = 0;

		public newMmsContentObserver(Context context, Handler handler) {
			super(handler);
			ctx = context;
			m_handler = handler;
		}

		@Override
		public void onChange(boolean selfChange) {
			newMmsCount = findNewSmsCount();
			newSmsCount = findNewMmsCount();
			Log.i("@@@@@", "newSmsCount = " + (newSmsCount + newMmsCount));
			m_smscount = newMmsCount + newSmsCount;
			postInvalidate();
		}
	}

	// 监控电话数据库
	public class MissedCallContentObserver extends ContentObserver {

		private Context ctx;
		int missedCallCount = 0;
		private Handler m_handler;
		private static final String TAG = "MissedCallContentObserver";

		public MissedCallContentObserver(Context context, Handler handler) {
			super(handler);
			ctx = context;
			m_handler = handler;
		}

		@Override
		public void onChange(boolean selfChange) {
			missedCallCount = findMissedCallCount();
			Log.i("@@@@@", "missedCallCount = " + missedCallCount);
			m_callcount = missedCallCount;
			postInvalidate();
		}
	}

	

	public void decodeDate() {

		Bitmap bm = null;
		int[] imgIds = { R.drawable.r011, R.drawable.r111, R.drawable.r211,
				R.drawable.r311, R.drawable.r411, R.drawable.r511,
				R.drawable.r611, R.drawable.r711, R.drawable.r811,
				R.drawable.r911, R.drawable.hy11, R.drawable.h711, };

		for (int i = 0; i < imgIds.length; i++) {
			bm = BitmapFactory.decodeResource(mContext.getResources(),
					imgIds[i]);
			BmDate.add(bm);
			// BmDate[i] = bm;
		}

	}

	public void newDrawDate(Canvas canvas, int x, int y) {
		Bitmap bm = null;
		int pos = x;
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		String date = sdf.format(new Date());
		date = date.substring(5, date.length());
		// canvas.drawText(date, x, y, null);

		for (int i = 0; i < date.length(); i++) {

			if (date.charAt(i) == '-') {
				bm = BmDate.get(10);
				// bm = BmDate[10];
			} else {
				bm = BmDate.get(date.charAt(i) - '0');
				// bm = BmDate[date.charAt(i) - '0'];
			}
			canvas.drawBitmap(bm, pos, y, null);
			pos += bm.getWidth();
		}
		bm = BmDate.get(11);
		// bm = BmDate[11];
		canvas.drawBitmap(bm, pos, y, null);
	}

	public void drawDate(Canvas canvas, int x, int y) {

		Bitmap bm = null;
		int[] imgIds = { R.drawable.r011, R.drawable.r111, R.drawable.r211,
				R.drawable.r311, R.drawable.r411, R.drawable.r511,
				R.drawable.r611, R.drawable.r711, R.drawable.r811,
				R.drawable.r911, R.drawable.hy11, R.drawable.h711, };
		int pos = x;
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		String date = sdf.format(new Date());
		date = date.substring(5, date.length());
		// canvas.drawText(date, x, y, null);

		for (int i = 0; i < date.length(); i++) {

			if (date.charAt(i) == '-') {
				bm = BitmapFactory.decodeResource(mContext.getResources(),
						imgIds[10]);
			} else {
				bm = BitmapFactory.decodeResource(mContext.getResources(),
						imgIds[date.charAt(i) - '0']);
			}
			canvas.drawBitmap(bm, pos, y, null);
			pos += bm.getWidth();
		}
		bm = BitmapFactory.decodeResource(mContext.getResources(), imgIds[11]);
		canvas.drawBitmap(bm, pos, y, null);
	}

	public void decodeTime() {

		Bitmap bm = null;
		int[] imgIds = { R.drawable.time_0, R.drawable.time_1,
				R.drawable.time_2, R.drawable.time_3, R.drawable.time_4,
				R.drawable.time_5, R.drawable.time_6, R.drawable.time_7,
				R.drawable.time_8, R.drawable.time_9, R.drawable.time_dot };

		for (int i = 0; i < imgIds.length; i++) {
			bm = BitmapFactory.decodeResource(mContext.getResources(),
					imgIds[i]);
			BmTime.add(bm);
		}

	}

	public void newDrawTime(Canvas canvas, int x, int y) {
		Bitmap bm = null;
		int pos = x;
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		String date = sdf.format(new Date());
		date = date.substring(5, date.length());
		// canvas.drawText(date, x, y, null);

		for (int i = 0; i < date.length(); i++) {

			if (date.charAt(i) == '-') {
				bm = BmTime.get(10);

			} else {
				bm = BmTime.get(date.charAt(i) - '0');

			}
			canvas.drawBitmap(bm, pos, y, null);
			pos += bm.getWidth();
		}

	}

	public void drawTime(Canvas canvas, int x, int y) {
		Bitmap bm = null;
		
		int[] imgIds = { R.drawable.time_0, R.drawable.time_1,
				R.drawable.time_2, R.drawable.time_3, R.drawable.time_4,
				R.drawable.time_5, R.drawable.time_6, R.drawable.time_7,
				R.drawable.time_8, R.drawable.time_9, R.drawable.time_dot };

		int pos = x;

		SimpleDateFormat sdf = new SimpleDateFormat("HH-mm-ss");
		String time = sdf.format(new Date());
		time = time.substring(0, time.length() - 3);
		// canvas.drawText(time, x, y, null);
		for (int i = 0; i < time.length(); i++) {

			if (time.charAt(i) == '-') {
				bm = BitmapFactory.decodeResource(mContext.getResources(),
						imgIds[10]);
			} else {
				bm = BitmapFactory.decodeResource(mContext.getResources(),
						imgIds[time.charAt(i) - '0']);
			}
			canvas.drawBitmap(bm, pos, y, null);
			pos += bm.getWidth();
		}

	}

	public void decodeWeek() {
		Bitmap bm = null;
		int[] imgIds = { R.drawable.h111, R.drawable.h211, R.drawable.h311,
				R.drawable.h411, R.drawable.h511, R.drawable.h611,
				R.drawable.h711, R.drawable.hxq11 };

		for (int i = 0; i < imgIds.length; i++) {

			bm = BitmapFactory.decodeResource(mContext.getResources(),
					imgIds[i]);
			BmWeek.add(bm);
		}
	}

	public void newDrawWeek(Canvas canvas, int x, int y) {
		Bitmap bm = null;
		String[] weeks = { "星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日" };
		int pos = x;
		SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
		String week = sdf.format(new Date());
		// canvas.drawText(week, x, y, null);
		bm = BmWeek.get(7);
		canvas.drawBitmap(bm, pos, y, null);
		pos += bm.getWidth();

		for (int i = 0; i < weeks.length; i++) {
			if (weeks[i].equals(week)) {
				bm = BmWeek.get(i);
				canvas.drawBitmap(bm, pos, y, null);
				break;
			}
		}
	}

	public void drawWeek(Canvas canvas, int x, int y) {
		Bitmap bm = null;
		String[] weeks = { "星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日" };
		int[] imgIds = { R.drawable.h111, R.drawable.h211, R.drawable.h311,
				R.drawable.h411, R.drawable.h511, R.drawable.h611,
				R.drawable.h711, R.drawable.hxq11 };
		int pos = x;
		SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
		String week = sdf.format(new Date());
		// canvas.drawText(week, x, y, null);
		bm = BitmapFactory.decodeResource(mContext.getResources(),
				R.drawable.hxq11);
		canvas.drawBitmap(bm, pos, y, null);
		pos += bm.getWidth();

		for (int i = 0; i < weeks.length; i++) {
			if (weeks[i].equals(week)) {
				bm = BitmapFactory.decodeResource(mContext.getResources(),
						imgIds[i]);
				canvas.drawBitmap(bm, pos, y, null);
				break;
			}
		}
	}

	public void onViewDestroy() {
		// TODO Auto-generated method stub
		mContext.getContentResolver().unregisterContentObserver(
				new newMmsContentObserver(mContext.getApplicationContext(),
						new Handler()));
		mContext.getContentResolver().unregisterContentObserver(
				new MissedCallContentObserver(mContext.getApplicationContext(),
						new Handler()));
	}
}