我在Android开发新的。 我想从拿Android摄像头工具的图像，然后保存为缩略图，并保存为全尺寸（调整尺寸和裁剪用户自定义）。
其实我是想在缩略图显示GridView从SD卡中的一个文件夹，然后单击一个图像，然后显示全尺寸（1536×2048）图像在一个窗口，从SD卡的另一个文件夹。
我在谷歌搜索，但没有获得绝对的例子或教程这是比赛的两个条件。
例如
developer.android.com/training/camera/photobasics.html#TaskPath
正与摄像头的Android编程图片
从照相机和显示器在活动捕获图像
请人帮助我，怎么可能这样。 如果我的概念不匹配，然后修改更新我的问题。 请人帮助我。
按照波纹管的步骤： -
1： -
private Bitmap getScaledBitMap(String filePath, int reqWidth, int reqHeight) {
if (filePath != null && filePath.contains("file")) {
filePath = filePath.replace("file://", "");
}
Bitmap unscaledBitmap = ScalingUtilities.decodeBitmap(getResources(), filePath, reqWidth, reqHeight, ScalingLogic.CROP);
// Part 2: Scale image
Bitmap scaledBitmap = ScalingUtilities.createScaledBitmap(unscaledBitmap, reqWidth,reqHeight, ScalingLogic.CROP);
unscaledBitmap.recycle();
return scaledBitmap;
}
2： -
public class ScalingUtilities {
/**
* Utility function for decoding an image resource. The decoded bitmap will
* be optimized for further scaling to the requested destination dimensions
* and scaling logic.
*
* @param res The resources object containing the image data
* @param resId The resource id of the image data
* @param dstWidth Width of destination area
* @param dstHeight Height of destination area
* @param scalingLogic Logic to use to avoid image stretching
* @return Decoded bitmap
*/
public static Bitmap decodeBitmap(Resources res, String pathName, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Options options = new Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(pathName, options);
options.inJustDecodeBounds = false;
options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, dstWidth,
dstHeight, scalingLogic);
Bitmap unscaledBitmap = BitmapFactory.decodeFile(pathName, options);
return unscaledBitmap;
}
/**
* Utility function for creating a scaled version of an existing bitmap
*
* @param unscaledBitmap Bitmap to scale
* @param dstWidth Wanted width of destination bitmap
* @param dstHeight Wanted height of destination bitmap
* @param scalingLogic Logic to use to avoid image stretching
* @return New scaled bitmap object
*/
public static Bitmap createScaledBitmap(Bitmap unscaledBitmap, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Rect srcRect = calculateSrcRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
dstWidth, dstHeight, scalingLogic);
Rect dstRect = calculateDstRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
dstWidth, dstHeight, scalingLogic);
Bitmap scaledBitmap = Bitmap.createBitmap(dstRect.width(), dstRect.height(),
Config.ARGB_8888);
Canvas canvas = new Canvas(scaledBitmap);
canvas.drawBitmap(unscaledBitmap, srcRect, dstRect, new Paint(Paint.FILTER_BITMAP_FLAG));
return scaledBitmap;
}
/**
* ScalingLogic defines how scaling should be carried out if source and
* destination image has different aspect ratio.
*
* CROP: Scales the image the minimum amount while making sure that at least
* one of the two dimensions fit inside the requested destination area.
* Parts of the source image will be cropped to realize this.
*
* FIT: Scales the image the minimum amount while making sure both
* dimensions fit inside the requested destination area. The resulting
* destination dimensions might be adjusted to a smaller size than
* requested.
*/
public static enum ScalingLogic {
CROP, FIT
}
/**
* Calculate optimal down-sampling factor given the dimensions of a source
* image, the dimensions of a destination area and a scaling logic.
*
* @param srcWidth Width of source image
* @param srcHeight Height of source image
* @param dstWidth Width of destination area
* @param dstHeight Height of destination area
* @param scalingLogic Logic to use to avoid image stretching
* @return Optimal down scaling sample size for decoding
*/
public static int calculateSampleSize(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.FIT) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return srcWidth / dstWidth;
} else {
return srcHeight / dstHeight;
}
} else {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return srcHeight / dstHeight;
} else {
return srcWidth / dstWidth;
}
}
}
/**
* Calculates source rectangle for scaling bitmap
*
* @param srcWidth Width of source image
* @param srcHeight Height of source image
* @param dstWidth Width of destination area
* @param dstHeight Height of destination area
* @param scalingLogic Logic to use to avoid image stretching
* @return Optimal source rectangle
*/
public static Rect calculateSrcRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.CROP) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
final int srcRectWidth = (int)(srcHeight * dstAspect);
final int srcRectLeft = (srcWidth - srcRectWidth) / 2;
return new Rect(srcRectLeft, 0, srcRectLeft + srcRectWidth, srcHeight);
} else {
final int srcRectHeight = (int)(srcWidth / dstAspect);
final int scrRectTop = (int)(srcHeight - srcRectHeight) / 2;
return new Rect(0, scrRectTop, srcWidth, scrRectTop + srcRectHeight);
}
} else {
return new Rect(0, 0, srcWidth, srcHeight);
}
}
/**
* Calculates destination rectangle for scaling bitmap
*
* @param srcWidth Width of source image
* @param srcHeight Height of source image
* @param dstWidth Width of destination area
* @param dstHeight Height of destination area
* @param scalingLogic Logic to use to avoid image stretching
* @return Optimal destination rectangle
*/
public static Rect calculateDstRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.FIT) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return new Rect(0, 0, dstWidth, (int)(dstWidth / srcAspect));
} else {
return new Rect(0, 0, (int)(dstHeight * srcAspect), dstHeight);
}
} else {
return new Rect(0, 0, dstWidth, dstHeight);
}
}
}
保存该位图到所需的文件夹。
创建文件
私人最终诠释CAMERA_PIC_REQUEST = 0;
private String createNewFile()
{
String dirctory = Environment.getExternalStorageDirectory()+"/"+"test";
File f = new File(dirctory);
boolean isdirectory;
if(!f.isDirectory())
{
isdirectory = f.mkdir();
}else
{
isdirectory = true;
}
if(isdirectory)
{
dirctory = dirctory +"/"+Calendar.getInstance().getTimeInMillis()+"captureImage.jpg";
f = new File(dirctory);
if(f.isFile())
f.delete();
try {
f.createNewFile();
return dirctory;
} catch (Exception e) {
Utility.Toast(mActivity, "Unable to create File");
e.printStackTrace();
}
}else
{
Utiity.Toast(AgentSignUp.this, "Unable to create Directory");
}
return dirctory;
}
第2步：火的意图：
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); file_image = createNewFile(); if(file_image!=null) { File file = new File(file_image); Uri outputFileUri = Uri.fromFile( file ); cameraIntent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri ); } startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
步骤3：在收到结果onActivity（检查sucess和失败）
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if(resultCode==RESULT_OK) { if(requestCode==CAMERA_PIC_REQUEST) { File file = new File(file_image); Uri outputFileUri = Uri.fromFile( file ); doCrop(outputFileUri);// send to cropper or you can use this uri for upper code to get two size of images } } super.onActivityResult(requestCode, resultCode, data); }
![Prime Path[POJ3126] [SPFA/BFS]](https://oscimg.oschina.net/oscnet/e1200f32e838bf1d387d671dc8e6894c37d.jpg "Prime Path[POJ3126] [SPFA/BFS]")
