viewpager怎么在android中使用?相信很多沒有經驗的人對此束手無策,為此本文總結了問題出現的原因和解決方法,通過這篇文章希望你能解決這個問題。

創(chuàng)新互聯企業(yè)建站,十多年網站建設經驗,專注于網站建設技術,精于網頁設計,有多年建站和網站代運營經驗,設計師為客戶打造網絡企業(yè)風格,提供周到的建站售前咨詢和貼心的售后服務。對于網站設計制作、做網站中不同領域進行深入了解和探索,創(chuàng)新互聯在網站建設中充分了解客戶行業(yè)的需求,以靈動的思維在網頁中充分展現,通過對客戶行業(yè)精準市場調研,為客戶提供的解決方案。
(1)簡單寫一個主界面的布局activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:clipToPadding="true" android:fitsSystemWindows="true" android:background="@color/bg_color"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/bag_gray" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="36dp" android:background="@android:color/white" android:orientation="horizontal" android:weightSum="3"> <TextView android:id="@+id/tab1_tv" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" android:gravity="center" android:text="商品" android:textColor="@color/title_bag" android:textSize="18sp" /> <TextView android:id="@+id/tab2_tv" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" android:gravity="center" android:text="評價" android:textColor="@color/text_color_context" android:textSize="18sp" /> <TextView android:id="@+id/tab3_tv" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" android:gravity="center" android:text="詳情" android:textColor="@color/text_color_context" android:textSize="18sp" /> </LinearLayout> <View android:layout_width="match_parent" android:layout_height="0.5dp" android:background="@color/text_color_context" /> <View android:id="@+id/cursor" android:layout_width="50dp" android:layout_height="2dp" android:layout_marginLeft="40dp" android:layout_marginTop="0dip" android:background="@color/title_bag" /> <android.support.v4.view.ViewPager android:id="@+id/thire_vp" android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout> </LinearLayout>
(2)設置viewpager的適配器:FragmentAdapter
public class FragmentAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> list;
FragmentManager fm;
public FragmentAdapter(FragmentManager fm, ArrayList<Fragment> list){
super(fm);
this.fm = fm;
this.list = list;
}
@Override
public Fragment getItem(int position) {
return list.get(position);
}
@Override
public int getCount() {
return list.size();
}
}(3)然后設置三個fragment,因為有三個選項卡,所以我們新建三個fragment,分別是OneFragment、TwoFragment 、ThreeFragment ,布局的話也需要新建三個,跟fragment一一對應,因為布局過于簡單,這里就不寫了,簡單寫一點fragment的代碼吧
public class OneFragment extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_one,null);
return view;
}
}(4)在MainActivity中,設置fragment的適配器,設置顯示內容,并且做viewpager的事件監(jiān)聽
public class MainActivity extends FragmentActivity implements ViewPager.OnPageChangeListener,View.OnClickListener{
private TextView tab1Tv;
private TextView tab2Tv;
private TextView tab3Tv;
private View cursor;
private ViewPager thirdVp;
private ArrayList<Fragment> fragmentlist;
private int offset = 0;
private int screenWidth = 0;
private int screenl_3;
private LinearLayout.LayoutParams lp;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product);
//綁定控件
tab1Tv = (TextView)findViewById(R.id.tab1_tv);
tab2Tv = (TextView)findViewById(R.id.tab2_tv);
tab3Tv = (TextView)findViewById(R.id.tab3_tv);
cursor = (View) findViewById(R.id.cursor);
thirdVp = (ViewPager) findViewById(R.id.thire_vp);
//獲取屏幕寬度
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
screenWidth = dm.widthPixels;
screenl_3 = screenWidth/3; //裁剪3分之1
lp = (LinearLayout.LayoutParams)cursor.getLayoutParams();
fragmentlist = new ArrayList<>();
fragmentlist.add(new OneFragment());
fragmentlist.add(new TwoFragment());
fragmentlist.add(new ThreeFragment());
thirdVp.setAdapter(new FragmentAdapter(getSupportFragmentManager(),fragmentlist));
thirdVp.setCurrentItem(0);
thirdVp.setOffscreenPageLimit(2);
thirdVp.setOnPageChangeListener(this);
tab1Tv.setOnClickListener(this);
tab2Tv.setOnClickListener(this);
tab3Tv.setOnClickListener(this);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
offset = (screenl_3-cursor.getLayoutParams().width)/2;
Log.d("TAG", "111----"+position + "--" + positionOffset + "--"
+ positionOffsetPixels);
final float scale = getResources().getDisplayMetrics().density;
if (position == 0){
lp.leftMargin = (int)(positionOffsetPixels/3)+offset;
}else if(position ==1){
lp.leftMargin = (int)(positionOffsetPixels/3)+screenl_3+offset;
}
cursor.setLayoutParams(lp);
upTextcolor(position);
}
private void upTextcolor(int position){
if (position==0){
tab1Tv.setTextColor(getResources().getColor(R.color.title_bag));
tab2Tv.setTextColor(getResources().getColor(R.color.text_color_context));
tab3Tv.setTextColor(getResources().getColor(R.color.text_color_context));
}else if(position==1){
tab1Tv.setTextColor(getResources().getColor(R.color.text_color_context));
tab2Tv.setTextColor(getResources().getColor(R.color.title_bag));
tab3Tv.setTextColor(getResources().getColor(R.color.text_color_context));
}else if(position==2){
tab1Tv.setTextColor(getResources().getColor(R.color.text_color_context));
tab2Tv.setTextColor(getResources().getColor(R.color.text_color_context));
tab3Tv.setTextColor(getResources().getColor(R.color.title_bag));
}
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.tab1_tv:
thirdVp.setCurrentItem(0);
break;
case R.id.tab2_tv:
thirdVp.setCurrentItem(1);
break;
case R.id.tab3_tv:
thirdVp.setCurrentItem(2);
break;
}
}
}看完上述內容,你們掌握viewpager怎么在android中使用的方法了嗎?如果還想學到更多技能或想了解更多相關內容,歡迎關注創(chuàng)新互聯行業(yè)資訊頻道,感謝各位的閱讀!
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