根據(jù)屏幕縮放圖片

// 由url獲取bitmap對(duì)象

is = conn.getInputStream(); // 簡(jiǎn)寫方法:is = params[0].openStream()

BitmapFactory.Options newOpts = new BitmapFactory.Options()；

bitmap = BitmapFactory.decodeStream(is, null ,

newOpts);

// newOpts.inJustDecodeBounds = false;

// bitmap = BitmapFactory.decodeStream(is);

newOpts.inJustDecodeBounds = false;

Matrix matrix = new Matrix();

int w = newOpts.outWidth;

int h = newOpts.outHeight;

WindowManager manage = getWindowManager();

Display display = manage.getDefaultDisplay();

float hh = display.getHeight();

float ww = display.getWidth();

// Log.e("display.getWidth()t", "display.getWidth()" + ww);

// Log.e("display.getHeight()", "display.getHeight()" + hh);

// Log.e("bitmap.getWidth()", "bitmap.getWidth()" + w);

// Log.e("bitmap.getHeight()", "bitmap.getHeight()" + h);

// int hh = 800;// 這里設(shè)置高度為800f

// int ww = 480;// 這里設(shè)置寬度為480f

// 縮放比。由于是固定比例縮放，只用高或者寬其中一個(gè)數(shù)據(jù)進(jìn)行計(jì)算即可

float be = 1;// be=1表示不縮放

if ( w > ww)

{// 如果寬度大的話根據(jù)寬度固定大小縮放

be = (float) (w / ww);

Log.e("matrix0.", "matrix0." + be);

newbmp = compressImage(bitmap);

return newbmp;

}

else if (w < ww )

{

be = (float) (ww / w);

Log.e("matrix1.", "matrix1." + be);

}

else if (w < h && h > hh)

{// 如果高度高的話根據(jù)高度固定大小縮放

be = (int) (h / hh);

Log.e("matrix2.", "matrix2." + be);

}

if (be <= 0)

be = 1;

// newOpts.inSampleSize = (int) be;//設(shè)置縮放比例

Log.e("matrix.postScale", "matrix.postScale" + be);

matrix.postScale(be, be);

// newOpts.inSampleSize = (int) be;// 設(shè)置縮放比例

// 重新讀入圖片，注意此時(shí)已經(jīng)把options.inJustDecodeBounds 設(shè)回false了

// bitmap = BitmapFactory.decodeStream(is, null ,

// newOpts);

bitmap = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);

newbmp = compressImage(bitmap);// 壓縮好比例大小后再進(jìn)行質(zhì)量壓縮

mCacheMap.put(strURL, newbmp);

/**

* 質(zhì)量壓縮

*

* @param p_w_picpath

* @return

*/

private Bitmap compressImage(Bitmap p_w_picpath)

{

ByteArrayOutputStream baos = new ByteArrayOutputStream();

p_w_picpath.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 質(zhì)量壓縮方法，這里100表示不壓縮，把壓縮后的數(shù)據(jù)存放到baos中

int options = 100;

while (baos.toByteArray().length / 1024 > 100)

{ // 循環(huán)判斷如果壓縮后圖片是否大于100kb,大于繼續(xù)壓縮

baos.reset();// 重置baos即清空baos

options -= 10;// 每次都減少10

p_w_picpath.compress(Bitmap.CompressFormat.JPEG, options, baos);// 這里壓縮options%，把壓縮后的數(shù)據(jù)存放到baos中

}

ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把壓縮后的數(shù)據(jù)baos存放到ByteArrayInputStream中

Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream數(shù)據(jù)生成圖片

// try {

// FileOutputStream out = new

// FileOutputStream(Environment.getExternalStorageDirectory()

// + "/faceImage1.jpg");

// Log.i("path",

// Environment.getExternalStorageDirectory()+"/faceImage1.jpg");

// bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);

// }

// catch (Exception e) {

// e.printStackTrace();

// }

return bitmap;

}