构造意图是不确定的 [英] The constructor Intent is undefined

问题描述

我的内容模块加载，具体的错误我得到的是：构造意图（新View.OnClickListener（）{}，类＆LT; ContactWidget＆gt;）的未定义

对此有何想法？我得到这个从这里教程：<一href="http://developer.android.com/guide/topics/ui/notifiers/notifications.html">http://developer.android.com/guide/topics/ui/notifiers/notifications.html

 包com.example.contactwidget;

进口android.app.Activity;
进口android.app.Notification;
进口android.app.NotificationManager;
进口android.app.PendingIntent;
进口android.content.Context;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;

公共类ContactWidget延伸活动{
    / **第一次创建活动时调用。 * /
    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;

        按钮CALC1 =（按钮）findViewById（R.id.calc_button_1）;
        calc1.setOnClickListener（buttonListener）;

        的setContentView（R.layout.main）;
    }

    私有静态最终诠释HELLO_ID = 1;

    私人OnClickListener buttonListener =新OnClickListener（）{
        公共无效的onClick（视图v）{
            字符串NS = Context.NOTIFICATION_SERVICE;
            NotificationManager mNotificationManager =（NotificationManager）getSystemService（NS）;

            INT图标= R.drawable.icon;
            CharSequence的ticketBrief =按钮pressed简报;
            CharSequence的ticketTitle =按钮pressed;
            CharSequence的ticketText =您pressed按钮1;
            时长= System.currentTimeMillis的（）;

            通知通知=新的通知（图标，ticketBrief时）;

            意图notificationIntent =新的意图（这一点，ContactWidget.class）;
            PendingIntent contentIntent = PendingIntent.getActivity（此，0，notificationIntent，0）;

            notification.setLatestEventInfo（getApplicationContext（），ticketTitle，ticketText，contentIntent）;

            mNotificationManager.notify（HELLO_ID，通知）;
        }
    };
}
 

解决方案

更​​改此：

 新意图（这一点，ContactWidget.class）;
 

到

 新意图（ContactWidget.this，ContactWidget.class）;
 

错误发生，因为，在这种情况下，这所引用 OnClickListener 的实例，但意图的构造函数使用上下文。你必须通过上下文的参照活动本身，因此，你必须明确地使用访问它 ContactWidget.this 。

I have the content module loaded, the specific error I'm getting is: The constructor Intent(new View.OnClickListener(){}, Class<ContactWidget>) is undefined

Any ideas on this? I got this from the tutorial here: http://developer.android.com/guide/topics/ui/notifiers/notifications.html

package com.example.contactwidget;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class ContactWidget extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Button calc1 = (Button) findViewById(R.id.calc_button_1);
        calc1.setOnClickListener(buttonListener);

        setContentView(R.layout.main);
    }

    private static final int HELLO_ID = 1;

    private OnClickListener buttonListener = new OnClickListener() {
        public void onClick (View v) {
            String ns = Context.NOTIFICATION_SERVICE;
            NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

            int icon = R.drawable.icon;
            CharSequence ticketBrief = "Button Pressed Brief";
            CharSequence ticketTitle = "Button pressed";
            CharSequence ticketText = "You pressed button 1";
            long when = System.currentTimeMillis();

            Notification notification = new Notification(icon, ticketBrief, when);

            Intent notificationIntent = new Intent(this, ContactWidget.class);
            PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

            notification.setLatestEventInfo(getApplicationContext(), ticketTitle, ticketText, contentIntent);

            mNotificationManager.notify(HELLO_ID, notification);
        }
    };
}

解决方案

Change this:

new Intent(this, ContactWidget.class);

to

new Intent(ContactWidget.this, ContactWidget.class);

The error happens because, in that case, this is referencing the instance of OnClickListener, but the Intent's constructor expects a Context. The context you have to pass is the reference to the activity itself, thus you have to access it explicitly using ContactWidget.this.

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