java - 使用 SwipeRefreshLayout 刷新 ListView

Question

嘿，我正在开发一个 AudioRecorder 应用程序(我是 Android 开发的新手)。一个“Tab”用于录制文件，另一个用于播放文件。问题是列表的适配器在 Activity 开始时捕获数据，而不是在记录之后。所以我在onRefresh()方法中尝试让Swiperefreshlayout刷新数据。但我不让它工作!我觉得问题出在这里

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

在 onRefresh() 中。

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>

(也许这也是需要的。不知道...)Mainactivity.java:(我称之为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) {

    }





}

Answer 1

我认为您错误地在 file.endsWith(".3pg") 处提供了文件扩展名，它应该是“.3gp”，这是您生成的音频文件的正确扩展名。