将Base64字符串解码和编码为位图时发生OutOfMemoryError
问题内容：
我试图decode和encode一个Bitmap图像。在某些设备上，它可以完美运行，而在其他设备上，则不能。我正在上传Base64 String到服务器并Base64 String从服务器获取。我找到了各种解决方案，但仍然无法解决我的问题。这是我的代码：
编码方式：
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
getActivity().startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
//Image loading from Gallery
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK
&& null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);
cursor.close();
imageView1.setImageBitmap(BitmapFactory.decodeFile(picturePath));
if (picturePath != null && !TextUtils.isEmpty(picturePath)) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap bitmap = BitmapFactory.decodeFile(picturePath, options);
base64ImageSend = ImageBase64.encodeTobase64(bitmap);
Log.i("Base 64 Image", base64ImageSend);
} else {
base64ImageSend = "";
}
}
}
解码：
private String base64StringReceive = "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEB AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/wAARCADhAOEDASIA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA AwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx BhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElK U1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3 uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwD+/iii igAooooAKKKKACiiigAooriPH/xB8GfC7wd4i+IPj3XbHw54T8J6e+p+INe1BilnYaerFWkdgc8n 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button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap bitmap = ImageBase64.decodeBase64(base64StringReceive,MainActivity.this);
imageView2.setImageBitmap(bitmap);
}
});
ImageBase64.java:
import java.io.ByteArrayOutputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;
import android.util.Log;
public static String encodeTobase64(Bitmap image) {
ByteArrayOutputStream baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();
String temp=null;
try{
System.gc();
temp=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
temp=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
return temp;
}
public static Bitmap decodeBase64(String input,Context context) {
byte[] decodedByte = Base64.decode(input, 0);
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"myFile");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(context.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".jpg";// also tried .txt as file extension
File image = new File(sdCardDirectory, nw);
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
outStream.write(input.getBytes());
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Compress bitmap path", image.getPath());
return decodeFile(image); // BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}
private static Bitmap decodeFile(File f){
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=70;
//Find the correct scale value. It should be the power of 2.
int scale=1;
while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)
scale*=2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
错误堆栈：
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:510)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:533)
at com.utility.ImageBase64.decodeBase64(ImageBase64.java:32)
at com.activity.HomeFragment.onCreateView(HomeFragment.java:138)
at android.app.Fragment.performCreateView(Fragment.java:1700)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.BackStackRecord.popFromBackStack(BackStackRecord.java:773)
at android.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1498)
at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:495)
at android.app.Activity.onBackPressed(Activity.java:2232)
at com.activity.MainActivity.onBackPressed(MainActivity.java:534)
at android.app.Activity.onKeyUp(Activity.java:2210)
at android.view.KeyEvent.dispatch(KeyEvent.java:2664)
at android.app.Activity.dispatchKeyEvent(Activity.java:2440)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1962)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:3884)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3858)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3552)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3453)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3609)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3445)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3453)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3585)
at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3750)
at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2027)
at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1721)
at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1712)
at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2004)
at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:138)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:5050)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:806)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
at dalvik.system.NativeStart.main(Native Method)
在某些设备中我也遇到了此错误：
java.lang.OutOfMemoryError: Failed to allocate a 38340876 byte allocation with 994361 free bytes and 971KB until OOM
at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:655)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:678)
at com.myapp.utility.ImageBase64.decodeBase64(ImageBase64.java:53)
at com.myapp.activity.DetailProfileFragment.onCreateView(DetailProfileFragment.java:103)
at android.app.Fragment.performCreateView(Fragment.java:2114)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:904)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.app.BackStackRecord.run(BackStackRecord.java:833)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5944)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1389)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1184)
我已经尝试过的解决方案是：
问题答案：
从文件中显示Bitmap时ImageView，首先借助它进行解码BitmapHelper.decodeFile(picturePath, 200, 200, true)将返回压缩状态，Bitmap以便在对该位图进行编码时，您可以处理高分辨率图像以及高达100 MB文件的大尺寸图像。
解码文件后，将其设置为，ImageView并Base64使用BitmapHelperclass
在压缩图像上方获取String形式；让Bitmap您ImageView（即已经被压缩），并使用ImageBase64.encodeTobase64(bitmap)这将再次压缩文件，并处理OutOfMemory异常，而Encoding一个Bitmap。
对于decoding第一次写你Base64String在你的设备内存中的文件。然后Bytes分块读取并解码，ByteArray以此将您的位图保存在内存中。这种规模下此位后使用decodeFile()的方法，那么你将有压缩Bitmap从Base64String
我搜索了各种博客并发表了文章，并从中选出了最合适的代码，并将它们组合成一个更加可靠的代码。尝试使用以下代码来制作代码，encoding并decoding通过内存管理更快地进行代码管理。
解码 Base64String
Bitmap bitmap = ImageBase64.decodeBase64(base64ImageStr,MainActivity.this);
imageView.setImageBitmap(bitmap);
bitmap = null;
System.gc();
编码Bitmap请尝试以下操作：
imageView.setImageBitmap(BitmapHelper.decodeFile(picturePath, 200, 200, true));
Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
base64ImageStr = ImageBase64.encodeTobase64(bitmap);
试试这个代码 ImageBase64
public class ImageBase64 {
private ImageBase64() {
super();
}
private static Context appContext;
public static String encodeTobase64(Bitmap image) {
ByteArrayOutputStream baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();
String temp=null;
try{
System.gc();
temp=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
temp=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
return temp;
}
public static Bitmap decodeBase64(String input,Context context) {
byte[] decodedByte = Base64.decode(input, 0);
appContext = context;
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(context.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".txt";
File image = new File(sdCardDirectory, nw);
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
outStream.write(input.getBytes());
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Compress bitmap path", image.getPath());
Bitmap bitmap;
try{
bitmap = BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}catch(OutOfMemoryError e){
e.printStackTrace();
InputStream is = context.getResources().openRawResource(R.drawable.default_profile_pic);
bitmap = BitmapFactory.decodeStream(is);
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
bitmap=null;
}
return bitmap;//BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
//return decodeFile(image);
}
private static Bitmap decodeFile(File f){
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=70;
//Find the correct scale value. It should be the power of 2.
int scale=1;
while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)
scale*=2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".png";
File image = new File(sdCardDirectory, nw);
FileOutputStream out = null;
try {
out = new FileOutputStream(image);
bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
// PNG is a lossless format, the compression factor (100) is ignored
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
String pathNew =compressImage(image.getAbsolutePath());
Uri uri = Uri.parse(pathNew);
Bitmap bitmap=null ;
try {
bitmap = MediaStore.Images.Media.getBitmap(appContext.getContentResolver(),uri);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bitmap;
} catch (FileNotFoundException e) {}
return null;
}
public static String compressImage(String imageUri) {
String filePath = imageUri;//getRealPathFromURI(imageUri);
Bitmap scaledBitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
// by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If
// you try the use the bitmap here, you will get null.
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
// max Height and width values of the compressed image is taken as 816x612
float maxHeight = 816.0f;
float maxWidth = 612.0f;
float imgRatio = actualWidth / actualHeight;
float maxRatio = maxWidth / maxHeight;
// width and height values are set maintaining the aspect ratio of the image
if (actualHeight > maxHeight || actualWidth > maxWidth) {
if (imgRatio < maxRatio) { imgRatio = maxHeight / actualHeight; actualWidth = (int) (imgRatio * actualWidth); actualHeight = (int) maxHeight; } else if (imgRatio > maxRatio) {
imgRatio = maxWidth / actualWidth;
actualHeight = (int) (imgRatio * actualHeight);
actualWidth = (int) maxWidth;
} else {
actualHeight = (int) maxHeight;
actualWidth = (int) maxWidth;
}
}
// setting inSampleSize value allows to load a scaled down version of the original image
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
// inJustDecodeBounds set to false to load the actual bitmap
options.inJustDecodeBounds = false;
// this options allow android to claim the bitmap memory if it runs low on memory
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try {
// load the bitmap from its path
bmp = BitmapFactory.decodeFile(filePath, options);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight,Bitmap.Config.ARGB_8888);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
float middleX = actualWidth / 2.0f;
float middleY = actualHeight / 2.0f;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
// check the rotation of the image and display it properly
ExifInterface exif;
try {
exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION, 0);
Log.d("EXIF", "Exif: " + orientation);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 3) {
matrix.postRotate(180);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 8) {
matrix.postRotate(270);
Log.d("EXIF", "Exif: " + orientation);
}
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix,
true);
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream out = null;
String filename = getFilename();
try {
out = new FileOutputStream(filename);
// write the compressed bitmap at the destination specified by filename.
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return filename;
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int heightRatio = Math.round((float) height/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; } final float totalPixels = width * height; final float totalReqPixelsCap = reqWidth * reqHeight * 2; while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
inSampleSize++;
}
return inSampleSize;
}
public static String getFilename() {
/*File file = new File(Environment.getExternalStorageDirectory().getPath(), "IMG/Images");
if (!file.exists()) {
file.mkdirs();
}
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");
*/
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath(),
"IMG/Images");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "img_" + timeStamp + randomNum+".jpg";
File image = new File(sdCardDirectory, nw);
String uriSting1 = (sdCardDirectory.getAbsolutePath() + "/" + nw);//System.currentTimeMillis() + ".jpg");
return uriSting1;
}
}
添加此类以处理沉重的图像
public class BitmapHelper
{
//decodes image and scales it to reduce memory consumption
public static Bitmap decodeFile(String bitmapFile, int requiredWidth, int requiredHeight, boolean quickAndDirty)
{
try
{
//Decode image size
BitmapFactory.Options bitmapSizeOptions = new BitmapFactory.Options();
bitmapSizeOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapSizeOptions);
// load image using inSampleSize adapted to required image size
BitmapFactory.Options bitmapDecodeOptions = new BitmapFactory.Options();
bitmapDecodeOptions.inTempStorage = new byte[16 * 1024];
bitmapDecodeOptions.inSampleSize = computeInSampleSize(bitmapSizeOptions, requiredWidth, requiredHeight, false);
bitmapDecodeOptions.inPurgeable = true;
bitmapDecodeOptions.inDither = !quickAndDirty;
bitmapDecodeOptions.inPreferredConfig = quickAndDirty ? Bitmap.Config.RGB_565 : Bitmap.Config.ARGB_8888;
Bitmap decodedBitmap = BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapDecodeOptions);
// scale bitmap to mathc required size (and keep aspect ratio)
float srcWidth = (float) bitmapDecodeOptions.outWidth;
float srcHeight = (float) bitmapDecodeOptions.outHeight;
float dstWidth = (float) requiredWidth;
float dstHeight = (float) requiredHeight;
float srcAspectRatio = srcWidth / srcHeight;
float dstAspectRatio = dstWidth / dstHeight;
// recycleDecodedBitmap is used to know if we must recycle intermediary 'decodedBitmap'
// (DO NOT recycle it right away: wait for end of bitmap manipulation process to avoid
// java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@416ee7d8
// I do not excatly understand why, but this way it's OK
boolean recycleDecodedBitmap = false;
Bitmap scaledBitmap = decodedBitmap;
if (srcAspectRatio < dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) dstWidth, (int) (srcHeight * (dstWidth / srcWidth)));
// will recycle recycleDecodedBitmap
recycleDecodedBitmap = true;
}
else if (srcAspectRatio > dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) (srcWidth * (dstHeight / srcHeight)), (int) dstHeight);
recycleDecodedBitmap = true;
}
// crop image to match required image size
int scaledBitmapWidth = scaledBitmap.getWidth();
int scaledBitmapHeight = scaledBitmap.getHeight();
Bitmap croppedBitmap = scaledBitmap;
if (scaledBitmapWidth > requiredWidth)
{
int xOffset = (scaledBitmapWidth - requiredWidth) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, xOffset, 0, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
else if (scaledBitmapHeight > requiredHeight)
{
int yOffset = (scaledBitmapHeight - requiredHeight) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, 0, yOffset, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
if (recycleDecodedBitmap)
{
decodedBitmap.recycle();
}
decodedBitmap = null;
scaledBitmap = null;
return croppedBitmap;
}
catch (Exception ex)
{
ex.printStackTrace();
}
return null;
}
/**
* compute powerOf2 or exact scale to be used as {@link BitmapFactory.Options#inSampleSize} value (for subSampling)
*
* @param requiredWidth
* @param requiredHeight
* @param powerOf2
* weither we want a power of 2 sclae or not
* @return
*/
public static int computeInSampleSize(BitmapFactory.Options options, int dstWidth, int dstHeight, boolean powerOf2)
{
int inSampleSize = 1;
// Raw height and width of image
final int srcHeight = options.outHeight;
final int srcWidth = options.outWidth;
if (powerOf2)
{
//Find the correct scale value. It should be the power of 2.
int tmpWidth = srcWidth, tmpHeight = srcHeight;
while (true)
{
if (tmpWidth / 2 < dstWidth || tmpHeight / 2 < dstHeight)
break;
tmpWidth /= 2;
tmpHeight /= 2;
inSampleSize *= 2;
}
}
else
{
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) srcHeight / (float) dstHeight);
final int widthRatio = Math.round((float) srcWidth / (float) dstWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
public static Bitmap drawableToBitmap(Drawable drawable)
{
if (drawable instanceof BitmapDrawable)
{
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
public static Bitmap getScaledBitmap(Bitmap bitmap, int newWidth, int newHeight)
{
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
}
