致命异常:字符串无法转换为 Spannable [英] Fatal Exception: String can't be cast to Spannable

问题描述

除了少数设备外，我的应用运行良好.在一个这样的设备上，我在我的一项活动中遇到了一个致命的异常.错误是 java.lang.ClassCastException: java.lang.String cannot be cast to android.text.Spannable ... ... 在 android.widget.TextView.setEnabled(TextView.java:1432)

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)

堆栈跟踪

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)

以下是围绕错误的代码片段.

Here are the snippets of code surrounding the error.

XML 布局代码

<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" />

自定义按钮 JAVA 代码

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 代码导致错误

    private StyledButton mSignIn;

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

代码行 mSignIn.setEnabled(false) 导致错误.如果我将其注释掉或只是替换它，以便 if 和 else 都读取 mSignIn.setEnabled(true) 应用程序运行正常.

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.

再次.代码在大多数设备上都可以正常工作.

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

推荐答案

好像我在 xml 布局文件中调用了 android:imeOptions="actionDone".我删除了它，它不再崩溃了.

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

为什么?

这篇关于致命异常:字符串无法转换为 Spannable的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！