編輯:關於Android編程
在App開發中,對於信息的獲取與演示,不可能全部將其獲取與演示,為了在用戶使用中,給予用戶以友好、方便的用戶體驗,以滑動、下拉的效果動態加載數據的要求就會出現。為此,該效果功能就需要應用到所需要的展示頁面中。
第三步:將所需要的圖片文件放入相應的文件夾下面,所用的圖片文件有:srings.xml SampleDemo Settings 滑動刷新 釋放刷新 加載中 點擊刷新
import java.util.LinkedList; import com.example.sampledemo.view.PullToRefreshListView; import android.os.AsyncTask; import android.widget.BaseAdapter; public class PullTask extends AsyncTask{ private PullToRefreshListView pullToRefreshListView; //實現下拉刷新與上拉加載的ListView private int pullState; //記錄判斷,上拉與下拉動作 private BaseAdapter baseAdapter; //ListView適配器,用於提醒ListView數據已經更新 private LinkedList linkedList; public PullTask(PullToRefreshListView pullToRefreshListView, int pullState, BaseAdapter baseAdapter, LinkedList linkedList) { this.pullToRefreshListView = pullToRefreshListView; this.pullState = pullState; this.baseAdapter = baseAdapter; this.linkedList = linkedList; } @Override protected String doInBackground(Void... params) { try { Thread.sleep(1000); } catch (InterruptedException e) { } return StringTest; } @Override protected void onPostExecute(String result) { if(pullState == 1) {//name=pullDownFromTop value=0x1 下拉 linkedList.addFirst(頂部數據); } if(pullState == 2) {//name=pullUpFromBottom value=0x2 上拉 linkedList.addLast(底部數據); } baseAdapter.notifyDataSetChanged(); pullToRefreshListView.onRefreshComplete(); super.onPostExecute(result); } }
import java.util.LinkedList; import com.example.sampledemo.R; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; public class PullAdapter extends BaseAdapter { private LinkedListlinkedList; private LayoutInflater mInflater; public PullAdapter(LinkedList linkedList, Context context) { mInflater = LayoutInflater.from(context); this.linkedList = linkedList; } @Override public int getCount() { return linkedList.size(); } @Override public Object getItem(int position) { return linkedList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder=null; if (convertView == null) { holder = new ViewHolder(); convertView = mInflater.inflate(R.layout.layout_main_listitem, null); holder.textView = (TextView) convertView.findViewById(R.id.textView); convertView.setTag(holder); }else { holder = (ViewHolder) convertView.getTag(); } if(linkedList.size()>0){ final String dataStr = linkedList.get(position); holder.textView.setText(dataStr); } return convertView; } private static class ViewHolder { TextView textView; //數據顯示區域 } }
import java.util.Arrays; import java.util.LinkedList; import com.example.sampledemo.view.PullToRefreshBase.OnRefreshListener; import com.example.sampledemo.view.PullToRefreshListView; import com.example.sampledemo.view.adapter.PullAdapter; import com.example.sampledemo.view.task.PullTask; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.ListView; import android.app.Activity; /** * @ClassName MainActivity.java * @Author MaHaochen * @Date 2014-4-30 15:56:47 */ public class MainActivity extends Activity { private LinkedListmListItems; private PullToRefreshListView mPullRefreshListView; private ArrayAdapter mAdapter; private ListView mListView; private PullAdapter pullAdapter; private String[] mStrings = { 初始數據01,初始數據02,初始數據03,初始數據04,初始數據05 }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViews(); } private void initViews() { mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pullrefresh); mPullRefreshListView.setOnRefreshListener(mOnrefreshListener); mListView = mPullRefreshListView.getRefreshableView(); mListItems = new LinkedList (); mListItems.addAll(Arrays.asList(mStrings)); pullAdapter = new PullAdapter(mListItems, MainActivity.this); mListView.setAdapter(pullAdapter); } OnRefreshListener mOnrefreshListener = new OnRefreshListener() { public void onRefresh() { PullTask pullTask = new PullTask(mPullRefreshListView, mPullRefreshListView.getRefreshType(), pullAdapter, mListItems); pullTask.execute(); } }; }
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手機截屏是一項非常常用的功能,聊天時很多時候都需要用截屏來輔助表達,但華為榮耀7i手機截屏功能和很多手機的截屏方式是不一樣的,華為榮耀7i怎麼截圖呢?下面安
版本:1.0日期:2014.5.17 2014.6.1版權:© 2014 kince 轉載注明出處 在介紹SwitchButton之前,先來看一下系統Butt
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