1.将view转为bitmap
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// 将view转为bitmap
public
static
Bitmap getBitmapFromView(View view)
{
// Define a bitmap with the same size as the view
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
// Bind a canvas to it
Canvas canvas =
new
Canvas(returnedBitmap);
// Get the view's background
Drawable bgDrawable = view.getBackground();
if
(bgDrawable !=
null
)
// has background drawable, then draw it on the canvas
bgDrawable.draw(canvas);
else
// does not have background drawable, then draw white background on
// the canvas
canvas.drawColor(Color.WHITE);
// draw the view on the canvas
view.draw(canvas);
// return the bitmap
return
returnedBitmap;
}
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2.将view转为bitmap
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// 将view转为bitmap
public
static
Bitmap viewToBitmap(View view)
{
view.setDrawingCacheEnabled(
true
);
view.buildDrawingCache();
Bitmap bm = view.getDrawingCache();
return
bm;
}
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3.将xml转为bitmap
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// 将xml转为bitmap
public
static
Bitmap convertBitmapFromXML(Context context, String clusterSize, Bitmap bm)
{
View layout = LayoutInflater.from(context).inflate(R.layout.estatecartlist_item,
null
);
View bitmapView = layout.findViewById(R.id.estatecartlist_item_bitmap);
TextView xml_text = (TextView) layout.findViewById(R.id.item_estatecart_tv_name);
ImageView image = (ImageView) layout.findViewById(R.id.item_estatecart_iv_main);
image.setImageBitmap(bm);
xml_text.setText(clusterSize);
bitmapView.measure(MeasureSpec.makeMeasureSpec(
0
, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(
0
, MeasureSpec.UNSPECIFIED));
bitmapView.layout(
0
,
0
, bitmapView.getMeasuredWidth(), bitmapView.getMeasuredHeight());
final
Bitmap clusterBitmap = Bitmap.createBitmap(bitmapView.getMeasuredWidth(), bitmapView.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas =
new
Canvas(clusterBitmap);
bitmapView.draw(canvas);
return
clusterBitmap;
}
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==============参考资料===================
* 1.http://stackoverflow.com/questions/7200535/how-to-convert-views-to-bitmap
* 2.http://stackoverflow.com/questions/5536066/convert-view-to-bitmap-on-android/9595919#9595919
* 3.http://stackoverflow.com/questions/12402392/android-converting-xml-view-to-bitmap-without-showing-it
4.图片缩放与压缩
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// 按大小缩放
private
Bitmap getimage(String srcPath)
{
BitmapFactory.Options newOpts =
new
BitmapFactory.Options();
// 开始读入图片,此时把options.inJustDecodeBounds 设回true了
newOpts.inJustDecodeBounds =
true
;
Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
// 此时返回bm为空
newOpts.inJustDecodeBounds =
false
;
int
w = newOpts.outWidth;
int
h = newOpts.outHeight;
// 现在主流手机比较多是800*480分辨率,所以高和宽我们设置为
float
hh = 800f;
// 这里设置高度为800f
float
ww = 480f;
// 这里设置宽度为480f
// 缩放比。由于是固定比例缩放,只用高或者宽其中一个数据进行计算即可
int
be =
1
;
// be=1表示不缩放
if
(w > h && w > ww)
{
// 如果宽度大的话根据宽度固定大小缩放
be = (
int
) (newOpts.outWidth / ww);
}
else
if
(w < h && h > hh)
{
// 如果高度高的话根据宽度固定大小缩放
be = (
int
) (newOpts.outHeight / hh);
}
if
(be <=
0
)
be =
1
;
newOpts.inSampleSize = be;
// 设置缩放比例
// 重新读入图片,注意此时已经把options.inJustDecodeBounds 设回false了
bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
return
compressImage(bitmap);
// 压缩好比例大小后再进行质量压缩
}
// 图片质量压缩
private
static
Bitmap compressImage(Bitmap image)
{
ByteArrayOutputStream baos =
new
ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,
100
, baos);
// 质量压缩方法,这里100表示不压缩,把压缩后的数据存放到baos中
int
options =
100
;
while
(baos.toByteArray().length /
1024
>
100
)
{
// 循环判断如果压缩后图片是否大于100kb,大于继续压缩
baos.reset();
// 重置baos即清空baos
image.compress(Bitmap.CompressFormat.JPEG, options, baos);
// 这里压缩options%,把压缩后的数据存放到baos中
options -=
10
;
// 每次都减少10
}
ByteArrayInputStream isBm =
new
ByteArrayInputStream(baos.toByteArray());
// 把压缩后的数据baos存放到ByteArrayInputStream中
Bitmap bitmap = BitmapFactory.decodeStream(isBm,
null
,
null
);
// 把ByteArrayInputStream数据生成图片
return
bitmap;
}
// 图片按比例大小压缩
private
static
Bitmap comp(Bitmap image)
{
ByteArrayOutputStream baos =
new
ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,
100
, baos);
if
(baos.toByteArray().length /
1024
>
1024
)
{
// 判断如果图片大于1M,进行压缩避免在生成图片(BitmapFactory.decodeStream)时溢出
baos.reset();
// 重置baos即清空baos
image.compress(Bitmap.CompressFormat.JPEG,
50
, baos);
// 这里压缩50%,把压缩后的数据存放到baos中
}
ByteArrayInputStream isBm =
new
ByteArrayInputStream(baos.toByteArray());
BitmapFactory.Options newOpts =
new
BitmapFactory.Options();
// 开始读入图片,此时把options.inJustDecodeBounds 设回true了
newOpts.inJustDecodeBounds =
true
;
Bitmap bitmap = BitmapFactory.decodeStream(isBm,
null
, newOpts);
newOpts.inJustDecodeBounds =
false
;
int
w = newOpts.outWidth;
int
h = newOpts.outHeight;
// 现在主流手机比较多是800*480分辨率,所以高和宽我们设置为
float
hh = 800f;
// 这里设置高度为800f
float
ww = 480f;
// 这里设置宽度为480f
// 缩放比。由于是固定比例缩放,只用高或者宽其中一个数据进行计算即可
int
be =
1
;
// be=1表示不缩放
if
(w > h && w > ww)
{
// 如果宽度大的话根据宽度固定大小缩放
be = (
int
) (newOpts.outWidth / ww);
}
else
if
(w < h && h > hh)
{
// 如果高度高的话根据宽度固定大小缩放
be = (
int
) (newOpts.outHeight / hh);
}
if
(be <=
0
)
be =
1
;
newOpts.inSampleSize = be;
// 设置缩放比例
// 重新读入图片,注意此时已经把options.inJustDecodeBounds 设回false了
isBm =
new
ByteArrayInputStream(baos.toByteArray());
bitmap = BitmapFactory.decodeStream(isBm,
null
, newOpts);
return
compressImage(bitmap);
// 压缩好比例大小后再进行质量压缩
}
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5.图片转为文件
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// 图片转为文件
public
static
boolean
saveBitmap2file(Bitmap bmp, String filename)
{
CompressFormat format = Bitmap.CompressFormat.JPEG;
int
quality =
100
;
OutputStream stream =
null
;
try
{
stream =
new
FileOutputStream(
"/sdcard/"
+ filename);
}
catch
(FileNotFoundException e)
{
e.printStackTrace();
}
return
bmp.compress(format, quality, stream);
}
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6.屏幕截屏方法
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// 屏幕截屏方法 获取当前屏幕bitmap,转换成bytes[] 调用 UI分享方法
public
void
printscreen_share(View v)
{
View view1 = getWindow().getDecorView();
Display display = getWindowManager().getDefaultDisplay();
view1.layout(
0
,
0
, display.getWidth(), display.getHeight());
view1.setDrawingCacheEnabled(
true
);
Bitmap bitmap = Bitmap.createBitmap(view1.getDrawingCache());
}
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7.把Bitmap 转成 Byte
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// 把Bitmap 转成 Byte
public
static
byte
[] Bitmap2Bytes(Bitmap bm)
{
ByteArrayOutputStream baos =
new
ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG,
100
, baos);
return
baos.toByteArray();
}
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8.图片转为文件
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// 图片转为文件
public
static
boolean
saveBitmap2file(Bitmap bmp)
{
CompressFormat format = Bitmap.CompressFormat.PNG;
int
quality =
100
;
OutputStream stream =
null
;
try
{
// 判断SDcard状态
if
(!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
{
// 错误提示
return
false
;
}
// 检查SDcard空间
File SDCardRoot = Environment.getExternalStorageDirectory();
if
(SDCardRoot.getFreeSpace() <
10000
)
{
// 弹出对话框提示用户空间不够
Log.e(
"Utils"
,
"存储空间不够"
);
return
false
;
}
// 在SDcard创建文件夹及文件
File bitmapFile =
new
File(SDCardRoot.getPath() + FILE_PATH);
bitmapFile.getParentFile().mkdirs();
// 创建文件夹
stream =
new
FileOutputStream(SDCardRoot.getPath() + FILE_PATH);
// "/sdcard/"
}
catch
(FileNotFoundException e)
{
e.printStackTrace();
}
return
bmp.compress(format, quality, stream);
}
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9.下载图片
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// 下载图片
public
static
Bitmap loadImage(String... params)
{
InputStream is =
null
;
Bitmap bitmap =
null
;
try
{
URL url =
new
URL(params[
0
]);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(
5000
);
conn.setConnectTimeout(
5000
);
if
(HttpURLConnection.HTTP_OK != conn.getResponseCode())
{
// 网络连接异常
Log.e(
""
,
"loadImage连接异常"
);
return
null
;
}
is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
}
catch
(MalformedURLException e)
{
e.printStackTrace();
}
catch
(IOException e)
{
e.printStackTrace();
}
finally
{
if
(
null
!= is)
{
try
{
is.close();
}
catch
(IOException e)
{
e.printStackTrace();
}
}
}
return
bitmap;
}
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10.byte[]转换成Bitmap
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// byte[]转换成Bitmap
public
static
Bitmap Bytes2Bitmap(
byte
[] b)
{
if
(b.length !=
0
)
{
return
BitmapFactory.decodeByteArray(b,
0
, b.length);
}
return
null
;
}
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11.将字符串转换成Bitmap类型
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public
static
Bitmap stringtoBitmap(String string)
{
// 将字符串转换成Bitmap类型
Bitmap bitmap =
null
;
try
{
byte
[] bitmapArray;
bitmapArray = Base64.decode(string, Base64.DEFAULT);
bitmap = BitmapFactory.decodeByteArray(bitmapArray,
0
, bitmapArray.length);
}
catch
(Exception e)
{
e.printStackTrace();
}
return
bitmap;
}
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12.将Bitmap转换成字符串
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public
static
String bitmaptoString(Bitmap bitmap)
{
// 将Bitmap转换成字符串
String string =
null
;
ByteArrayOutputStream bStream =
new
ByteArrayOutputStream();
bitmap.compress(CompressFormat.PNG,
100
, bStream);
byte
[] bytes = bStream.toByteArray();
string = Base64.encodeToString(bytes, Base64.DEFAULT);
return
string;
}
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13.byte[]转为文件
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//byte[]转为文件
public
static
File getFileFromBytes(
byte
[] b)
{
BufferedOutputStream stream =
null
;
File file =
null
;
try
{
// 判断SDcard状态
if
(!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
{
// 错误提示
return
null
;
}
// 检查SDcard空间
File SDCardRoot = Environment.getExternalStorageDirectory();
if
(SDCardRoot.getFreeSpace() <
10000
)
{
// 弹出对话框提示用户空间不够
Log.e(
"Utils"
,
"存储空间不够"
);
return
null
;
}
// 在SDcard创建文件夹及文件
File bitmapFile =
new
File(SDCardRoot.getPath() + FILE_PATH);
bitmapFile.getParentFile().mkdirs();
// 创建文件夹
FileOutputStream fstream =
new
FileOutputStream(bitmapFile);
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;
}
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14.图片压缩
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//图片缩放
public
static
Bitmap scaleDownBitmap(Bitmap photo,
int
newHeight, Context context)
{
final
float
densityMultiplier = context.getResources().getDisplayMetrics().density;
int
h = (
int
) (newHeight * densityMultiplier);
int
w = (
int
) (h * photo.getWidth() / ((
double
) photo.getHeight()));
photo = Bitmap.createScaledBitmap(photo, w, h,
true
);
return
photo;
}
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15.将byte[]转换成InputStream
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// 将byte[]转换成InputStream
public
InputStream Byte2InputStream(
byte
[] b)
{
ByteArrayInputStream bais =
new
ByteArrayInputStream(b);
return
bais;
}
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16.将InputStream转换成byte[]
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// 将InputStream转换成byte[]
public
byte
[] InputStream2Bytes(InputStream is)
{
String str =
""
;
byte
[] readByte =
new
byte
[
1024
];
int
readCount = -
1
;
try
{
while
((readCount = is.read(readByte,
0
,
1024
)) != -
1
)
{
str +=
new
String(readByte).trim();
}
return
str.getBytes();
}
catch
(Exception e)
{
e.printStackTrace();
}
return
null
;
}
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17.将Bitmap转换成InputStream
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// 将Bitmap转换成InputStream
public
InputStream Bitmap2InputStream(Bitmap bm)
{
ByteArrayOutputStream baos =
new
ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG,
100
, baos);
InputStream is =
new
ByteArrayInputStream(baos.toByteArray());
return
is;
}
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18.将Bitmap转换成InputStream
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// 将Bitmap转换成InputStream
public
InputStream Bitmap2InputStream(Bitmap bm,
int
quality)
{
ByteArrayOutputStream baos =
new
ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, quality, baos);
InputStream is =
new
ByteArrayInputStream(baos.toByteArray());
return
is;
}
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19.将InputStream转换成Bitmap
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// 将InputStream转换成Bitmap
public
Bitmap InputStream2Bitmap(InputStream is)
{
return
BitmapFactory.decodeStream(is);
}
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20.Drawable转换成InputStream
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// Drawable转换成InputStream
public
InputStream Drawable2InputStream(Drawable d)
{
Bitmap bitmap =
this
.drawable2Bitmap(d);
return
this
.Bitmap2InputStream(bitmap);
}
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21.InputStream转换成Drawable
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// InputStream转换成Drawable
public
Drawable InputStream2Drawable(InputStream is)
{
Bitmap bitmap =
this
.InputStream2Bitmap(is);
return
this
.bitmap2Drawable(bitmap);
}
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22.Drawable转换成byte[]
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// Drawable转换成byte[]
public
byte
[] Drawable2Bytes(Drawable d)
{
Bitmap bitmap =
this
.drawable2Bitmap(d);
return
this
.Bitmap2Bytes(bitmap);
}
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23.byte[]转换成Drawable
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// byte[]转换成Drawable
public
Drawable Bytes2Drawable(
byte
[] b)
{
Bitmap bitmap =
this
.Bytes2Bitmap(b);
return
this
.bitmap2Drawable(bitmap);
}
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24.Drawable转换成Bitmap
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// Drawable转换成Bitmap
public
Bitmap drawable2Bitmap(Drawable drawable)
{
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
Canvas canvas =
new
Canvas(bitmap);
drawable.setBounds(
0
,
0
, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return
bitmap;
}
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25.Bitmap转换成Drawable
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// Bitmap转换成Drawable
public
Drawable bitmap2Drawable(Bitmap bitmap)
{
BitmapDrawable bd =
new
BitmapDrawable(bitmap);
Drawable d = (Drawable) bd;
return
d;
}
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本文转自 glblong 51CTO博客,原文链接:http://blog.51cto.com/glblong/1304090,如需转载请自行联系原作者