无法将ProfilePictureView强制转换为android.widget.ImageView

Question

启动以下活动时，我的应用程序意外崩溃。 基本上，在此活动中，用户可以从Facebook上传他们的图片，并将个人资料图片投射到imageview。

我在日志猫消息下面包括了以下内容：

10-17 03:59:52.525: E/AndroidRuntime(1799): FATAL EXCEPTION: main
    10-17 03:59:52.525: E/AndroidRuntime(1799): Process: com.dooba.beta, PID: 1799
    10-17 03:59:52.525: E/AndroidRuntime(1799): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dooba.beta/com.dooba.beta.ProfileCreation}: java.lang.ClassCastException: com.facebook.widget.ProfilePictureView cannot be cast to android.widget.ImageView
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.os.Handler.dispatchMessage(Handler.java:102)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.os.Looper.loop(Looper.java:136)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.ActivityThread.main(ActivityThread.java:5017)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at java.lang.reflect.Method.invokeNative(Native Method)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at java.lang.reflect.Method.invoke(Method.java:515)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at dalvik.system.NativeStart.main(Native Method)
    10-17 03:59:52.525: E/AndroidRuntime(1799): Caused by: java.lang.ClassCastException: com.facebook.widget.ProfilePictureView cannot be cast to android.widget.ImageView
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at com.dooba.beta.ProfileCreation.onCreate(ProfileCreation.java:87)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.Activity.performCreate(Activity.java:5231)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
    10-17 03:59:52.525: E/AndroidRuntime(1799):     ... 11 more

以下是活动代码：

public class ProfileCreation extends Activity {

private static final int RESULT_LOAD_IMAGE = 1;
FrameLayout layout;
Button save;

protected Number age;

private static final String TAG = "ProfileCreation";

protected Button mConfirm;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_profile_creation);

    RelativeLayout v = (RelativeLayout) findViewById(R.id.main); 

    v.requestFocus();

    Parse.initialize(this, "ID", "DLvq1OqSo87kzEw5j1XNBPKJdXF7dxwRtfEPkxWJ");

    mName = (EditText)findViewById(R.id.etxtname);
    mAge = (EditText)findViewById(R.id.etxtage);
    mHeadline = (EditText)findViewById(R.id.etxtheadline);
    mprofilePicture = (ImageView)findViewById(R.id.profilePicturePreview);
    male = (RadioButton)findViewById(R.id.rimale);
    female = (RadioButton)findViewById(R.id.rifemale);
    lmale = (RadioButton)findViewById(R.id.rlmale);
    lfemale = (RadioButton)findViewById(R.id.rlfemale);
    seekBarMinimum = (SeekBar) findViewById(R.id.sbseekBarMinimumAge);
    seekBarMaximum = (SeekBar) findViewById(R.id.sbseekBarMaximumAge);
    seekBarDistance = (SeekBar) findViewById(R.id.sbseekBarDistance);
    seekBarActivityDistance = (SeekBar) findViewById(R.id.sbseekBarActivityDistance);


    mConfirm = (Button)findViewById(R.id.btnConfirm);
    mConfirm.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String name = mName.getText().toString();
        //    Number age = mAge.getText(;
            String headline = mHeadline.getText().toString();






         // age = ((String) age).trim();
            name = name.trim();
            headline = headline.trim();

            if (name.isEmpty() || headline.isEmpty()) {
                AlertDialog.Builder builder = new AlertDialog.Builder(ProfileCreation.this);
                builder.setMessage(R.string.signup_error_message)
                    .setTitle(R.string.signup_error_title)
                    .setPositiveButton(android.R.string.ok, null);
                AlertDialog dialog = builder.create();
                dialog.show();
            }
            else {
                // create the new user!
                setProgressBarIndeterminateVisibility(true);

                ParseUser currentUser = ParseUser.getCurrentUser();





                if(male.isChecked())
                    gender = "Male";
                else
                    gender = "Female";

                if(lmale.isChecked())
                    lgender = "Male";
                else
                    lgender = "Female";
                age = Integer.parseInt(mAge.getText().toString());




                /* This is the section where the images is converted, saved, and uploaded. I have not been able Locate the image from the ImageView, where the user uploads the picture to imageview from either their gallery and later on from facebook */ 
                ImageView myImgView = (ImageView) findViewById(R.id.profilePicturePreview);



                Bitmap bitmap = ((BitmapDrawable) myImgView.getDrawable()).getBitmap();

                // Convert it to byte
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                // Compress image to lower quality scale 1 - 100
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
                byte[] image = stream.toByteArray();

                // Create the ParseFile
                ParseFile file = new ParseFile("profilePicture.png", image);
                // Upload the image into Parse Cloud
                file.saveInBackground();



                // Create a column named "Profile Picture" and set the string
                currentUser.put("ImageName", "Profile Picture");

                // Create a column named "ImageFile" and insert the image
                currentUser.put("ProfilePicture", file);




                currentUser.saveInBackground(new SaveCallback() {
                    @Override
                    public void done(ParseException e) {
                        setProgressBarIndeterminateVisibility(false);

                        if (e == null) {
                            // Success!
                            Intent intent = new Intent(ProfileCreation.this, MoodActivity.class);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                            startActivity(intent);
                        }
                        else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(ProfileCreation.this);
                            builder.setMessage(e.getMessage())
                                .setTitle(R.string.signup_error_message)
                                .setPositiveButton(android.R.string.ok, null);
                            AlertDialog dialog = builder.create();
                            dialog.show();
                        }
                    }
                });
            }
        }
    });



    SeekBar seekBar = (SeekBar) findViewById(R.id.sbseekBarDistance);
    final TextView seekBarValue = (TextView) findViewById(R.id.tvseekBarDistanceValue);

    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            // TODO Auto-generated method stub 
            seekBarValue.setText(String.valueOf(progress));
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

    }); // Add this

    Button mcancel = (Button)findViewById(R.id.btnBack);
    mcancel.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            ProfileCreation.this.startActivity(new Intent(ProfileCreation.this, LoginActivity.class));
        }
    });

    SeekBar seekBarActivity = (SeekBar) findViewById(R.id.sbseekBarActivityDistance);
    final TextView seekBarActivityValue = (TextView) findViewById(R.id.tvseekBarActivityDistanceValue);

    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            // TODO Auto-generated method stub 
            seekBarValue.setText(String.valueOf(progress));
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

    }); // Add this






    SeekBar seekBarMinimum = (SeekBar) findViewById(R.id.sbseekBarMinimumAge);
    final TextView txtMinimum = (TextView) findViewById(R.id.tvMinAge);

    seekBarMinimum.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            // TODO Auto-generated method stub 
             if (progress <= 18) {
                    seekBar.setProgress(18);
                } else {
                    txtMinimum.setText(String.valueOf(progress));
                }


        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

    }); // Add this

    SeekBar seekBarMaximum = (SeekBar) findViewById(R.id.sbseekBarMaximumAge);
    final TextView txtMaximum = (TextView) findViewById(R.id.tvMaxAge);

    seekBarMaximum.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            // TODO Auto-generated method stub 
            txtMaximum.setText(String.valueOf(progress));
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub 
        }

    }); // Add this







    Button buttonLoadImage = (Button) findViewById(R.id.btnPictureSelect);
    buttonLoadImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            Intent i = new Intent(
                    Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(i, RESULT_LOAD_IMAGE);
        }
    });


    final ProfilePictureView mprofilePictureView = (ProfilePictureView) findViewById(R.id.profilePicturePreview);
    LoginButton authButton = (LoginButton) findViewById(R.id.btnFacebookUpload); 
    authButton.setSessionStatusCallback(new Session.StatusCallback() {

                @SuppressWarnings("deprecation")
                @Override
                public void call(Session session, SessionState state,
                        Exception exception) {
        Log.i(TAG, "Access Token" + session.getAccessToken());
                        Request.executeMeRequestAsync(session,
                                new Request.GraphUserCallback() {
                                    @Override
                                    public void onCompleted(GraphUser user,
                                            Response response) {
                                        if (user != null) {
        mprofilePictureView.setProfileId(user.getId());

                                        }
                                    }
                                });

                }
    });

} 



    @Override
    protected 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]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            ImageView imageView = (ImageView) findViewById(R.id.profilePicturePreview);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

        }

    }

    private byte[] readInFile(String path) throws IOException {
        // TODO Auto-generated method stub
        byte[] data = null;
        File file = new File(path);
        InputStream input_stream = new BufferedInputStream(new FileInputStream(
                file));
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        data = new byte[16384]; // 16K
        int bytes_read;
        while ((bytes_read = input_stream.read(data, 0, data.length)) != -1) {
            buffer.write(data, 0, bytes_read);
        }
        input_stream.close();
        return buffer.toByteArray();

    }

}

下面是布局代码：

    <com.facebook.widget.ProfilePictureView
        android:id="@+id/profilePicturePreview"
        android:layout_width="132dp"
        android:layout_height="120dp"
        android:layout_alignTop="@+id/btnFacebookUpload"
        android:layout_toRightOf="@+id/btnPictureSelect"
        android:alpha="1"
        android:background="@drawable/border_image"
        android:cropToPadding="true"
        android:padding="3dp"
        android:scaleType="centerCrop" />

Answer 1

ProfilePictureView扩展了FrameLayout而不是ImageView 。 这就是为什么要获取ClassCastException 。 在这里您可以找到文档

Answer 2

ImageView profilePicture ;
mprofilePicture = (ImageView)findViewById(R.id.profilePicturePreview);

用。。。来代替

ProfilePictureView mprofilePicture;

mprofilePicture = (ProfilePictureView) findViewById(R.id.profilePicturePreview);

然后导入

import com.facebook.widget.ProfilePictureView;