我需要将从我的相册和相机拍摄的照片裁剪为600x600像素。我怎么能做到这一点？
代码：
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.NavUtils;
import android.text.LoginFilter.UsernameFilterGeneric;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnFocusChangeListener;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class RegisterActivity extends Activity {
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
private static final int REQUEST_CAMERA = 1;
private static final int REQUEST_SELECT_FILE = 2;
private static final int REQUEST_PIC_CROP = 100;
private static final String TAG = "RegisterActivity";
private ImageView ivAddPhoto;
private TextView tvAddPhoto;
private EditText etUserName, etPassword, etEmail, etConfirmPassword;
private Button btnSubscriptionButton, btnAddPhoto, mPolicyButton;
private ImageView mUserNameStatusView, mEmailStatusView;
public ProgressBar pbUserName, pbEmail;
public ProgressDialog pd;
private WebView webView;
private static Uri mFileUri;
private BackgroundTaskRegister mBackgroundTask = null;
private String mLogin;
private String mPassword;
private String mEmail;
private File mPic;
private String mConfirmPassword;
//private List<String> mFacebookData = new ArrayList<String>();
private String mFacebookData = "";
private String selectedImagePath = "";
private boolean mGallaryPhotoSelected = false;
private Context mContext;
private File file;
public boolean cancel = false;
public View focusView = null;
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.register, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
// Handle action bar actions click
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
case R.id.action_reset:
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
mContext = RegisterActivity.this;
getActionBar().setDisplayHomeAsUpEnabled(true);
etUserName = (EditText) findViewById(R.id.etUserName);
etEmail = (EditText) findViewById(R.id.etEmail);
etPassword = (EditText) findViewById(R.id.etPassword);
etConfirmPassword = (EditText) findViewById(R.id.etConfirmPassword);
pbUserName = (ProgressBar) findViewById(R.id.pbUserName);
pbUserName.setVisibility(View.INVISIBLE);
pbEmail = (ProgressBar) findViewById(R.id.pbEmail);
pbEmail.setVisibility(View.INVISIBLE);
mPolicyButton = (Button) findViewById(R.id.btnPolicy);
ivAddPhoto = (ImageView) findViewById(R.id.ivAddPhoto);
tvAddPhoto = (TextView) findViewById(R.id.tvAddPhoto);
btnAddPhoto = (Button) findViewById(R.id.btnAddPhoto);
mUserNameStatusView = (ImageView) findViewById(R.id.ivUserNameStatus);
mUserNameStatusView.setVisibility(View.INVISIBLE);
mEmailStatusView = (ImageView) findViewById(R.id.ivEmailStatus);
mEmailStatusView.setVisibility(View.INVISIBLE);
btnAddPhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// start the image capture Intent
selectImage();
}
});
if (savedInstanceState != null) {
Log.i(TAG, "im in a savedInstanceState");
mFileUri = savedInstanceState.getParcelable("fileUri");
}
btnSubscriptionButton = (Button) findViewById(R.id.btnSubscriptionButton);
btnSubscriptionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mLogin = etUserName.getText().toString();
mPassword = md5(md5(etPassword.getText().toString()));
mEmail = etEmail.getText().toString();
if (mLogin != null || mPassword != null || mEmail != null){
mPic = new File(selectedImagePath);
attemptRegistration();
}
}
});
etUserName.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
mUserNameStatusView.setVisibility(View.INVISIBLE);
if(!etUserName.hasFocus()) {
mLogin = etUserName.getText().toString();
// Check for a valid userName.
if (TextUtils.isEmpty(mLogin)) {
etUserName.setError(getString(R.string.error_field_required));
focusView = etUserName;
cancel = true;
} else if (mLogin.length() > 30) {
etUserName.setError(getString(R.string.error_invalid_username));
focusView = etUserName;
cancel = true;
} else if (!checkCharacters(mLogin)){
etUserName.setError(getString(R.string.error_character_not_allowed));
focusView = etUserName;
cancel = true;
} else {
cancel = false;
etUserName.setError(null);
pbUserName.setVisibility(View.VISIBLE);
checkValidityOfString(2);
}
}
}
});
mPolicyButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//metti il link della pagina che ti serve per la policy
Uri uri = Uri.parse("http://www.google.com");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
});
etEmail.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
mEmailStatusView.setVisibility(View.INVISIBLE);
if(!etEmail.hasFocus()) {
mEmail = etEmail.getText().toString();
// Check for a valid email address.
if (TextUtils.isEmpty(mEmail)) {
etEmail.setError(getString(R.string.error_field_required));
focusView = etEmail;
cancel = true;
} else if (!mEmail.contains("@")) {
etEmail.setError(getString(R.string.error_invalid_email));
focusView = etEmail;
cancel = true;
} else if (!checkCharacters(mEmail)){
etEmail.setError(getString(R.string.error_character_not_allowed));
focusView = etEmail;
cancel = true;
} else {
cancel = false;
etEmail.setError(null);
pbEmail.setVisibility(View.VISIBLE);
checkValidityOfString(3);
}
}
}
});
}
private void selectImage() {
final CharSequence[] items = { "Usa Camera", "Prendi da Galleria", "Chiudi" };
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Aggiungi Foto!");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Usa Camera")) {
// call android default camera
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
mFileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mFileUri);
Log.i(TAG, "Usa Camera - mFileUri" + mFileUri.toString());
try {
startActivityForResult(takePictureIntent, REQUEST_CAMERA);
} catch (ActivityNotFoundException e) {
// Do nothing for now
Log.e(TAG, "ActivityNotFoundException");
}
} else if (items[item].equals("Prendi da Galleria")) {
Intent intent = new Intent();
// call android default gallery
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
try {
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Complete action using"), REQUEST_SELECT_FILE);
} catch (ActivityNotFoundException e) {
// Do nothing for now
Log.e(TAG, "ActivityNotFoundException");
}
} else if (items[item].equals("Chiudi")) {
dialog.dismiss();
}
}
});
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_CAMERA:
Log.i("mFileUri: ", mFileUri.getPath().toString());
performCrop(mFileUri, mContext);
//File file1 = new File(mFileUri.getPath());
//Bitmap mBitmap = CameraHelper.decodeFile(file1);
//ivAddPhoto.setImageBitmap(mBitmap);
break;
case REQUEST_SELECT_FILE:
if (data != null){
mFileUri = data.getData();
Log.i("mFileUri: ", mFileUri.getPath().toString());
performCrop(mFileUri, mContext);
mGallaryPhotoSelected = true;
tvAddPhoto.setText("Cambia");
}
break;
case REQUEST_PIC_CROP:
Bundle extras = data.getExtras();
selectedImagePath = mFileUri.getPath();
if (mGallaryPhotoSelected) {
selectedImagePath = getRealPathFromURI(mFileUri);
Log.i("TAG", "Absolute Path " + selectedImagePath);
mGallaryPhotoSelected = true;
}
if (extras != null) {
Log.i("TAG", "Inside Extra " + selectedImagePath);
Bitmap photo = (Bitmap) extras.get("data");
selectedImagePath = String.valueOf(System.currentTimeMillis()) + ".jpg";
file = new File(Environment.getExternalStorageDirectory(), selectedImagePath);
try {
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
photo.compress(Bitmap.CompressFormat.JPEG, 100, fos);
} catch (IOException e) {
// TODO Auto-generated catch block
Toast.makeText(this,"Sorry, Camera Crashed-Please Report as Crash A.", Toast.LENGTH_LONG).show();
}
selectedImagePath = Environment.getExternalStorageDirectory() + "/" + selectedImagePath;
Log.i("TAG", "After File Created " + selectedImagePath);
Bitmap bm;
//bm = CameraHelper.decodeFile(file);
bm = CameraHelper.decodeSampledBitmapFromUri(selectedImagePath, 150, 150);
ivAddPhoto.setImageBitmap(bm);
}
break;
}
}
private String getRealPathFromURI(Uri contentURI) {
String result;
Cursor cursor = getContentResolver().query(contentURI, null, null, null, null);
if (cursor == null) { // Source is Dropbox or other similar local file path
result = contentURI.getPath();
} else {
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
result = cursor.getString(idx);
cursor.close();
}
return result;
}
private void performCrop(Uri picUri, Context context) {
try {
Log.i("crop", "performing crop");
Intent cropIntent = new Intent("com.android.camera.action.CROP");
// indicate image type and Uri
cropIntent.setDataAndType(picUri, "image/*");
// set crop properties
cropIntent.putExtra("crop", "true");
// indicate aspect of desired crop
cropIntent.putExtra("aspectX", 1);
cropIntent.putExtra("aspectY", 1);
// indicate output X and Y
//cropIntent.putExtra("outputX", 95);
//cropIntent.putExtra("outputY", 95);
// retrieve data on return
cropIntent.putExtra("return-data", true);
// start the activity - we handle returning in onActivityResult
startActivityForResult(cropIntent, REQUEST_PIC_CROP);
}
// respond to users whose devices do not support the crop action
catch (ActivityNotFoundException anfe) {
// display an error message
String errorMessage = "Whoops - your device doesn't support the crop action!";
Toast toast = Toast.makeText(context, errorMessage, Toast.LENGTH_SHORT);
toast.show();
}
}
/**
* Here we store the file url as it will be null after returning from camera
* app
*/
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// save file url in bundle as it will be null on scren orientation changes
outState.putParcelable("file_uri", mFileUri);
}
/*
* Here we restore the fileUri again
*/
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// get the file url
mFileUri = savedInstanceState.getParcelable("file_uri");
}
// Create a file Uri for saving an image or video
private static Uri getOutputMediaFileUri(int type) {
return Uri.fromFile(CameraHelper.getOutputMediaFile(type));
}
/**
* Attempts to sign in or register the account specified by the login form.
* If there are form errors (invalid email, missing fields, etc.), the
* errors are presented and no actual login attempt is made.
*/
public void attemptRegistration() {
if (mBackgroundTask != null) {
return;
}
// Reset errors.
etPassword.setError(null);
etConfirmPassword.setError(null);
// Store values at the time of the login attempt.
mPassword = etPassword.getText().toString();
mConfirmPassword = etConfirmPassword.getText().toString();
// Check for a valid password.
if (TextUtils.isEmpty(mPassword)) {
etPassword.setError(getString(R.string.error_field_required));
focusView = etPassword;
cancel = true;
} else if (mPassword.length() < 6 || mPassword.length() > 30) {
etPassword.setError(getString(R.string.error_invalid_password));
focusView = etPassword;
cancel = true;
} else if (!checkCharacters(mPassword)){
etPassword.setError(getString(R.string.error_character_not_allowed));
focusView = etPassword;
cancel = true;
}
// Check for a valid confirmPassword.
if (TextUtils.isEmpty(mConfirmPassword)) {
etConfirmPassword.setError(getString(R.string.error_field_required));
focusView = etConfirmPassword;
cancel = true;
} else if (!mConfirmPassword.equals(mPassword)) {
etConfirmPassword.setError(getString(R.string.error_invalid_confirmed_password));
focusView = etConfirmPassword;
cancel = true;
}
if (cancel) {
// There was an error; don't attempt login and focus the first
// form field with an error.
focusView.requestFocus();
} else {
// Show a progress spinner, and kick off a background task to
// perform the user login attempt.
pd = new ProgressDialog(mContext);
pd.setMessage("Registrazione in corso...");
pd.show();
mBackgroundTask = new BackgroundTaskRegister();
//mBackgroundTask.execute((Void) null);
mBackgroundTask.execute(1);
}
}
private boolean checkCharacters(String s){
UsernameFilterGeneric usernameFilterGeneric = new UsernameFilterGeneric();
for (char ch : s.toCharArray()) {
if (!usernameFilterGeneric.isAllowed(ch)){
//Log.i(TAG, "this characters is not allowed: " + Character.toString(ch));
return false;
}
}
return true;
}
//metodo che lancia la chiamata background per
//la verifica se esistono già il login e email
private void checkValidityOfString(int i) {
mBackgroundTask = new BackgroundTaskRegister();
mBackgroundTask.execute(i);
}
//md5 for crypting and hash
private static String md5(String data) {
byte[] bdata = new byte[data.length()];
int i;
byte[] hash;
for (i = 0; i < data.length(); i++)
bdata[i] = (byte) (data.charAt(i) & 0xff);
try {
MessageDigest md5er = MessageDigest.getInstance("MD5");
hash = md5er.digest(bdata);
} catch (GeneralSecurityException e) {
throw new RuntimeException(e);
}
StringBuffer r = new StringBuffer(32);
for (i = 0; i < hash.length; i++) {
String x = Integer.toHexString(hash[i] & 0xff);
if (x.length() < 2)
r.append("0");
r.append(x);
}
return r.toString();
}
/**
* Represents an asynchronous task used to upload
* information to the webserver and display the results
*/
public class BackgroundTaskRegister extends AsyncTask<Integer, Void, Integer> {
public int mOption;
@Override
protected Integer doInBackground(Integer... params) {
// TODO: attempt authentication against a network service.
Log.i(TAG, "Operation is: " + Integer.toString(params[0]));
int responseStatus = 0;
switch (params[0]) {
case 1: responseStatus = MVPFunctions.getInstance().register(mLogin, mPassword, mEmail, mPic, "", mFacebookData);
mOption = 1;
break;
case 2: responseStatus = MVPFunctions.getInstance().checklogin(mLogin);
mOption = 2;
break;
case 3: responseStatus = MVPFunctions.getInstance().checkemail(mEmail);
mOption = 3;
break;
}
return responseStatus;
}
@Override
protected void onPreExecute(){
/*
* This is executed on UI thread before doInBackground(). It is
* the perfect place to show the progress dialog.
*/
}
@Override
protected void onPostExecute(Integer result) {
mBackgroundTask = null;
switch (mOption) {
case 1: if (result == 0) {
pd.cancel();
Toast.makeText(mContext, "Registrazione andata a buon fine!", Toast.LENGTH_SHORT).show();
lovertechSession.createLoginSession(mLogin, mPassword);
Intent intent = new Intent(getApplicationContext(), WallActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
finish();
startActivity(intent);
} else {
Toast.makeText(mContext, "username o password errati!", Toast.LENGTH_SHORT).show();
}
break;
case 2: pbUserName.setVisibility(View.INVISIBLE);
if (result == 0) {
mUserNameStatusView.setVisibility(View.VISIBLE);
} else if (result == 101) {
mUserNameStatusView.setVisibility(View.INVISIBLE);
etUserName.setError(getString(R.string.error_username_not_available));
focusView = etUserName;
cancel = true;
}
break;
case 3: pbEmail.setVisibility(View.INVISIBLE);
if (result == 0) {
mEmailStatusView.setVisibility(View.VISIBLE);
} else if (result == 117) {
mEmailStatusView.setVisibility(View.INVISIBLE);
etEmail.setError(getString(R.string.error_email_already_used));
focusView = etEmail;
cancel = true;
} else if (result == 129) {
mEmailStatusView.setVisibility(View.INVISIBLE);
etEmail.setError(getString(R.string.error_email_uncorrect_format));
focusView = etEmail;
cancel = true;
}
break;
}
}
}
}
答案 0 :(得分：1)
这是代码，
public static Bitmap decodeFile(File f, int sampling) {
try {
// Decode image size
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inJustDecodeBounds = true;
BitmapFactory.decodeStream(
new FileInputStream(f.getAbsolutePath()), null, o2);
o2.inSampleSize = sampling;
o2.inTempStorage = new byte[48 * 1024];
// Decode bitmap with inSampleSize set
o2.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeStream(
new FileInputStream(f.getAbsolutePath()), null, o2);
final int THUMBNAIL_SIZE = 600;
bitmap = Bitmap.createScaledBitmap(bitmap, THUMBNAIL_SIZE,
THUMBNAIL_SIZE, false);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
bitmap = rotateImage(bitmap, f.getAbsolutePath());
return bitmap;
} catch (FileNotFoundException e) {
} catch (OutOfMemoryError e) {
e.printStackTrace();
}
return null;
}
public static Bitmap rotateImage(Bitmap bmp, String imageUrl) {
if (bmp != null) {
ExifInterface ei;
int orientation = 0;
try {
ei = new ExifInterface(imageUrl);
orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
Log.v("test", "ORIENTATION : " + orientation);
} catch (IOException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
}
int bmpWidth = bmp.getWidth();
int bmpHeight = bmp.getHeight();
Matrix matrix = new Matrix();
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
matrix.postRotate(90);
break;
case ExifInterface.ORIENTATION_ROTATE_180:
matrix.postRotate(180);
break;
case ExifInterface.ORIENTATION_ROTATE_270:
matrix.postRotate(270);
break;
default:
break;
// etc.
}
Bitmap resizedBitmap = Bitmap.createBitmap(bmp, 0, 0, bmpWidth,
bmpHeight, matrix, true);
return resizedBitmap;
} else {
return bmp;
}
}
答案 1 :(得分：1)
由于我找不到让用户选择裁剪的方法，我决定使用本教程自动裁剪图片：http://developer.sonymobile.com/2011/06/27/how-to-scale-images-for-your-android-application/
答案 2 :(得分：0)
使用以下代码
您也可以使用此链接作为参考
int targetWidth = 600;
int targetHeight = 600;
Bitmap targetBitmap = Bitmap.createBitmap(
targetWidth, targetHeight,Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(targetBitmap);
Path path = new Path();
path.addRect(rectf, Path.Direction.CW);
canvas.clipPath(path);
canvas.drawBitmap( sourceBitmap,
new Rect(0, 0, sourceBitmap.getWidth(), sourceBitmap.getHeight()),
new Rect(0, 0, targetWidth, targetHeight), null);
ImageView imageView = (ImageView)findViewById(R.id.my_image_view);
imageView.setImageBitmap(targetBitmap);
答案 3 :(得分：0)
您可以在this post
中找到有关重新调整大小的有用信息有关裁剪in this post
的更多信息