实现效果:
实现功能:
- ViewPager+Fragment实现加载界面
- SQLite数据获取并显示到ListView上
- ListView的item监听并携带数据跳转到其他界面
- 使用SharedPreference存储部分测试数据
实现过程:
各方法和变量的作用请详见代码注释。
listview的数据显示请见Android Studio获取SQLite数据并显示到ListView上Fragment+ViewParger实现界面加载
首先要创建两个类并继承Fragment,在viewpager中实现显示时使用。
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public class RiderInfo_Fragment extends Fragment { List<Map<String, Object>> listitem = new ArrayList<Map<String, Object>>(); //存储数据的数组列表---里面的数据将显示在ListView中 ListView listView = null ; List<Info> infoList = new ArrayList<>(); //从SQLite中获得的数据将存储在改集合中-------info是bean类 @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); //绑定Listview getRiderHistoryInfoFromSQite(getActivity(), infoList); //该方法用于从SQLite中获取数据,参数二 infoList会存储获得数据 getDataFromInfoList(); //将list中的数据添加到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}); // 第一个参数是上下文对象 // 第二个是listitem------数据加载 // 第三个是指定每个列表项的布局文件 // 第四个是指定Map对象中定义的两个键(这里通过字符串数组来指定) // 第五个是用于指定在布局文件中定义的id(也是用数组来指定) adapter.setViewBinder( new SimpleAdapter.ViewBinder() { //通过实现ViewBinder()这个接口,在里面定义数据和视图的匹配关系 ---加载图片 Bitmap类型(默认是使用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); //监听item项并携带数据跳转到另一个界面 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); } }); } |
另一个类的创建过程类似。
3.创建 mainactivity.java用于设置在Viewpager中显示Fragment
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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的缓存为2帧 vp.setAdapter(mFragmentAdapter); vp.setCurrentItem( 0 ); //初始设置ViewPager选中第一帧 //ViewPager的监听事件 vp.setOnPageChangeListener( new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled( int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected( int position) { /*此方法在页面被选中时调用*/ //title.setText(titles[position]); changeTextColor(position); } @Override public void onPageScrollStateChanged( int state) { /*此方法是在状态改变的时候调用,其中arg0这个参数有三种状态(0,1,2)。 arg0==1的时辰默示正在滑动, arg0==2的时辰默示滑动完毕了, arg0==0的时辰默示什么都没做。*/ } }); } 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) { //用于判断当前为哪一个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(); } } |
该方法用于具体执行数据库数据查询
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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数据 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(); } } |
实现过程中的主要代码就是这么多,实现过程比较简单仅供参考。
完整Demo下载(免费)
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原文链接:https://blog.csdn.net/liyue_199609130/article/details/105795784