从智能手机点击照片时，图像尺寸太大，上传时间很短，所以我希望减小图像尺寸而不会影响其质量。所以我从这个网站link获得了代码。但是在我现有代码中添加代码时，会出现一些修复的编译器错误。
以下错误属于compressImage(String imageUri)函数
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
错误是：cannot resolve mrthod 'setScale(float,float,float)'
canvas.setMatrix(scaleMatrix);
错误是：setMatrix (android.graphics.Matrix) in Canvas cannot be applied to (android.opengl.Matrix)
matrix.postRotate(90);
matrix.postRotate(180);
matrix.postRotate(270);
错误是：cannot resolve method 'postRotate(int)'
代码：
public class Camera extends AppCompatActivity implements View.OnClickListener {
public static final String UPLOAD_URL = "http://website.com/ImageUpload/upload.php";
public static final String UPLOAD_KEY = "image";
public static final String UPLOAD_NAME = "name";
public static final String UPLOAD_EMAIL = "email";
public static final String UPLOAD_PHONE= "phone";
public static final String TAG = "MY MESSAGE";
boolean b=false,z;
private int PICK_IMAGE_REQUEST = 1;
String mock;
private Button buttonChoose;
String uploadImage;
private Button buttonUpload,buttonView;
private ImageView imageView;
private Bitmap bitmap,bitmaps;
private Uri filePath;
String path;
String[] max;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera);
buttonChoose = (Button) findViewById(R.id.buttonChoose);
buttonUpload = (Button) findViewById(R.id.buttonUpload);
buttonView = (Button) findViewById(R.id.buttonViewImage);
buttonUpload.setEnabled(false);
imageView = (ImageView) findViewById(R.id.imageView);
buttonChoose.setOnClickListener(this);
buttonUpload.setOnClickListener(this);
buttonView.setOnClickListener(this);
/* GetSet b= new GetSet();
String maths=b.getCombine();
*/
// System.out.println("Matru "+maths);
Bundle bundle = getIntent().getExtras();
//Extract the data…
String stuff = bundle.getString("combine_data");
// String sss = bundle.getString("combine_data2");
System.out.println("changa " + stuff);
max=stuff.split("~");
for(int i=0;i<max.length;i++)
System.out.println("binku " + max[i]);
}
private void selectImage() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(intent, 1);
}
private void showFileChooser() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(b) {
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
filePath = data.getData();
try {
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
imageView.setImageBitmap(bitmap);
buttonUpload.setEnabled(true);
} catch (IOException e) {
e.printStackTrace();
}
}
}
else {
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
File f = new File(Environment.getExternalStorageDirectory().toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("temp.jpg")) {
f = temp;
break;
}
}
try {
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmaps = BitmapFactory.decodeFile(f.getAbsolutePath(),
bitmapOptions);
imageView.setImageBitmap(bitmaps);
buttonUpload.setEnabled(true);
mock= getStringImage(bitmaps);
String path = android.os.Environment
.getExternalStorageDirectory()
+ File.separator
+ "Phoenix" + File.separator + "default";
f.delete();
OutputStream outFile = null;
File file = new File(path, String.valueOf(System.currentTimeMillis()) + ".jpg");
try {
outFile = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, outFile);
outFile.flush();
outFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
public String getStringImage(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
private void uploadImage(){
class UploadImage extends AsyncTask<Bitmap,Void,String>{
ProgressDialog loading;
RequestHandler rh = new RequestHandler();
@Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(Camera.this, "Uploading Image", "Please wait...",true,true);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
imageView.setImageDrawable(null);
buttonUpload.setEnabled(false);
}
@Override
protected String doInBackground(Bitmap... params) {
Bitmap bitmap = params[0];
if(z)
uploadImage = getStringImage(bitmap);
else
uploadImage = mock;
String compress_image=compressImage(uploadImage);
HashMap<String,String> data = new HashMap<>();
data.put(UPLOAD_KEY, compress_image);
data.put(UPLOAD_NAME,max[0]);
data.put(UPLOAD_EMAIL,max[2]);
data.put(UPLOAD_PHONE,max[1]);
String result = rh.sendPostRequest(UPLOAD_URL,data);
return result;
}
}
UploadImage ui = new UploadImage();
ui.execute(bitmap);
}
public String compressImage(String imageUri) {
path = 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(path, 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(path, 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(path);
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
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;
}
private String getRealPathFromURI(String contentURI) {
Uri contentUri = Uri.parse(contentURI);
Cursor cursor = getContentResolver().query(contentUri, null, null, null, null);
if (cursor == null) {
return contentUri.getPath();
} else {
cursor.moveToFirst();
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
return cursor.getString(index);
}
}
public 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 String getFilename() {
File file = new File(Environment.getExternalStorageDirectory().getPath(), "MyFolder/Images");
if (!file.exists()) {
file.mkdirs();
}
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");
return uriSting;
}
@Override
public void onClick(View v) {
if (v == buttonChoose) {
b=true;
z=true;
showFileChooser();
}
if(v == buttonUpload) {
uploadImage();
}
if(v == buttonView){
b=false;
z=false;
selectImage();
}
}
}
答案 0 :(得分：0)
我认为如果你减少位图大小，那么你可以解决这个问题 -
public static Bitmap getBitmapFromByteArray(final byte data[], int maxSize) {
final int MAX_SIZE = maxSize;
if (data.length > 0) {
try {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
data.length, options);
final int fullWidth = options.outWidth;
final int fullHeight = options.outHeight;
int w = 0;
int h = 0;
if (fullWidth > fullHeight) {
w = MAX_SIZE;
h = w * fullHeight / fullWidth;
} else {
h = MAX_SIZE;
w = h * fullWidth / fullHeight;
}
options.inJustDecodeBounds = false;
options.inSampleSize = fullWidth / w;
bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,
options);
return bitmap;
} catch (final Exception e) {
}
}
return null;
}
您将从此位图发送当前位图ByteArray数据的大小。然后它将通过调整大小返回位图。你可以试试这个。
答案 1 :(得分：0)
可以通过两种方式完成，即降低jpeg的质量或调整图像大小。
调整图片大小
Bitmap mBitmap = Bitmap.createScaledBitmap(bitmap, 480, 300, true);
降低jpeg的质量
bitmap.compress(Bitmap.CompressFormat.JPEG, 60, outFile);