Button按钮换脸viewpager滑动+点击监听 _____部分重点代码

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public class MainActivity extends AppCompatActivity {    ArrayList<Fragment> fraarr = new ArrayList<>();    ArrayList<Button> btarr = new ArrayList<>();    private ViewPager vp;    private Button bt1;    private DrawerLayout drawerlayout;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        vp = (ViewPager) findViewById(R.id.vp);        drawerlayout = (DrawerLayout) findViewById(R.id.drawerlayout);        Button bt1 = (Button) findViewById(R.id.bt1);        Button bt2 = (Button) findViewById(R.id.bt2);        Button bt3 = (Button) findViewById(R.id.bt3);        Button bt4 = (Button) findViewById(R.id.bt4);        btarr.add(bt1);        btarr.add(bt2);        btarr.add(bt3);        btarr.add(bt4);        vpshuju();        vpspq vpspq = new vpspq(getSupportFragmentManager());        vp.setAdapter(vpspq);//点击变色

 for(int y=0;y<btarr.size();y++){            Button button = btarr.get(y);            button.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    //获取点击ID                    int id = view.getId();                    Log.e("chen", "onClick: ------"+id );                    vp.setCurrentItem(id%btarr.size());                }            });
}

//滑动变色        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                for(int i=0;i<btarr.size();i++){                    if(i==position%btarr.size()){                        Button button = btarr.get(i);                        button.setTextColor(Color.RED);                    }else{                        btarr.get(i).setTextColor(Color.BLACK);                    }                }            }            @Override            public void onPageScrollStateChanged(int state) {            }        });    }    class vpspq extends FragmentPagerAdapter{        public vpspq(FragmentManager fm) {            super(fm);        }        @Override        public Fragment getItem(int position) {            return fraarr.get(position);        }        @Override        public int getCount() {            return fraarr.size();        }    }

//自己新建frament充当viewpager的数据源    public void vpshuju(){        yi yi = new yi();        er er = new er();        san san = new san();        si si = new si();        viewp viewp = new viewp();        fraarr.add(yi);        fraarr.add(er);        fraarr.add(san);        fraarr.add(viewp);    }}

//布局文件XML

<LinearLayout    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical">    <android.support.v4.view.ViewPager        android:id="@+id/vp"        android:layout_width="wrap_content"        android:layout_height="400dp">    </android.support.v4.view.ViewPager>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <Button            android:text="你好啊"            android:textColor="#cc0000"            android:id="@+id/bt1"            android:layout_weight="1"            android:layout_width="0dp"            android:layout_height="wrap_content" />        <Button            android:text="我好啊"            android:id="@+id/bt2"            android:layout_weight="1"            android:layout_width="0dp"            android:layout_height="wrap_content" />        <Button            android:text="大家好"            android:id="@+id/bt3"            android:layout_weight="1"            android:layout_width="0dp"            android:layout_height="wrap_content" />        <Button            android:text="好好好"            android:id="@+id/bt4"            android:layout_weight="1"            android:layout_width="0dp"            android:layout_height="wrap_content" />    </LinearLayout>

//自己新建的Framnet   一个类一个布局文件进行关联

//yi

public class yi extends Fragment{    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        View inflate = View.inflate(getActivity(), R.layout.one, null);        return inflate;    }}
//yi的布局文件  one

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:text="时的快感就能发"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

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