将一个活动中的两个按钮连接到另外两个活动

Question

我想做一个简单的数学游戏，有两种模式，加法和减法。我想出了如何创建一个按钮，将"添加按钮"链接到添加活动，但我似乎不知道如何创建第二个"减法按钮"，将链接到减法活动。下面是我的代码:

package com.example.kirky_000.madmath;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Context;
import android.content.Intent;

public class MainMenu extends ActionBarActivity {
    Button button;
    Button button2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_menu);
        addListenerOnButton();
}
    public void addListenerOnButton() {
        final Context context = this;
        button = (Button) findViewById(R.id.button);
        button2 = (Button) findViewById(R.id.button2);

        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                Intent intent = new Intent(context, Addition.class);
                startActivity(intent);
            }
            button2.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View arg0) {
                    Intent intent = new Intent(context, Subtraction.class);
                    startActivity(intent);
                }
        });
    }

Answer 1

你的代码只是有一些语法错误，这是解决每个给定的代码…

package com.example.kirky_000.madmath;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Context;
import android.content.Intent;

public class MainMenu extends ActionBarActivity {
    Button button;
    Button button2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_menu);
        addListenerOnButton();
}
    public void addListenerOnButton() {
        final Context context = this;
        button = (Button) findViewById(R.id.button);
        button2 = (Button) findViewById(R.id.button2);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                Intent intent = new Intent(context, Addition.class);
                startActivity(intent);
            }
});
            button2.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View arg0) {
                    Intent intent = new Intent(context, Subtraction.class);
                    startActivity(intent);
                }
        });
    }
}

Answer 2

第二个添加监听器的指令在第一个OnClickListener中。

因此侦听器不会添加到第二个按钮。你的代码应该像这样:

addListenerOnButton() {

    final Context context = this;
    button = (Button) findViewById(R.id.button);
    button2 = (Button) findViewById(R.id.button2);

    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            Intent intent = new Intent(context, Addition.class);
            startActivity(intent);
        }
    });
   button2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                Intent intent = new Intent(context, Subtraction.class);
                startActivity(intent);
            });
}

Answer 3

您需要为不同的按钮设置不同的单击侦听器。现在，你把第二个按钮的点击监听器放在第一个按钮的点击监听器中。像这样把它们分开…

button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            Intent intent = new Intent(context, Addition.class);
            startActivity(intent);
        }
    });
 button2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                Intent intent = new Intent(context, Subtraction.class);
                startActivity(intent);
            }
     )};

Answer 4

解决方案之前的一些要点(这些将有助于您进一步编码)

1. 在按钮声明后声明context，因此在Button button, button2后写入:

   final Context context;
   

2. 始终记住:始终在onCreate()中初始化对象方法。在OnCreate()之后setContentView(R.layout.activity_main_menu);, write:

   button = (Button) findViewById(R.id.button);
   button2 = (Button) findViewById(R.id.button2);
   //then define context
   context = MainMenu.this;
   //or context = getApplicationContext();
   

3. 现在addListenerOnButton()函数将是这样的(只需替换)addListenerOnButton()和以下代码):

   public void addListenerOnButton(){
   button.setOnClickListener(new OnClickListener() {
               @Override
               public void onClick(View arg0) {
                   // TODO Auto-generated method stub
                   Intent intent = new Intent(context, Addition.class);
                       startActivity(intent);
               }
           });
   button.setOnClickListener(new OnClickListener() {
               @Override
               public void onClick(View arg0) {
                   // TODO Auto-generated method stub
                   Intent intent = new Intent(context, Subtraction.class);
                   startActivity(intent);
               }
           });
   }
   

4. 现在你的代码中的wong是什么?

   你的onClick listener代码是错误的

享受编码:)(和android:))…

Answer 5

你甚至可以这样做

public  void  mainClickHandler(View v)
    {
     switch (v.getId()) {
         case R.id.button:
                Intent intent = new Intent(context, Addition.class);
                startActivity(intent);
          case R.id.button2:
                Intent intent = new Intent(context, Subtraction.class);
                    startActivity(intent);
    }

    }