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

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) {

}

4000
@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);
}
}

<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@Overridepublic View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {View inflate = View.inflate(getActivity(), R.layout.one, null);return inflate;}}

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