Android-在“活动”中将位图保存到SD卡以获取结果之前压缩位图
我一直在绞尽脑汁,不知道该怎么办。我想做的是:拍摄一张照片,将其压缩为png(保留原始尺寸),然后将其保存到SD卡。我之所以需要这样做,是因为我必须再次对其进行重新压缩,然后对其进行Base64编码,以便将其发送到服务器。问题是1。文件太大了。我的内存和内存都快用完了。不确定我是否做得正确 谢谢你的帮助 这是我的密码:Android-在“活动”中将位图保存到SD卡以获取结果之前压缩位图,android,memory,bitmap,compression,android-camera,Android,Memory,Bitmap,Compression,Android Camera,我一直在绞尽脑汁,不知道该怎么办。我想做的是:拍摄一张照片,将其压缩为png(保留原始尺寸),然后将其保存到SD卡。我之所以需要这样做,是因为我必须再次对其进行重新压缩,然后对其进行Base64编码,以便将其发送到服务器。问题是1。文件太大了。我的内存和内存都快用完了。不确定我是否做得正确 谢谢你的帮助 这是我的密码: @Override public void onClick(View button) { switch (button.getId()) { case R
@Override
public void onClick(View button) {
switch (button.getId()) {
case R.id.cameraButton:
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT,
Uri.fromFile(new File("/sdcard/test.png")));
startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
break;
case R.id.galleryButton:
sendToDatabase();
break;
}
}
// Camera on activity for result - save it as a bmp and place in imageview
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_PIC_REQUEST) {
// do something
}
if (resultCode == Activity.RESULT_OK) {
Log.d(TAG, "result ok");
picture = BitmapFactory.decodeFile("/sdcard/test.png");
// Create string to place it in sd card
String extStorageDirectory = Environment
.getExternalStorageDirectory().toString();
//create output stream
OutputStream outputStream = null;
//create file
File file = new File(extStorageDirectory, "test.png");
try {
outputStream = new FileOutputStream(file);
picture.compress(Bitmap.CompressFormat.PNG, 80, outputStream);
//picture.recycle();
outputStream.flush();
outputStream.close();
} catch (IOException e){
Log.d(TAG, "ERROR");
}
imageView.setImageBitmap(picture);
}
}
public void sendToDatabase() {
InputStream inputStream = null;
//get the picture from location
picture = BitmapFactory.decodeFile("/sdcard/test.png");
// CONVERT:
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
Boolean didItWork = picture.compress(Bitmap.CompressFormat.PNG, 50, outStream);
picture.recycle();
if (didItWork = true) {
Log.d(TAG, "compression worked");
}
Log.d(TAG, "AFTER. Height: " + picture.getHeight() + " Width: "
+ picture.getWidth());
final byte[] ba = outStream.toByteArray();
try {
outStream.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
执行picture.compress(Bitmap.CompressFormat.PNG,50,扩展)时;压缩不会像无损PNG那样工作,将忽略质量设置。所以参数50在这种情况下不起作用。因此,我建议您将CompressFormat.PNG更改为CompressFormat.JPEG。请记住Bitmap.compress(..)质量设置对PNG压缩没有影响。如果您想减少文件大小,您可以选择有损JPG或降低图像大小。谢谢。最后我把它压缩成JPEG格式。