Question

我是这里的新手和java。我正在开发一个带有单选按钮的Android应用程序，用于计算学生的SGPA。每个科目都拥有自己的学分，这些学分会被相应的年级倍增，并且在加入主题的所有产品后，总和除以总学分...

到目前为止，我已经正确地完成了xml代码，但我仍然坚持使用java主要活动......我只需要一个按钮或主题的示例，我只需要自己做...我想要使用开关盒首先检查单击哪个单选按钮，然后进行相应的计算。

XML CODE

<TextView
        android:id="@+id/maths"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#F44336"
        android:text="MATHEMATICS"
        android:textAlignment="center"
        android:textAllCaps="true"
        android:textAppearance="?android:textAppearanceLarge"
        android:textStyle="bold" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#F44336"
        android:orientation="horizontal">

        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="7"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/Omaths"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="O"
                android:onClick="onRadioButtonClicked"/>

            <RadioButton
                android:id="@+id/Aplusmaths"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="A+"
                android:onClick="onRadioButtonClicked"/>

            <RadioButton
                android:id="@+id/Amaths"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="A"
                android:onClick="onRadioButtonClicked"/>

            <RadioButton
                android:id="@+id/Bplusmaths"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="B+"
                android:onClick="onRadioButtonClicked"/>

            <RadioButton
                android:id="@+id/Bmaths"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="B"
                android:onClick="onRadioButtonClicked"/>

            <RadioButton
                android:id="@+id/Cmaths"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="C"
                android:onClick="onRadioButtonClicked"/>

            <RadioButton
                android:id="@+id/Pmaths"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="P"
                android:onClick="onRadioButtonClicked"/>
        </RadioGroup>
    </LinearLayout>

和JAVA主要活动代码

package droidmentor.bnv_with_viewpager;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.RadioButton;
import android.widget.TextView;

import droidmentor.bnv_with_viewpager.Fragment.CallsFragment;
import droidmentor.bnv_with_viewpager.Fragment.ChatFragment;
import droidmentor.bnv_with_viewpager.Fragment.ContactsFragment;
import static droidmentor.bnv_with_viewpager.R.id.Amaths;
import static droidmentor.bnv_with_viewpager.R.id.Bmaths;
import static droidmentor.bnv_with_viewpager.R.id.Bplusmaths;
import static droidmentor.bnv_with_viewpager.R.id.Cmaths;
import static droidmentor.bnv_with_viewpager.R.id.Pmaths;

public class MainActivity extends AppCompatActivity {


    BottomNavigationView bottomNavigationView;

    //This is our viewPager
    private ViewPager viewPager;


    //Fragments

    ChatFragment chatFragment;
    CallsFragment callsFragment;
    ContactsFragment contactsFragment;
    MenuItem prevMenuItem;

    //Instance Variables For Each Subject

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        //Initializing viewPager
        viewPager = (ViewPager) findViewById(R.id.viewpager);

        //Initializing the bottomNavigationView
        bottomNavigationView = (BottomNavigationView)findViewById(R.id.bottom_navigation);

        bottomNavigationView.setOnNavigationItemSelectedListener(
                new BottomNavigationView.OnNavigationItemSelectedListener() {
                    @Override
                    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                        switch (item.getItemId()) {
                            case R.id.action_call:
                                viewPager.setCurrentItem(0);
                                break;
                            case R.id.action_chat:
                                viewPager.setCurrentItem(1);
                                break;
                            case R.id.action_contact:
                                viewPager.setCurrentItem(2);
                                break;
                        }
                        return false;
                    }
                });

        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                if (prevMenuItem != null) {
                    prevMenuItem.setChecked(false);
                }
                else
                {
                    bottomNavigationView.getMenu().getItem(0).setChecked(false);
                }
                Log.d("page", "onPageSelected: "+position);
                bottomNavigationView.getMenu().getItem(position).setChecked(true);
                prevMenuItem = bottomNavigationView.getMenu().getItem(position);

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

       /*  //Disable ViewPager Swipe

       viewPager.setOnTouchListener(new View.OnTouchListener()
        {
            @Override
            public boolean onTouch(View v, MotionEvent event)
            {
                return true;
            }
        });

        */

        setupViewPager(viewPager);
    }
    //This method is called when button is pressed
    public void calculate(View view) {
        display(9);
    }

    //This method returns the SGPA
    private void display(int number) {
        TextView sgpa = (TextView) findViewById(R.id.sgpa);
        sgpa.setText("" + number);
    }

    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        callsFragment=new CallsFragment();
        chatFragment=new ChatFragment();
        contactsFragment=new ContactsFragment();
        adapter.addFragment(callsFragment);
        adapter.addFragment(chatFragment);
        adapter.addFragment(contactsFragment);
        viewPager.setAdapter(adapter);
    }
}

我知道我可以使用带编辑文本的用户输入法，但我必须使用单选按钮... :)

Answer 1

尝试执行此操作以获取选中按钮：

int radioButtonID = radioButtonGroup.getCheckedRadioButtonId();
View radioButton = radioButtonGroup.findViewById(radioButtonID);
int idx = radioButtonGroup.indexOfChild(radioButton);

请注意，如果您在radioGroup中使用 textview 或其他视图不等于 radiobutton ，则会得到错误的索引。

获取所选按钮的文本：

RadioButton r = (RadioButton)  radioButtonGroup.getChildAt(idx);
String selectedtext = r.getText().toString();

使用单选按钮切换机箱

1 个答案: