android實(shí)現(xiàn)滑動(dòng)標(biāo)簽頁(yè)效果的代碼解析
實(shí)現(xiàn)效果:
實(shí)現(xiàn)功能:
ViewPager+Fragment實(shí)現(xiàn)加載界面 SQLite數(shù)據(jù)獲取并顯示到ListView上 ListView的item監(jiān)聽并攜帶數(shù)據(jù)跳轉(zhuǎn)到其他界面 使用SharedPreference存儲(chǔ)部分測(cè)試數(shù)據(jù)實(shí)現(xiàn)過(guò)程:
各方法和變量的作用請(qǐng)?jiān)斠姶a注釋。
listview的數(shù)據(jù)顯示請(qǐng)見Android Studio獲取SQLite數(shù)據(jù)并顯示到ListView上Fragment+ViewParger實(shí)現(xiàn)界面加載首先要?jiǎng)?chuàng)建兩個(gè)類并繼承Fragment,在viewpager中實(shí)現(xiàn)顯示時(shí)使用。
public class RiderInfo_Fragment extends Fragment { List<Map<String, Object>> listitem = new ArrayList<Map<String, Object>>(); //存儲(chǔ)數(shù)據(jù)的數(shù)組列表---里面的數(shù)據(jù)將顯示在ListView中 ListView listView = null; List<Info> infoList = new ArrayList<>(); //從SQLite中獲得的數(shù)據(jù)將存儲(chǔ)在改集合中-------info是bean類 @Override public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View view = inflater.inflate(R.layout.rider_info_fragment, null); listView = (ListView) view.findViewById(R.id.showRiderInfo); //綁定Listview getRiderHistoryInfoFromSQite(getActivity(), infoList); //該方法用于從SQLite中獲取數(shù)據(jù),參數(shù)二 infoList會(huì)存儲(chǔ)獲得數(shù)據(jù) getDataFromInfoList(); //將list中的數(shù)據(jù)添加到map集合中 initListData(); return view; } private void getDataFromInfoList() { for (int i = 0; i < infoList.size(); i++) { Map<String, Object> map = new HashMap<String, Object>(); map.put('name', infoList.get(i).getUsername()); map.put('address', 'f'); map.put('price', '444'); map.put('objectID', infoList.get(i).objectIds); listitem.add(map); } } private void initListData() { SimpleAdapter adapter = new SimpleAdapter(getActivity() , listitem , R.layout.rider_info_fragment_item , new String[]{'name', 'address', 'price', 'objectID'} , new int[]{R.id.time, R.id.address, R.id.price, R.id.objectID}); // 第一個(gè)參數(shù)是上下文對(duì)象 // 第二個(gè)是listitem------數(shù)據(jù)加載 // 第三個(gè)是指定每個(gè)列表項(xiàng)的布局文件 // 第四個(gè)是指定Map對(duì)象中定義的兩個(gè)鍵(這里通過(guò)字符串?dāng)?shù)組來(lái)指定) // 第五個(gè)是用于指定在布局文件中定義的id(也是用數(shù)組來(lái)指定) adapter.setViewBinder(new SimpleAdapter.ViewBinder() { //通過(guò)實(shí)現(xiàn)ViewBinder()這個(gè)接口,在里面定義數(shù)據(jù)和視圖的匹配關(guān)系 ---加載圖片 Bitmap類型(默認(rèn)是使用R.id.---) @Override public boolean setViewValue(View view, Object data, String textRepresentation) { if ((view instanceof ImageView) & (data instanceof Bitmap)) { ImageView iv = (ImageView) view; Bitmap bm = (Bitmap) data; iv.setImageBitmap(bm); return true; } return false; } }); listView.setAdapter(adapter); //監(jiān)聽item項(xiàng)并攜帶數(shù)據(jù)跳轉(zhuǎn)到另一個(gè)界面 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { ListView listView = (ListView) adapterView; HashMap<String, String> map = (HashMap<String, String>) listView.getItemAtPosition(i); Intent intent = new Intent(getActivity(), RiderInfoManager.class); Bundle bundle = new Bundle(); bundle.putString('objectid', map.get('objectID')); intent.putExtras(bundle); startActivity(intent); } }); }
另一個(gè)類的創(chuàng)建過(guò)程類似。3.創(chuàng)建 mainactivity.java用于設(shè)置在Viewpager中顯示Fragment
public class MainActivity extends AppCompatActivity implements View.OnClickListener {private ViewPager vp; CustomerInfo_Fragment customerInfo_fragment; RiderInfo_Fragment riderInfo_fragment; private List<Fragment> mFragmentList = new ArrayList<Fragment>(); FragmentAdapter mFragmentAdapter; TextView custome, rider; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); mFragmentAdapter = new FragmentAdapter(this.getSupportFragmentManager(), mFragmentList); vp.setOffscreenPageLimit(2);//ViewPager的緩存為2幀 vp.setAdapter(mFragmentAdapter); vp.setCurrentItem(0);//初始設(shè)置ViewPager選中第一幀 //ViewPager的監(jiān)聽事件 vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { /*此方法在頁(yè)面被選中時(shí)調(diào)用*/ //title.setText(titles[position]); changeTextColor(position); } @Override public void onPageScrollStateChanged(int state) { /*此方法是在狀態(tài)改變的時(shí)候調(diào)用,其中arg0這個(gè)參數(shù)有三種狀態(tài)(0,1,2)。 arg0==1的時(shí)辰默示正在滑動(dòng), arg0==2的時(shí)辰默示滑動(dòng)完畢了, arg0==0的時(shí)辰默示什么都沒做。*/ } }); } void initView() { custome = findViewById(R.id.customer); rider = findViewById(R.id.rider); custome.setOnClickListener(this); rider.setOnClickListener(this); vp = (ViewPager) findViewById(R.id.mainViewPager); customerInfo_fragment = new CustomerInfo_Fragment(); riderInfo_fragment = new RiderInfo_Fragment(); mFragmentList.add(customerInfo_fragment); mFragmentList.add(riderInfo_fragment); }@Override public void onClick(View view) { //用于判斷當(dāng)前為哪一個(gè)fragment int i = view.getId(); if (i == R.id.customer) { vp.setCurrentItem(0, true); } else if (i == R.id.rider) { vp.setCurrentItem(1, true); } } public class FragmentAdapter extends FragmentPagerAdapter { List<Fragment> fragmentList = new ArrayList<Fragment>(); public FragmentAdapter(android.support.v4.app.FragmentManager fm, List<Fragment> fragmentList) { super(fm); this.fragmentList = fragmentList; } @Override public Fragment getItem(int position) { return fragmentList.get(position); } @Override public int getCount() { return fragmentList.size(); } }
該方法用于具體執(zhí)行數(shù)據(jù)庫(kù)數(shù)據(jù)查詢
public static void getRiderHistoryInfoFromSQite(Activity activity, List<Info> infoList) { DBOpenHelper helper = new DBOpenHelper(activity, 'qianbao.db', null, 1); SQLiteDatabase db = helper.getWritableDatabase(); Cursor c = db.query('RiderHistoryInfo', null, null, null, null, null, null); if (c != null && c.getCount() >= 1) { while (c.moveToNext()) { //moveToNext是指向表中的下一行數(shù)據(jù) infoList.add(new Info(c.getString(c.getColumnIndex('userName')), c.getString(c.getColumnIndex('userPhone')), c.getString(c.getColumnIndex('price')), c.getString(c.getColumnIndex('address')), c.getString(c.getColumnIndex('createTime')), c.getString(c.getColumnIndex('objectId')),'')); } c.close(); db.close(); } }
實(shí)現(xiàn)過(guò)程中的主要代碼就是這么多,實(shí)現(xiàn)過(guò)程比較簡(jiǎn)單僅供參考。
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