Fatal Exception: String can't be cast to Spannable

问题

My app works greatly with the exception of a few devices. On one such device, I get a FATAL EXCEPTION in one of my activities. The error is java.lang.ClassCastException: java.lang.String cannot be cast to android.text.Spannable ... ... at android.widget.TextView.setEnabled(TextView.java:1432)

STACK TRACE

05-02 09:18:19.917: E/AndroidRuntime(20587): FATAL EXCEPTION: main
05-02 09:18:19.917: E/AndroidRuntime(20587): java.lang.ClassCastException: java.lang.String cannot be cast to android.text.Spannable
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.widget.TextView.setEnabled(TextView.java:1432)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at com.myapp.android.menu.LoginFragment.checkIfAnyFieldIsEmpty(LoginFragment.java:512)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at com.myapp.android.menu.LoginFragment.onCreateView(LoginFragment.java:183)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.os.Handler.handleCallback(Handler.java:615)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.os.Handler.dispatchMessage(Handler.java:92)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.os.Looper.loop(Looper.java:137)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at android.app.ActivityThread.main(ActivityThread.java:4962)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at java.lang.reflect.Method.invokeNative(Native Method)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at java.lang.reflect.Method.invoke(Method.java:511)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
05-02 09:18:19.917: E/AndroidRuntime(20587):    at dalvik.system.NativeStart.main(Native Method)

Here are the snippets of code surrounding the error.

XML LAYOUT CODE

<com.myapp.android.view.StyledButton
        android:id="@+id/login_sign_in"
        style="@style/button_blue"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/state_list_login"
        android:textColor="@color/white"
        android:imeOptions="actionDone"
        android:padding="10dp"
        android:text="@string/sign_in" />

CUSTOM BUTTON JAVA CODE

public class StyledButton extends Button {
//variables
private final String BOLD = "fonts/arial.ttf";
private final String NORMAL = "fonts/arial_bold.ttf";

private String mCustomFont = null;

/**
 * Constructor
 * @param context
 */
public StyledButton(Context context) {
    super(context);
}

/**
 * Constructor
 * @param context
 * @param attrs
 */
public StyledButton(Context context, AttributeSet attrs) {
    super(context, attrs);
    setCustomAttributes(attrs);
}

/**
 * Set custom attributes
 * @param attrs
 */
private void setCustomAttributes(AttributeSet attrs) {
    TypedArray a=getContext().obtainStyledAttributes(attrs,R.styleable.StyledTextView);
    mCustomFont = a.getString(R.styleable.StyledTextView_fontAsset);
    if(mCustomFont != null) {
        if(!isInEditMode()) {
            CustomFontManager fontManager = CustomFontManager.getInstance();
            super.setTypeface(fontManager.getFont(getContext().getAssets(), mCustomFont));
        }
    }
    a.recycle();
}

/**
 * Set type face
 */
public void setTypeface(Typeface tf, int style) {
    CustomFontManager fontManager = CustomFontManager.getInstance();
    if(isInEditMode()) {
        super.setTypeface(tf,style);
        return;
    }
    if(mCustomFont!=null) {
        super.setTypeface(fontManager.getFont(getContext().getAssets(), mCustomFont));
        return;
    }
    switch (style) {
        case Typeface.NORMAL:
            super.setTypeface(fontManager.getFont(getContext().getAssets(), NORMAL));
            break;
        case Typeface.BOLD:
            super.setTypeface(fontManager.getFont(getContext().getAssets(), BOLD));
            break;
        default:
            super.setTypeface(fontManager.getFont(getContext().getAssets(), NORMAL));
            break;
    }
}

}

JAVA CODE CAUSING ERROR

    private StyledButton mSignIn;

    public void checkIfAnyFieldIsEmpty() {
    if (mEmailEmpty || mPasswordEmpty) {
        mSignIn.setEnabled(false);
    } else {
        mSignIn.setEnabled(true);
    } 
}

The line of code mSignIn.setEnabled(false) is causing the error. If i comment it out or just replace it so both the if and else read mSignIn.setEnabled(true) the app runs fine.

Again. The code as is works fine on the majority of devices.

回答1:

Did you make your style button as spannable? For example, TextView should be like this

TextView.setText("Hai", TextView.BufferType.SPANNABLE);

回答2:

This may be a little bit late but, make sure the text in the TextView you are trying to Span isn't set as "". For some reason empty strings are not spannable.

回答3:

it seems like i was calling android:imeOptions="actionDone" in the xml layout file. i removed that and it didn't crash anymore.

why?

来源：https://stackoverflow.com/questions/16340681/fatal-exception-string-cant-be-cast-to-spannable

标签

android

crash

classcastexception