Question

我回答的最后一个问题确实对我有帮助。谢谢你们。但现在我收到了一个新的错误。这是我的代码：

import android.app.Activity;
import android.os.Bundle;
import android.app.AlertDialog;
import android.view.View;

public class Trial extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        View b1 = findViewById(R.id.button1);
        b1.setOnClickListener(yourListener);  
        View b2 = findViewById(R.id.button2);
        b1.setOnClickListener(yourListener);  
    }
    View.OnClickListener yourListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (v == button1) {
                new AlertDialog.Builder(v.getContext())
                        .setTitle("Paracettamol")
                        .setMessage(
                                "This medicine is generally used to cure Fever")
                        .setNeutralButton("OK", null).show();
            } else if (v == button2) {
                new AlertDialog.Builder(v.getContext())
                        .setTitle("sertraline")
                        .setMessage(
                                "This medicine is generally used to cure Head aches")
                        .setNeutralButton("OK", null).show();
            }


        }
    };
}

首先，我想告诉你两件事： 1）在最后一行，我曾经得到一个错误：“语法错误，插入”;“完成FieldDeclaration。 2）我插入“;”，并保存它，然后我得到一个错误的if，如果行“button1无法解析为变量”和“button2不能分别解析为变量”。

我的main.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
<Button android:id="@+id/button1" 
    android:layout_height="wrap_content" 
    android:layout_width="fill_parent" 
    android:text="@string/s1" 
    android:onClick="b1"/>
<Button android:id="@+id/button2" 
    android:layout_height="wrap_content" 
    android:text="Belladona" 
    android:layout_width="fill_parent" 
    android:onClick="b2"/>

</LinearLayout>

任何人都可以帮助我。提前致谢。

Answer 1

好吧，button1和button2不存在。您需要在R.id.之前加上{{1}}。

Answer 2

只需使用此条件：

if (v.getId() == R.id.button1) { /* ... */ }

如果您有更多控件，您甚至可以将switch用于视图ID。

Answer 3

这是 java 文件

    import android.app.Activity;
    import android.os.Bundle;
    import android.app.AlertDialog;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;

public class Trial extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button b1 = findViewById(R.id.button1);
        Button b2 = findViewById(R.id.button2);
        b1.setOnClickListener(this);
        b2.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        int id = v.getId();
        if (id == R.id.button1) {
            new AlertDialog.Builder(v.getContext())
                    .setTitle("Paracettamol")
                    .setMessage("This medicine is generally used to cure Fever")
                    .setNeutralButton("OK", null).show();
        } else if (id == R.id.button2) {
            new AlertDialog.Builder(v.getContext())
                    .setTitle("sertraline")
                    .setMessage(
                            "This medicine is generally used to cure Head aches")
                    .setNeutralButton("OK", null).show();
        }

    }
}

这是 XML 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
<Button android:id="@+id/button1" 
    android:layout_height="wrap_content" 
    android:layout_width="fill_parent" 
    android:text="@string/s1" 
    />
<Button android:id="@+id/button2" 
    android:layout_height="wrap_content" 
    android:text="Belladona" 
    android:layout_width="fill_parent" 
    />

</LinearLayout>

我已经编辑了你的两个文件.. 希望它会对你有所帮助。

Answer 4

您可以使用v == button1这样的方法

，而不是编写始终返回false的equals，因为它们都是不同的对象。

if(v.equals(b1))
{
    ...................
}
else if(v.equals(b2))
{
    ................
}

Answer 5

你可以尝试这个：

public class Trial extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button b1 = (Button)findViewById(R.id.button1); 
        Button b2 = (Button)findViewById(R.id.button2);t

        b1.setOnClickListener(new OnClickListener(){
            public void onClick(View v) {
            if(b1.getText().equals("button1"))   //No need to check this condition 
            {
            //Your logic
            }
            }
    });


        b2.setOnClickListener(new OnClickListener(){
            public void onClick(View v) {
            if(b2.getText().equals("button2"))   //No need to check this condition 
            {
            //Your logic
            }
            }
    });

}

Answer 6

尝试使用此代码来解决您的问题

 public class ButtonCheck extends Activity {
   /** Called when the activity is first created. */
 View b1,b2;
 @Override
     public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

     b1 = (View)findViewById(R.id.button1);
    b1.setOnClickListener(yourListener);  
  b2 =(View) findViewById(R.id.button2);
    b2.setOnClickListener(yourListener); 

}
View.OnClickListener yourListener=new OnClickListener() {

    @Override
    public void onClick(View v) {
        if (v ==b1) {
            new AlertDialog.Builder(v.getContext())
                    .setTitle("Paracettamol")
                    .setMessage(
                            "This medicine is generally used to cure Fever")
                    .setNeutralButton("OK", null).show();
        } else if (v ==b2) {
            new AlertDialog.Builder(v.getContext())
                    .setTitle("sertraline")
                    .setMessage(
                            "This medicine is generally used to cure Head aches")
                    .setNeutralButton("OK", null).show();
        }


    }
};
}

如果你得到解决就问好，请检查并投票。

按钮名称无法解析为变量

6 个答案: