学步园

Copy from Camra app：

<br /> import java.io.File;<br /> import java.io.FileNotFoundException;<br /> import java.io.FileOutputStream;<br /> import java.io.IOException;<br /> import java.io.OutputStream;<br /> import android.content.ContentResolver;<br /> import android.content.ContentValues;<br /> import android.graphics.Bitmap;<br /> import android.graphics.Bitmap.CompressFormat;<br /> import android.location.Location;<br /> import android.media.ExifInterface;<br /> import android.net.Uri;<br /> import android.os.Environment;<br /> import android.provider.MediaStore.Images;<br /> import android.util.Log;<br /> public class ImageManager {<br /> private static final String TAG = "ImageManager";<br /> private static final Uri STORAGE_URI = Images.Media.EXTERNAL_CONTENT_URI;</p> <p> public static final String CAMERA_IMAGE_BUCKET_NAME =<br /> Environment.getExternalStorageDirectory().toString()<br /> + "/DCIM/Camera";<br /> private ImageManager() {<br /> }</p> <p> private static boolean checkFsWritable() {<br /> // Create a temporary file to see whether a volume is really writeable.<br /> // It's important not to put it in the root directory which may have a<br /> // limit on the number of files.<br /> String directoryName =<br /> Environment.getExternalStorageDirectory().toString() + "/DCIM";<br /> File directory = new File(directoryName);<br /> if (!directory.isDirectory()) {<br /> if (!directory.mkdirs()) {<br /> return false;<br /> }<br /> }<br /> return directory.canWrite();<br /> }<br /> public static boolean hasStorage() {<br /> return hasStorage(true);<br /> }<br /> public static boolean hasStorage(boolean requireWriteAccess) {<br /> String state = Environment.getExternalStorageState();<br /> if (Environment.MEDIA_MOUNTED.equals(state)) {<br /> if (requireWriteAccess) {<br /> boolean writable = checkFsWritable();<br /> return writable;<br /> } else {<br /> return true;<br /> }<br /> } else if (!requireWriteAccess<br /> && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {<br /> return true;<br /> }<br /> return false;<br /> }</p> <p> public static int getExifOrientation(String filepath) {<br /> int degree = 0;<br /> ExifInterface exif = null;<br /> try {<br /> exif = new ExifInterface(filepath);<br /> } catch (IOException ex) {<br /> Log.e(TAG, "cannot read exif", ex);<br /> }<br /> if (exif != null) {<br /> int orientation = exif.getAttributeInt(<br /> ExifInterface.TAG_ORIENTATION, -1);<br /> if (orientation != -1) {<br /> // We only recognize a subset of orientation tag values.<br /> switch(orientation) {<br /> case ExifInterface.ORIENTATION_ROTATE_90:<br /> degree = 90;<br /> break;<br /> case ExifInterface.ORIENTATION_ROTATE_180:<br /> degree = 180;<br /> break;<br /> case ExifInterface.ORIENTATION_ROTATE_270:<br /> degree = 270;<br /> break;<br /> }<br /> }<br /> }<br /> return degree;<br /> }</p> <p> //<br /> // Stores a bitmap or a jpeg byte array to a file (using the specified<br /> // directory and filename). Also add an entry to the media store for<br /> // this picture. The title, dateTaken, location are attributes for the<br /> // picture. The degree is a one element array which returns the orientation<br /> // of the picture.<br /> //<br /> public static Uri addImage(ContentResolver cr, String title, long dateTaken,<br /> Location location, String directory, String filename,<br /> Bitmap source, byte[] jpegData, int[] degree) {<br /> // We should store image data earlier than insert it to ContentProvider,<br /> // otherwise we may not be able to generate thumbnail in time.<br /> OutputStream outputStream = null;<br /> String filePath = directory + "/" + filename;<br /> try {<br /> File dir = new File(directory);<br /> if (!dir.exists()) dir.mkdirs();<br /> File file = new File(directory, filename);<br /> outputStream = new FileOutputStream(file);<br /> if (source != null) {<br /> source.compress(CompressFormat.JPEG, 100, outputStream);<br /> degree[0] = 0;<br /> } else {<br /> outputStream.write(jpegData);<br /> degree[0] = getExifOrientation(filePath);<br /> }<br /> } catch (FileNotFoundException ex) {<br /> Log.w(TAG, ex);<br /> return null;<br /> } catch (IOException ex) {<br /> Log.w(TAG, ex);<br /> return null;<br /> } finally {<br /> Utils.closeSilently(outputStream);<br /> }<br /> // Read back the compressed file size.<br /> long size = new File(directory, filename).length();<br /> ContentValues values = new ContentValues(9);<br /> values.put(Images.Media.TITLE, title);<br /> // That filename is what will be handed to Gmail when a user shares a<br /> // photo. Gmail gets the name of the picture attachment from the<br /> // "DISPLAY_NAME" field.<br /> values.put(Images.Media.DISPLAY_NAME, filename);<br /> values.put(Images.Media.DATE_TAKEN, dateTaken);<br /> values.put(Images.Media.MIME_TYPE, "image/jpeg");<br /> values.put(Images.Media.ORIENTATION, degree[0]);<br /> values.put(Images.Media.DATA, filePath);<br /> values.put(Images.Media.SIZE, size);<br /> if (location != null) {<br /> values.put(Images.Media.LATITUDE, location.getLatitude());<br /> values.put(Images.Media.LONGITUDE, location.getLongitude());<br /> }<br /> return cr.insert(STORAGE_URI, values);<br /> }<br /> }<br />  

使用方法，如保存指定View到图片文件中：

MainView mMainView = (MainView) findViewById(R.id.main_back); </p> <p> if (false == mMainView.isDrawingCacheEnabled()) {<br /> mMainView.setDrawingCacheEnabled(true);<br /> }</p> <p> Bitmap bitmap = mMainView.getDrawingCache();<br /> // storeImageToFile(bitmap);<br /> storeImage(bitmap, null);<br /> mMainView.setDrawingCacheEnabled(false);</p> <p> Toast.makeText(mContext, "Save photo: " + mLastContentUri, Toast.LENGTH_SHORT).show();