Question

我正在尝试使用以下示例实现自定义键盘：

http://www.fampennings.nl/maarten/android/09keyboard/index.htm

然而，不是像文章中描述的那样实现它的活动 - 我试图在一个片段中实现它，我似乎无法在不抛弃NPE的情况下使其工作。

我不确定在这种情况下我做错了什么 - 但是非常感谢任何建议/输入。

05-12 09:48:10.300: E/AndroidRuntime(3664): FATAL EXCEPTION: main
05-12 09:48:10.300: E/AndroidRuntime(3664): java.lang.NullPointerException
05-12 09:48:10.300: E/AndroidRuntime(3664):     at com.example.project.CustomKeyboard.<init>(CustomKeyboard.java:111)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at com.example.project.LoginDialog.onCreateDialog(LoginDialog.java:64)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.app.DialogFragment.getLayoutInflater(DialogFragment.java:398)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.app.BackStackRecord.run(BackStackRecord.java:682)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.os.Handler.handleCallback(Handler.java:725)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.os.Handler.dispatchMessage(Handler.java:92)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.os.Looper.loop(Looper.java:137)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at android.app.ActivityThread.main(ActivityThread.java:5041)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at java.lang.reflect.Method.invokeNative(Native Method)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at java.lang.reflect.Method.invoke(Method.java:511)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-12 09:48:10.300: E/AndroidRuntime(3664):     at dalvik.system.NativeStart.main(Native Method)

CustomKeyboard.java:111

是

mKeyboardView.setKeyboard(new Keyboard(mHostActivity, layoutid));


LoginDialog.java:64

是

mCustomKeyboard= new CustomKeyboard(this, R.id.keyboardview, R.xml.hexkbd );

CustomKeyboard.java

public CustomKeyboard(LoginDialog loginDialog, int viewid, int layoutid) {
    mHostActivity= loginDialog.getActivity();
    mKeyboardView= (KeyboardView)mHostActivity.findViewById(viewid);
    mKeyboardView.setKeyboard(new Keyboard(mHostActivity, layoutid));
    mKeyboardView.setPreviewEnabled(false); // NOTE Do not show the preview balloons
    mKeyboardView.setOnKeyboardActionListener(mOnKeyboardActionListener);
    // Hide the standard keyboard initially
    mHostActivity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}

LoginDialog.java

 public class LoginDialog extends DialogFragment implements ActionCompletedListener{
    private SingletonVariables variables;

    private View view;
    private TextView error;
    private String whichActivity = "";
    CustomKeyboard mCustomKeyboard;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(getActivity(),R.style.HoloDarkDialog));
        LayoutInflater inflater = getActivity().getLayoutInflater();
        variables = SingletonVariables.getInstance();
        view = inflater.inflate(R.layout.login, null);
        EditText userEditText = (EditText) view.findViewById(R.id.loginUserIdEditText);
        mCustomKeyboard= new CustomKeyboard(this, R.id.keyboardview, R.xml.hexkbd );
        mCustomKeyboard.registerEditText(R.id.loginUserIdEditText); 
                mCustomKeyboard.registerEditText(R.id.loginPasswordEditText); 
        if(variables.login.sessionPassword != null) {
            userEditText.setText(variables.login.sessionUser);
        }

Answer 1

我遇到了同样的问题，我想我明白了。尝试将View变量添加到CustomKeyboard类，如下所示：

private View mRootView;

然后修改构造函数：

 public CustomKeyboard(Activity host, View rootView, int viewid, int layoutid) {
    mHostActivity= host;
    mRootView = rootView;
    mKeyboardView= (KeyboardView)mRootView.findViewById(viewid);
    mKeyboardView.setKeyboard(new Keyboard(mHostActivity, layoutid));
    mKeyboardView.setPreviewEnabled(false); // NOTE Do not show the preview balloons
    mKeyboardView.setOnKeyboardActionListener(mOnKeyboardActionListener);
    mHostActivity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

}

修改registerEditText（）以便：

EditText edittext= (EditText)mHostActivity.findViewById(resid);

变为：

EditText edittext= (EditText)mRootView.findViewById(resid);

然后更改DialogFragment onCreateDialog（）中的调用，如下所示：

    @Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(getActivity(),R.style.HoloDarkDialog));
    LayoutInflater inflater = getActivity().getLayoutInflater();
    variables = SingletonVariables.getInstance();
    view = inflater.inflate(R.layout.login, null);
    EditText userEditText = (EditText) view.findViewById(R.id.loginUserIdEditText);
    mCustomKeyboard= new CustomKeyboard(getActivity() , view , R.id.keyboardview, R.xml.hexkbd );
    mCustomKeyboard.registerEditText(R.id.loginUserIdEditText); 
    mCustomKeyboard.registerEditText(R.id.loginPasswordEditText); 
    if(variables.login.sessionPassword != null) {
    userEditText.setText(variables.login.sessionUser);
    }

我希望这有助于某人（我想OP已经找到了一些东西），但这是我第一次有所贡献，我有点兴奋。

Answer 2

您的问题是，当您实例化LoginDialog时，Activity未附加到任何CustomKeyboard，因此：

loginDialog.getActivity() is null

您可以使用回调onAttach来实例化CustomKeyboard，因为此时对话框已附加到活动

试试这个：

public void onAttach(Activity hostActivity) {
    super.onAttach(hostActivity);

    mCustromKeyboard = new CustomKeyboard(activity, R.id.keyboardview, R.xml.hexkbd ));
    mCustromKeyboard.registerEditText(R.id.loginUserIdEditText); 
    mCustromKeyboard.registerEditText(R.id.loginPasswordEditText); 
}

无法使用Android Fragment实现自定义键盘 - 空指针异常

CustomKeyboard.java

LoginDialog.java

2 个答案: