SharedPreferences

package com.example.lenovo.newsmouthmoni01;

import android.content.Intent;
import android.content.SharedPreferences;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Button btnInsert;
    private ViewPager vp;
    private SharedPreferences sp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        btnInsert = findViewById(R.id.btn_insert);
        vp = findViewById(R.id.vp);

        sp = getSharedPreferences("config",MODE_PRIVATE);
        if (sp.getBoolean("isFirst",false)){
            Intent intent = new Intent(MainActivity.this,ShowActivity.class);
            startActivity(intent);
        }
          //添加图片
        final List<Integer> integerList = new ArrayList<>();
        integerList.add(R.drawable.abc);
        integerList.add(R.drawable.bb);
        integerList.add(R.drawable.bc);

             //滑动
            vp.setAdapter(new PagerAdapter() {
                @Override
                public int getCount() {
                    return integerList.size();
                }

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

                @NonNull
                @Override
                public Object instantiateItem(@NonNull ViewGroup container, int position) {
                    ImageView imageView = new ImageView(MainActivity.this);
                    imageView.setImageResource(integerList.get(position));
                    container.addView(imageView);

                    return imageView;
                }

                @Override
                public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {


                    container.removeView((View) object);
                }
            });

                  //点击事件
            btnInsert.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                      sp.edit().putBoolean("isFirst",true).commit();
                      Intent intent = new Intent(MainActivity.this,ShowActivity.class);
                      startActivity(intent);

                }
            });

    }
}

 

 

// Layout

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

  <Button
      android:id="@+id/btn_insert"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"

      android:text="点击进入"/>

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

</LinearLayout>