如果检查radiobutton，则显示监听器的结果

时间：2016-12-05 23:51:51

标签： java android android-studio

我需要在每个条件下在MonthsTxtView中显示24,36,60，如果用户检查相应的单选按钮时。例如，如果用户检查2年我需要在MonthsTxtview上显示24等等...下面是我的代码但是当我正在运行并且检查单选按钮告诉我“不幸的是，Carloan（app的名称）已停止”并关闭我的应用程序有什么建议吗？

XML CODE：

  <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.example.ioann_000.carloan.MainActivity"
        android:background="#E1E1E1"
        >
<TextView
        android:layout_width="60dp"
        android:layout_height="40dp"
        android:id="@+id/MonthsTxtView"
        android:layout_marginBottom="48dp"
        android:layout_above="@+id/Total2TxtView"
        android:layout_alignStart="@+id/Total2TxtView"
        android:clickable="false"
        android:background="@drawable/editetxt_second" />


         <RadioGroup
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="15dp"
        android:id="@+id/RadioGroup1"
        android:layout_below="@+id/LoadurationTextView"
        android:layout_alignStart="@+id/InsertTextView">
        <RadioButton android:id="@+id/radioyear2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="2 Years"
            android:onClick="onRadioButtonClicked"
            android:layout_alignTop="@+id/RadioGroup1"
            android:layout_toStartOf="@+id/RadioGroup1" />
        <RadioButton android:id="@+id/radioyear3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="3 Years"
            android:onClick="onRadioButtonClicked"/>
        <RadioButton android:id="@+id/radioyear5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="5 Years"
            android:onClick="onRadioButtonClicked"/>

    </RadioGroup>

JAVA CODE：

  package com.example.ioann_000.carloan;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.Selection;
import android.text.TextWatcher;
import android.util.Log;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

import java.text.NumberFormat;


public class MainActivity extends AppCompatActivity {
    private static final String TAG = "CARLOAN";
    private TextView MonthsTxtView;
    private TextView Total2TxtView;
    private RadioGroup RadioGroup1;
    private RadioButton selected;
    private int years2=24;
    private int years3=36;
    private int years5=60;
    private double MontlyI= 0;
    private double loan = 0;
    private RadioButton radioyear2;
    private RadioButton radioyear3;
    private RadioButton radioyear5;



    private static final NumberFormat currencyFormat = NumberFormat.getCurrencyInstance();
    private static final NumberFormat percentFormat = NumberFormat.getPercentInstance();




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        MonthsTxtView = (TextView) findViewById(R.id.MonthsTxtView);
        Total2TxtView = (TextView) findViewById(R.id.Total2TxtView);
        radioyear2 = (RadioButton) findViewById(R.id.radioyear2);
        radioyear3 = (RadioButton) findViewById(R.id.radioyear3);
        radioyear5 = (RadioButton) findViewById(R.id.radioyear5);
        EditText IREditText = (EditText) findViewById(R.id.IREditText);
        EditText AmountEditText = (EditText) findViewById(R.id.AmountEditText);
        EditText AFEditText = (EditText) findViewById(R.id.AFEditText);
        RadioBtn();
        Log.i(TAG, "onCreate: ");
    }


      private void RadioBtn () {

            RadioGroup selected= (RadioGroup) findViewById(R.id.RadioGroup1);
           selected.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
               @Override
               public void onCheckedChanged(RadioGroup radioGroup, int i) {
                   if(radioyear2.isChecked()) {

                       MonthsTxtView.setText("24");
                       Log.i(TAG, "onCheckedChanged: ");

               }
                   else if (radioyear3.isChecked()) {

                       MonthsTxtView.setText("36");
                       Log.i(TAG, "onCheckedChanged: ");

                   }
                   else

                       MonthsTxtView.setText("60");
                   Log.i(TAG, "onCheckedChanged: ");

               }

      });
          Log.i(TAG, "RadioBtn: ");
      }

















}

单击单选按钮时出现错误：

**12-07 01:31:00.863 4006-4006/com.example.ioann_000.carloan E/AndroidRuntime: FATAL EXCEPTION: main
                                                                             Process: com.example.ioann_000.carloan, PID: 4006
                                                                             java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.widget.RadioButton.isChecked()' on a null object reference
                                                                                 at com.example.ioann_000.carloan.MainActivity$1.onCheckedChanged(MainActivity.java:64)
                                                                                 at android.widget.RadioGroup.setCheckedId(RadioGroup.java:174)
                                                                                 at android.widget.RadioGroup.access$600(RadioGroup.java:54)
                                                                                 at android.widget.RadioGroup$CheckedStateTracker.onCheckedChanged(RadioGroup.java:358)
                                                                                 at android.widget.CompoundButton.setChecked(CompoundButton.java:157)
                                                                                 at android.widget.CompoundButton.toggle(CompoundButton.java:113)
                                                                                 at android.widget.RadioButton.toggle(RadioButton.java:78)
                                                                                 at android.widget.CompoundButton.performClick(CompoundButton.java:118)
                                                                                 at android.view.View$PerformClick.run(View.java:19866)
                                                                                 at android.os.Handler.handleCallback(Handler.java:739)
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                 at android.os.Looper.loop(Looper.java:135)
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:5254)
                                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                                 at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
**

错误2：E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.ioann_000.carloan, PID: 11445 java.lang.IllegalStateException: Could not find method onRadioButtonClicked(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatRadioButton with id 'radioyear2' at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284) at android.view.View.performClick(View.java:4780) at android.widget.CompoundButton.performClick(CompoundButton.java:120) at android.view.View$PerformClick.run(View.java:19866) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) Disconnected from the target VM, address: 'localhost:8625', transport: 'socket'

3 个答案:

答案 0 :(得分：0)

您的一个RadioButton位于RadioGroup标记之外。先检查一下。此致！

你能做的另一件事就是吼叫：

int checkedRadioButtonId = selected.getCheckedRadioButtonId();
if (checkedRadioButtonId == -1) {
    // No item selected
}
else{
    switch(checkedRadioButtonId){
       case R.id.radioyear2:
        // Do something cool here
       break;
       case R.id.radioyear3:
        // Do something cool here
       break;
       case R.id.radioyear5:
        // Do something cool here
       break;
    }
}

而且，您错过了使用findViewById初始化MonthsTxtView ...

答案 1 :(得分：0)

看起来您没有初始化单选按钮。您需要使用findViewById将它们绑定到变量。如果您发布了堆栈跟踪

，它也会有所帮助

在onCreate 

radioyear2 = (RadioButton) findViewById(R.id.radioyear2);
radioyear3 = (RadioButton) findViewById(R.id.radioyear3);
radioyear5 = (RadioButton) findViewById(R.id.radioyear5);

MonthsTxtView = (TextView) findViewById(R.id.MonthsTxtView);

答案 2 :(得分：0)

最后我必须做这个改变：

 `public void onRadioButtonClicked(View view) {
        // Is the button now checked?
        boolean checked = ((RadioButton) view).isChecked();

        // Check which radio button was clicked
        switch(view.getId()) {
            case R.id.radioyear2:
                if (checked)
                    MonthsTxtView.setText("24");
                Log.i(TAG, "onRadioButtonClicked: ");
                    break;
            case R.id.radioyear3:
                if (checked)
                    MonthsTxtView.setText("36");
                Log.i(TAG, "onRadioButtonClicked: ");
                    break;
            case R.id.radioyear5:
                if (checked)
                    MonthsTxtView.setText("60");
                Log.i(TAG, "onRadioButtonClicked: ");
                break;
        }
    }
      }`

感谢@David Rawson

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