刷新ListView與SwipeRefreshLayout

嘿我正在開發一個AudioRecorder應用程序（即時通訊新的Android開發）。一個「標籤」是記錄文件，另一個是播放它。問題是列表的適配器在Activity開始時捕獲數據，而不是在記錄之後捕獲數據。所以我試着讓Swiperefreshlayout刷新onRefresh（）方法中的數據。但我沒有得到它的工作！我認爲問題是由此引起的刷新ListView與SwipeRefreshLayout

for (String file:list){ 
     if (file.endsWith(".3pg")){ 
      values.add(file); 
      adapter.notifyDataSetChanged(); 
     } 
    }

in onRefresh（）。

FragmentAllRecords.java：

package com.julian.recorder; 


import android.app.LauncherActivity; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.os.CountDownTimer; 
import android.os.Environment; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.ListFragment; 
import android.support.v4.widget.SwipeRefreshLayout; 
import android.support.v7.widget.CardView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.ProgressBar; 
import android.widget.Toast; 

import java.io.File; 
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.List; 
import java.util.zip.Inflater; 


/** 
* A simple {@link Fragment} subclass. 
*/ 
public class FragmentAllRecords extends ListFragment implements SwipeRefreshLayout.OnRefreshListener { 
    private String path; 
    private SwipeRefreshLayout mSwipeLayout; 
    private String musicURI; 
    private MediaPlayer mp; 
    private CardView mMediaCard; 
    private ProgressBar mMediaProgress; 
    private ArrayAdapter<String> adapter; 
    private ArrayList<String> values; 
    private String[] list; 




    public FragmentAllRecords() { 
     // Required empty public constructor 
    } 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View p= inflater.inflate(R.layout.fragment_fragment_all_records, container, false); 
     mSwipeLayout=(SwipeRefreshLayout)p.findViewById(R.id.swipelayout); 
     mSwipeLayout.setOnRefreshListener(this); 



     mMediaCard=(CardView)p.findViewById(R.id.mediaCard); 
     mMediaCard.setVisibility(View.GONE); 

     mp=new MediaPlayer(); 



     // Use the current directory as title 
     path = Environment.getExternalStorageDirectory() 
     +File.separator 
     +Environment.DIRECTORY_MUSIC 
     +File.separator; 
     if (getActivity().getIntent().hasExtra("path")) { 
      path = getActivity().getIntent().getStringExtra("path"); 
     } 

     // Read all files sorted into the values-array 
     values = new ArrayList<String>(); 
     File dir = new File(path); 
     list = dir.list(); 
     if (list != null) { 
      for (String file : list) { 
       if (!file.endsWith(".3pg")) { 
        values.add(file); 


       } 
      } 
     } 
     Collections.sort(values); 

     // Put the data into the list 
     adapter = new ArrayAdapter<String>(getActivity(), 
       R.layout.recording_list_item, R.id.listText, values); 
     setListAdapter(adapter); 





     return p; 
    } 



    @Override 
    public void onListItemClick(ListView l, View v, int position, long id) { 
     mMediaCard.setVisibility(View.VISIBLE); 
     int duration=mp.getDuration(); 
     int currposition=mp.getCurrentPosition(); 





     musicURI=path 
       +values.get(position); 

     mp.getDuration(); 
     try { 
      mp.setDataSource(musicURI); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     try { 
      mp.prepare(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     mp.start(); 


    } 


    @Override 
    public void onRefresh() { 
     values.clear(); 
     adapter.notifyDataSetChanged(); 

     for (String file:list){ 
      if (file.endsWith(".3pg")){ 
       values.add(file); 
       adapter.notifyDataSetChanged(); 
      } 
     } 

     mSwipeLayout.setRefreshing(false); 
    } 


}

fragment_fragment_all_records.xml：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" 
android:layout_height="match_parent" tools:context="com.julian.recorder.FragmentAllRecords"> 

<android.support.v4.widget.SwipeRefreshLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/swipelayout"> 

    <ListView android:id="@android:id/list" android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 

    </android.support.v4.widget.SwipeRefreshLayout> 

<android.support.v7.widget.CardView 
    android:layout_width="match_parent" 
    android:layout_height="72dp" 
    android:layout_gravity="bottom" 
    android:visibility="visible" 
    android:elevation="20dp" 
    android:id="@+id/mediaCard"> 



    <Button 
     android:layout_width="56dp" 
     android:layout_height="56dp" 
     android:layout_gravity="center" 
     android:id="@+id/mStop" 
     android:src="@drawable/pause_circle" 
     android:background="@drawable/pause_circle" 

     android:visibility="visible"/> 

    <Button 
     android:layout_width="56dp" 
     android:layout_height="56dp" 
     android:layout_gravity="center" 
     android:id="@+id/mResume" 
     android:visibility="gone" 
     android:background="@drawable/play_circle"/> 

    <Button 
     android:layout_width="36dp" 
     android:background="@drawable/skip_next" 
     android:layout_height="36dp" 
     android:layout_gravity="center" 
     android:layout_marginLeft="64dp" 
     android:id="@+id/mNext" /> 

    <Button 
     android:layout_width="36dp" 
     android:layout_height="36dp" 
     android:layout_gravity="center" 
     android:id="@+id/mPrevious" 
     android:layout_marginRight="64dp" 
     android:background="@drawable/skip_previous"/> 


    </android.support.v7.widget.CardView>

（也許這是必要的，也是不知道...）Mainactivity.java：（我叫它RecordingActivity）

package com.julian.recorder; 

import android.app.Activity; 
import android.content.Context; 
import android.media.MediaRecorder; 
import android.net.Uri; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.ActionBarActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.AdapterView; 
import android.view.View; 
import android.widget.Button; 
import android.support.v4.view.PagerAdapter; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.media.AudioRecord; 
import android.widget.Toast; 
import android.widget.ArrayAdapter; 
import android.app.ListActivity; 
import android.support.v4.app.FragmentStatePagerAdapter; 

import com.getbase.floatingactionbutton.FloatingActionButton; 
import com.getbase.floatingactionbutton.FloatingActionsMenu; 
import com.getbase.floatingactionbutton.AddFloatingActionButton; 

import java.io.IOException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import java.util.Locale; 

import it.neokree.materialtabs.MaterialTab; 
import it.neokree.materialtabs.MaterialTabHost; 
import it.neokree.materialtabs.MaterialTabListener; 


public class RecordingActivity extends ActionBarActivity implements MaterialTabListener{ 

    private Toolbar toolbar; 

    MaterialTabHost tabHost; 
    ViewPager pager; 
    ViewPagerAdapter pagerAdapter; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_recording); 
     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 


     tabHost = (MaterialTabHost) this.findViewById(R.id.tabHost); 
     pager = (ViewPager) this.findViewById(R.id.pager); 
     pagerAdapter = new ViewPagerAdapter(getSupportFragmentManager()); 
     pager.setAdapter(pagerAdapter); 



     pager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { 
      @Override 
      public void onPageSelected(int position) { 
       tabHost.setSelectedNavigationItem(position); 
      } 
     }); 

     for (int i = 0; i < pagerAdapter.getCount(); i++) { 
      tabHost.addTab(
        tabHost.newTab() 
          .setText(pagerAdapter.getPageTitle(i)) 
          .setTabListener(this) 
      ); 
     } 






    } 



    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_recording, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 



     return super.onOptionsItemSelected(item); 
    } 


    @Override 
    public void onTabSelected(MaterialTab materialTab) { 
     pager.setCurrentItem(materialTab.getPosition()); 
    } 

    @Override 
    public void onTabReselected(MaterialTab materialTab) { 

    } 

    @Override 
    public void onTabUnselected(MaterialTab materialTab) { 

    } 





}

來源

2015-04-03 Julian Os

你檢查過刷新方法嗎？我正在談論像System.out.println（「onRefresh方法叫」）;在onRefresh（）方法中。 – 2015-04-03 11:20:37

是的，例如敬酒正在工作。 values.clear（）也可以工作！ – 2015-04-03 11:30:06

好的。你會得到類似錯誤的東西，還是隻是沒有顯示在列表中？ – 2015-04-03 12:06:45

我認爲你在給file.endsWith（「.3pg」）文件擴展名時犯了一個錯誤，它應該是「.3gp」，它是你生成的音頻文件的正確擴展名。

來源

2015-04-03 12:47:57

這會帶回文件但不是我之前錄製的文件...它只會再次捕獲舊文件... – 2015-04-03 14:26:50

好吧，我找到了解決方案。在onrefresh中，我重新定義了「dir」爲「dir2」，它具有相同的路徑。所以list就是list = dir2.list（）; 現在，它的工作！我認爲這個活動將獲取的文件保存在緩存或其他內容中，並只添加那些文件。現在用新的名字，它真的從存儲中取回它們！

來源

2015-04-03 14:42:40

您誤解了問題的解決方案。您需要在onRefresh()中再次致電dir.list()。類似下面：

@Override 
public void onRefresh() { 
    values.clear(); 
    File dir = new File(path); 
    list = dir.list(); 
    for (String file:list){ 
     if (file.endsWith(".3pg")){ 
      values.add(file); 
     } 
    } 
    adapter.notifyDataSetChanged(); 
    mSwipeLayout.setRefreshing(false); 
}

您需要在onRefresh()再次調用File.list()，也就是實際的刷新。你懷疑這裏沒有緩存。 list的內容將保持不變，直到您再次刷新它們。我還修復了notifyDataSetChanged()的不正確呼叫。

來源

2015-04-29 20:44:12 nhasan

刷新ListView與SwipeRefreshLayout

回答

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