安卓DialogFragment安卓的onClick =＆QUOT; buttonCancel＆QUOT;导致IllegalStateException异常无法找到一个方法 [英] android DialogFragment android:onClick="buttonCancel" causes IllegalStateException could not find a method

问题描述

我和我的对话片段的一个问题。我想用机器人：onclick属性在我看来code更清楚再

I have a problem with my Dialog Fragment. I wanted to use android:onClick attribute as in my opinion code is more clear then.

在我的布局，我有以下声明：

In my layout I have the following declaration:

<Button
        android:id="@+id/dialog_new_database_button_cancel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="@string/button_cancel"
        android:maxLines="1"
        style="?android:attr/buttonBarButtonStyle"
        android:onClick="buttonCancel"
        />

现在我DialogFragment

Now my DialogFragment

import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class DialogNewDatabase extends DialogFragment {

    public DialogNewDatabase() {
        // Empty constructor required for DialogFragment
        super();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    super.onCreateView (inflater, container, savedInstanceState);
        View view = inflater.inflate(R.layout.dialog_new_database, container);    
        getDialog().setTitle("Hello");
        return view;
    }

    @Override
    public void onCreate(Bundle bundle) {
        setCancelable(true);
        setRetainInstance(true);
        super.onCreate(bundle);

    }

    @Override
    public void onDestroyView() {
        if (getDialog() != null && getRetainInstance())
            getDialog().setDismissMessage(null);
        super.onDestroyView();
    }

    public void buttonCancel (View view) {
        dismiss();
    }

    public void buttonOK (View view) {

    }

}

我现在当我尝试点击取消按钮，我得到的：

I now when I try to click cancel button I get:

java.lang.IllegalStateException: Could not find a method buttonCancel(View) in the activity class android.view.ContextThemeWrapper for onClick handler on view class android.widget.Button with id 'dialog_new_database_button_cancel'
at android.view.View$1.onClick(View.java:3031)
at android.view.View.performClick(View.java:3511)
at android.view.View$PerformClick.run(View.java:14105)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4482)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoSuchMethodException: buttonCancel [class android.view.View]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getMethod(Class.java:915)
at android.view.View$1.onClick(View.java:3024)
... 11 more

你知道吗？是，也许是某种联系与我用的是进口android.support.v4.app.DialogFragment（支持V4）的事实？如何解决（我仍然会preFER使用安卓的onClick在XML布局）。

Any idea? Is that perhaps somehow related with the fact I use import android.support.v4.app.DialogFragment (support v4)? How to solve that (I still would prefer to use android:onClick in xml layout).

推荐答案

我会尝试不同的方法，它为我工作得很好：

I would try a different approach which works fine for me:

1. 实施OnClickListener到您的片段：

1. implement an OnClickListener into your fragment:

public class DialogNewDatabase extends DialogFragment implements OnClickListener`

有一个唯一的ID在XML中，一个按钮，做不会需要机器人：可点击

<Button  android:id="@+id/dialog_new_database_button_cancel" />

覆盖的方法的onClick（）的片段中，并插入你的点击反应：

override the method onClick() within your fragment and insert a reaction on your click:

public void onClick(View v) {       
  switch (v.getId()) {
    case R.id.dialog_new_database_button_cancel:
        // your stuff here
        this.dismiss();

        break;          
    default:                
        break;
   }
}   

导入必要的：

import the necessary:

import android.view.View.OnClickListener; 

开始onClickListener按钮：

start the onClickListener on the button:

private Button bCancel = null;
bCancel = (Button) findViewById(R.id.dialog_new_database_button_cancel);
bCancel.setOnClickListener(this);
// it is possible that you might need the refrence to the view.
// replace 2nd line with (Button) getView().findViewById(...);

此方式，您可以处理在相同的onClick法更可点击的按钮。你只需要你点击小工具的正确的ID添加更多的情况。

This way you can handle even more clickable buttons in the same onClick-method. You just need to add more cases with the proper ids of your clickable widgets.

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