如何在Android

Question

ModelClass

 public enum ModelObject {

        RED(R.string.red, R.layout.view_red),
        BLUE(R.string.blue, R.layout.view_blue);

        private int mTitleResId;
        private int mLayoutResId;

        ModelObject(int titleResId, int layoutResId) {
            mTitleResId = titleResId;
            mLayoutResId = layoutResId;
        }

        public int getTitleResId() {
            return mTitleResId;
        }

        public int getLayoutResId() {
            return mLayoutResId;
        }
    }

此活动

public class MainActivity extends AppCompatActivity {

    ViewPager viewPager;
    RadioGroup radioGroup;
    MyAdapter myAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewPager = (ViewPager)findViewById(R.id.viewpager1);
        radioGroup = (RadioGroup)findViewById(R.id.bottomRadioGroup);
        myAdapter = new MyAdapter(this);
        viewPager.setAdapter(myAdapter);
        RadioButton btn =(RadioButton)(radioGroup.getChildAt(0));
        btn.setChecked(true);
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
                if(checkedId == R.id.Radio1) {
                    viewPager.setCurrentItem(0);
                }else if(checkedId == R.id.Radio2){
                    viewPager.setCurrentItem(1);

                }

            }
        });

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

            }

            @Override
            public void onPageSelected(int position) {
                RadioButton btn =(RadioButton)(radioGroup.getChildAt(position));
                btn.setChecked(true);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }


    private class MyAdapter extends PagerAdapter{

        Context context;

        public MyAdapter(Context context) {
            super();
            this.context = context;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ModelObject modelObject = ModelObject.values()[position];
            LayoutInflater inflater = LayoutInflater.from(context);
            ViewGroup layout = (ViewGroup) inflater.inflate(modelObject.getLayoutResId(), container, false);
//            TextView textView=(TextView) itemView.findViewById(R.id.textView);
//            TextView textView9=(TextView) itemView.findViewById(R.id.textView9);
//            TextView textView3=(TextView) itemView.findViewById(R.id.textView3);
//            textView.setText("dsjhfkjsdhfjkdshfjkdshfjkdshfjkhdskjfhdskjr");
//            textView9.setText("sjkabdjkashdjksahdjksahdjksahdk");
//            textView3.setText("sadhasjkdhjkashdjkashdjksa");
            container.addView(layout);
            return layout;
        }

        @Override
        public void destroyItem(ViewGroup collection, int position, Object view) {
            collection.removeView((View) view);
        }

        @Override
        public int getCount() {
            return ModelObject.values().length;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            ModelObject customPagerEnum = ModelObject.values()[position];
            return context.getString(customPagerEnum.getTitleResId());
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.satti.radiogroupviewpager.MainActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager1"
        android:layout_width="match_parent"
        android:layout_height="200dp" />

    <RadioGroup
        android:id="@+id/bottomRadioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_gravity="center"
        android:gravity="center_vertical"
        android:layout_marginBottom="2dp">

        <RadioButton
            android:id="@+id/Radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingRight="5dp"/>

        <RadioButton
            android:id="@+id/Radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="false" />
    </RadioGroup>

</LinearLayout>

view_red.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true" />

</RelativeLayout>

view_blue.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/imageview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</RelativeLayout>

这是我使用此代码的代码，我能够设置视图，我正在尝试以编程方式在TextView中打印数据InstantiateItem方法，但我正在获取异常char null实例，并且应用程序崩溃了，请建议我如何在Textview中以编程方式设置数据view_red布局和view_red布局TextView的PagerAdapter。我编写了以编程方式打印数据的代码，但是它无法正常工作，所以我对代码进行了注释。