Android学习之——（2）项目中的网络连接相关以及Bit地图处理学习

/** * 检查网络是否可用 *  * @param context * @return */public static boolean detect(Context context) {    ConnectivityManager manager = (ConnectivityManager) context            .getApplicationContext().getSystemService(                    Context.CONNECTIVITY_SERVICE);    if (manager == null) {        return false;    }    NetworkInfo networkinfo = manager.getActiveNetworkInfo();     if (networkinfo == null || !networkinfo.isAvailable()) {        return false;    }    return true;}

/** * 检查当前WIFI是否连接，两层意思——是否连接，连接是不是WIFI * @param context * @return true表示当前网络处于连接状态，且是WIFI，否则返回false */public static boolean isWifiConnected(Context context) {    ConnectivityManager cm = (ConnectivityManager) context    .getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo info = cm.getActiveNetworkInfo();    if (info != null && info.isConnected()    && ConnectivityManager.TYPE_WIFI == info.getType()) {        return true;    }    return false;}

/** * 检查当前GPRS是否连接，两层意思——是否连接，连接是不是GPRS * @param context * @return true表示当前网络处于连接状态，且是GPRS，否则返回false */public static boolean isGprsConnected(Context context) {    ConnectivityManager cm = (ConnectivityManager) context    .getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo info = cm.getActiveNetworkInfo();    if (info != null && info.isConnected()    && ConnectivityManager.TYPE_MOBILE == info.getType()) {        return true;    }    return false;}

/** * 检查当前是否连接 * @param context * @return true表示当前网络处于连接状态，否则返回false */public static boolean isConnected(Context context) {    ConnectivityManager cm = (ConnectivityManager) context    .getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo info = cm.getActiveNetworkInfo();    if (info != null && info.isConnected()) {        return true;    }    return false;}

二、Bitmap 工具类相关记录

package com.example.syc_util;import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Bitmap.CompressFormat;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.BitmapFactory.Options;import android.graphics.PorterDuff.Mode;import android.os.Environment;import android.util.Log;import android.widget.Toast;public class BitmapTools {	/**	 * 根据输入流获取位图对象	 * 	 * @param is	 * @return	 */	public static Bitmap getBitmap(InputStream is) {		return BitmapFactory.decodeStream(is);	}	/**	 * 根据输入流和 缩小比例 获取位图对象	 * 	 * @param is	 * @param scale	 * @return	 */	public static Bitmap getBitmap(InputStream is, int scale) {		Bitmap bitmap = null;		Options opts = new Options();		opts.inSampleSize = scale;		bitmap = BitmapFactory.decodeStream(is, null, opts);		return bitmap;	}	/**	 * 根据指定的宽高 保持纵横比 缩小读取指定图片	 * 	 * @param bytes	 * @param width	 * @param height	 * @return	 */	public static Bitmap getBitmap(byte[] bytes, int width, int height) {		Bitmap bitmap = null;		Options opts = new Options();		opts.inJustDecodeBounds = true;		bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, opts);		opts.inJustDecodeBounds = false;		int scaleX = opts.outWidth / width;		int scaleY = opts.outHeight / height;		int scale = scaleX > scaleY ? scaleX : scaleY;		opts.inSampleSize = scale;		Log.i("info", "scale : " + scale);		bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, opts);		return bitmap;	}	/**	 * 根据指定的宽高 等比例 缩小读取指定路径的图片	 * 	 * @param fileName	 *            文件名	 * @param width	 *            宽	 * @param height	 *            高	 * @return	 */	public static Bitmap getBitmap(String fileName, int width, int height) {		// 绝对路径		String abPath =fileName;		BitmapFactory.Options options = new BitmapFactory.Options();		options.inJustDecodeBounds = true;		// 通过这个bitmap获取图片的宽和高		Bitmap bitmap = BitmapFactory.decodeFile(abPath, options);		// if (bitmap == null)		// {		// System.out.println("bitmap为空");		// }		float realWidth = options.outWidth;		float realHeight = options.outHeight;		if (realHeight == 0 || realWidth == 0) {			return null;		}		// System.out.println("真实图片高度：" + realHeight + "宽度:" + realWidth);		// 计算缩放比		int scaleX = options.outWidth / width;		int scaleY = options.outHeight / height;		int scale = scaleX > scaleY ? scaleX : scaleY;		options.inSampleSize = scale;		// }		// else if(flag==1){		// options.outWidth=width;		// options.outHeight=height;		// }		options.inJustDecodeBounds = false;		// 注意这次要把options.inJustDecodeBounds 设为 false,这次图片是要读取出来的。		bitmap = BitmapFactory.decodeFile(abPath, options);		int w = bitmap.getWidth();		int h = bitmap.getHeight();		System.out.println("缩略图高度：" + h + "宽度:" + w);		return bitmap;	}	/**	 * 根据指定的宽高 缩小读取指定路径的图片	 * 	 * @param fileName	 *            文件名	 * @param width	 *            宽	 * @param height	 *            高	 * @return	 */	public static Bitmap getBitmapDeng(String fileName, int width, int height) {		// 绝对路径		String abPath =  fileName;		BitmapFactory.Options options = new BitmapFactory.Options();		options.inJustDecodeBounds = true;		// 通过这个bitmap获取图片的宽和高		Bitmap bitmap = BitmapFactory.decodeFile(abPath, options);		// if (bitmap == null)		// {		// System.out.println("bitmap为空");		// }		float realWidth = options.outWidth;		float realHeight = options.outHeight;		if (realHeight == 0 || realWidth == 0) {			return null;		}		// System.out.println("真实图片高度：" + realHeight + "宽度:" + realWidth);		// 计算缩放比		float scaleX = width/realWidth ;		float scaleY =  height/realHeight ;		int scale = (int) (scaleX > scaleY ? scaleX : scaleY);		options.inSampleSize = scale;		Matrix matrix = new Matrix();		// float scaleWidth = ((float) w / width);		// float scaleHeight = ((float) h / height);		matrix.postScale(scaleX, scaleY);		// }		// else if(flag==1){		// options.outWidth=width;		// options.outHeight=height;		// }		options.inJustDecodeBounds = false;		// 注意这次要把options.inJustDecodeBounds 设为 false,这次图片是要读取出来的。		bitmap = BitmapFactory.decodeFile(abPath, options);		bitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height,				matrix, true);//		int w = bitmap.getWidth();//		int h = bitmap.getHeight();//		System.out.println("缩略图高度：" + h + "宽度:" + w);		return bitmap;	}	/**	 * 根据指定的高度比例，拉伸读取指定图片	 * 	 * @param bytes	 * @param width	 * @param height	 * @return	 */	public static Bitmap getBitmap(byte[] bytes, int height) {		Bitmap bitmap = null;		Options opts = new Options();		opts.inJustDecodeBounds = true;		bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, opts);		opts.inJustDecodeBounds = false;		// int scaleX = opts.outWidth / width;		// int scaleY = opts.outHeight / height;		// int scale = scaleX > scaleY ? scaleX : scaleY;		opts.outHeight = opts.outHeight * height;		// Log.i("info", "scale : " + scale);		bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, opts);		return bitmap;	}	public static byte[] Bitmap2Bytes(Bitmap bm) {		ByteArrayOutputStream baos = new ByteArrayOutputStream();		bm.compress(Bitmap.CompressFormat.PNG, 100, baos);		return baos.toByteArray();	}	/**	 * 根据路径 从文件中读取位图对象	 * 	 * @param path	 * @return	 */	public static Bitmap getbiBitmap(String path) {		Bitmap bitmap = null;		bitmap = BitmapFactory.decodeFile(path);		return bitmap;	}	/**	 * 保存位图对象到指定位置	 * 	 * @param path	 * @param bitmap	 * @throws IOException	 */	public static void saveBitmap(String path, Bitmap bitmap)			throws IOException {		if (path != null && bitmap != null) {			File file = new File(path);			if (!file.exists()) {				file.getParentFile().mkdirs();				file.createNewFile();			}			OutputStream stream = new FileOutputStream(file);			String name = file.getName();			String end = name.substring(name.lastIndexOf(".") + 1);			if ("png".equals(end)) {				bitmap.compress(CompressFormat.PNG, 100, stream);			} else {				bitmap.compress(CompressFormat.JPEG, 100, stream);			}		}	}	/**	 * @param 将图片内容解析成字节数组	 * @param inStream	 * @return byte[]	 * @throws Exception	 */	public static byte[] readStream(InputStream inStream) throws Exception {		byte[] buffer = new byte[1024];		int len = -1;		ByteArrayOutputStream outStream = new ByteArrayOutputStream();		while ((len = inStream.read(buffer)) != -1) {			outStream.write(buffer, 0, len);		}		byte[] data = outStream.toByteArray();		outStream.close();		inStream.close();		return data;	}	/**	 * @param 将字节数组转换为ImageView可调用的Bitmap对象	 * @param bytes	 * @param opts	 * @return Bitmap	 */	public static Bitmap getPicFromBytes(byte[] bytes,			BitmapFactory.Options opts) {		if (bytes != null)			if (opts != null)				return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,						opts);			else				return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);		return null;	}	/**	 * @param 图片缩放	 * @param bitmap	 *            对象	 * @param w	 *            要缩放的宽度	 * @param h	 *            要缩放的高度	 * @return newBmp 新 Bitmap对象	 */	public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {		int width = bitmap.getWidth();		int height = bitmap.getHeight();		Matrix matrix = new Matrix();		float scaleWidth = ((float) w / width);		float scaleHeight = ((float) h / height);		matrix.postScale(scaleWidth, scaleHeight);		Bitmap newBmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,				matrix, true);		return newBmp;	}	/**	 * @param 等比图片缩放	 * @param bitmap	 *            对象	 * @param w	 *            要缩放的宽度	 * @param h	 *            要缩放的高度	 * @return newBmp 新 Bitmap对象	 */	public static Bitmap zoomBitmapDeng(Bitmap bitmap, int w, int h) {		int width = bitmap.getWidth();		int height = bitmap.getHeight();		Matrix matrix = new Matrix();		float scaleWidth = ((float) w / width);		float scaleHeight = ((float) h / height);		float scale = scaleWidth > scaleHeight ? scaleWidth : scaleHeight;		matrix.postScale(scale, scale);		Bitmap newBmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,				matrix, true);		bitmap.recycle();		return newBmp;	}	/**	 * @param 等比图片缩放	 * @param bitmap	 *            对象	 * @param scale	 *            等比缩放的比例	 * @return newBmp 新 Bitmap对象	 */	public static Bitmap zoomBitmap(Bitmap bitmap, float scale) {		int width = bitmap.getWidth();		int height = bitmap.getHeight();		Matrix matrix = new Matrix();		// float scaleWidth = ((float) w / width);		// float scaleHeight = ((float) h / height);		matrix.postScale(scale, scale);		Bitmap newBmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,				matrix, true);		return newBmp;	}	/**	 * // * 把Bitmap转Byte // * @Author HEH // * @EditTime 2010-07-19 上午11:45:56	 * //	 */	// public static byte[] Bitmap2Bytes(Bitmap bm){	// ByteArrayOutputStream baos = new ByteArrayOutputStream();	// bm.compress(Bitmap.CompressFormat.PNG, 100, baos);	// return baos.toByteArray();	// }	/**	 * 把字节数组保存为一个文件	 * 	 * @Author HEH	 * @EditTime 2010-07-19 上午11:45:56	 */	public static File getFileFromBytes(byte[] b, String outputFile) {		BufferedOutputStream stream = null;		File file = null;		try {			file = new File(outputFile);			FileOutputStream fstream = new FileOutputStream(file);			stream = new BufferedOutputStream(fstream);			stream.write(b);		} catch (Exception e) {			e.printStackTrace();		} finally {			if (stream != null) {				try {					stream.close();				} catch (IOException e1) {					e1.printStackTrace();				}			}		}		return file;	}	/**	 * 获取圆角位图的方法	 * 	 * @param bitmap	 *            需要转化成圆角的位图	 * @param pixels	 *            圆角的度数，数值越大，圆角越大	 * @return 处理后的圆角位图	 */	public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {		Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),				bitmap.getHeight(), Config.ARGB_8888);		Canvas canvas = new Canvas(output);//		final int color = 0x00FFFFFF;		final Paint paint = new Paint();		final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());		final RectF rectF = new RectF(rect);		final float roundPx = pixels;		paint.setAntiAlias(true);		canvas.drawARGB(0, 0, 0, 0);//		paint.setColor(color);		canvas.drawRoundRect(rectF, roundPx, roundPx, paint);		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));		canvas.drawBitmap(bitmap, rect, rect, paint);		return output;	}	/**	 * 得到图片路径	 * 	 * @param fileItem	 * @return 图片路径	 */	public static String getPicture(int fileItem, Context context) {		String status = Environment.getExternalStorageState();		if (!status.equals(Environment.MEDIA_MOUNTED)) {// 判断是否有SD卡			Toast.makeText(context, "请插入SD卡", Toast.LENGTH_LONG).show();			return null;		}//		String date = MyDate.getMyNowDate("yyyy_MM_dd_");//		//		BMapApiDemoApp app=(BMapApiDemoApp) context.getApplicationContext();//		// 文件名//		String fileName = date + fileItem+"_"+app.getName() + ".png";//		File f = new File(YinShiToadyAct.PHOTO_DIR, fileName);		//boolean exist = f.exists();//		if (!exist) {//			return null;//		}		// Log.i("exist", exist+"");		//return fileName;		return null;	}}