Question

我正在制作一个计算器，我添加了一个新的运算符1 / x，它反转了数字。当用户从微调器中选择此运算符时，应立即禁用第二个edittext但我没有得到如何执行此操作。请帮我！这是我的代码 -

activity_main.xml中

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

<EditText

    android:id="@+id/edtNumber1"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:inputType="numberDecimal"

    android:hint="@string/hntNumber1"
/>

<Spinner

    android:id="@+id/sprOperator"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:entries="@array/sprItems"
/>

<EditText

    android:id="@+id/edtNumber2"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:inputType="numberDecimal"

    android:hint="@string/hntNumber2"
/>
<Button
    android:id="@+id/btnResult"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/lblBtnResult"
/>
<EditText
    android:id="@+id/edtResult"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:inputType="numberDecimal"

/>

<Button
    android:id="@+id/buttonAlert"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="EXIT"
     />

</LinearLayout>

MainActivity.java

package com.example.my_cal;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends Activity {

final Context context = this;

private Button button;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);


    // Defining onclick listener for finding the result

    OnClickListener listener = new OnClickListener() {

       @Override

       public void onClick(View v) {

            Spinner spr = (Spinner) findViewById(R.id.sprOperator);

            EditText edtNumber1 = ( EditText) findViewById(R.id.edtNumber1);

            EditText edtNumber2 = ( EditText) findViewById(R.id.edtNumber2);

            EditText edtResult = ( EditText) findViewById(R.id.edtResult);

            String selectedItem = (String) spr.getSelectedItem();

            if(selectedItem.trim().equals("+")){

                float result = Float.parseFloat(edtNumber1.getText().toString())  + Float.parseFloat(edtNumber2.getText().toString());

edtResult.setText(Float.toString(result));

            }else if(selectedItem.trim().equals("-")){

                float result = Float.parseFloat(edtNumber1.getText().toString())  - Float.parseFloat(edtNumber2.getText().toString());

                edtResult.setText(Float.toString(result));

            }else if(selectedItem.trim().equals("x")){

                float result = Float.parseFloat(edtNumber1.getText().toString())  * Float.parseFloat(edtNumber2.getText().toString());

                edtResult.setText(Float.toString(result));

            }else if(selectedItem.trim().equals("/")){

                float result = Float.parseFloat(edtNumber1.getText().toString())  / Float.parseFloat(edtNumber2.getText().toString());

                edtResult.setText(Float.toString(result));

            }

            else if(selectedItem.trim().equals("1/x")){

float result = 1  / Float.parseFloat(edtNumber1.getText().toString());

                edtResult.setText(Float.toString(result));
            }
       }

    };

    button = (Button) findViewById(R.id.buttonAlert);

    // add button listener

    button.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
            context);

        // set title
        alertDialogBuilder.setTitle("Your Title");

        // set dialog message
        alertDialogBuilder

            .setMessage("Click yes to exit!")

            .setCancelable(false)

            .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                    // if this button is clicked, close
                    // current activity
                    MainActivity.this.finish();
                }
              })
            .setNegativeButton("No",new

DialogInterface.OnClickListener（）{

                public void onClick(DialogInterface dialog,int id) {
                    // if this button is clicked, just close
                    // the dialog box and do nothing
                    dialog.cancel();
                }
            });

            // create alert dialog

            AlertDialog alertDialog = alertDialogBuilder.create();

            // show it
            alertDialog.show();
        }
    });
    button = (Button) findViewById(R.id.buttonAlert);

    // add button listener
    button.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
            context);

        // set title
        alertDialogBuilder.setTitle("EXIT");

        // set dialog message
        alertDialogBuilder
            .setMessage("Are you sure want to exit ?")
            .setCancelable(false)
            .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                    // if this button is clicked, close
                    // current activity
                    MainActivity.this.finish();
                }
              })
            .setNegativeButton("No",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                    // if this button is clicked, just close
                    // the dialog box and do nothing
                    dialog.cancel();
                }
            });

            // create alert dialog
            AlertDialog alertDialog = alertDialogBuilder.create();

            // show it
            alertDialog.show();
        }
    });

    // Getting reference of the button btnResult
    Button btn = (Button) findViewById(R.id.btnResult);

    // Setting onclick listener
    btn.setOnClickListener(listener);

}
}

Answer 1

我不太明白你的意思，但你可以通过

隐藏编辑文本

 edtNumber2.setVisibility(View.GONE);

或

edtNumber2.setVisibility(View.INVISIBLE);

并再次显示

edtNumber2.setVisibility(View.VISIBLE);

Answer 2

使用此edtNumber2.setEnabled(false);

在你的情况下

else if(selectedItem.trim().equals("1/x")){

edtNumber2.setEnabled(false);

float result = 1  / Float.parseFloat(edtNumber1.getText().toString());

                edtResult.setText(Float.toString(result));
            }

修改

我重写了部分代码以实现您想要的目标

public class MainActivity extends Activity { final Context context = this; private Button button; private EditText edtNumber1; private EditText edtNumber2; private Spinner spr; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); spr = (Spinner) findViewById(R.id.sprOperator); edtNumber1 = ( EditText) findViewById(R.id.edtNumber1); edtNumber2 = ( EditText) findViewById(R.id.edtNumber2); edtResult = ( EditText) findViewById(R.id.edtResult); spr.setOnItemSelectedListener( new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { String selectedItem = parent.getItemAtPosition(position).toString(); if(selectedItem.trim().equals("1/x")){ edtNumber2.setEnabled(false); }else{ edtNumber2.setEnabled(true); } } public void onNothingSelected(AdapterView<?> parent) { } }); // Defining onclick listener for finding the result OnClickListener listener = new OnClickListener() { @Override public void onClick(View v) { String selectedItem = (String) spr.getSelectedItem(); if(selectedItem.trim().equals("+")){ float result = Float.parseFloat(edtNumber1.getText().toString()) + Float.parseFloat(edtNumber2.getText().toString()); edtResult.setText(Float.toString(result)); }else if(selectedItem.trim().equals("-")){ float result = Float.parseFloat(edtNumber1.getText().toString()) - Float.parseFloat(edtNumber2.getText().toString()); edtResult.setText(Float.toString(result)); }else if(selectedItem.trim().equals("x")){ float result = Float.parseFloat(edtNumber1.getText().toString()) * Float.parseFloat(edtNumber2.getText().toString()); edtResult.setText(Float.toString(result)); }else if(selectedItem.trim().equals("/")){ float result = Float.parseFloat(edtNumber1.getText().toString()) / Float.parseFloat(edtNumber2.getText().toString()); edtResult.setText(Float.toString(result)); } else if(selectedItem.trim().equals("1/x")){ float result = 1 / Float.parseFloat(edtNumber1.getText().toString()); edtResult.setText(Float.toString(result)); } } }; . . . .

希望这有助于你。

Answer 3

这样做，

    EditText edit = (EditText) findViewById(R.id.EditText01);
    edit.setEnabled(false);
    edit.setInputType(InputType.TYPE_NULL);
    edit.setFocusable(false);

当选择任何其他选项时，

edit.setEnabled(true);
edit.setInputType(InputType.TYPE_CLASS_TEXT);
edit.setFocusable(true);

立即选择微调器后禁用编辑文本

3 个答案: