如何添加按钮单击事件中的android工作室 [英] how to add button click event in android studio

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问题描述

所以,我做了一些调查,并确定你按键为对象由code后

 专用按钮buttonname;
buttonname =(按钮)findViewById(R.id.buttonnameinandroid);
 

下面是我的问题。

  buttonname.setOnClickListener(本); //我的理解中,**这**表示在Android程序中的当前`视图(重点)`
 

那么你的的OnClick()事件...

问题:

当我键入本,它说:

  setOnClickListener(Android.View.view.OnClickListener)的视图不能适用于(com.helloandroidstudio.MainActivity)
 

我不知道为什么?

下面是从.java文件的code

 进口android.widget.Button;
进口android.widget.EditText;
进口android.widget.TextView;

公共类MainActivity扩展ActionBarActivity {

    私人按钮btnClick;
    私人的EditText名称,日期;
    私人TextView的味精,NameOut,DateOut;
    @覆盖
    保护无效的onCreate(包savedInstanceState){
        super.onCreate(savedInstanceState);
        的setContentView(R.layout.main);
        btnClick =(按钮)findViewById(R.id.button);
        btnClick.setOnClickListener(本);
        名称=(EditText上)findViewById(R.id.textenter);
        日期=(EditText上)findViewById(R.id.editText);
        味精=(TextView中)findViewById(R.id.txtviewOut);
        NameOut =(TextView中)findViewById(R.id.txtoutName);
        DateOut =(TextView中)findViewById(R.id.txtOutDate);
        如果(savedInstanceState == NULL){
            getSupportFragmentManager()的BeginTransaction()
                    。新增(R.id.container,新PlaceholderFragment())
                    。承诺();
        }
    }

    公共无效的onClick(视图v)
    {
        如果(V == btnClick)
        {
            如果(Name.equals()==假放;&安培; Date.equals()==假)
            {
                NameOut =名称;
                DateOut =日期;
                msg.setVisibility(View.VISIBLE);
            }
            其他
            {
                msg.setText(请填写这两个字段);
                msg.setVisibility(View.VISIBLE);
            }
        }
        返回;

    }
 

解决方案
  

SetOnClickListener(Android.View.view.OnClickListener)的视图不能   被应用到(com.helloandroidstudio.MainActivity)

这意味着,换言之(由于您目前的情况),您的MainActivity需要实施 OnClickListener

 公共类主要扩展ActionBarActivity实现View.OnClickListener {
   //做你的东西
}
 

本:

  buttonname.setOnClickListener(本);
 

表示要为其指定监听器为您的按钮的在这种情况下 - &GT; 这种情况下再presents <强> OnClickListener 基于这个原因,你的类必须实现该接口。

这是匿名监听类相似(您也可以使用):

  buttonname.setOnClickListener(新View.OnClickListener(){

   @覆盖
   公共无效的onClick(视图查看){

   }
});
 

So I have done some research, and after defining you button as an object by the code

private Button buttonname;
buttonname = (Button) findViewById(R.id.buttonnameinandroid) ;

here is my problem

buttonname.setOnClickListener(this); //as I understand it, the "**this**" denotes the current `view(focus)` in the android program

then your OnClick() event...

Problem:

When I type in the "this", it says:

setOnClickListener (Android.View.view.OnClickListener) in View cannot be applied to (com.helloandroidstudio.MainActivity)

I have no idea why?

here is the code from the .java file

import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

    private Button btnClick;
    private EditText Name, Date;
    private TextView msg, NameOut, DateOut;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btnClick = (Button) findViewById(R.id.button) ;
        btnClick.setOnClickListener(this);
        Name = (EditText) findViewById(R.id.textenter) ;
        Date = (EditText) findViewById(R.id.editText) ;
        msg = (TextView) findViewById(R.id.txtviewOut) ;
        NameOut = (TextView) findViewById(R.id.txtoutName) ;
        DateOut = (TextView) findViewById(R.id.txtOutDate) ;
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
    }

    public void onClick(View v)
    {
        if (v == btnClick)
        {
            if (Name.equals("") == false && Date.equals("") == false)
            {
                NameOut = Name;
                DateOut = Date;
                msg.setVisibility(View.VISIBLE);
            }
            else
            {
                msg.setText("Please complete both fields");
                msg.setVisibility(View.VISIBLE);
            }
        }
        return;

    }

解决方案

SetOnClickListener (Android.View.view.OnClickListener) in View cannot be applied to (com.helloandroidstudio.MainActivity)

This means in other words (due to your current scenario) that your MainActivity need to implement OnClickListener:

public class Main extends ActionBarActivity implements View.OnClickListener {
   // do your stuff
}

This:

buttonname.setOnClickListener(this);

means that you want to assign listener for your Button "on this instance" -> this instance represents OnClickListener and for this reason your class have to implement that interface.

It's similar with anonymous listener class (that you can also use):

buttonname.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View view) {

   }
});

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