java - 尝试存储数据时发生意外错误

Question

我在尝试启动应用程序时收到意外错误。 logcat上没有显示任何信息，但我认为这是由于以下原因造成的:1)尝试将用户记录的seekbar值信息存储到parse中以便以后能够检索它。存储 EditText(例如姓名、年龄、标题和单选框(例如性别))效果很好，但当我包含搜索时，应用程序无法运行。

下面是 Activity 代码

...

下面是布局代码尽管我认为问题更多在于 profileactivity Activity 代码

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollProfile"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/dark_texture_blue" >

<RelativeLayout
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="797dp"
    android:gravity="center"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/profilePicturePreview"
        android:layout_width="132dp"
        android:layout_height="120dp"
        android:layout_below="@+id/textView5"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="7dp"
        android:layout_marginBottom="9dp"
        android:padding="3dp"
        android:scaleType="centerCrop"
        android:cropToPadding="true"
        android:background="@drawable/border_image"
        android:alpha="1" />

    <Button
        android:id="@+id/bRemove"
        android:layout_width="120dp"
        android:layout_height="60dp"
        android:layout_above="@+id/etxtage"
        android:layout_alignLeft="@+id/etxtname"
        android:alpha="0.8"
        android:background="#330099"
        android:text="Upload from Facebook"
        android:textColor="#ffffff"
        android:textSize="17sp"
        android:textStyle="bold" />

    <Button
        android:id="@+id/btnPictureSelect"
        android:layout_width="118dp"
        android:layout_height="60dp"
        android:layout_alignRight="@+id/etxtname"
        android:layout_below="@+id/profilePicturePreview"
        android:layout_marginRight="8dp"
        android:alpha="0.8"
        android:background="#000000"
        android:onClick="pickPhoto"
        android:text="Select photo from gallery"
        android:textColor="#ffffff"
        android:textSize="17sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView4"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="9dp"
        android:text="Preferred Name"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#ADD8E6"
        android:textSize="20sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="39dp"
        android:gravity="center"
        android:text="Profile Creation"
        android:textColor="#ffffff"
        android:textSize="28sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <EditText
        android:id="@+id/etxtname"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView6"
        android:layout_centerHorizontal="true"
        android:ems="10"
        android:enabled="true"
        android:hint="Please type your name here"
        android:inputType="textPersonName"
        android:textColor="#ffffff"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/etxtname"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="8dp"
        android:text="Upload your Profile Picture"
        android:textColor="#f2f2f2"
        android:textSize="18sp"
        android:textStyle="bold"
        android:typeface="sans" />

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_alignLeft="@+id/etxtheadline"
        android:layout_height="wrap_content"
        android:layout_below="@+id/texperience"
        android:layout_toLeftOf="@+id/textView3" >

        <RadioButton
            android:id="@+id/rimale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="Male"
            android:textColor="#f2f2f2" />

        <RadioButton
            android:id="@+id/rifemale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Female"
            android:textColor="#f2f2f2" />
    </RadioGroup>

    <SeekBar
        android:id="@+id/seekBarDistance"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView12"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="11dp"
        android:progress="50" />

    <RadioGroup
        android:id="@+id/radioGroup3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView4"
        android:layout_alignTop="@+id/radioGroup2"
        android:layout_marginTop="10dp" >
    </RadioGroup>

    <RadioGroup
        android:id="@+id/radioGroup2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/etxtheadline"
        android:layout_below="@+id/textView2" >

        <RadioButton
            android:id="@+id/rlmale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="Male"
            android:textColor="#f2f2f2" />

        <RadioButton
            android:id="@+id/rlfemale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Female"
            android:textColor="#f2f2f2" />
    </RadioGroup>

    <SeekBar
        android:id="@+id/seekBarMinimumAge"
        android:layout_width="220dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/textView7"
        android:layout_marginTop="11dp"
        android:progress="25" />

    <TextView
        android:id="@+id/textView7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/etxtage"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="Minimum Age Looking For"
        android:textColor="#f2f2f2"
        android:textSize="16sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <TextView
        android:id="@+id/seekBarDistanceValue"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/tMinAge"
        android:layout_below="@+id/seekBarDistance"
        android:text="50"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#f2f2f2"
        android:textSize="20sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <TextView
        android:id="@+id/textView12"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/radioGroup1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="19dp"
        android:text="Search Distance "
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#ADD8E6"
        android:textSize="20sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <TextView
        android:id="@+id/tMinAge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/seekBarMinimumAge"
        android:layout_centerHorizontal="true"
        android:text="25"
        android:textColor="#f2f2f2"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/textView8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tMaxAge"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="15dp"
        android:text="Headline"
        android:textColor="#ADD8E6"
        android:textSize="20sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <TextView
        android:id="@+id/textView14"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tMinAge"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="15dp"
        android:text="Maximum Age Looking For"
        android:textColor="#f2f2f2"
        android:textSize="16sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <SeekBar
        android:id="@+id/seekBarMaximumAge"
        android:layout_width="221dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView14"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="11dp"
        android:progress="50" />

    <TextView
        android:id="@+id/tMaxAge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/seekBarMaximumAge"
        android:layout_centerHorizontal="true"
        android:text="50"
        android:textColor="#f2f2f2"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/conditions"
        android:layout_width="280dp"
        android:layout_height="130dp"
        android:layout_below="@+id/btnConfirm"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="7dp"
        android:layout_marginTop="7dp"
        android:alpha="0.6"
        android:gravity="center"
        android:text="@string/disclaimer"
        android:textColor="#99CCFF"
        android:textSize="12sp" />

    <Button
        android:id="@+id/btnConfirm"
        android:layout_width="120dp"
        android:layout_height="60dp"
        android:layout_below="@+id/seekBarDistanceValue"
        android:layout_marginBottom="7dp"
        android:layout_marginTop="14dp"
        android:layout_toRightOf="@+id/seekBarDistanceValue"
        android:alpha="0.8"
        android:background="#151B54"
        android:text="Confirm"
        android:textColor="#ffffff"
        android:textSize="17sp"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/etxtheadline"
        android:layout_width="270dp"
        android:layout_height="70dp"
        android:layout_below="@+id/textView8"
        android:layout_centerHorizontal="true"
        android:hint="A quick description of yourself"
        android:singleLine="true"
        android:textAlignment="center"
        android:textColor="#f2f2f2"
        android:textSize="18dp" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/etxtage"
        android:layout_width="230dp"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView4"
        android:layout_below="@+id/btnPictureSelect"
        android:layout_marginTop="48dp"
        android:ems="10"
        android:hint="Please type your age here"
        android:inputType="number"
        android:maxLength="2"
        android:textAlignment="center"
        android:textColor="#f2f2f2"
        android:textSize="18dp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/radioGroup1"
        android:layout_alignRight="@+id/btnConfirm"
        android:text="Looking for"
        android:textColor="#ADD8E6"
        android:textSize="20sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/texperience"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/radioGroup1"
        android:layout_below="@+id/etxtheadline"
        android:layout_marginTop="39dp"
        android:text="I am a"
        android:textColor="#ADD8E6"
        android:textSize="20sp"
        android:textStyle="bold" />

    <Button
        android:id="@+id/btnBack"
        android:layout_width="120dp"
        android:layout_height="60dp"
        android:layout_alignBaseline="@+id/btnConfirm"
        android:layout_alignBottom="@+id/btnConfirm"
        android:layout_alignLeft="@+id/radioGroup1"
        android:alpha="0.8"
        android:background="#25383C"
        android:text="Back"
        android:textColor="#ffffff"
        android:textSize="17sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/bRemove"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="19dp"
        android:text="Age"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#ADD8E6"
        android:textSize="20sp"
        android:textStyle="bold"
        android:typeface="serif" />

</RelativeLayout>

</ScrollView>

预先感谢您的帮助。任何帮助将不胜感激，如果您需要任何说明，请告诉我。

更新2

public class ProfileCreation extends Activity {

    private static final int RESULT_LOAD_IMAGE = 1;
    FrameLayout layout;
    Button save;
    protected EditText mName;
    protected EditText mAge;
    protected EditText mHeadline;
    protected ImageView mprofilePicture;
    RadioButton male, female;
    String gender;
    RadioButton lmale, lfemale;
    String lgender;
    protected SeekBar seekBarMinimum;
    protected SeekBar seekBarMaximum;
    protected SeekBar seekBarDistance;


    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", "ID");

        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.tvseekBarDistanceValue);




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

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




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

                if (age.isEmpty() || 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();

                     seekBarMaximum.getProgress();
                     seekBarMinimum.getProgress();
                     seekBarDistance.getProgress();



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

                    if(lmale.isChecked())
                        lgender = "Male";
                    else
                        lgender = "Female";


                    currentUser.put("Name", name); 
                    currentUser.put("Age", age); 
                    currentUser.put("Headline", headline); 
                    currentUser.put("Gender", gender);
                    currentUser.put("Looking_Gender", lgender);
                    currentUser.put("Minimum_Age", seekBarMinimum);
                    currentUser.put("Maximum_Age", seekBarMaximum);
                    currentUser.put("Maximum_Distance_Age", seekBarDistance);




                    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_title)
                                    .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 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 
                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);
            }
        });

    } 

        @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();

        }
    }

日志猫

08-13 00:11:26.924: E/AndroidRuntime(9155): FATAL EXCEPTION: main
08-13 00:11:26.924: E/AndroidRuntime(9155): Process: com.dooba.beta, PID: 9155
08-13 00:11:26.924: E/AndroidRuntime(9155): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dooba.beta/com.dooba.beta.ProfileCreation}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.SeekBar
08-13 00:11:26.924: E/AndroidRuntime(9155):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)

Answer 1

教训:

再一次，不遵循命名约定会导致错误。下次我建议您在 TextView 上添加 tv 前缀，在搜索栏上添加 sb 前缀，在按钮上添加 b 等前缀。

截至Oracle Docs :

Subsequent characters may be letters, digits, dollar signs, or underscore characters. Conventions (and common sense) apply to this rule as well. When choosing a name for your variables, use full words instead of cryptic abbreviations. Doing so will make your code easier to read and understand. In many cases it will also make your code self-documenting; fields named cadence, speed, and gear, for example, are much more intuitive than abbreviated versions, such as s, c, and g. Also keep in mind that the name you choose must not be a keyword or reserved word.

最后，问题本身:

    In Activity.java:
    seekBarDistance = (SeekBar) findViewById(R.id.seekBarDistanceValue);
    final TextView seekBarValue = (TextView) findViewById(R.id.seekBarDistanceValue);

    In layout.xml:
    <TextView
        android:id="@+id/seekBarDistanceValue"