Android的发展：按钮onClickListeners帮助 [英] Android Development: Button onClickListeners Help

问题描述

基本上，到目前为止，我刚刚得到了一个附加和减号按钮，这将改变一个TextView的价值。

我也跟着上 HTTP下的事件监听器第二个例子：/ /developer.android.com/guide/topics/ui/ui-events.html

现在的问题是，我得到4个错误，当我去编译，我不明白我在做什么错了？

请能有人指出，如果有什么错误，或者给我一个简单的方法吧。

感谢您的时间。

下面是错误的：

<$p$p><$c$c>/home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:19: com.alex.golfscorecard.MainActivity不是抽象的，不以android.content.DialogInterface.OnClickListener覆盖抽象方法的onClick（android.content.DialogInterface，INT） 公共类MainActivity扩展活动实现OnClickListener { /home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:49：setOnClickListener（android.view.View.OnClickListener）在android.view.View不能适用于（com.alex.golfscorecard。主要活动）         buttonMinus.setOnClickListener（本）; /home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:50：setOnClickListener（android.view.View.OnClickListener）在android.view.View不能适用于（com.alex.golfscorecard。主要活动）         buttonPlus.setOnClickListener（本）; /home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:51：setOnClickListener（android.view.View.OnClickListener）在android.view.View不能适用于（com.alex.golfscorecard。主要活动）         buttonOK.setOnClickListener（本）;

下面是我的code：

 包com.alex.golfscorecard;

进口android.app.Activity;
进口android.content.DialogInterface.OnClickListener;
进口android.os.Bundle;
进口android.view.View;
进口android.widget.Button;
进口android.widget.TextView;

/ **
 *
 * @author亚历克斯
 * /
公共类MainActivity扩展活动实现OnClickListener {
  按钮buttonMinus，buttonPlus，buttonOK;
  TextView的golfScore;

    //实施OnClickListener回调
    //不完整的！
    公共无效的onClick（视图v）{
      开关（v.getId（））{
          案例R.id.buttonMinus：
          得分了 - ;
          打破;
          案例R.id.buttonPlus：
          进球++;
          打破;
      }
    }

    / **第一次创建活动时调用。 * /
    @覆盖
    公共无效的onCreate（包冰柱）{
        super.onCreate（冰柱）;
        的setContentView（R.layout.main）;

        //设置UI元素，并找到自己的main.xml中查看
        buttonMinus =（按钮）findViewById（R.id.buttonMinus）;
        buttonPlus =（按钮）findViewById（R.id.buttonPlus）;
        buttonOK =（按钮）findViewById（R.id.buttonOK）;
        golfScore =（TextView中）findViewById（R.id.golfScore）;

        //设置上点击监听器的UI元素
        buttonMinus.setOnClickListener（本）;
        buttonPlus.setOnClickListener（本）;
        buttonOK.setOnClickListener（本）;

    }

}
 

解决方案

您已经导入错误OnClickListener。更改

 进口android.content.DialogInterface.OnClickListener;
 

到

 进口android.view.View.OnClickListener;
 

Basically, so far I've just got an add and minus button which will change the value of a TextView.

I followed the second example under "Event Listeners" on http://developer.android.com/guide/topics/ui/ui-events.html

The problem is I get 4 errors when I go to compile, I don't see what I'm doing wrong?

Please can someone point out if there is anything wrong, or show me a simpler way please.

Thank you for your time.

Here's the errors:

/home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:19: com.alex.golfscorecard.MainActivity is not abstract and does not override abstract method onClick(android.content.DialogInterface,int) in android.content.DialogInterface.OnClickListener
public class MainActivity extends Activity implements OnClickListener{
/home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:49: setOnClickListener(android.view.View.OnClickListener) in android.view.View cannot be applied to (com.alex.golfscorecard.MainActivity)
        buttonMinus.setOnClickListener(this);
/home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:50: setOnClickListener(android.view.View.OnClickListener) in android.view.View cannot be applied to (com.alex.golfscorecard.MainActivity)
        buttonPlus.setOnClickListener(this);
/home/alex/NetBeansProjects/GolfScoreCard/src/com/alex/golfscorecard/MainActivity.java:51: setOnClickListener(android.view.View.OnClickListener) in android.view.View cannot be applied to (com.alex.golfscorecard.MainActivity)
        buttonOK.setOnClickListener(this);

Here is my code:

package com.alex.golfscorecard;

import android.app.Activity;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

/**
 *
 * @author alex
 */
public class MainActivity extends Activity implements OnClickListener{
  Button buttonMinus, buttonPlus, buttonOK;
  TextView golfScore;

    // Implement the OnClickListener callback
    // Incomplete!
    public void onClick(View v) {
      switch(v.getId()){
          case R.id.buttonMinus:
          score--;
          break;
          case R.id.buttonPlus:
          score++;
          break;
      }
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);

        //Set the UI elements and find their view in main.xml
        buttonMinus = (Button) findViewById(R.id.buttonMinus);
        buttonPlus = (Button) findViewById(R.id.buttonPlus);
        buttonOK = (Button) findViewById(R.id.buttonOK);
        golfScore = (TextView) findViewById(R.id.golfScore);

        //Set the UI elements' on click listeners
        buttonMinus.setOnClickListener(this);
        buttonPlus.setOnClickListener(this);
        buttonOK.setOnClickListener(this);

    }

}

解决方案

You have imported wrong OnClickListener. Change

import android.content.DialogInterface.OnClickListener;

to

import android.view.View.OnClickListener;

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