通过传入图片url获取位图方法
public Bitmap returnBitMap(String url) {
URL myFileUrl = null;
Bitmap bitmap = null;
try {
myFileUrl = new URL(url);
}
catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
}
catch (IOException e) {
e.printStackTrace();
}
Log.v(tag, bitmap.toString());
return bitmap;
}
通过传入位图，新的宽、高比进行位图的缩放操作
public static Drawable resizeImage(Bitmap bitmap, int w, int h) {
Bitmap BitmapOrg = bitmap;
int width = BitmapOrg.getWidth();
int height = BitmapOrg.getHeight();
int newWidth = w;
int newHeight = h;
Log.v(tag, String.valueOf(width));
Log.v(tag, String.valueOf(height));
Log.v(tag, String.valueOf(newWidth));
Log.v(tag, String.valueOf(newHeight));
// calculate the scale
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// create a matrix for the manipulation
Matrix matrix = new Matrix();
// resize the Bitmap
matrix.postScale(scaleWidth, scaleHeight);
// if you want to rotate the Bitmap
// matrix.postRotate(45);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
height, matrix, true);
// make a Drawable from Bitmap to allow to set the Bitmap
// to the ImageView, ImageButton or what ever
return new BitmapDrawable(resizedBitmap);
}
加载本地图片
/*
*@param context：主运行函数实例
*@param bitAdress：图片地址，一般指向R下的drawable目录
*@return
*/
public final Bitmap CreatImage(Context context, int bitAdress) {
Bitmap bitmaptemp = null;
bitmaptemp = BitmapFactory.decodeResource(context.getResources(),bitAdress);
return bitmaptemp;
}
图片平均分割方法，将大图平均分割为N行N列，方便用户使用
/*
* @param g ：画布 paint：画笔 imgBit：图片 x
* x：X轴起点坐标 y：Y轴起点坐标 w：单一图片的宽度 h：单一图片的高度 line：第几列 row：第几行
*/
public final void cutImage(Canvas g, Paint paint, Bitmap imgBit, int x, int y, int w, int h, int line, int row) {
g.clipRect(x, y, x + w, h + y);
g.drawBitmap(imgBit, xline * w, yrow * h, paint);
g.restore();
}
