不确定如何理解logcat告诉我的信息是错误的

Question

This is the error my logcat is giving me. I understand it has something to do with my editText but i am not sure what.I am hopeing its a dumb mistake that can be fixed quickly and easily so i can keep working ASAP. Help me if you can Stackoverflow Thanks!

The error only occurs when program is ran

02-25 16:30:19.417: E/AndroidRuntime(15259): FATAL EXCEPTION: main
    02-25 16:30:19.417: E/AndroidRuntime(15259): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Wicker/com.Wicker.InviteSMS}: java.lang.ClassCastException: android.widget.EditText
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1816)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1837)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.app.ActivityThread.access$1500(ActivityThread.java:132)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1033)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.os.Handler.dispatchMessage(Handler.java:99)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.os.Looper.loop(Looper.java:143)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.app.ActivityThread.main(ActivityThread.java:4196)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at java.lang.reflect.Method.invokeNative(Native Method)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at java.lang.reflect.Method.invoke(Method.java:507)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at dalvik.system.NativeStart.main(Native Method)
    02-25 16:30:19.417: E/AndroidRuntime(15259): Caused by: java.lang.ClassCastException: android.widget.EditText
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at com.Wicker.InviteSMS.onCreate(InviteSMS.java:48)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1780)
    02-25 16:30:19.417: E/AndroidRuntime(15259):    ... 11 more

This is my xml file:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/contacts"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="10dp"
                android:gravity="center"
                android:paddingBottom="10dp"
                android:paddingLeft="10dp"
                android:paddingTop="10dp"
                android:text="@string/contacts"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:textColor="#fff" /> <!-- android:background="@drawable/header" for header background -->

            <Button
                android:id="@+id/contactsButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_alignParentTop="true"
                android:text="@string/contacts" />
        </RelativeLayout>

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/enter_contact"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <AutoCompleteTextView
            android:id="@+id/contactnumber"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/to" >

            <requestFocus />
        </AutoCompleteTextView>

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/message_to_send"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <EditText
            android:id="@+id/invite_text"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/message_join" />

        <Button
            android:id="@+id/sendtxt"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:onClick="doLaunchContactPicker"
            android:text="@string/send_txt" />
    </LinearLayout>

</ScrollView>

This is the class that runs it.

public class InviteSMS extends Activity {

    private static final int CONTACT_PICKER_RESULT = 1001;
    private static final String DEBUG_TAG = null;

    private SimpleAdapter mAdapter;

    Button btnSendSMS;
    AutoCompleteTextView txtPhoneNo;
    Button Attachment;
    Button contactsbutton;
    Button gallery;
    EditText txtMessage;

    Context context = this;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.invite_text);

        btnSendSMS = (Button) findViewById(R.id.sendtxt);
        txtPhoneNo = (AutoCompleteTextView) findViewById(R.id.contactnumber);
        txtMessage = (EditText) findViewById(R.id.invite_text);
        contactsbutton = (Button) findViewById(R.id.contactsButton);

        txtPhoneNo.setAdapter(mAdapter);

        btnSendSMS.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                String phoneNo = txtPhoneNo.getText().toString();
                String message = txtMessage.getText().toString();

                if (phoneNo.length() > 0 && message.length() > 0)
                    sendSMS(phoneNo, message);
                else
                    Toast.makeText(getBaseContext(),
                            "Please enter both phone number and message.",
                            Toast.LENGTH_SHORT).show();
            }

        });
        contactsbutton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {

                Intent contactPickerIntent = new Intent(Intent.ACTION_PICK,
                        Contacts.CONTENT_URI);
                startActivityForResult(contactPickerIntent,
                        CONTACT_PICKER_RESULT);

            }
        });
    }

    private void sendSMS(String phoneNumber, String message) {
        PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this,
                InviteSMS.class), 0);

        String SENT = "SMS_SENT";
        String DELIVERED = "SMS_DELIVERED";

        PendingIntent sentPI = PendingIntent.getBroadcast(this, 0, new Intent(
                SENT), 0);

        PendingIntent deliveredPI = PendingIntent.getBroadcast(this, 0,
                new Intent(DELIVERED), 0);
        registerReceiver(new BroadcastReceiver() {

            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode()) {
                case Activity.RESULT_OK:
                    Toast.makeText(getBaseContext(), "SMS sent",
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                    Toast.makeText(getBaseContext(), "Generic failure",
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NO_SERVICE:
                    Toast.makeText(getBaseContext(), "No service",
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NULL_PDU:
                    Toast.makeText(getBaseContext(), "Null PDU",
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_RADIO_OFF:
                    Toast.makeText(getBaseContext(), "Radio off",
                            Toast.LENGTH_SHORT).show();
                    break;
                }
            }
        }, new IntentFilter(SENT));

        // ---when the SMS has been delivered---
        registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode()) {
                case Activity.RESULT_OK:
                    Toast.makeText(getBaseContext(), "SMS delivered",
                            Toast.LENGTH_SHORT).show();
                    break;
                case Activity.RESULT_CANCELED:
                    Toast.makeText(getBaseContext(), "SMS not delivered",
                            Toast.LENGTH_SHORT).show();
                    break;
                }
            }
        }, new IntentFilter(DELIVERED));

        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            switch (requestCode) {
            case CONTACT_PICKER_RESULT:
                Cursor cursor = null;
                String phone = "";
                try {
                    Bundle extras = data.getExtras();
                    Set<String> keys = extras.keySet();
                    Iterator<String> iterate = keys.iterator();
                    while (iterate.hasNext()) {
                        String key = iterate.next();
                        Log.v(DEBUG_TAG, key + "[" + extras.get(key) + "]");
                    }

                    Uri result = data.getData();
                    Log.v(DEBUG_TAG,
                            "Got a contact result: " + result.toString());

                    // get the contact id from the Uri
                    String id = result.getLastPathSegment();

                    cursor = getContentResolver().query(Phone.CONTENT_URI,
                            null, Phone.CONTACT_ID + "=?", new String[] { id },
                            null);

                    int phoneIdx = cursor.getColumnIndex(Phone.DATA);

                    if (cursor.moveToFirst()) {

                        phone = cursor.getString(phoneIdx);

                        Log.v(DEBUG_TAG, "Got Contact: " + phone);

                    } else {
                        Log.w(DEBUG_TAG, "No results");
                    }
                } catch (Exception e) {
                    Log.e(DEBUG_TAG, "Failed to get phone data", e);
                } finally {
                    if (cursor != null) {
                        cursor.close();
                    }
                    EditText phoneEntry = (EditText) findViewById(R.id.invite_text);
                    phoneEntry.setText(phone);
                    if (phone.length() == 0) {
                        Toast.makeText(this,
                                "No Phone Number found for contact.",
                                Toast.LENGTH_LONG).show();
                    }

                }

                break;
            }

        } else {
            Log.w(DEBUG_TAG, "Warning: activity result not ok");
        }
    }

}

Answer 1

You get a ClassCastException at this line:

txtMessage = (EditText) findViewById(R.id.invite_text);

That means the View object with the id R.id.invite_text is not EditText . However this is not true since invite_text is indeed of type EditText .

    <EditText
        android:id="@+id/invite_text"
        android:layout_width="fill_parent"
        ...
        " />

So I think your resource file is not up to date. The code looks all right. Delete your gen folder and run it again. Your resource file should be recreated when you delete gen folder.

Answer 2

单击Project菜单，然后选择Clean...选择您的项目，然后单击确定。